CN109114272B - Self-operated internal valve beneficial to adjustment - Google Patents
Self-operated internal valve beneficial to adjustment Download PDFInfo
- Publication number
- CN109114272B CN109114272B CN201811172755.4A CN201811172755A CN109114272B CN 109114272 B CN109114272 B CN 109114272B CN 201811172755 A CN201811172755 A CN 201811172755A CN 109114272 B CN109114272 B CN 109114272B
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- cover
- membrane cover
- axial
- wave spring
- annular
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- 230000009286 beneficial effect Effects 0.000 title claims abstract description 9
- 239000012528 membrane Substances 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 12
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 230000009471 action Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a self-operated internal valve body which is beneficial to adjustment, comprising a valve body, a lower membrane cover and an upper membrane cover, wherein a membrane is arranged in the lower membrane cover; a wave spring is arranged in the upper film cover; an inner thread is arranged on the inner wall of the upper membrane cover, an annular adjusting sleeve is arranged at the axial top end of the wave spring along the circumferential outer edge, and an outer thread matched with the inner thread is arranged on the side wall of the axial outer edge of the annular adjusting sleeve; the axial bottom end of the wave spring is used for contacting with the diaphragm; the sealing cover plate is provided with a through hole, and a thread bush is arranged in the through hole; the pressure regulating valve further comprises a regulating screw rod, one axial end of the regulating screw rod penetrates through the through hole in a penetrating mode with the threaded sleeve in an adapting mode to extend into the upper membrane cover, a pressing plate is arranged at the end portion, extending into the upper membrane cover, of the regulating screw rod, a plurality of clamping teeth are arranged on the lower plate face of the pressing plate in a protruding mode, and clamping grooves matched with the clamping teeth are formed in the end face, facing the pressing plate, of the annular regulating sleeve. The invention increases the adjusting range of the output pressure of the valve by adjusting the wave spring component and has flexible adjustment.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a self-operated internal valve body which is beneficial to adjustment.
Background
The self-operated pressure regulating valve does not need external energy, can work in places without electricity and gas, and is convenient and saves energy. The pressure segmentation ranges are thin and mutually crossed, and the adjustment precision is high. The pressure set point may be continuously set during operation. And the rubber diaphragm type detection is performed, and the detection precision of the actuating mechanism is high and the action is sensitive. The pressure balance mechanism is adopted, so that the reaction of the regulating valve is sensitive and the control is accurate.
The existing spring film type internal pressure-taking self-operated valve introduces wave spring pre-pressing, replaces the traditional cylindrical spring, greatly reduces the total height of equipment, lightens weight, and more importantly, avoids a plurality of unreliable factors of the cylindrical spring, effectively prolongs the service life of the regulating valve, but has smaller regulating range of the output pressure of the valve by regulating the wave spring component.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a self-operated internal valve body which solves the problems and is beneficial to adjustment by adjusting a wave spring component to adjust the output pressure of the valve.
The invention is realized by the following technical scheme:
The self-operated internal valve body which is beneficial to adjustment comprises a valve body, a lower membrane cover and an upper membrane cover which are sequentially connected from bottom to top, wherein a membrane is arranged in the lower membrane cover close to the bottom end; a wave spring is arranged in the upper film cover; the axial one end of the valve rod is tightly pressed by the lower tray and the upper tray and is connected with the diaphragm, the diaphragm is positioned between the lower tray and the upper tray, and the axial other end of the valve rod stretches into the valve body; an inner thread is arranged on the inner wall of the upper membrane cover, an annular adjusting sleeve is arranged at the axial top end of the wave spring along the circumferential outer edge, and an outer thread matched with the inner thread is arranged on the side wall of the axial outer edge of the annular adjusting sleeve; the axial bottom end of the wave spring is used for contacting with the diaphragm;
The sealing cover plate is provided with a through hole, and a thread bush is arranged in the through hole; the pressure regulating valve further comprises an adjusting screw, one axial end of the adjusting screw penetrates through the through hole to extend into the upper membrane cover in a matching manner with the threaded sleeve, a pressing plate is arranged at the end, extending into the upper membrane cover, of the adjusting screw, a plurality of clamping teeth are convexly arranged on the lower plate surface of the pressing plate, and clamping grooves matched with the clamping teeth are formed in the end face, facing the pressing plate, of the annular adjusting sleeve.
The working principle of the invention is as follows: the wave springs are connected with the inner wall of the upper membrane cover through the annular adjusting sleeve in a threaded manner, so that a user can conveniently replace the wave springs with different types according to actual demands. Taking the working principle of valve back action as an example: the medium pressure P2 directly enters the lower membrane chamber and acts on the membrane to generate an upward thrust to drive the valve core to move upwards, and the valve moves towards the closing trend. The upper part of the diaphragm is provided with a wave spring, and the reaction force of the wave spring and the pressure on the diaphragm are balanced; p2 rises, the valve core trend moves upwards, the valve opening is reduced, the flow is reduced, and the P2 rising trend is weakened to a new balance point to form; otherwise, P2 is reduced, the valve core is pushed to move downwards by spring force, the opening degree of the valve is increased, the flow is increased, and P2 is increased. Therefore, the reaction force of the wave spring directly influences the pressure and flow of the output end of the invention. According to the invention, different types of wave springs can be selected according to actual demands, after the wave springs are selected, the wave springs are screwed into the upper membrane cover through the annular adjusting sleeve, and the wave springs can be continuously arranged at proper positions in the upper membrane cover through the rotary thread structure; in addition, through setting up the adjusting screw on the seal cover plate, the adjusting screw is threaded with threaded sleeve on the seal cover plate, can set up the hand wheel in the free end that the adjusting screw locates at the upper membrane cover, through the hand wheel forward or reverse rotation adjusting screw, adjusting screw takes place the rotary motion with the threaded sleeve, drive the clamp plate to move up or move down along upper membrane cover axial, and insert the draw-in groove adaptation through the latch between clamp plate and the annular adjusting sleeve, thus the clamp plate drives the annular adjusting sleeve to rotate, in order to realize the upward or downward movement to the wave spring; the clamping groove can be connected with the clamping tooth through simple transition fit, or the clamping groove and the clamping tooth can both adopt T-shaped structures comprising a horizontal section and a vertical section, the axial direction of the vertical section is parallel to the axial direction of the upper film cover, the length of the horizontal section of the clamping tooth is smaller than the width of the vertical end of the clamping groove, and when the clamping groove is used, the clamping tooth is inserted into the clamping groove firstly, and then the clamping groove can rotate for a certain distance to be embedded into the horizontal section on the corresponding side of the clamping groove and then drive the annular adjusting sleeve to rotate. The invention increases the adjusting range of the output pressure of the valve by adjusting the wave spring component and is flexible to adjust.
Preferably, the circumferential outer edge of the wave spring is welded with an annular connecting plate along the circumferential direction, the radial section of the annular connecting plate is of a T-shaped structure, the radial section of the annular adjusting sleeve is of a C-shaped structure matched with the annular connecting plate of the T-shaped structure, and the annular connecting plate and the annular adjusting sleeve are in clearance fit.
Preferably, a plurality of positioning rods are welded at the axial bottom end of the wave spring along the circumferential outer edge, and a plurality of guide grooves matched with the positioning rods are also formed in the inner wall of the upper film cover; the guide grooves are uniformly distributed along the circumferential direction of the inner wall of the upper film cover at equal intervals, and the extending direction of each guide groove is parallel to the axial direction of the upper film cover.
The axial bottom end of the wave spring is matched with the guide groove on the inner wall of the upper film cover through the positioning rod, so that a stable supporting and fixing effect can be provided for the axial bottom end of the wave spring, and the wave spring is prevented from radial deformation in the extrusion process of the membrane and the upper tray, and the pressure control precision is prevented from being influenced. And the top end of the wave spring is in clearance fit with the annular adjusting sleeve through the annular connecting plate, so that when the annular adjusting sleeve is rotated, the annular connecting plate does not rotate, but drives the wave spring to move up and down along the inner shaft of the upper film cover.
Preferably, the free end surfaces of the clamping teeth and the ground of the clamping groove are respectively provided with a mutually-matched magnet gasket.
Through all being equipped with the magnet gasket of mutual adaptation on the subaerial of the free end face of latch and draw-in groove, do benefit to draw-in groove and latch fastening connection, conveniently drive annular adjusting sleeve rotary motion through the clamp plate.
Preferably, a rubber pad is arranged on the circumferential outer wall of the pressing plate in a surrounding mode, and the rubber pad is in transitional fit contact with the inner wall of the upper membrane cover.
Through set up on the clamp plate outer wall with go up the membrane lid inner wall transition and join in marriage the rubber pad of suitable cooperation to increase the frictional resistance of clamp plate and last membrane lid, prevent to adjusting screw rotation in-process, rotate excessively.
The invention has the following advantages and beneficial effects:
The working principle of the invention is as follows: the wave springs are connected with the inner wall of the upper membrane cover through the annular adjusting sleeve in a threaded manner, so that a user can conveniently replace the wave springs with different types according to actual demands. Taking the working principle of valve back action as an example: the medium pressure P2 directly enters the lower membrane chamber and acts on the membrane to generate an upward thrust to drive the valve core to move upwards, and the valve moves towards the closing trend. The upper part of the diaphragm is provided with a wave spring, and the reaction force of the wave spring and the pressure on the diaphragm are balanced; p2 rises, the valve core trend moves upwards, the valve opening is reduced, the flow is reduced, and the P2 rising trend is weakened to a new balance point to form; otherwise, P2 is reduced, the valve core is pushed to move downwards by spring force, the opening degree of the valve is increased, the flow is increased, and P2 is increased. Therefore, the reaction force of the wave spring directly influences the pressure and flow of the output end of the invention. According to the invention, different types of wave springs can be selected according to actual demands, after the wave springs are selected, the wave springs are screwed into the upper membrane cover through the annular adjusting sleeve, and the wave springs can be continuously arranged at proper positions in the upper membrane cover through the rotary thread structure; in addition, through setting up the adjusting screw on the seal cover plate, the adjusting screw is threaded with threaded sleeve on the seal cover plate, can set up the hand wheel in the free end that the adjusting screw locates at the upper membrane cover, through the hand wheel forward or reverse rotation adjusting screw, adjusting screw takes place the rotary motion with the threaded sleeve, drive the clamp plate to move up or move down along upper membrane cover axial, and insert the draw-in groove adaptation through the latch between clamp plate and the annular adjusting sleeve, thus the clamp plate drives the annular adjusting sleeve to rotate, in order to realize the upward or downward movement to the wave spring; the clamping groove can be connected with the clamping tooth through simple transition fit, or the clamping groove and the clamping tooth can both adopt T-shaped structures comprising a horizontal section and a vertical section, the axial direction of the vertical section is parallel to the axial direction of the upper film cover, the length of the horizontal section of the clamping tooth is smaller than the width of the vertical end of the clamping groove, and when the clamping groove is used, the clamping tooth is inserted into the clamping groove firstly, and then the clamping groove can rotate for a certain distance to be embedded into the horizontal section on the corresponding side of the clamping groove and then drive the annular adjusting sleeve to rotate. The invention increases the adjusting range of the output pressure of the valve by adjusting the wave spring component and is flexible to adjust.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a schematic cross-sectional view of a main structure of the present invention;
FIG. 2 is a schematic view of a radial cross-sectional structure of a connection state of an annular connecting plate and an annular adjusting sleeve;
FIG. 3 is a schematic view of a mechanism of the present invention with a radial cross section of the lower membrane cover;
Fig. 4 is a schematic view of a cross-sectional structure of a latch and latch fitting according to the present invention.
In the drawings, the reference numerals and corresponding part names: 1-valve body, 2-lower film cover, 3-upper film cover, 4-film, 5-wave spring, 6-sealing cover plate, 7-annular adjusting sleeve, 8-valve rod, 9-lower tray, 10-upper tray, 11-threaded sleeves, 12-adjusting screws, 13-pressing plates, 14-clamping teeth, 15-clamping grooves, 16-annular connecting plates, 17-positioning rods, 18-guiding grooves, 19-rubber pads and 20-valve seats.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The embodiment provides a self-operated internal valve body which is beneficial to adjustment, comprising a valve body 1, a lower membrane cover 2 and an upper membrane cover 3 which are sequentially connected from bottom to top, wherein a membrane 4 is arranged in the lower membrane cover 2 near the bottom end; a wave spring 5 is arranged in the upper film cover 3; the axial one end of the valve rod 8 is tightly pressed by the lower tray 9 and the upper tray 10 and is connected with the diaphragm 4, the diaphragm 4 is positioned between the lower tray 9 and the upper tray 10, and the axial other end of the valve rod 8 extends into the valve body 1; an inner thread is arranged on the inner wall of the upper membrane cover 3, an annular adjusting sleeve 7 is arranged at the axial top end of the wave spring 5 along the circumferential outer edge, and an outer thread matched with the inner thread is arranged on the side wall of the axial outer edge of the annular adjusting sleeve 7; the axial bottom end of the wave spring 5 is used for contacting with the diaphragm 4;
The sealing cover plate 6 is provided with a through hole, and a thread bush 11 is arranged in the through hole; the pressure regulating valve further comprises an adjusting screw 12, one axial end of the adjusting screw 12 and the threaded sleeve 11 are matched to penetrate through the through hole and extend into the upper membrane cover 3, the end part of the adjusting screw 12 extending into the upper membrane cover 3 is provided with a pressing plate 13, the lower plate surface of the pressing plate 13 is convexly provided with a plurality of clamping teeth 14, and the end surface of the annular adjusting sleeve 7, facing the pressing plate 13, is provided with clamping grooves 15 matched with the clamping teeth 14.
Example 2
On the basis of embodiment 1, an annular connecting plate 16 is welded at the circumferential outer edge of the wave spring 5 along the circumferential direction, the radial cross section of the annular connecting plate 16 is of a T-shaped structure, the radial cross section of the annular adjusting sleeve 7 is of a C-shaped structure matched with the annular connecting plate 7 of the T-shaped structure, and the annular connecting plate 16 and the annular adjusting sleeve 7 are in clearance fit. A plurality of positioning rods 17 are welded at the axial bottom end of the wave spring 5 along the circumferential outer edge, and a plurality of guide grooves 18 matched with the positioning rods 17 are also formed in the inner wall of the upper membrane cover 3; the guide grooves 18 are uniformly distributed along the circumferential direction of the inner wall of the upper film cover 3 at equal intervals, and the extending direction of each guide groove 18 is parallel to the axial direction of the upper film cover 3.
Example 3
Further improvement on the basis of embodiment 2, the free end surface of the latch 14 and the ground of the slot 15 are respectively provided with mutually matched magnet gaskets. A rubber pad 19 is arranged on the circumferential outer wall of the pressing plate 13 in a surrounding mode, and the rubber pad 19 is in transitional fit contact with the inner wall of the upper membrane cover 3.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (1)
1. The self-operated internal valve is beneficial to adjustment and is characterized by comprising a valve body (1), a lower membrane cover (2) and an upper membrane cover (3) which are sequentially connected from bottom to top, wherein a membrane (4) is arranged in the lower membrane cover (2) close to the bottom end; a wave spring (5) is arranged in the upper film cover (3); the valve rod (8) is pressed by the lower tray (9) and the upper tray (10) to be connected with the membrane (4), the membrane (4) is positioned between the lower tray (9) and the upper tray (10), and the other axial end of the valve rod (8) stretches into the valve body (1), and the valve is characterized in that the upper membrane cover (3) is of a cylinder structure with two open ends, the sealing cover plate (6) is detachably arranged at the axial top end of the upper membrane cover (3), and the axial bottom end of the upper membrane cover (3) is connected with the lower membrane cover (2); an inner thread is arranged on the inner wall of the upper membrane cover (3), an annular adjusting sleeve (7) is arranged at the axial top end of the wave spring (5) along the circumferential outer edge, and an outer thread matched with the inner thread is arranged on the side wall of the axial outer edge of the annular adjusting sleeve (7); the axial bottom end of the wave spring (5) is used for being in contact with the upper tray (10); a through hole is formed in the sealing cover plate (6), and a thread bush (11) is arranged in the through hole; the device comprises an upper membrane cover (3), and is characterized by further comprising an adjusting screw (12), wherein one axial end of the adjusting screw (12) and a threaded sleeve (11) are matched to penetrate through a through hole and extend into the upper membrane cover (3), a pressing plate (13) is arranged at the end part of the adjusting screw (12) extending into the upper membrane cover (3), a plurality of clamping teeth (14) are convexly arranged on the lower plate surface of the pressing plate (13), and a clamping groove (15) matched with the clamping teeth (14) is formed in the end surface of the annular adjusting sleeve (7) facing the pressing plate (13);
An annular connecting plate (16) is welded at the circumferential outer edge of the wave spring (5) along the circumferential direction, the radial cross section of the annular connecting plate (16) is of a T-shaped structure, the radial cross section of the annular adjusting sleeve (7) is of a C-shaped structure matched with the annular connecting plate (16) of the T-shaped structure, and the annular connecting plate (16) and the annular adjusting sleeve (7) are in clearance fit;
a plurality of positioning rods (17) are welded on the outer edge of the wave spring (5) along the circumferential direction, and a plurality of guide grooves (18) matched with the positioning rods (17) are also formed in the inner wall of the upper film cover (3); the guide grooves (18) are uniformly distributed along the circumferential direction of the inner wall of the upper film cover (3) at equal intervals, and the extending direction of each guide groove (18) is parallel to the axial direction of the upper film cover (3);
the free end surfaces of the clamping teeth (14) and the ground of the clamping grooves (15) are respectively provided with a magnet gasket which is mutually matched;
a rubber pad (19) is arranged on the circumferential outer wall of the pressing plate (13) in a surrounding mode, and the rubber pad (19) is in transitional fit contact with the inner wall of the upper membrane cover (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172755.4A CN109114272B (en) | 2018-10-09 | 2018-10-09 | Self-operated internal valve beneficial to adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172755.4A CN109114272B (en) | 2018-10-09 | 2018-10-09 | Self-operated internal valve beneficial to adjustment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109114272A CN109114272A (en) | 2019-01-01 |
| CN109114272B true CN109114272B (en) | 2024-04-23 |
Family
ID=64857569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811172755.4A Active CN109114272B (en) | 2018-10-09 | 2018-10-09 | Self-operated internal valve beneficial to adjustment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109114272B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761464A (en) * | 1953-06-08 | 1956-09-04 | Norgren Co C A | Pilot controlled regulator |
| DE8912084U1 (en) * | 1989-10-11 | 1989-11-30 | ELSTER Produktion GmbH, 6503 Mainz-Kastel | Gas pressure regulator with pre-pressure compensation diaphragm |
| CN1636174A (en) * | 2000-07-07 | 2005-07-06 | S.H.莱吉特公司 | Direct-acting pressure regulator |
| JP2008299701A (en) * | 2007-06-01 | 2008-12-11 | Tabuchi Corp | Pressure reducing valve |
| CN101354092A (en) * | 2008-09-11 | 2009-01-28 | 天津市国威给排水设备制造有限公司 | Antifreeze type fluid built-in differential pressure transmission control valve |
| CN201884742U (en) * | 2010-11-01 | 2011-06-29 | 浙江科海仪表有限公司 | Operated micropressure adjusting valve |
| CN202972081U (en) * | 2012-11-01 | 2013-06-05 | 卓旦春 | Self-operated differential pressure balance valve |
| JP2016001364A (en) * | 2014-06-11 | 2016-01-07 | 愛知時計電機株式会社 | Pressure regulator |
| CN207569286U (en) * | 2017-12-01 | 2018-07-03 | 深圳市中天潜水装备有限公司 | A kind of device for lowering persons exhaust safety valve |
| CN209026272U (en) * | 2018-10-09 | 2019-06-25 | 四川勃朗蜀威科技有限公司 | Pressure-regulating valve based on internal pressure |
-
2018
- 2018-10-09 CN CN201811172755.4A patent/CN109114272B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2761464A (en) * | 1953-06-08 | 1956-09-04 | Norgren Co C A | Pilot controlled regulator |
| CH341132A (en) * | 1953-06-08 | 1959-09-30 | Faust Delbert Grant | Pressure regulator |
| DE8912084U1 (en) * | 1989-10-11 | 1989-11-30 | ELSTER Produktion GmbH, 6503 Mainz-Kastel | Gas pressure regulator with pre-pressure compensation diaphragm |
| CN1636174A (en) * | 2000-07-07 | 2005-07-06 | S.H.莱吉特公司 | Direct-acting pressure regulator |
| JP2008299701A (en) * | 2007-06-01 | 2008-12-11 | Tabuchi Corp | Pressure reducing valve |
| CN101354092A (en) * | 2008-09-11 | 2009-01-28 | 天津市国威给排水设备制造有限公司 | Antifreeze type fluid built-in differential pressure transmission control valve |
| CN201884742U (en) * | 2010-11-01 | 2011-06-29 | 浙江科海仪表有限公司 | Operated micropressure adjusting valve |
| CN202972081U (en) * | 2012-11-01 | 2013-06-05 | 卓旦春 | Self-operated differential pressure balance valve |
| JP2016001364A (en) * | 2014-06-11 | 2016-01-07 | 愛知時計電機株式会社 | Pressure regulator |
| CN207569286U (en) * | 2017-12-01 | 2018-07-03 | 深圳市中天潜水装备有限公司 | A kind of device for lowering persons exhaust safety valve |
| CN209026272U (en) * | 2018-10-09 | 2019-06-25 | 四川勃朗蜀威科技有限公司 | Pressure-regulating valve based on internal pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109114272A (en) | 2019-01-01 |
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