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WO1997018397A1 - Slow start supply and exhaust valve - Google Patents

Slow start supply and exhaust valve Download PDF

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Publication number
WO1997018397A1
WO1997018397A1 PCT/US1996/018700 US9618700W WO9718397A1 WO 1997018397 A1 WO1997018397 A1 WO 1997018397A1 US 9618700 W US9618700 W US 9618700W WO 9718397 A1 WO9718397 A1 WO 9718397A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
piston
exhaust
main
pilot
Prior art date
Application number
PCT/US1996/018700
Other languages
French (fr)
Inventor
Frank T. Bohenick
Original Assignee
Wilkerson Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wilkerson Corporation filed Critical Wilkerson Corporation
Priority to AU10802/97A priority Critical patent/AU1080297A/en
Publication of WO1997018397A1 publication Critical patent/WO1997018397A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/068—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with valves for gradually putting pneumatic systems under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0431—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the electrical control resulting in an on-off function
    • 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
    • F16K31/42—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor
    • F16K31/423—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor the actuated members consisting of multiple way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements

Definitions

  • the present invention relates to pilot actuated pressure fluid supply and exhaust valves More particularly, the present invention relates to a pilot actuated supply valve with slow start capabilities
  • a further object of the present invention is to provide an improved supply valve which enables a pneumatic system to build up pressure independently of the volume of air required for the system
  • Fig 1 is a vertical cross-section view through a valve embodying the present invention and showing the valve beginning its exhaust function
  • Fig 2 is a view similar to Fig 1 and showing the valve in the full exhaust position
  • Fig 3 is a view similar to Fig 1 and showing the valve in its initial slow start position with the exhaust valve partly closed
  • Fig 4 is a view similar to Fig 3 but showing the exhaust valve full ⁇ closed
  • Fig 5 is a view similar to Fig 4 but showing the main valve fully open
  • the present invention is embodied in a pilot actuated val ⁇ e mechanism 10 which includes emergency relief capabilities followed by a slow start function which pressurizes the fluid system independently of the volume of the svstem
  • a pilot actuated val ⁇ e mechanism 10 which includes emergency relief capabilities followed by a slow start function which pressurizes the fluid system independently of the volume of the svstem
  • the valve 10 is formed by a main start/stop valve housing 1 1 adapted for either direct connection to appropriate pressure fluid conduits such as air lines (not shown) or as a part of a modular system such as shown and desc ⁇ bed in U S Pat No 5,383,689
  • the valve housing 1 1 is secured to ad)o ⁇ n ⁇ ng modular fittings 12 by tracks 14 on the adjoining modular fittings 12 which slidablv engage in coacting slots in the valve housing 11 or v ice versa O- ⁇ ng seals 15 tightlv seal the units together
  • the valve 10 includes an emergency and pilot control exhaust valve housing 16 mounted on and securely and sealingly fastened to the stop/start valve housing 11
  • a three- way solenoid actuated pilot control valve 18 is operatively mounted on the exhaust valve housing 16 and receives control air from the main air supply line
  • the three-way solenoid actuated pilot control valve is of a standard construction and serves to control the operation of the emergencv stop slow start v alve 10 embodying the present invention
  • the start/stop valve housing 1 1 defines an inlet air chamber 20 tor receiving compressed air from any conventional compressed air system (not shown) and an outlet chamber 21 connected by appropriate conduit to v a ⁇ ous compressed air actuated appliances or devices (not shown)
  • the flow of air from the inlet chamber 20 to the outlet chamber 21 is controlled by a main flow control valve 22
  • the v alve is formed by a valve piston 23 slidingly and sealingly mounted in a cylinder 24 defined within the housing 1 1 , specificallv within a cap 30 threadably and sealingly engaged with the housing 1 1 and sealed thereto by an O- ⁇ ng 25
  • the valve piston 23 sealingly engages a v alv e seat 26 defined between the inlet chamber 20 and outlet chamber 21
  • An appropriate O- ⁇ ng seal 28 is provided on the face of the piston for seahngl v engaging the valve seat 26
  • a main valve spring 29 normally biases the main valve piston 23 to the closed position, and is retained within the valve housing 11 by the cap 30
  • Coextensive with said cylinder 24 in the cap 30 is a spring chamber 31 housing one end of the main valve spring 29 The other end of the spring 29 engages and pushes against the valve piston 23
  • the spring chamber 31 is open to the outlet chamber 21 through a central bore 32 in the main v alve piston 23 and a central bore 34 and port 35 defined in a main valve piston rod 36 secured to the valve piston 23 and extending through the outlet chamber 2 1 for engagement by a control piston assembly 38 housed within the exhaust valve housing 16
  • the exhaust valve housing 16 defines an exhaust chamber 40 connected to an exhaust outlet fitting 41 and housing an exhaust valve piston 42 adapted for sealing engagement with an exhaust valve seat 44 defined in the main valve housing 11 between the outlet chamber 21 and exhaust chamber 40
  • An appropriate O- ⁇ ng seal 45 on the exhaust valv e piston 42 provides a seal between the piston 42 and seat 44
  • the exhaust valve piston 42 is actuated bv pilot air from the pilot control valve 18
  • the valve housings 1 1 and 16 define pilot air passages 48 49 extending from the inlet chamber 20 to an adjustable orifice assembly 50 and outlet pilot passage 51 connected to the three-way control valve 18 for supplying pilot air to the three-way control valve 18 and an exhaust valve control chamber 56 defined within the exhaust valve housing 16
  • the adjustable orifice 50 is formed by a needle valve 52 positionable with respect to an orifice 54
  • the exhaust valve housing 16 also defines a pilot air control passage 55 opening into the control chamber 56 defined in the housing 16 on the opposite end of the exhaust valve piston 42 for supplying controlled pilot pressure fluid from the three-way valve 18
  • the exhaust valve piston 42 is slidingly mounted in the control chamber 56 and sealed thereto by an O- ⁇ ng 58 application of control pilot pressure fluid from the three-way valve 18 to the exhaust valve control chamber 56 seats the exhaust valve piston 42 against the valve seat 44 to prevent the exhaustion of air from the outlet chamber 21
  • valve 10 is shown with the main valve fully open and the exhaust valve shut in Fig 5 Upon release of the pilot pressure from the pi lot control chamber 56, air pressure in the outlet chamber 21 forces the exhaust v alve piston 42 off of the seat 44, as is shown in Fig 1 and then Fig 2 and compressed air exhausts from the outlet chamber 21 and air system through the exhaust valve fitting 41 to the atmosphere
  • the present invention utilizes a control pilot pressure actuated assembly 38 adapted to produce a slow start in repressu ⁇ zing the system
  • the slow start piston assembly 38 regulates the outlet pressure up to the inlet line pressure in chamber 20 through the main valve 22 so that the air pressure is built up gradually within the outlet chamber 21 and the downstream system
  • the exhaust valve piston 42 defines a centra! chamber 60 open at one end to the control chamber 56 and open at its other end to the outlet chamber 21 for providing a slow start function to the main valve 22
  • a pair of opposed pistons, a pilot drive piston 61 and a d ⁇ ven piston 62 are slidingly housed within the control chamber 60, being slidingly sealed thereto bv O- ⁇ ngs 64 65, and biased apart by a coil spring 66 for actuating the main control v alve 22
  • the d ⁇ ve piston 61 is positioned at the end of the chamber 60 open to the pilot air control chamber 56 and presents a larger surface area than the area of the driven piston 62 open to the outlet chamber 21.
  • the latter piston 62 operatively engages the valve rod 36 from the main valve piston 23 of the main control valve 22. By pushing on that rod 36, the piston 62 effects opening of the control valve 22 to allow compressed air to flow through the valve 22 from the inlet chamber 20 to the outlet chamber 21
  • the slow startup begins as shown in Fig. 2
  • the pilot valve 18 When the pilot valve 18 is energized, permitting inlet air pressure to pass through passages 48, 49, through the valve 18, and passage 55 to the control volume 56, the exhaust valve begins to close as shown in Fig. 3
  • the pilot piston 61 When the exhaust valve is completely closed as shown in Fig 4, the pilot piston 61 is pressed downward until it pushes against the driven piston 62, in turn pushing on the main valve piston rod 36 Rod 36 in turn pushes the main piston 23 downward, opening the main valve 22, as is shown in Fig. 5
  • valve of the present invention incorporates an internal control volume to provide slow start continuously up to 100% of the inlet air pressure
  • This internal control volume provides a pressure feedback system during slow start
  • the valve slow start in accordance with the invention is pressure dependent and volume independent
  • the pressu ⁇ zation of the downstream system thus occurs slowly, thus eliminating pressure spikes
  • the rate of pressure increase during slow start is controlled by the rate of air permitted into the internal control volume 56 bv needle valve 52

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

A valve (10) for controlling the supply and exhaust of compressed air to and from a compressed air operating system. The valve includes a pilot actuated normally closed main control valve (22) and a pilot actuated exhaust valve piston (42). A pilot actuated valve actuator (38) opens and closes the main valve (22) during system start repetitively in response to the build up of pressure in the system independently of the system volume until the system pressure is equalized.

Description

SLOW START SUPPLY AND EXHAUST VALVE
This application claims the benefit of United States Provisional Patent Application Serial No 60/006,427, filed on November 13, 1995
BACKGROUND OF THE INVENTION
1 . Field of the Invention The present invention relates to pilot actuated pressure fluid supply and exhaust valves More particularly, the present invention relates to a pilot actuated supply valve with slow start capabilities
2. Description of the Prior Art. Pilot actuated compressed air control and exhaust valves are known in the art as shown in U S Pat No 5,067,5 19, issued November 26, 1991 , to N E Russell and O H Libbv for " Safety Valve for Fluid Systems," and U S Pat No 4,56 1 .464 issued December 3 1 , 1985, to V L Frantz for "Relay Valve " The \ alve disclosed b> Russell, et al., includes a slow start function in which pilot air pressure is utilized to pressurize the system in its initial start up phase
OBJECTS OF THE INVENTION
It is the principal object of the present invention to provide an improved pilot actuated pressure fluid supply and exhaust valve with volume independent slow start capabilities.
A further object of the present invention is to provide an improved supply valve which enables a pneumatic system to build up pressure independently of the volume of air required for the system
Other objects and advantages of the present invention will become apparent from the fol lowing drawings and descπption DESCRIPTION OF THE DRAWINGS
Fig 1 is a vertical cross-section view through a valve embodying the present invention and showing the valve beginning its exhaust function
Fig 2 is a view similar to Fig 1 and showing the valve in the full exhaust position
Fig 3 is a view similar to Fig 1 and showing the valve in its initial slow start position with the exhaust valve partly closed
Fig 4 is a view similar to Fig 3 but showing the exhaust valve full\ closed
Fig 5 is a view similar to Fig 4 but showing the main valve fully open
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention is embodied in a pilot actuated val\ e mechanism 10 which includes emergency relief capabilities followed by a slow start function which pressurizes the fluid system independently of the volume of the svstem In describing the preferred embodiment o the present inv ention reference will be made to compressed air as the pressure fluid, it being understood that other fluids can be utilized with appropriate modifications to the valve construction
The valve 10 is formed by a main start/stop valve housing 1 1 adapted for either direct connection to appropriate pressure fluid conduits such as air lines (not shown) or as a part of a modular system such as shown and descπbed in U S Pat No 5,383,689 The valve housing 1 1 is secured to ad)oιnιng modular fittings 12 by tracks 14 on the adjoining modular fittings 12 which slidablv engage in coacting slots in the valve housing 11 or v ice versa O-πng seals 15 tightlv seal the units together In addition to the stop/start valve housing 1 1 the valve 10 includes an emergency and pilot control exhaust valve housing 16 mounted on and securely and sealingly fastened to the stop/start valve housing 11 A three- way solenoid actuated pilot control valve 18 is operatively mounted on the exhaust valve housing 16 and receives control air from the main air supply line The three-way solenoid actuated pilot control valve is of a standard construction and serves to control the operation of the emergencv stop slow start v alve 10 embodying the present invention
The start/stop valve housing 1 1 defines an inlet air chamber 20 tor receiving compressed air from any conventional compressed air system (not shown) and an outlet chamber 21 connected by appropriate conduit to v aπous compressed air actuated appliances or devices (not shown) The flow of air from the inlet chamber 20 to the outlet chamber 21 is controlled by a main flow control valve 22 The v alve is formed by a valve piston 23 slidingly and sealingly mounted in a cylinder 24 defined within the housing 1 1 , specificallv within a cap 30 threadably and sealingly engaged with the housing 1 1 and sealed thereto by an O-πng 25 The valve piston 23 sealingly engages a v alv e seat 26 defined between the inlet chamber 20 and outlet chamber 21 An appropriate O-πng seal 28 is provided on the face of the piston for seahngl v engaging the valve seat 26
A main valve spring 29 normally biases the main valve piston 23 to the closed position, and is retained within the valve housing 11 by the cap 30 Coextensive with said cylinder 24 in the cap 30 is a spring chamber 31 housing one end of the main valve spring 29 The other end of the spring 29 engages and pushes against the valve piston 23 The spring chamber 31 is open to the outlet chamber 21 through a central bore 32 in the main v alve piston 23 and a central bore 34 and port 35 defined in a main valve piston rod 36 secured to the valve piston 23 and extending through the outlet chamber 2 1 for engagement by a control piston assembly 38 housed within the exhaust valve housing 16
The exhaust valve housing 16 defines an exhaust chamber 40 connected to an exhaust outlet fitting 41 and housing an exhaust valve piston 42 adapted for sealing engagement with an exhaust valve seat 44 defined in the main valve housing 11 between the outlet chamber 21 and exhaust chamber 40 An appropriate O-πng seal 45 on the exhaust valv e piston 42 provides a seal between the piston 42 and seat 44 The exhaust valve piston 42 is actuated bv pilot air from the pilot control valve 18
The valve housings 1 1 and 16 define pilot air passages 48 49 extending from the inlet chamber 20 to an adjustable orifice assembly 50 and outlet pilot passage 51 connected to the three-way control valve 18 for supplying pilot air to the three-way control valve 18 and an exhaust valve control chamber 56 defined within the exhaust valve housing 16 The adjustable orifice 50 is formed by a needle valve 52 positionable with respect to an orifice 54
The exhaust valve housing 16 also defines a pilot air control passage 55 opening into the control chamber 56 defined in the housing 16 on the opposite end of the exhaust valve piston 42 for supplying controlled pilot pressure fluid from the three-way valve 18 The exhaust valve piston 42 is slidingly mounted in the control chamber 56 and sealed thereto by an O-πng 58 application of control pilot pressure fluid from the three-way valve 18 to the exhaust valve control chamber 56 seats the exhaust valve piston 42 against the valve seat 44 to prevent the exhaustion of air from the outlet chamber 21
The valve 10 is shown with the main valve fully open and the exhaust valve shut in Fig 5 Upon release of the pilot pressure from the pi lot control chamber 56, air pressure in the outlet chamber 21 forces the exhaust v alve piston 42 off of the seat 44, as is shown in Fig 1 and then Fig 2 and compressed air exhausts from the outlet chamber 21 and air system through the exhaust valve fitting 41 to the atmosphere
When control pilot air pressure is supplied by the three-way valve to the exhaust control chamber 56, the exhaust valve piston 42 is again seated against the valve seat 44 thereby closing the outlet air chamber 21 to the atmosphere as is shown in Fig 5 Compressed air supplied to the inlet chamber 20 flows through the main valve 22, when opened, to the outlet chamber 21 and thereby repressuπzes the system However, this repressuπzation is not immediate
In accordance with the present invention, the opening of the mam v alv e
22 is controlled so that the system is slowly repressuπzed independently oi the system volume, allowing the pressure to build up gradually in order to prevent damage to the air actuated instruments, appliances and devices forming a part of the system To this end, the present invention utilizes a control pilot pressure actuated assembly 38 adapted to produce a slow start in repressuπzing the system The slow start piston assembly 38 regulates the outlet pressure up to the inlet line pressure in chamber 20 through the main valve 22 so that the air pressure is built up gradually within the outlet chamber 21 and the downstream system
The exhaust valve piston 42 defines a centra! chamber 60 open at one end to the control chamber 56 and open at its other end to the outlet chamber 21 for providing a slow start function to the main valve 22 A pair of opposed pistons, a pilot drive piston 61 and a dπven piston 62 are slidingly housed within the control chamber 60, being slidingly sealed thereto bv O-πngs 64 65, and biased apart by a coil spring 66 for actuating the main control v alve 22
The dπve piston 61 is positioned at the end of the chamber 60 open to the pilot air control chamber 56 and presents a larger surface area than the area of the driven piston 62 open to the outlet chamber 21. The latter piston 62 operatively engages the valve rod 36 from the main valve piston 23 of the main control valve 22. By pushing on that rod 36, the piston 62 effects opening of the control valve 22 to allow compressed air to flow through the valve 22 from the inlet chamber 20 to the outlet chamber 21
The slow startup begins as shown in Fig. 2 When the pilot valve 18 is energized, permitting inlet air pressure to pass through passages 48, 49, through the valve 18, and passage 55 to the control volume 56, the exhaust valve begins to close as shown in Fig. 3 When the exhaust valve is completely closed as shown in Fig 4, the pilot piston 61 is pressed downward until it pushes against the driven piston 62, in turn pushing on the main valve piston rod 36 Rod 36 in turn pushes the main piston 23 downward, opening the main valve 22, as is shown in Fig. 5
As air flows into the outlet chamber 21 and from there into the air pressure system, air pressure in the outlet chamber 21 builds up and exerts a force on the driving piston 62 This pressure acts to compress the biasing spring 66 and allows the main flow control valve 22 to regulate the outlet chamber 21 Control pilot air pressure from the control valve 18 continues to increase in the control chamber 56, exerting a force on the upper piston 61 and acting through the biasing spring 66 on the driving piston 62 which in turn continues to increase the regulated pressure in chamber 21 by the main valve 22 until the pressure in chamber 21 is the same as the pressure in the inlet chamber 20
Once the pressure in chambers 20 and 21 are equal, the main valve 22 fully opens and remains so, and the exhaust valve remains fully closed At this point, the compressed air powered system is fully pressurized regardless of its application volume Thus the valve of the present invention incorporates an internal control volume to provide slow start continuously up to 100% of the inlet air pressure This internal control volume provides a pressure feedback system during slow start Thus the valve slow start in accordance with the invention is pressure dependent and volume independent The pressuπzation of the downstream system thus occurs slowly, thus eliminating pressure spikes The rate of pressure increase during slow start is controlled by the rate of air permitted into the internal control volume 56 bv needle valve 52
While the invention has been described with reference to a particular preferred embodiment thereof, it is to be understood that many equivalents modifications, variations, and alternatives to the structure shown in the Figures and described will become readily apparent to those skilled in the art to which this invention pertains Accordingly, all such changes and modifications are intended to be within the scope of the invention as defined by the appended claims All patents, patent applications, and printed publications referred to herein are hereby incorporated by reference in their entirety

Claims

What is claimed is.
1 A valve for controlling the supply and exhaust of compressed air to and from a compressed air operating system, said valve supplying air from an inlet under inlet air pressure to an outlet under outlet air pressure, and comprising a pilot actuated normally closed main control valve, a pilot actuated exhaust valve, and a pilot actuated valve actuator for opening and closing said main valve during system start in response to the build up of pressure in said system independently of the volume thereof 2 The valve according to claim 1 wherein said exhaust valve has a hollow exhaust piston disposed within an exhaust valve housing and said pilot actuated valve actuator comprises a control piston assembly housed within said exhaust valve piston
3 The valve according to claim 2 wherein one end of said exhaust piston slides within an exhaust control chamber defined within said exhaust valve housing
4 The valve according to claim 3 wherein said control piston assembly comprises a pair of drive pistons shdablv disposed in said exhaust piston and a biasing spring between said pistons biasing said drive pistons apart
5 The valve according to claim 4 wherein said main control valve comprises a main valve piston connected to one end of one of said drive pistons
6. The valve according to claim 5 wherein said main valve comprises a housing defining an inlet chamber and an outlet chamber, a main valve piston disposed in a cylinder defined within said main valve housing, and a main valve seat, said piston and said seat separating said chambers 7 The valve according to claim 6 wherein said main valve further comprises an elongated piston rod having one end fastened to said main valve piston, the other end of said piston rod engaging said one of said drive pistons
8 The valve according to claim 4 wherein said main control valve compπses a main valve piston connected to one of said drive pistons
9 The valve according to claim 8 wherein said main v alve comprises a housing defining an inlet chamber and an outlet chamber, a main valve piston disposed in a cylinder defined within said main valve housing, and a main valve seat, said piston and said seat separating said chambers
10 The valve according to claim 9 wherein said other of said pair of drive pistons has an end open to said exhaust control chamber
1 1 A valve for controlling the supply and exhaust of compressed air to and from a compressed air operating system, said valve supplying air from an inlet under inlet air pressure to an outlet under outlet air pressure, and comprising a pilot actuated normally closed main valve, a pilot actuated exhaust valve, a pair of opposed actuator pistons including a pilot drive piston and a dπve piston, a spring normally biasing said pistons apart, one of said drive pistons being subjected to pilot air pressure, said drive piston being subject to valve outlet pressure, and a piston rod operatively coupling said drive piston to said main valve
12 A valve for controlling the supply and exhaust of compressed air to and from a compressed air operating system, said valve supplying air from an inlet under inlet air pressure to an outlet under outlet air pressure, and comprising a pilot actuated normally closed main valve, and a pilot actuated exhaust valve, characterized by a pilot actuated valve actuator for opening and closing said main valve during system start in response to the build up of pressure in said system independently of the volume thereof, said valve actuator comprising
a pair of opposed actuator pistons including a pilot dπve piston and a drive piston, a spring normally biasing said pistons apart, one of said drive pistons being subjected to pilot air pressure, the other of said drive pistons being subject to valve outlet pressure, and a piston rod operatively coupling said drive piston to said main valve
13 The valve according to claim 12 wherein said main valve comprises a housing defining an inlet chamber and an outlet chamber, a main valve piston disposed in a cylinder defined within said main valve housing and a main valve seat, said piston and said seat separating said chambers, said piston rod being connected to said main valve piston
14 The valve according to claim 1 3 wherein said pair of drive pistons slide within a hollow exhaust valve piston in said exhaust valve
1 5 The valve according to claim 1 1 wherein said main valve comprises a housing defining an inlet chamber and an outlet chamber, a main valve piston disposed in a cylinder defined within said main valv e housing and a main valve seat, said piston and said seat separating said chambers, said piston rod being connected to said main valve piston
16 The valve according to claim 15 wherein said pair of drive pistons slide within a hollow exhaust valve piston in said exhaust v alve
1 7 The valve according to claim 16 wherein said exhaust valve has a hollow exhaust piston disposed within an exhaust valve housing and said drive pistons are housed within said exhaust valve piston 18 The valve according to claim 17 wherein one end of said exhaust piston slides within an exhaust pilot control chamber defined within said exhaust valve housing.
19 The valve according to claim 18 wherein said pilot piston has a larger outer end surface area than the outer end surface of said driven piston
20 The valve according to claim 19 wherein during startup, said drive pistons oscillate back and forth in said exhaust piston to slowly build up outlet pressure until inlet pressure equals outlet pressure
PCT/US1996/018700 1995-11-13 1996-11-13 Slow start supply and exhaust valve WO1997018397A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10802/97A AU1080297A (en) 1995-11-13 1996-11-13 Slow start supply and exhaust valve

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US642795P 1995-11-13 1995-11-13
US60/006,427 1995-11-13
US74497896A 1996-11-07 1996-11-07
US08/744,978 1996-11-07

Publications (1)

Publication Number Publication Date
WO1997018397A1 true WO1997018397A1 (en) 1997-05-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/018700 WO1997018397A1 (en) 1995-11-13 1996-11-13 Slow start supply and exhaust valve

Country Status (2)

Country Link
AU (1) AU1080297A (en)
WO (1) WO1997018397A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884513A3 (en) * 1997-06-09 1999-03-24 Bürkert Werke GmbH & Co. Valve combination
WO2008040411A1 (en) * 2006-09-29 2008-04-10 Festo Ag & Co. Kg Valve device having a soft start function
EP1845294A3 (en) * 2006-04-13 2008-06-11 Honeywell International Inc. Guided pneumatic second stage switching valve
WO2009021962A3 (en) * 2007-08-16 2009-06-25 Hoerbiger Automatisierungstech Valve arrangement
CN108425832A (en) * 2018-01-25 2018-08-21 温州曼哲科技有限公司 A kind of normally closed intake valve of air compressor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561464A (en) * 1984-11-07 1985-12-31 Roanoke College Relay valve
US5067519A (en) * 1990-11-26 1991-11-26 Ross Operating Valve Company Safety valve for fluid systems
US5337788A (en) * 1993-10-22 1994-08-16 Robertshaw Controls Company Pneumatic valve with slow start and quick exhaust

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4561464A (en) * 1984-11-07 1985-12-31 Roanoke College Relay valve
US5067519A (en) * 1990-11-26 1991-11-26 Ross Operating Valve Company Safety valve for fluid systems
US5337788A (en) * 1993-10-22 1994-08-16 Robertshaw Controls Company Pneumatic valve with slow start and quick exhaust

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884513A3 (en) * 1997-06-09 1999-03-24 Bürkert Werke GmbH & Co. Valve combination
US5975486A (en) * 1997-06-09 1999-11-02 Burkert Werke Gmbh & Co. Valve combination
EP1845294A3 (en) * 2006-04-13 2008-06-11 Honeywell International Inc. Guided pneumatic second stage switching valve
WO2008040411A1 (en) * 2006-09-29 2008-04-10 Festo Ag & Co. Kg Valve device having a soft start function
WO2009021962A3 (en) * 2007-08-16 2009-06-25 Hoerbiger Automatisierungstech Valve arrangement
CN108425832A (en) * 2018-01-25 2018-08-21 温州曼哲科技有限公司 A kind of normally closed intake valve of air compressor

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