WO2010086628A1 - Régulateur d'écoulement de fluide - Google Patents

Régulateur d'écoulement de fluide Download PDF

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Publication number
WO2010086628A1
WO2010086628A1 PCT/GB2010/000168 GB2010000168W WO2010086628A1 WO 2010086628 A1 WO2010086628 A1 WO 2010086628A1 GB 2010000168 W GB2010000168 W GB 2010000168W WO 2010086628 A1 WO2010086628 A1 WO 2010086628A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
fluid flow
diaphragm
outlet
valve assembly
Prior art date
Application number
PCT/GB2010/000168
Other languages
English (en)
Inventor
Gareth Black
Original Assignee
Crane Limited
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 Crane Limited filed Critical Crane Limited
Publication of WO2010086628A1 publication Critical patent/WO2010086628A1/fr

Links

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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
    • F16K31/1268—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like with a plurality of the diaphragms
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0236—Diaphragm cut-off apparatus
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0672—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using several spring-loaded membranes

Definitions

  • the present invention relates to a fluid flow governor, and particularly, but not exclusively, to a gas flow governor for regulating gas pressure at its outlet as gas pressure at its inlet fluctuates.
  • a fluid flow governor is a type of fluid flow valve which regulates or "governs" the outlet pressure of a fluid flowing through the governor.
  • gas flow governors may be installed in a gas service pipe to ensure that gas supplied to a downstream property or appliance is maintained within a pre-determined range (or at a pre-determined value) despite changes in supply pressure upstream of the governor as pressure in the gas mains pipe fluctuates.
  • One known type of gas flow governor is disclosed in UK Patent No. GB2317672 and comprises a diaphragm controlled valve assembly mounted within a governor body between a gas flow inlet and gas flow outlet defined by the body.
  • the valve assembly is secured within the body by a cover which is crimped around the body and supports a spring loaded adjustment assembly which is operable to set the desired outlet pressure.
  • the valve assembly is sealed within the body by three O- ring seals which are energised as the cover is crimped to the body.
  • first O-ring seal is clamped between the cover and the valve assembly (to seal the valve assembly with respect to the cover) and second and third O-ring seals are clamped between the valve assembly and the body (to seal the valve assembly with respect to the body) as the cover and body are forced together.
  • a fluid flow governor comprising a housing including a main body defining a fluid flow inlet, a fluid flow outlet and an internal cavity therebetween, a valve assembly located within said housing cavity for controlling fluid flow from the inlet to the outlet to thereby regulate fluid pressure at the outlet wherein the valve assembly is sealed with respect to said cavity by at least a first annular resilient seal member located in a respective annular gap defined between a first substantially cylindrical outer surface of the valve assembly and a first substantially cylindrical wall surface defined by the cavity.
  • the resilient seal member of the present invention is subject to substantially radially compression and is energised simply by location of the valve assembly within the housing cavity. In particular, no additional clamping force is required from a cap or any other component of the fluid flow governor in order to energise the seal. With the present invention the integrity of the seal is more reliably established and maintained than with the prior art discussed above. It is preferable that there is a second annular seal member similarly located within an annular gap defined between a cylindrical surface of the cavity and a cylindrical surface of the valve assembly. This, and other preferred and advantageous features of the invention are described in more detail below.
  • Fig 1 is a perspective view of a gas flow governor in accordance with the present invention.
  • Fig 2 is an exploded view of the gas flow governor of Fig 1 ;
  • Fig 3 is an exploded view of a valve assembly of the gas flow governor of Figs 1 and 2;
  • Fig 4 is a cross section of the valve assembly of Fig 3.
  • Figs 5a and 5b are perspective views of the assembled valve assembly;
  • Fig 6 is a cross section through the fully assembled fluid flow governor of Fig 1.
  • figure 1 is a perspective view of a gas flow governor in accordance with an embodiment of the present invention.
  • the illustrated governor comprises a main body 1 and a cap 2 which is secured to the body by crimping an upper edge of the body Ia around the circumference of the lid 2.
  • the body 1 defines a gas supply inlet 3 and outlet 4.
  • Figure 2 is an exploded view of the governor of figure 1 revealing a diaphragm controlled valve assembly 5 and adjuster spring 6 which are held in position when the cap 2 is fitted to the body 1 by crimping open end Ia of the body around circumferential edge 2a of the cap.
  • valve assembly 5 is fitted with first and second resilient O-ring seal members 7 and 8 which seal the valve member with respect to the body when the valve assembly is fitted into the body.
  • seals are energised simply by inserting the valve assembly 5 into the main body 1 without the requirement for any clamping load to be applied by the cap. This will be described in more detail below.
  • the valve assembly comprises a valve spindle 9 supported by a diaphragm assembly 10 which is mounted to a generally cylindrical tubular valve body 1 1 which is provided with a gas flow inlet 12 and outlet 13.
  • the valve spindle 9 extends axially through the valve body 1 1 and has an enlarged head 13 which cooperates with a valve seat 14 defined within the outlet 13 of the valve body 1 1 by an inwardly extending annular flange.
  • the enlarged head 13 of the spindle 9 is provided with an elastomeric shroud 13a (for instance fabricated from nitrile rubber or other suitable material) to ensure a gas tight seal is formed when the valve head 13 is seated on the valve seat 14.
  • the diaphragm assembly 10 comprises primary and secondary diaphragms 15 and 16 respectively which are separated by a first diaphragm support member 17 and diaphragm spacer 18.
  • the primary and secondary diaphragms 15 and 16, diaphragm support plate 17, and spacer 18, are all annular having respective central apertures to receive the valve spindle 9.
  • the valve spindle 9 extends thus through the valve assembly components which are secured between an annular shoulder 19 defined by the valve spindle 9 and a second diaphragm support member 20 which is snap fitted to the end of the valve spindle which extends from the primary diaphragm 15.
  • the secondary diaphragm 16 is first fitted to the valve body 11 and is then clamped in place by the first diaphragm support member 17 which is a snap-fitted to the valve assembly body 11 - resilient lungs 17a clipping the member 17 to the body 1 1.
  • the outer periphery of the secondary diaphragm 16 is provided with a beaded rim portion 16a which is received within a complimentary annular groove 21 defined by a radially extending flange 22 of the valve body 1 1. This ensure a good seal between the secondary diaphragm 16 and the valve body 1 1.
  • valve spindle 9 is inserted through the outlet 13 of the valve body 1 1 and through central apertures defined by the secondary diaphragm 16 and diaphragm support member 17 respectively.
  • Diaphragm spacer 18 is then fitted onto the spindle 9.
  • the primary diaphragm 15 is then fitted onto the spindle and the assembly is completed by snap fitting the second diaphragm support member 20 to the end of the spindle 9 to clamp the valve assembly components together.
  • the inner periphery of the secondary diaphragm 16 is trapped between the diaphragm spacer 18 and the annular shoulder 19 defined by the valve spindle 9.
  • the inner periphery of the primary diaphragm 15 is trapped between the diaphragm spacer 18 and the second diaphragm support member 20.
  • the outer periphery of the primary diaphragm 15 is provided with a beaded rim 15a which is received within an annular recess defined at the periphery of the diaphragm support plate 17.
  • the first diaphragm support plate 17 has a generally dished configuration defining an annular wall 17b at its periphery, which together with the diaphragm spacer 18 ensures that an annular diaphragm chamber 23 is defined between the first diaphragm support member 17, secondary diaphragm 16 and the primary diaphragm 15.
  • the first and second O-ring seal members 7 and 8 are then fitted to the valve assembly prior to its installation in the main body 1 of the governor housing.
  • the first O-ring seal member 7 is seated around the outer circumference of the cylindrical wall 17b of the first diaphragm support member 17 and the second O-ring seal member 8 is seated around the cylindrical outer surface of the outlet end of the valve body 11.
  • the first O-ring seal 7 is located against an annular shoulder 17c extending radially from the cylindrical wall 17b and the second O-ring seal member 8 is located against an annular shoulder 1 1 a extending radially from the valve body 1 1.
  • valve assembly 5 is inserted into a cavity Ib defined within the main body 1 as illustrated in figure 6.
  • first O-ring 7 is radially compressed in an annular gap defined between the first diaphragm support member wall 17b and a first inner cylindrical wall surface of the body cavity Ib to form a first seal
  • second O-ring seal member 8 is radially compressed in an annular gap defined between the valve body 1 1 and a second inner cylindrical wall surface of the body cavity Ib to form a second seal.
  • first and second seals are energised simply by insertion of the valve assembly 5 into the governor body 1, the first and second O- ring seal members 7 and 8 being compressed radially (with respect to the axis of the valve spindle 9) between outer cylindrical surfaces of the valve assembly 5 and inner cylindrical surfaces of the main body 1 respectively. No additional clamping force (and in particular no axial clamping force) is required to energise and maintain the integrity of the seals. Assembly of the governor is then completed by fitting the cap 2 to the main body
  • the cap 1 supports an adjusting spindle 23 which carries a radially extending spring adjusting plate 24.
  • the adjusting spindle 23 extends through a hole provided in the centre of an upper cylindrical portion 2b of the cap
  • the spring 6 is compressed between the adjusting plate 24 and the second diaphragm support member 20.
  • the spring 6 is located between a central boss 20a defined on the upper surface of the second diaphragm support plate 20 and a central generally frusto-conical locating portion defined on the underside of the adjusting plate 24.
  • the cap 2 has a depending peripheral skirt portion 2a which seats within a surrounding peripheral portion Ia of the main body 1 which is then crimped around the cap to secure the cap 2 and the body 1 together (in figure 6 the assembly is shown prior to the crimping operation).
  • the outer peripheral edge of the primary diaphragm 15 is clamped between the cap 2 and the first diaphragm support member 17 to ensure a good seal between the two.
  • no axial clamping force is applied to either the first or second O- ring seal members 7 and 8, which instead are energised simply by location of the valve assembly 5 within the main body 1.
  • the governor according to the invention functions essentially in a known manner. That is, the adjuster spring exerts a downward force on the valve spindle 9 via the diaphragm plate 20 which acts to move the head 13 of the valve spindle 9 off the valve seat 14 allowing gas to flow from the governor inlet 3 to the governor outlet 4 through the valve body 11.
  • the valve spindle 9 is designed such that upward force on the spindle generated by the inlet gas pressure acting on the secondary diaphragm 16 is at least substantially balanced by downward force on the spindle through the downward static pressure exerted on the head 13 of the spindle as gas flows to the outlet 3.
  • the gas pressure at the outlet 3 generates an upward force on the valve head 13 tending to urge the spindle 9 upwards against the biasing force of the adjusting spring 6 until the forces are balanced.
  • Downward force exerted on the spindle by the spring thus determines the desired pressure at the governor outlet 3. That is, should the inlet pressure increase, tending to increase the pressure at the outlet, the upward force on the valve spindle 9 will likewise increase moving the spindle upwards against the action of the spring 6 thereby reducing the size of the annular gap between the spindle head 13 and the valve seat 14 which in turn reduces the outlet pressure until force balance is once again reached between the outlet pressure and the biasing force of the spring.
  • the wall portions which define the annular gaps within which the first and second O-ring seal members 7 and 8 are compressed may be defined by different portions of the valve assembly and governor body 1 respectively.
  • governors according to the present invention are not limited to gas flow governors intended for regulating natural gas supply pressure from a gas mains.
  • governors according to the present invention can be used to regulate the gas supply of pressure to individual gas appliances and similarly can be used in many industrial applications in which controlled gas supply pressure is required.
  • the invention is not limited to regulating gas flow, but can be used with any fluid, including liquids. Appropriate applications of governors according to the present invention will be readily apparent to the appropriately skilled person.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Safety Valves (AREA)

Abstract

La présente invention porte sur un régulateur d'écoulement de fluide comprenant un boîtier qui comporte un corps principal (1) définissant une entrée d'écoulement de fluide (3), une sortie d'écoulement de fluide (4) et une cavité inférieure entre celles-ci. Un ensemble soupape est disposé à l'intérieur de la cavité de boîtier afin de réguler l'écoulement de fluide de l'entrée vers la sortie de façon à réguler la pression de fluide à la sortie. L'ensemble soupape (5) est étanche vis-à-vis de la cavité grâce à un joint d'étanchéité élastique annulaire (7, 8) disposé dans un espace annulaire respectif défini entre une surface cylindrique extérieure de l'ensemble soupape (5) et une surface cylindrique de paroi définie par la cavité.
PCT/GB2010/000168 2009-02-02 2010-02-02 Régulateur d'écoulement de fluide WO2010086628A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0901626.2A GB0901626D0 (en) 2009-02-02 2009-02-02 Fluid flow governor
GB0901626.2 2009-02-02

Publications (1)

Publication Number Publication Date
WO2010086628A1 true WO2010086628A1 (fr) 2010-08-05

Family

ID=40469404

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2010/000168 WO2010086628A1 (fr) 2009-02-02 2010-02-02 Régulateur d'écoulement de fluide

Country Status (2)

Country Link
GB (1) GB0901626D0 (fr)
WO (1) WO2010086628A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110553070A (zh) * 2019-09-29 2019-12-10 绥中泰德尔自控设备有限公司 一种动态平衡二通阀
CN112628457A (zh) * 2020-12-31 2021-04-09 江苏兰格特自动化设备有限公司 一种气动执行机构的扭矩限制装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076320A (en) * 1990-10-19 1991-12-31 Siemens Automotive L.P. Fuel rail mounted fuel pressure regulator
GB2275989A (en) * 1993-03-12 1994-09-14 Bosch Gmbh Robert Combination valve
GB2317672A (en) 1996-08-28 1998-04-01 Jeavons Engineering Limited Fluid flow governors and valves
WO2002010625A1 (fr) * 2000-07-31 2002-02-07 S.H. Leggitt Company Couvercle de securite pour regulateurs de pression de gaz

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076320A (en) * 1990-10-19 1991-12-31 Siemens Automotive L.P. Fuel rail mounted fuel pressure regulator
GB2275989A (en) * 1993-03-12 1994-09-14 Bosch Gmbh Robert Combination valve
GB2317672A (en) 1996-08-28 1998-04-01 Jeavons Engineering Limited Fluid flow governors and valves
WO2002010625A1 (fr) * 2000-07-31 2002-02-07 S.H. Leggitt Company Couvercle de securite pour regulateurs de pression de gaz

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110553070A (zh) * 2019-09-29 2019-12-10 绥中泰德尔自控设备有限公司 一种动态平衡二通阀
CN112628457A (zh) * 2020-12-31 2021-04-09 江苏兰格特自动化设备有限公司 一种气动执行机构的扭矩限制装置
CN112628457B (zh) * 2020-12-31 2022-02-18 江苏兰格特自动化设备有限公司 一种气动执行机构的扭矩限制装置

Also Published As

Publication number Publication date
GB0901626D0 (en) 2010-01-13

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