CN111853310B - Pilot-operated dynamic pressure difference balance valve - Google Patents
Pilot-operated dynamic pressure difference balance valve Download PDFInfo
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- CN111853310B CN111853310B CN202010844495.1A CN202010844495A CN111853310B CN 111853310 B CN111853310 B CN 111853310B CN 202010844495 A CN202010844495 A CN 202010844495A CN 111853310 B CN111853310 B CN 111853310B
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- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 4
- 238000002788 crimping Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 15
- 230000001276 controlling effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a pilot type dynamic differential pressure balance valve, which comprises a main valve assembly and a pilot valve assembly, wherein the main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic piece and a main valve core, a main valve inlet is connected with the rear end of a load system, a main valve port is arranged between a main valve outlet and the main valve inlet, the main valve piston divides an inner cavity of the main valve piston cylinder into a main valve upper cavity and a main valve lower cavity, the main valve lower cavity is communicated with the main valve outlet, the pilot valve assembly comprises a pilot valve body, a pilot valve cover, a pilot piston, a closure cover, a closure retainer ring, a pilot elastic piece and an adjusting shaft, the pilot piston divides the inner cavity of the pilot valve body into a pilot valve upper cavity and a pilot valve lower cavity, the pilot valve upper cavity is communicated with the main valve inlet in a sealing way, and the pilot valve lower cavity is communicated with the front end of the load system in a sealing way. The pilot valve of the pilot type dynamic pressure difference balance valve is small in size and easy to install and detach, improves control precision and enables pressure difference of a system to be more stable.
Description
Technical Field
The present invention relates to dynamic pressure difference balancing valves, and more particularly, to a pilot dynamic pressure difference balancing valve.
Background
In central heating and cooling systems, dynamic pressure differential balancing valves are typically installed to maintain a constant pressure differential between two points of the water system piping. The dynamic pressure difference balance valve generally adopts a direct-acting diaphragm regulation mode, the pressures in front and behind the controlled system are respectively transmitted to the two sides of the pressure sensing diaphragm, and when the pressure difference in front and behind the controlled system changes, the pressure difference is fed back to the pressure sensing diaphragm and directly drives the valve core to move, so that the opening of the valve is changed. The differential pressure is increased, the valve core is closed, otherwise, the differential pressure is reduced, and the valve core is opened, so that the differential pressure of the controlled system is kept unchanged. The existing dynamic pressure difference balance valve has large general volume, particularly the diaphragm part occupies large space, which causes inconvenient installation, maintenance and replacement; and the control of the differential pressure is not accurate enough, and the differential pressure control performance is not ideal enough.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and the invention aims to provide a pilot type dynamic differential pressure balance valve which has the advantages of reduced overall volume and height, small pilot valve volume and easy installation and disassembly, and effectively improves the control precision by adopting a pilot valve to control a main valve in differential pressure control, so that the pressure difference of a system is more stable.
The invention relates to a pilot-type dynamic differential pressure balance valve, which comprises a main valve assembly and a pilot valve assembly, wherein the main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic piece and a main valve core, the left side and the right side of the main valve body are respectively provided with a main valve outlet and a main valve inlet, the main valve inlet is connected with the rear end of a load system, a main valve port is arranged between the main valve outlet and the main valve inlet, the main valve upper cover is detachably and hermetically fixed on the upper part of the main valve body, the main valve piston cylinder is hermetically and fixedly connected in the upper part of the main valve body through the main valve upper cover, the main valve piston is axially and reciprocally movably arranged in the main valve piston cylinder, the outer wall of the main valve piston is hermetically and slidably abutted against the inner wall of the main valve piston cylinder, the main valve piston sequentially separates the inner cavity of the main valve piston cylinder into a main valve upper cavity and a main valve lower cavity from top to bottom, the main valve elastic piece is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic piece are respectively propped against the lower surface of the main valve piston and the bottom of the main valve piston cylinder, the main valve lower cavity is communicated with the main valve outlet, the upper part of the main valve core is arranged at the bottom of the main valve piston cylinder in a penetrating way in an axial reciprocating way, the upper end of the main valve core is detachably and fixedly connected with the lower part of the main valve piston, the bottom of the main valve core is propped against the main valve opening in a releasable way, the main valve inlet is communicated with the main valve outlet in an openable way through the main valve opening, the pilot valve assembly comprises a pilot valve body, a pilot valve cover, a pilot piston, a closure cover, a closure check ring, a pilot elastic piece and an adjusting shaft, the pilot valve cover is detachably and tightly fixed at the bottom of the pilot valve body, the center of the pilot valve cover is provided with a through pilot valve outlet which is communicated with the main valve upper cavity, the pilot piston and the closure cover are respectively arranged in the pilot valve body in a reciprocating manner along the axial direction, the outer wall of the pilot piston is in sealed sliding contact with the inner wall of the pilot valve body, the inner cavity of the pilot valve body is sequentially divided into a pilot valve upper cavity and a pilot valve lower cavity from top to bottom by the pilot piston, the pilot valve upper cavity is in sealed communication with the main valve inlet, the pilot valve lower cavity is in sealed communication with the front end of the load system, the regulating shaft is arranged at the top of the pilot valve body in a reciprocating manner along the axial seal, the pilot elastic piece is arranged in the pilot valve upper cavity, the upper end and the lower end of the pilot elastic piece are respectively propped against the lower end of the adjusting shaft and the upper surface of the pilot piston, the lower surface of the pilot piston is fixedly connected with the upper end of the shutoff cover, a shutoff hole is formed in the outer wall of the lower part of the shutoff cover, the shutoff check ring is arranged in the lower cavity of the pilot valve, the outer wall of the shutoff check ring is fixedly connected with the inner wall of the lower part of the pilot valve body in a sealing manner, the lower part of the shutoff cover is arranged in the shutoff check ring in a penetrating manner in a reciprocating manner along the axial direction, the outer wall of the shutoff cover is propped against the inner wall of the shutoff check ring in a sealing sliding manner, and the lower cavity of the pilot valve is communicated with the upper cavity of the main valve in an openable and closable manner through the shutoff cover and the shutoff check ring.
The pilot-operated dynamic differential pressure balance valve of the invention can also be:
the aperture of the intercepting hole gradually increases from top to bottom along the axial direction.
The lower extreme of regulating axle is equipped with the spring holder, the upper portion of spring holder with the lower extreme of regulating axle offsets, the lower surface of spring holder with the upper end of guide elastic component offsets.
The main valve elastic piece is a main valve spring, the main valve spring is sleeved on the upper part of the main valve core, the upper end of the main valve spring is propped against the lower surface of the main valve piston, and the lower end of the main valve spring is propped against the bottom of the main valve piston cylinder.
The main valve assembly comprises a closing shaft for closing the main valve assembly, the closing shaft is arranged in the main valve upper cover in a penetrating mode in a reciprocating mode along the axial sealing mode, the lower end of the closing shaft is arranged in the main valve upper cavity in a penetrating mode, and the lower end of the closing shaft is in releasable abutting connection with the upper surface of the main valve piston.
The outer wall of the lower part of the pilot valve body is provided with a first pressure guiding port communicated with the pilot valve lower cavity, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guiding port.
The outer wall of the upper part of the pilot valve body is provided with a second pressure guiding port communicated with the upper cavity of the pilot valve, the outer wall of the main valve body, which is close to one side of the main valve inlet, is provided with a third pressure guiding port communicated with the main valve inlet, and the second pressure guiding port is communicated with the third pressure guiding port in a sealing way.
And the main valve piston is provided with a damping hole which is communicated with the main valve lower cavity through the damping hole.
The pilot valve assembly comprises an adjusting hand wheel used for driving the adjusting shaft to axially reciprocate, and the lower part of the adjusting hand wheel is in threaded connection with the upper part of the adjusting shaft.
The outer wall of the main valve body, which is close to one side of the main valve outlet, is provided with a pressure taking port for testing the outlet pressure of the main valve assembly, and the pressure taking port is communicated with the main valve outlet.
The application relates to a pilot-type dynamic differential pressure balance valve, which comprises a main valve assembly and a pilot valve assembly, wherein the main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic element and a main valve core, the left side and the right side of the main valve body are respectively provided with a main valve outlet and a main valve inlet, the main valve inlet is connected with the rear end of a load system, a main valve port is arranged between the main valve outlet and the main valve inlet, the main valve upper cover is detachably and hermetically fixed on the upper part of the main valve body, the main valve piston cylinder is hermetically and fixedly connected in the upper part of the main valve body through the main valve upper cover, the main valve piston is axially and reciprocally movably arranged in the main valve piston cylinder, The outer wall of the main valve piston is in sliding contact with the inner wall of the main valve piston cylinder, the inner cavity of the main valve piston cylinder is divided into a main valve upper cavity and a main valve lower cavity by the main valve piston from top to bottom in sequence, the main valve elastic piece is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic piece are respectively in contact with the lower surface of the main valve piston and the bottom of the main valve piston cylinder, the main valve lower cavity is communicated with the main valve outlet, the upper part of the main valve core is arranged at the bottom of the main valve piston cylinder in a penetrating way in an axial reciprocating way, the upper end of the main valve core is detachably and fixedly connected with the lower part of the main valve piston, the bottom of the main valve core is in releasable contact with the main valve opening, The main valve inlet is communicated with the main valve outlet in an openable and closable way through the main valve opening, the pilot valve assembly comprises a pilot valve body, a pilot valve cover, a pilot piston, a closure cover, a closure retainer ring, a pilot elastic piece and an adjusting shaft, the pilot valve cover is detachably sealed and fixed at the bottom of the pilot valve body, a through pilot valve outlet is arranged in the center of the pilot valve cover, the pilot valve outlet is communicated with the main valve upper cavity, the pilot piston and the closure cover are respectively arranged in the pilot valve body in a reciprocating way along the axial direction, the outer wall of the pilot piston is in sealed sliding contact with the inner wall of the pilot valve body, the pilot piston sequentially separates the inner cavity of the pilot valve body into a pilot valve upper cavity and a pilot valve lower cavity from top to bottom, The upper cavity of the pilot valve is communicated with the inlet of the main valve in a sealing way, the lower cavity of the pilot valve is communicated with the front end of the load system in a sealing way, the regulating shaft is arranged at the top of the pilot valve body in a penetrating way along the axial sealing way in a reciprocating way, the pilot elastic piece is arranged in the upper cavity of the pilot valve, the upper end and the lower end of the pilot elastic piece are respectively propped against the lower end of the regulating shaft and the upper surface of the pilot piston, the lower surface of the pilot piston is fixedly connected with the upper end of the closure cover, the outer wall of the lower part of the closure cover is provided with a closure hole, the closure retainer ring is arranged in the lower cavity of the pilot valve, the outer wall of the closure retainer ring is fixedly connected with the inner wall of the lower part of the pilot valve body in a sealing way, the lower part of the closure cover can axially reciprocate and penetrate through the closure check ring, the outer wall of the closure cover and the inner wall of the closure check ring are in sealed sliding propping-against, and the pilot valve lower cavity is in openable and closable communication with the main valve upper cavity through the closure cover and the closure check ring. thus, the dynamic differential pressure balance valve of the application comprises a main valve component and a pilot valve component which are of piston structures, the pilot valve component comprises a pilot valve cover, a pilot valve body, a pilot piston, a closure cover, a closure check ring, an adjusting shaft and the like, the front end of a load system is communicated with a pilot valve lower cavity, the pressure of the front end of the load system is transmitted to the pilot valve lower cavity, the closure cover is provided with the closure hole, the closure check ring is fixed, liquid from the front end of the load system passes through the closure hole to enter the closure cover and then reaches a pilot valve outlet, the closure cover is arranged at different positions, the closure check ring has different areas for blocking the closure hole, the control of the flow area of the closure cover can be realized, Thereby better controlling the opening degree of the pilot valve assembly; The main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve core and the like, wherein the main valve upper cavity is communicated with the pilot valve outlet, and specifically, a communication hole can be formed in the main valve upper cover and used for communicating the main valve upper cavity with the pilot valve outlet, and a main valve inlet is communicated with the pilot valve upper cavity, namely, the pressure at the rear end of the load system is transferred to the pilot valve upper cavity. When the valve set value is unchanged and is in a stable working state, the closure cover and the main valve core are respectively in a certain opening position, fluid with the pressure P1 at the front end of the load system enters the lower cavity of the pilot valve and upwards extrudes the lower surface of the pilot valve piston, then enters the upper cavity of the main valve through the outlet of the pilot valve and downwards extrudes the upper surface of the main valve piston, the fluid with the pressure P2 at the rear end of the load system reaches the main valve inlet and then is divided into two paths, one path enters the upper cavity of the pilot valve and downwards extrudes the upper surface of the pilot valve piston, at the moment, the fluid pressure at the upper side and the lower side of the pilot valve piston and the elastic force of the pilot elastic piece reach balance, the other path flows through the main valve inlet and then reaches the main valve outlet, at this time, the main valve piston is balanced under the action of fluid pressure and elastic force at two sides. When the valve set value is unchanged and the pressure difference delta P (=P1-P2) at the two ends of the load system is increased, the pressure difference of the fluid at the two sides of the pilot piston is larger than the elastic force of the pilot elastic piece, the pilot piston moves upwards to enlarge the flow area of the closure cover, so that the pressure of the upper cavity of the main valve is increased, the main valve piston moves downwards under the thrust action of the fluid in the upper cavity of the main valve, the opening of the main valve core is reduced, the pressure P2 at the rear end of the load system is increased, and finally delta P is reduced to a set value. When the valve set value is unchanged and the pressure difference delta P at the two ends of the load system is reduced, the pilot piston receives the pressure of fluid at the two sides, the pressure is smaller than the elasticity of the pilot elastic piece, the pilot elastic piece pushes the pilot piston to move downwards so as to reduce the flow area of the closure cover, the pressure of the upper cavity of the main valve is reduced, the main valve piston moves upwards under the thrust action of the main valve elastic piece, the opening of the main valve core is increased, the pressure P2 at the rear end of the load system is reduced, and finally delta P is increased to a set value. In addition, the pilot valve assembly is integrally arranged in a tilting mode from top to bottom from right to left, the main valve piston cylinder of the main valve assembly is arranged in a tilting mode from top to bottom from left to right, and the pilot valve assembly is detachably fixed on the main valve upper cover of the main valve assembly through a pilot valve cover, so that the structure is compact. Therefore, the change of the pressure difference of the load system is fed back to the pilot valve assembly, and the opening degree of the main valve assembly is controlled through the pilot valve assembly, so that the purpose of controlling the pressure difference of the load system is achieved, compared with the existing direct-acting diaphragm type dynamic pressure difference balance valve, the integral size of the valve is greatly reduced, the integral height of the valve is reduced, particularly, the pilot valve part is small in size and easy to install and detach, the mode of controlling the main valve by the pilot valve is adopted on pressure difference control, the control precision is effectively improved, and the pressure difference of the system is more stable. Compared with the prior art, the pilot type dynamic pressure difference balance valve has the following advantages: the whole volume and the height are reduced, the pilot valve is small in volume and easy to install and detach, and a pilot valve control main valve mode is adopted on differential pressure control, so that the control precision is effectively improved, and the pressure difference of the system is more stable.
Drawings
FIG. 1 is a schematic diagram of a pilot dynamic differential pressure balance valve according to the present invention.
FIG. 2 is a schematic view of section A-A of FIG. 1.
Description of the drawings
1 … Pilot valve body 2 … first pressure guiding port 3 … Pilot piston
4 … Pilot spring 5 … spring seat 6 … adjusting shaft
7 … Closure 8 … third pressure guide opening 9 … damping hole
10 … Main valve piston 11 … Main valve spring 12 … Main valve core
Main valve upper cover of main valve piston cylinder 14 … main valve body 15 … main valve 13 …
16 … Pilot valve cover 17 … pressure taking port 18 … closing shaft
19 … Communication hole 20 … pilot valve assembly 21 … main valve assembly
22 … Second pressure guiding port 23 … main valve guiding port 24 … closure check ring
25 … Hand wheel 26 … flow blocking hole 27 … main valve inlet
28 … Main valve outlet 29 pilot valve outlet 29 …
Detailed Description
In the present invention, if directions (up, down, left, right, inner and outer) are described with reference to the structure shown in fig. 2, the actual use direction of the present invention is not limited thereto. Wherein the pilot valve assembly 20 is up and the main valve assembly 21 is down; the outlet of the main valve is at the left, the inlet of the main valve is at the right; the pilot piston 2 is inside and the pilot valve body 1 is outside.
A pilot-operated dynamic differential pressure balance valve according to the present invention will be described in further detail with reference to fig. 1 to 2.
The application relates to a pilot-type dynamic differential pressure balance valve, referring to fig. 1-2, comprising a main valve assembly 21 and a pilot valve assembly 20, wherein the main valve assembly 21 comprises a main valve body 14, a main valve upper cover 15, a main valve piston cylinder 13, a main valve piston 10, a main valve elastic member and a main valve core 12, a main valve outlet 28 and a main valve inlet 27 are respectively arranged on the left side and the right side of the main valve body 14, the main valve inlet 27 is connected with the rear end of a load system, a main valve port is arranged between the main valve outlet 28 and the main valve inlet 27, the main valve upper cover 15 is detachably sealed and fixed on the upper part of the main valve body 14, the main valve piston cylinder 13 is sealed and pressed and fixed in the upper part of the main valve body 14 through the main valve upper cover 15, the main valve piston 10 is arranged in the main valve piston cylinder 13 in a reciprocating manner along the axial direction, the outer wall of the main valve piston 10 is in sealing sliding contact with the inner wall of the main valve piston cylinder 13, the main valve piston 10 sequentially divides the inner cavity of the main valve piston cylinder 13 into a main valve upper cavity and a main valve lower cavity from top to bottom, the main valve elastic piece is arranged in the main valve lower cavity, the upper end and the lower end of the main valve elastic piece are respectively in contact with the lower surface of the main valve piston 10 and the bottom of the main valve piston cylinder 13, the main valve lower cavity is communicated with the main valve outlet 28, the upper part of the main valve core 12 is arranged at the bottom of the main valve piston cylinder 13 in a penetrating manner along the axial direction in a reciprocating manner, The upper end of the main valve core 12 is detachably and fixedly connected with the lower part of the main valve piston 10, the bottom of the main valve core 12 is in releasable abutment with the main valve opening, the main valve inlet 27 is in openable and closable communication with the main valve outlet 28 through the main valve opening, the pilot valve assembly 20 comprises a pilot valve body 1, a pilot valve cover 16, a pilot piston 3, a closure cover 7, a closure retainer 24, a pilot elastic piece and an adjusting shaft 6, the pilot valve cover 16 is detachably and fixedly arranged at the bottom of the pilot valve body 1, a through pilot valve outlet 29 is arranged in the center of the pilot valve cover 16, the pilot valve outlet 29 is communicated with the main valve upper cavity, The pilot piston 3 and the closure cover 7 are respectively arranged in the pilot valve body 1 in a reciprocating manner along the axial direction, the outer wall of the pilot piston 3 is in sliding contact with the inner wall of the pilot valve body 1 in a sealing manner, the pilot piston 3 sequentially divides the inner cavity of the pilot valve body 1 into a pilot valve upper cavity and a pilot valve lower cavity from top to bottom, the pilot valve upper cavity is in sealing communication with the main valve inlet 27, the pilot valve lower cavity is in sealing communication with the front end of a load system, the regulating shaft 6 is arranged at the top of the pilot valve body 1 in a reciprocating manner along the axial direction in a sealing manner, the pilot elastic piece is arranged in the pilot valve upper cavity, the upper end and the lower end of the pilot elastic piece are respectively in contact with the lower end of the regulating shaft 6 and the upper surface of the pilot piston 3, The lower surface of the pilot piston 3 is fixedly connected with the upper end of the shutoff cover 7, a shutoff hole 26 is formed in the outer wall of the lower portion of the shutoff cover 7, the shutoff retainer 24 is arranged in the pilot valve lower cavity, the outer wall of the shutoff retainer 24 is fixedly connected with the inner wall of the lower portion of the pilot valve body 1 in a sealing mode, the lower portion of the shutoff cover 7 is arranged in the shutoff retainer 24 in a penetrating mode in a reciprocating mode along the axial direction, the outer wall of the shutoff cover 7 is in sliding contact with the inner wall of the shutoff retainer 24 in a sealing mode, and the pilot valve lower cavity is communicated with the main valve upper cavity in an opening and closing mode through the shutoff cover 7 and the shutoff retainer 24. Thus, the dynamic differential pressure balance valve of the application comprises a main valve component 21 and a pilot valve component 20, the main valve component 21 and the pilot valve component 20 are of a piston type structure, the pilot valve component 20 comprises a pilot valve cover 16, a pilot valve body 1, a pilot piston 3, a closure cover 7, a closure check ring 24, an adjusting shaft 6 and the like, the front end of a load system is communicated with a pilot valve lower cavity, the pressure of the front end of the load system is transferred to the pilot valve lower cavity, the closure cover 7 is provided with a closure hole 26, the closure check ring 24 is fixed, liquid from the front end of the load system passes through the closure hole 26 to enter the closure cover 7 and then reaches a pilot valve outlet 29, the closure cover 7 is arranged at different positions, The area of the interception check ring 24 for blocking the interception hole 26 is different, so that the flow area of the interception cover 7 can be controlled, and the opening degree of the pilot valve assembly 20 can be controlled better; the main valve assembly 21 comprises a main valve body 14, a main valve upper cover 15, a main valve piston cylinder 13, a main valve piston 10, a main valve core 12 and the like, wherein a main valve upper cavity is communicated with a pilot valve outlet 29, specifically, a communication hole 19 can be formed in the main valve upper cover 15 and used for communicating the main valve upper cavity with the pilot valve outlet 29, a main valve inlet 27 is communicated with the pilot valve upper cavity, and the pressure at the rear end of the load system is transmitted to the pilot valve upper cavity. When the valve set value is unchanged and is in a stable working state, the closure cover 7 and the main valve core 12 are respectively in a certain opening position, fluid with the pressure P1 at the front end of the load system enters the lower cavity of the pilot valve, upwards extrudes the lower surface of the pilot valve piston, enters the upper cavity of the main valve through the pilot valve outlet 29, downwards extrudes the upper surface of the main valve piston 10, the fluid with the pressure P2 at the rear end of the load system reaches the main valve inlet 27 and then is divided into two paths, one path enters the upper cavity of the pilot valve and downwards extrudes the upper surface of the pilot piston 3, at the moment, the fluid pressure at the upper side and the lower side of the pilot piston 3 is balanced under the action of the elastic force of the pilot elastic piece, the other path flows through the main valve inlet 27 to the main valve outlet 28, The main valve piston 10 now reaches equilibrium under the action of fluid pressure and elastic force on both sides. When the valve set value is unchanged and the pressure difference delta P (=P1-P2) at the two ends of the load system is increased, the pressure difference of the fluid at the two sides of the pilot piston 3 is larger than the elastic force of the pilot elastic piece, the pilot piston 3 moves upwards to enlarge the flow area of the closure cover 7, so that the pressure of the upper cavity of the main valve is increased, the main valve piston 10 moves downwards under the thrust action of the fluid in the upper cavity of the main valve, the opening of the main valve core 12 is reduced, the pressure P2 at the rear end of the load system is increased, and finally delta P is reduced to a set value. When the valve set value is unchanged and the pressure difference delta P at the two ends of the load system is reduced, the pilot piston 3 receives the pressure of fluid at the two sides, which is smaller than the elasticity of the pilot elastic piece, the pilot elastic piece pushes the pilot piston 3 to move downwards so as to reduce the flow area of the closure cover 7, the pressure of the upper cavity of the main valve is reduced, the main valve piston 10 moves upwards under the thrust action of the main valve elastic piece, the opening of the main valve core 12 is increased, the pressure P2 at the rear end of the load system is reduced, and finally delta P is increased to a set value. In addition, the pilot valve assembly 20 is arranged obliquely from top to bottom from right to left, the main valve piston cylinder 13 of the main valve assembly 21 is arranged obliquely from top to bottom from left to right, and the pilot valve assembly 20 is detachably fixed on the main valve upper cover 15 of the main valve assembly 21 through the pilot valve cover 16, so that the structure is compact. Therefore, the change of the pressure difference of the load system is fed back to the pilot valve assembly 20, and then the opening degree of the main valve assembly 21 is controlled through the pilot valve assembly 20, so that the purpose of controlling the pressure difference of the load system is achieved, compared with the current direct-acting diaphragm type dynamic pressure difference balance valve, the integral size of the valve is greatly reduced, the integral height of the valve is reduced, particularly the pilot valve part is small in size and easy to install and detach, the mode of controlling the main valve by the pilot valve is adopted on pressure difference control, the control precision is effectively improved, and the pressure difference of the system is more stable. compared with the prior art, the pilot type dynamic pressure difference balance valve has the following advantages: the whole volume and the height are reduced, the pilot valve body 1 is small in volume and easy to install and detach, and a pilot valve control main valve mode is adopted on differential pressure control, so that the control precision is effectively improved, and the system differential pressure is more stable.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the aperture of the intercepting hole gradually increases from top to bottom along the axial direction. Thus, when the closure cover moves up and down, the change of the flow area is obvious, and the control effect is good.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the lower extreme of regulating shaft 6 is equipped with spring holder 5, the upper portion of spring holder 5 with the lower extreme of regulating shaft 6 offsets, the lower surface of spring holder 5 with the upper end of guide elastic component offsets. Thus, the lower end of the adjusting shaft 6 is provided with a pilot spring 4 seat for mounting a pilot spring element, and in addition, the pilot spring element can adopt a pilot spring 4 for providing elasticity for the pilot piston 2.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the main valve elastic piece is a main valve spring 11, the main valve spring 11 is sleeved on the upper portion of the main valve core 12, the upper end of the main valve spring 11 abuts against the lower surface of the main valve piston 10, and the lower end of the main valve spring 11 abuts against the bottom of the main valve piston cylinder 13. Thus, the main valve spring 11 provides elasticity for the main valve piston 10, the main valve spring 11 is sleeved on the main valve core 12, the arrangement is reasonable, and the main valve spring 11 is stably installed.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the main valve assembly 21 comprises a closing shaft 18 for closing the main valve assembly 21, the closing shaft 18 is arranged in the main valve upper cover 15 in a penetrating manner in an axial sealing manner in a reciprocating manner, the lower end of the closing shaft 18 is arranged in the main valve upper cavity in a penetrating manner, and the lower end of the closing shaft 18 is in releasable abutting contact with the upper surface of the main valve piston 10. In this way, the valve can be closed by rotating the closing shaft 18. Specifically, the closing shaft 18 can be rotated clockwise by using an internal hexagonal wrench, the closing shaft 18 moves downwards and contacts with the main valve piston 10, the main valve piston 10 and the valve core move downwards under the pushing of the closing shaft 18 until the valve is closed; when the off function is not needed, the closing shaft 18 is rotated counterclockwise to the home position.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the outer wall of the lower part of the pilot valve body 1 is provided with a first pressure guiding port 2 communicated with the pilot valve lower cavity, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guiding port 2. Thus, the lower part of the pilot valve body 1 is provided with the first pressure guiding port 2 for realizing the communication between the lower cavity of the pilot valve and the front end of the load system, and specifically, the first pressure guiding port 2 can be connected to the front end of the load through a pressure guiding pipe.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the outer wall of the upper part of the pilot valve body 1 is provided with a second pressure guiding port 22 communicated with the pilot valve upper cavity, the outer wall of the main valve body 14, which is close to one side of the main valve inlet 27, is provided with a third pressure guiding port 8 communicated with the main valve inlet 27, and the second pressure guiding port 22 is communicated with the third pressure guiding port 8 in a sealing way. In this way, the pilot valve body 1 and the main valve body 14 are respectively provided with the second pressure guiding port 22 and the third pressure guiding port 8, so as to realize communication between the main valve inlet 27 and the pilot valve upper cavity, i.e. the pressure P2 at the rear end of the load system reaches the pilot valve upper cavity through the second pressure guiding port 22. The second pressure guiding port 22 and the third pressure guiding port 8 can be in sealing communication through a pressure guiding pipe.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the main valve piston 10 is provided with a damping hole 9 which is penetrated along the axial direction, and the main valve upper cavity is communicated with the main valve lower cavity through the damping hole 9. Thus, the main valve piston 10 is provided with the damping hole 9 for reducing the pressure of the fluid, so as to improve the working stability of the main valve piston 10.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the pilot valve assembly 20 comprises an adjusting hand wheel 25 for driving the adjusting shaft 6 to reciprocate along the axial direction, and the lower part of the adjusting hand wheel 25 is in threaded connection with the upper part of the adjusting shaft 6. In this way, by rotating the adjusting handwheel 25 to control the differential pressure set value, specifically, when the handwheel 25 is rotated clockwise, the adjusting shaft 6 moves downward, pushing the spring seat 5 to squeeze the pilot spring 4, the pilot piston 2 moves downward under the increase of the spring force, the flow area of the closure cap 7 decreases, causing the pressure of the upper cavity of the main valve to decrease, the main valve piston 10 moves upward, the opening of the main valve core 12 increases, resulting in the decrease of P2, and finally the differential pressure set value is improved. Conversely, rotating the hand wheel 25 counter-clockwise decreases the differential pressure set point.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the outer wall of the main valve body 14, which is close to the main valve outlet 28, is provided with a pressure taking port 17 for testing the outlet pressure of the main valve assembly 21, and the pressure taking port 17 is communicated with the main valve outlet 28. In this way, the pressure tap 17 is provided for testing the valve outlet pressure, i.e. the pressure at the main valve outlet 28.
On the basis of the technical scheme described above, please refer to fig. 1 to 2, the pilot type dynamic differential pressure balance valve of the present invention may further be: the bottom of the main valve piston cylinder 13 is provided with a main valve diversion port 23, and the main valve lower cavity is communicated with the main valve outlet 28 through the main valve diversion port 23. Thus, the bottom of the main valve cylinder 13 is provided with a main valve pilot port 23 to allow the main valve lower chamber to communicate with the main valve outlet 28.
The foregoing description of the embodiments of the present invention should not be taken as limiting the scope of the invention, but all equivalent changes or modifications according to the design spirit of the present invention should be considered as falling within the scope of the present invention.
Claims (8)
1. A pilot-operated dynamic differential pressure balance valve is characterized in that: comprises a main valve assembly and a pilot valve assembly,
The main valve assembly comprises a main valve body, a main valve upper cover, a main valve piston cylinder, a main valve piston, a main valve elastic element and a main valve core, wherein a main valve outlet and a main valve inlet are respectively formed in the left side and the right side of the main valve body, the main valve inlet is connected with the rear end of a load system, a main valve port is arranged between the main valve outlet and the main valve inlet, the main valve upper cover is detachably and hermetically fixed on the upper part of the main valve body, the main valve piston cylinder is fixedly arranged in the upper part of the main valve body through sealing crimping of the main valve upper cover, the main valve piston is axially and reciprocally movably arranged in the main valve piston cylinder, the outer wall of the main valve piston is in sealing sliding contact with the inner wall of the main valve piston cylinder, the main valve piston sequentially separates the inner cavity of the main valve piston cylinder into a main valve upper cavity and a main valve lower cavity from top to bottom, the main valve elastic element is arranged in the lower cavity, the upper end and the lower end of the main valve elastic element is respectively abutted against the lower surface of the main valve piston, the main valve lower cavity is communicated with the main valve piston, the main valve piston is axially movably arranged on the main valve piston core, the main valve piston is axially movably abutted against the main valve piston core, the main valve piston is axially movably connected with the main valve piston cylinder through the upper end and the main valve piston is movably and movably abutted with the main valve piston through the upper end,
The pilot valve assembly comprises a pilot valve body, a pilot valve cover, a pilot piston, a closure cap, a closure retainer ring, a pilot elastic member and an adjusting shaft, wherein the pilot valve cover is detachably sealed and fixed at the bottom of the pilot valve body, a through pilot valve outlet is formed in the center of the pilot valve cover and is communicated with the upper cavity of the pilot valve, the pilot piston and the closure cap are respectively arranged in the pilot valve body in a reciprocating manner along the axial direction, the outer wall of the pilot piston is in sealed sliding contact with the inner wall of the pilot valve body, the pilot piston sequentially separates an inner cavity of the pilot valve body from top to bottom into a pilot valve upper cavity and a pilot valve lower cavity, the pilot valve upper cavity is in sealed communication with the main valve inlet, the pilot valve lower cavity is in sealed communication with the front end of a load system, the adjusting shaft is arranged in the pilot valve upper cavity in a reciprocating manner along the axial direction, the upper end and the lower end of the pilot elastic member is respectively in contact with the lower end of the adjusting shaft and the upper surface of the pilot valve body, the lower end of the closure cap is in sliding contact with the upper surface of the closure cap, the closure cap is fixedly connected with the closure cap, and the closure cap is in sliding contact with the closure cap lower end of the closure cap, and the closure cap is in sliding contact with the closure cap;
the aperture of the intercepting hole gradually increases from top to bottom along the axial direction;
the lower extreme of regulating axle is equipped with the spring holder, the upper portion of spring holder with the lower extreme of regulating axle offsets, the lower surface of spring holder with the upper end of guide elastic component offsets.
2. The piloted dynamic pressure differential balancing valve of claim 1, wherein: the main valve elastic piece is a main valve spring, the main valve spring is sleeved on the upper part of the main valve core, the upper end of the main valve spring is propped against the lower surface of the main valve piston, and the lower end of the main valve spring is propped against the bottom of the main valve piston cylinder.
3. The piloted dynamic pressure differential balancing valve of claim 1, wherein: the main valve assembly comprises a closing shaft for closing the main valve assembly, the closing shaft is arranged in the main valve upper cover in a penetrating mode in a reciprocating mode along the axial sealing mode, the lower end of the closing shaft is arranged in the main valve upper cavity in a penetrating mode, and the lower end of the closing shaft is in releasable abutting connection with the upper surface of the main valve piston.
4. The piloted dynamic pressure differential balancing valve of claim 1, wherein: the outer wall of the lower part of the pilot valve body is provided with a first pressure guiding port communicated with the pilot valve lower cavity, and the pilot valve lower cavity is connected with the front end of the load system through the first pressure guiding port.
5. The piloted dynamic pressure differential balancing valve of claim 1, wherein: the outer wall of the upper part of the pilot valve body is provided with a second pressure guiding port communicated with the upper cavity of the pilot valve, the outer wall of the main valve body, which is close to one side of the main valve inlet, is provided with a third pressure guiding port communicated with the main valve inlet, and the second pressure guiding port is communicated with the third pressure guiding port in a sealing way.
6. A pilot operated dynamic pressure differential balancing valve according to any one of claims 1 to 4, wherein: and the main valve piston is provided with a damping hole which is communicated with the main valve lower cavity through the damping hole.
7. A pilot operated dynamic pressure differential balancing valve according to any one of claims 1 to 4, wherein: the pilot valve assembly comprises an adjusting hand wheel used for driving the adjusting shaft to axially reciprocate, and the lower part of the adjusting hand wheel is in threaded connection with the upper part of the adjusting shaft.
8. A pilot operated dynamic pressure differential balancing valve according to any one of claims 1 to 4, wherein: the outer wall of the main valve body, which is close to one side of the main valve outlet, is provided with a pressure taking port for testing the outlet pressure of the main valve assembly, and the pressure taking port is communicated with the main valve outlet.
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| CN202010844495.1A CN111853310B (en) | 2020-08-20 | 2020-08-20 | Pilot-operated dynamic pressure difference balance valve |
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| CN202010844495.1A CN111853310B (en) | 2020-08-20 | 2020-08-20 | Pilot-operated dynamic pressure difference balance valve |
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| CN111853310B true CN111853310B (en) | 2024-09-03 |
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| CN212273180U (en) * | 2020-08-20 | 2021-01-01 | 欧文托普（中国）暖通空调系统技术有限公司 | Pilot-operated type dynamic differential pressure balance valve |
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| CN1018082B (en) * | 1988-06-18 | 1992-09-02 | 石磊 | Directly pressure feed-back anti-pollution electric servo valve |
| JP3341198B2 (en) * | 1995-03-15 | 2002-11-05 | 株式会社テイエルブイ | Pilot type back pressure valve |
| JP2005233298A (en) * | 2004-02-19 | 2005-09-02 | Ckd Corp | Pilot valve and pneumatic cylinder |
| CN104864137B (en) * | 2015-05-20 | 2017-11-14 | 安徽理工大学 | Leading type water pressure overflow valve |
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| CN212273180U (en) * | 2020-08-20 | 2021-01-01 | 欧文托普（中国）暖通空调系统技术有限公司 | Pilot-operated type dynamic differential pressure balance valve |
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