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WO1986005012A1 - Soupape pilote actionnee par une palette - Google Patents

Soupape pilote actionnee par une palette Download PDF

Info

Publication number
WO1986005012A1
WO1986005012A1 PCT/US1986/000277 US8600277W WO8605012A1 WO 1986005012 A1 WO1986005012 A1 WO 1986005012A1 US 8600277 W US8600277 W US 8600277W WO 8605012 A1 WO8605012 A1 WO 8605012A1
Authority
WO
WIPO (PCT)
Prior art keywords
flapper
sealing surface
upper chamber
chamber
valve
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US1986/000277
Other languages
English (en)
Inventor
R. David Anderson
George S. Jacobs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MIZER CONTROLS Inc
Original Assignee
MIZER CONTROLS Inc
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 MIZER CONTROLS Inc filed Critical MIZER CONTROLS Inc
Publication of WO1986005012A1 publication Critical patent/WO1986005012A1/fr
Priority to NO864099A priority Critical patent/NO864099L/no
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/14—Control of fluid pressure with auxiliary non-electric power
    • G05D16/18—Control of fluid pressure with auxiliary non-electric power derived from an external source
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/14—Control of fluid pressure with auxiliary non-electric power
    • G05D16/18—Control of fluid pressure with auxiliary non-electric power derived from an external source
    • G05D16/185—Control of fluid pressure with auxiliary non-electric power derived from an external source using membranes within the main valve

Definitions

  • the present invention relates to pilot valves of the type used to send an output signal pressure to a pneumatically operated, process valve for controlling the valve and, specifically, to a flapper actuated pilot valve where the output signal pressure is proportional to the force applied by the flapper.
  • the oil and gas, chemical and other industries utilize process valves for controlling the flow of process fluids which are operated by means of a pneumatic control signal.
  • the pneumatic control for such valves typically includes a pilot valve whose function is to send an output signal pressure to the pneumatic controller, which either opens or closes the process valve.
  • a liquid level controller which uses a "float” or displacement type sensor to transmit changes in the liquid level in the tank to a pilot valve outside the vessel.
  • the pilot valve signals a process control or discharge valve in the discharge outlet from the vessel to open or close the discharge valve in response to the liquid level within the vessel.
  • the float within the vessel interior is connected to a "flapper" outside the vessel which, in turn, acts upon the pilot valve.
  • the pilot valve operates in "on-off” fashion to either emit an output control pressure or to vent the control pressure to the atmosphere.
  • other types of pneumatically controlled valves such as those featuring Bourdon tube controllers, it is desirable to provide a pilot valve which outputs a control pressure which is dependent upon the flapper force applied to the pilot valve.
  • a flapper actuated pilot valve in which the output control signal emitted by the valve is proportional to the flapper force applied to the valve.
  • the flapper actuated pilot valve of the invention has a valve body with an upper chamber, lower chamber and a gas passage which communicates the lower chamber, by means of a gas passage opening, with the upper chamber.
  • a gas inlet communicates with the lower chamber for supplying control gas pressure to the valve and a gas outlet in the upper chamber allows the flow of control gas pressure from the valve.
  • a poppet is provided having a lower end with a primary sealing surface for contacting the gas passage opening into the lower chamber to seal off the lower chamber from the upper chamber.
  • the poppet has an upper end which extends into the upper chamber and the upper end of the poppet has a secondary sealing surface thereon.
  • a flapper element having a lower portion which is adapted to contact the secondary sealing surface of the poppet and has an upper portion which extends through an opening in the valve body for contacting the flapper.
  • the flapper element has an interior bore which runs from the lower portion thereof to an exhaust port for exhausting control gas pressure from the upper chamber.
  • the secondary sealing surface of the poppet serves to block the escape of control gas pressure when the secondary sealing surface of the poppet contacts the flapper element lower portion.
  • a coil spring located in the lower chamber normally urges the primary sealing surface of the poppet against the gas passage opening in the absence of an external force applied by the flapper on the flapper element.
  • the flapper element is supported within the upper chamber by a pressure responsive diaphragm which seals the upper chamber from the atmosphere. An increase in control gas pressure within the upper chamber acts upon the diaphragm and, in turn, the flapper element to open the flapper element exhaust port and exhaust control gas pressure to the atmosphere.
  • the diaphragm, primary and secondary sealing surfaces of the pilot valve cooperate together to provide a pilot valve in which the output signal pressure from the pilot valve is proportional to the force applied by the flapper upon the flapper element.
  • Fig. 1 is a simplified, schematic view of a Bourdon tube controller util zing a flapper actuated pilot valve of the invention.
  • Fig. 2 is a side, cross-sectional view of the flapper actuated pilot valve of the invention.
  • Fig. 1 is a simplified, schematic view which shows a flapper actuated pilot valve 11 as it would be used in a Bourdon tube type process controller.
  • the flow of process fluid in a pipe 13 is controlled by means of a process control valve 15.
  • the valve 15 is pneumatically operated by means of a signal pressure in the conduit 17.
  • Such valves are well known and are commercially available.
  • the process pressure is detected and routed through a conduit 19 to one end of a Bourdon tube 21.
  • the tube expands as the pressure increases and bends a flapper 23 around a fulcrum 25 so that the free end 27 contacts a flapper element 29 of the pilot valve 11.
  • the force exerted by the flapper 23 upon the flapper element 29 causes a pressurized control signal which enters the pilot valve 11 through conduit 31 to pass through the conduit 17 to the process control valve 15.
  • the magnitude of the control signal which travels from the pilot valve through conduit 17 is proportional to the force applied to the flapper element 29 by the flapper 23.
  • the control signal in conduit 17 causes the process control valve 15 to open or close in Incremental fashion to thereby control the flow of process fluid in the pipe 13.
  • the pilot valve 11 has an upper chamber 35, a lower chamber 37 and a gas passage 39 which communicates the lower chamber, by means of a gas passage opening 41, with the upper chamber 35.
  • a gas inlet 43 communicates with the lower chamber 37 for supplying control gas pressure to the valve 11.
  • a gas outlet 45. is provided in the upper chamber 35 for allowing the flow of control gas pressure from the valve through the conduit 17 (Fig. 1) leading to the process control valve 15.
  • a poppet 47 has a lower end 49 with a primary sealing surface 51.
  • the primary sealing surface comprises a shoulder formed between the greater relative external diameter of the lower end 49 and the lesser relative external diameter of a mid region 53 of the poppet 47.
  • An 0-ring 55 rides upon the shoulder 51 and, in the position shown, contacts the chamber walls 57 of the lower chamber 37. The 0-r1ng 55 thus serves to seal off the lower chamber 37 from the upper chamber 35.
  • the poppet 47 al so has an upper end 59 of lesser rel ative external diameter than the mid region 53.
  • a shoul der 61 formed between the mid region 53 and upper end 59 comprises a secondary seal ing surface which carries 0-ring 63.
  • a fl apper el ement 65 i s provided in the upper chamber 35 having a lower portion 67 which is adapted to contact the secondary seal ing surface 61 of the poppet 47.
  • the fl apper el ement 65 al so has an upper portion 69 which extends through an opening 71 In the valve body 33 for contacting a fl apper, such as fl apper 23 i n Fig. 1.
  • the fl apper el ement lower portion 67 and upper portion 69 are general ly cylindrically shaped and joined by a cylindrical mid portion 73.
  • the exterior of the lower portion 67 is threaded to receive a nut 75 for engaging a flexible, pressure sensitive diaphragm 77.
  • the diaphragm 77 As shown in Fig. 2, the diaphragm 77, 1n the position shown, seals off the upper chamber 35 which is below the diaphragm 77 from the opening 71 and the atmosphere.
  • the periphery of the diaphragm 77 is secured by means of a cover plate 79 and bolts 81, 83 which retain the cover plate 79 on the valve body 33.
  • the flapper element 65 also has an interior bore 85 which runs . from an opening in the lower portion 67 thereof to an exhaust port 87 located on the opposite side of the diaphragm 77 from the opening into the upper chamber 35.
  • the secondary sealing surface 61 of the poppet 47 serves to block the escape of control gas pressure within the upper chamber 35 through the exhaust port 87 when the secondary sealing surface 61 is contacting the opening into the interior bore of the flapper element lower portion 67.
  • a biasing means such as coil spring 89 is located within the lower chamber 37 between a shoulder 91 formed upon the poppet 47 and a recess 93 formed in end cap 95.
  • the spring 89 normally urges the poppet 47 and primary sealing surface 51 against the gas passage opening 41 in the absence of an external force applied by the flapper upon the flapper element 65.
  • the end cap 95 is threaded! y engaged within the lower chamber 37 and includes an 0-ring seal 97.
  • the poppet upper end 59 is slidabl received within the lower extent of the flapper element interior bore 85.
  • the external diameter of the end 59 of poppet 47 is sized to leave an annular space between the exterior surface thereof and the surrounding interior bore 85 to allow the flow of control gas pressure from the upper chamber 35 through the exhaust port 87 when the secondary sealing surface 61 moves out of contact with the lower portion 67 of the flapper element 65.
  • the primary sealing surface 0-ring 55 presents a greater relative surface sealing area than the secondary sealing surface 0-ring 63. Because of the difference in surface areas, the primary sealing surface 51 will not open until after the secondary sealing surface 61 has closed and the secondary sealing surface 61 will close before the primary sealing surface 51 opens.
  • the pressure sensitive diaphragm area 99 which is exposed to the control gas pressure in the upper chamber is larger than the primary sealing surface area, so that the force opening and closing the primary and secondary sealing surfaces is the resultant of the external force applied by the flapper minus the diaphragm force.
  • Bourdon tube 21 As the tube 21 expands, flapper 23 is bent about the fulcrum 25, causing the flapper to apply a force to the flapper element 29. As the force is applied to the flapper element, three actions occur within the valve body in order. First, the flapper element lower portion 67 compresses the 0-ring 63 against the shoulder 61, closing off any possible gas flow from the upper chamber 35 through the exhaust port 87. Secondly, the primary sealing surface 51 moves away from the gas passage opening 41, allowing control gas from the inlet 43 to pass to the upper chamber 35, thereby causing a pressure increase in the chamber 35 and gas outlet 45. Thirdly, the increase in control gas pressure in the upper chamber 35 acts against the pressure sensitive area 99 of the diaphragm 77 causing a force to push against and oppose the force applied to the flapper element 65 by the flapper 23.
  • the secondary sealing 0-ring 63 moves off the lower portion 67 of the flapper element 65, allowing gas to flow from the upper chamber 35 through the interior bore 85 and exhaust port 87 to the atmosphere. This action decreases the outlet pressure in the upper chamber 35.
  • the pressure decrease in the upper chamber 35 decreases the force which the diaphragm 77 applies to the flapper element 65. As the diaphragm force decreases, the external force applied by the flapper 23 overcomes the diaphragm force, causing the secondary seal 63 to close. A further decrease in the upper chamber pressure can only be achieved by a decrease in the external flapper force which would repeat the cycle.
  • the primary seal formed by the 0-ring 55 cannot be opened until the secondary seal formed by 0-ring 63 is closed. This is true because the 0-ring 55 has a larger sealing surface than the 0-ring 63.
  • the force necessary to break the primary seal 55 is equal to the area of the sealing surface of 0-ring 55 times the difference of the pressures in the outlet and inlet chambers.
  • the force required to break the secondary 0-ring seal 63 is equal to the seal area of the 0-ring 63 times the difference of the outlet and atmospheric pressures. From the relationship of these forces and the fact that the inlet pressure is constant, it can be seen that the force required to open the primary seal and close the secondary seal is dependent upon the respective areas of the sealing surfaces.
  • the diaphragm 77 serves as a compensating or modulating means associated with the flapper element 65 whereby a known external force acting upon the flapper element 65 produces a known control gas pressure at the outlet 45.
  • the diaphragm pressure causes a force upon the fl apper el ement 65 which opposes the external force of the fl apper 23.
  • the control gas pressure increases in the upper chamber 35, the diaphragm force increases and eventual ly overcomes the external force appl ied by the fl apper. If the upper chamber pressure decreases, the diaphragm force decreases, all owing the external force appl ied by the fl apper to rule.
  • the force which opens and closes the primary and secondary seal ing surfaces is the resul tant of the external force appl ied by the fl apper minus the diaphragm force. If the diaphragm force minus the fl apper force resul ts in a positive val ue, the secondary seal ing surface 61 opens and the primary seal ing surface 51 cl oses. If the external force appl ied by the fl apper minus the diaphragm force resul ts in a posi tive val ue, the primary seal ing surface 51 opens and the secondary seal ing surface 61 closes.
  • the diaphragm force is equal to the output pressure minus the atmospheric pressure times the diaphragm area.
  • the ratio of the change in external flapper force to the change in output pressure is thus governed by the bore of the upper chamber 35, and hence the pressure responsive area 99 of the diaphragm 77.
  • the diaphragm area 99 must exceed the sealing surface area of the primary surface 51, the bore of chamber 35 can be varied to achieve different ratios between the flapper force and output pressure.
  • the output pressure can be made proportional to the flapper force so that a given force results in a given output and doubling that force results in a doubling of the output pressure.
  • the flapper actuated pilot valve of the invention is relatively simple in design and reliable in operation.
  • the valve can be inserted in many existing pressure controllers without the necessity of modifying the controller structure.
  • the control gas pressure is only exhausted when the secondary sealing surface is open, thereby resulting in a savings in control gas supplied to the unit.
  • the output of the pilot valve of the invention is dependent upon and proportional to the fl apper force making the valve wel l sui ted for use in proportional control environments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

Dans une soupape pilote actionnée par une palette, la pression de sortie de la soupape dépend de la force exercée par la palette, et est proportionnelle à celle-ci. La soupape comprend un corps de soupape (33) avec une chambre supérieure (35) et une chambre inférieure (37), ainsi qu'un passage interconnecteur de gaz (39). Une poupée (47) sollicitée par un ressort et agencée dans la chambre inférieure comprend une surface primaire d'étancheité (51) pour obturer la chambre inférieure et une surface secondaire d'étanchéité (63) en contact avec un élément à palette (65) agencé dans la chambre supérieure. L'élément à palette a un alésage intérieur (85) qui mène à un orifice d'échappement (87) à l'extrémité supérieure de l'élément à palette qui traverse une ouverture dans le corps de la soupape. L'élément à palette est soutenu dans la chambre supérieure par un diaphragme (77) sensible à la pression. La zone du diaphragme et les zones d'étanchéité primaire et secondaire coopèrent pour fournir une pression de gaz de sortie proportionnelle à la force extérieure appliquée par la palette sur l'élément à palette.
PCT/US1986/000277 1985-02-19 1986-02-10 Soupape pilote actionnee par une palette Ceased WO1986005012A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NO864099A NO864099L (no) 1985-02-19 1986-10-14 Klaffaktivert styreventil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70246585A 1985-02-19 1985-02-19
US702,465 1985-02-19

Publications (1)

Publication Number Publication Date
WO1986005012A1 true WO1986005012A1 (fr) 1986-08-28

Family

ID=24821326

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1986/000277 Ceased WO1986005012A1 (fr) 1985-02-19 1986-02-10 Soupape pilote actionnee par une palette

Country Status (4)

Country Link
EP (1) EP0215053A4 (fr)
AU (1) AU5458186A (fr)
CA (1) CA1268392A (fr)
WO (1) WO1986005012A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912993A (en) * 1958-06-13 1959-11-17 Jones Barton Motion transmitting mechanism for air transmitter
US2980075A (en) * 1959-03-02 1961-04-18 Hagan Chemicals & Controls Inc Diaphragm equalizing means and valve assemblies for totalizers
US3052254A (en) * 1959-09-08 1962-09-04 Asbury S Parks Pressure control devices
US3078716A (en) * 1959-12-09 1963-02-26 Richard Q Winters Liquid level controller
US3127189A (en) * 1964-03-31 Automatic control for vehicle suspension
US3181917A (en) * 1962-07-26 1965-05-04 Berg Airlectro Products Co Relay valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955760A (en) * 1975-05-05 1976-05-11 Evans Products Company Thermostatic air valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127189A (en) * 1964-03-31 Automatic control for vehicle suspension
US2912993A (en) * 1958-06-13 1959-11-17 Jones Barton Motion transmitting mechanism for air transmitter
US2980075A (en) * 1959-03-02 1961-04-18 Hagan Chemicals & Controls Inc Diaphragm equalizing means and valve assemblies for totalizers
US3052254A (en) * 1959-09-08 1962-09-04 Asbury S Parks Pressure control devices
US3078716A (en) * 1959-12-09 1963-02-26 Richard Q Winters Liquid level controller
US3181917A (en) * 1962-07-26 1965-05-04 Berg Airlectro Products Co Relay valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0215053A4 *

Also Published As

Publication number Publication date
EP0215053A1 (fr) 1987-03-25
EP0215053A4 (fr) 1988-03-22
AU5458186A (en) 1986-09-10
CA1268392A (fr) 1990-05-01

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