WO2010045946A1 - Servo-soupape - Google Patents

Servo-soupape Download PDF

Info

Publication number
WO2010045946A1
WO2010045946A1 PCT/DK2009/000222 DK2009000222W WO2010045946A1 WO 2010045946 A1 WO2010045946 A1 WO 2010045946A1 DK 2009000222 W DK2009000222 W DK 2009000222W WO 2010045946 A1 WO2010045946 A1 WO 2010045946A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve seat
diaphragm
servo valve
servo
valve
Prior art date
Application number
PCT/DK2009/000222
Other languages
English (en)
Inventor
Michael Birkelund
Original Assignee
Danfoss A/S
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 Danfoss A/S filed Critical Danfoss A/S
Publication of WO2010045946A1 publication Critical patent/WO2010045946A1/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
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/402—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a diaphragm
    • F16K31/404—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a diaphragm the discharge being effected through the diaphragm and being blockable by an electrically-actuated member making contact with the diaphragm
    • 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
    • F16K25/00—Details relating to contact between valve members and seats
    • F16K25/005—Particular materials for seats or closure elements

Definitions

  • the present invention relates to a servo valve.
  • the present invention relates to a servo valve with a valve seat and a diaphragm which under the influence of a pressure difference causes the servo valve to open or close.
  • Generally servo valves exist in which a diaphragm is movable between an open and a closed position under the influence of a pressure difference between an inlet and an outlet and/or a control chamber.
  • One advantage of such valves is that due to a relatively simple design, the pressure difference may be used to open and close the valve.
  • the simple design causes the valve to have a relatively low weight and low power consumption compared to conventional valves.
  • the diaphragm In servo valves, it is normally desirable that the diaphragm is as resilient as possible so as to ensure that a passage defined between the diaphragm and the valve seat is sealingly closed, when the diaphragm abuts the valve seat.
  • the stiffness of such resilient materials e.g. rubber
  • the ability of the diaphragm to slow down the velocity of its rim portion during closing of the valve is limited. This causes the closing of the valve to produce an undesirable noise.
  • the present invention relates to a servo valve comprising:
  • valve passage defining an inlet, and an outlet
  • a closure arrangement which is movable between an open and a closed state, in which the valve passage is open and closed, respectively, in response to a pressure difference between the pressure in control chamber and the inlet;
  • closure arrangement comprises a valve seat and a diaphragm which:
  • the diaphragm is made from a material which is stiffer and/or harder than the valve seat.
  • the present invention is based on a principle in which the stiffness of the valve seat and the diaphragm is reversed.
  • This provides the advantage that the valve seat may be sufficiently soft to ensure the seal between the diaphragm and the valve seat when the valve is closed.
  • the diaphragm may be designed to have the desired closing speed i.e. the speed of the inner rim portion of the diaphragm while the diaphragm is brought into contact with the valve seat. This may be used to reduce the noise associated with closing of the valve.
  • a further advantage of providing a stiffer diaphragm is that the operating pressure between the inlet and the outlet may be increased. A reason is that increased stiffness generally is associated with increased fatigue strength which allows the valve to be designed to cope with a larger operating pressure.
  • the valve seat may comprise rubber such as FKM, EPDM, HNBR, NBR, TFE/P, FVMQ, PVMQ, VMQ, LSR, TPE and/or plastic such as PTFE, REEK, PFA, TFM, PE, PVDF, ECTFE.
  • rubber such as FKM, EPDM, HNBR, NBR, TFE/P, FVMQ, PVMQ, VMQ, LSR, TPE and/or plastic such as PTFE, REEK, PFA, TFM, PE, PVDF, ECTFE.
  • the diaphragm may comprise a metal material such as steel or hard plastic such as PTFE, REEK, PFA, TFM, PE, PVDF, ECTFE.
  • the stiffness and/or hardness of two elements may in some embodiments be determined by comparing two identically shaped elements, a first made from the same material as the diaphragm, and a second made from the same material as the valve seat. Such elements could be rod shaped elements or sheets of the two materials.
  • the stiffness is quantified in terms of the module of elasticity, whereby the module of elasticity of the diaphragm in some embodiments is larger than the module of elasticity of the valve seat.
  • the module of elasticity of the diaphragm is at least 10 times larger than the module of elasticity of the valve seat, such as 50 times larger, such as 100 times larger, such as 200 times larger, such as 500 times larger, such as 1000 times larger.
  • the module of elasticity of the valve seat is below 100 N/mm 2 , such as below 50 N/mm 2 , such as below 20 N/mm 2 .
  • the module of elasticity of the diaphragm is above 100 N/mm 2 , such as above 200 N/mm 2 , such as above 500 N/mm 2 , such as above 1000 N/mm 2 .
  • the diaphragm is harder than the valve seat.
  • the hardness of the valve seat and the diaphragm may be determined by means of any known methods for determining surface hardness such as ball-indentation hardness, Brinell-hardness or Shore-D-hardness.
  • the diaphragm has a larger surface hardness relative to the valve seat, such as a surface hardness which is 20 percent larger, such as a surface hardness which is 50 percent larger, such as a surface hardness which is 100 percent larger, such as 500 percent larger, such as 1000 percent larger.
  • the diaphragm has a ball-indentation hardness above 10 N/mm 2 , such as above 50 N/mm 2 , such as above 100 N/mm 2 .
  • the ball-indentation hardness of the valve seat may be below 10 N/mm 2 , such as below 5 N/mm 2 .
  • a tubular section is defined inside by housing. The tubular section may define an inner surface which defines a conduit that is fluidly connected to the inlet and/or the outlet of the housing.
  • the tubular section and the housing may form a monolithic element (i.e. defining one element without seams between the housing and the tubular section).
  • the tubular section may be a separate element which during assembly is inserted into the housing and fastened/mounted thereto.
  • the tubular section may extend in a direction transverse to an initial or final flow direction of the inlet or the outlet, respectively.
  • initial flow direction is meant the direction the fluid generally flows upon entering the servo valve through its inlet.
  • final flow direction shall be understood as the direction the fluid generally flows upon exiting the servo valve through its exit.
  • the outer surface of the tubular section defines a receiving zone which is adapted to receive the valve seat.
  • the receiving zone may define a shape adapted to be engaged by the valve seat.
  • the receiving zone defines a recess into which a corresponding protrusion of the valve seat may be inserted so as to fasten the valve seat to the tubular section.
  • the recess may extend along the outer circumference of tubular section. Alternatively, the recess extends in a longitudinal direction of the tubular section.
  • valve seat may be attached to the tubular section in any other manner.
  • the valve seat may be detachably attached to the receiving zone e.g. by means of a threaded outer surface of the tubular section and a corresponding threaded inner surface of the valve seat.
  • the valve seat may comprise an inner attachment member such as a metal ring with a threaded inner surface.
  • the valve seat is fastened to the tubular section by means of an interference fit or by means of an adhesive or by means of a locking ring or by means of a snap-lock connection.
  • valve seat is retained in relation to the tubular section by means of a support plate.
  • a support plate may comprise two abutment zones, a first adapted to abut the valve seat and a second adapted to abut another surface of the servo valve such.
  • the support plate may be adapted to retain the valve seat radially and/or axially relative to the tubular section.
  • the support plate is a circular disc defining a centre hole adapted to abut a corresponding circular outer surface of the valve seat so as to retain the valve seat radially.
  • the circular disc may be concave such that the cavity extends from the outer rim portion of the disc and into the centre hole.
  • the disc may be arranged to retain the valve seat both radially and axially relative to the tubular section.
  • the support plate defines a plurality of passages through which the fluid flows when the closure arrangement is in its open state.
  • the passages makes is possible to arrange the support plate such that it extends across the flow channel while at the same time allowing the fluid to flow through the flow channel.
  • the support plate may be made of a metal material such as stainless steel or brass. In one embodiment the support plate is made from a plastic material such as PPS or PVDF.
  • the servo valve is a servo valve with assisted lift (also called forced servo valves) in which means for forcing the diaphragm way from abutment with the valve seat is provided.
  • Such means may be a spring.
  • One advantage of providing such a spring is that when the pressure difference between the inlet and the outlet is small, the spring will force the diaphragm away from abutment with the valve seat and thus keep the valve open despite the low pressure difference.
  • Fig. 1 discloses a sectional view of the servo valve in its closed state
  • Fig. 2 discloses a close up of the zone marked "E" in Fig. 1 ,
  • Fig. 3 discloses a close up of the zone marked "B" in Fig. 4,
  • Fig. 4 discloses a sectional view of the servo valve in its open state
  • Figs. 5 and 6 disclose the servo pilot nozzle arrangement according to the present invention.
  • Figs. 7 and 8 disclose the valve seat according to the present invention.
  • Fig. 1 discloses the servo valve 100 comprising a housing 102, which defines a control chamber 104, a closure arrangement 106 and a valve passage
  • servo valve 100 which is defined by an inlet 108 and an outlet 110 and the below described flow passage 115.
  • Figs. 1 and 2 the servo valve 100 is disclosed in a closed state, whereas the servo valve 100 is disclosed in its open state in Figs. 3 and 4.
  • the housing 102 comprises an upper part 101 and a lower part 105.
  • the latter defines the inlet 108 and the outlet 110.
  • the upper part 101 is fastened to the lower part 105 by means of a threaded connection and a sealing member 103, e.g. an o-ring, is provided in an area of overlap between the upper part 101 and the lower part 105.
  • the closure arrangement 106 comprises a ring-shaped valve seat 112 (visible in Figs. 2 and 3) which is secured to a tubular section 113 of the housing 102.
  • the tubular section 113 defines a conduit 111 with an inner surface 109 and which is fluidly connected to the outlet 110.
  • the closure arrangement 106 further comprises a servo pilot nozzle 114 and a diaphragm 116 which are secured to each other and which are moveable between an open state - disclosed in Fig. 3 - and a closed state - disclosed in Fig. 2.
  • the diaphragm 116 contacts the valve seat 112, whereby no flow passage 115 is defined between the valve seat 112 and the diaphragm 116.
  • the diaphragm 116 and the valve seat 112 are spaced apart, whereby a flow passage 115 is defined between the valve seat 112 and the diaphragm 116.
  • a fluid may flow from the inlet 108 through passages 136, further through the flow passage 115 and finally out through the outlet 110, as indicated by arrow 118. It will be appreciated that a small part of the fluid will flow from the inlet 108, through a throttling bore 119, further through the control chamber 104, the pilot channel 120, and into the outlet 110.
  • the control chamber 104 is fluidly connected to the inlet 108 by means of the throttling bore 119.
  • the servo pilot nozzle 114 defines an upper surface 122 which is adapted to be engaged by a closure member 124.
  • the closure member 124 is movable by means of an electromagnet (not shown) between a proximal and a distal direction, relative to the closure arrangement 106. It will be appreciated that in other embodiments the closure member 124 may be moved by means of hydraulics and/or pneumatics and/or manually.
  • the closure member 124 When the closure member 124 is positioned in the distal position (i.e. in its upper position in Figs. 1-4), the closure member 124 does not abut the upper surface 122 of the servo pilot nozzle 114. In this situation, the control chamber 104 is fluidly connected to the outlet 110 via the servo pilot nozzle 114, which causes the closure arrangement 106 to move upwards until the servo valve is completely opened.
  • the closure arrangement 106 When the closure member 124 is positioned in the proximal position (i.e. in its downwards position in Fig. 1-4), the closure arrangement 106 is forced into contact with the valve seat 112, and is prevented from moving between the open and closed state.
  • a spring 125 In order to bias the closure member 124 in the proximal direction a spring 125 is provided
  • a support plate 126 is provided for retaining the valve seat 112 in relation to the housing 102.
  • the support plate 126 is arranged to abut an upper surface 128 of the valve seat 112 so as to force a lower surface 130 of the valve seat 112 into contact with a receiving zone 132 of the housing 102.
  • the receiving zone 132 is defined on an outer surface 134 of the tubular section 113.
  • the outer rim 135 portion of the support plate 126 is received in the upper part 101 of the housing 102.
  • the support plate 126 may be fastened to the upper part 101 by means of an interference fit or by means of a locking member such as a locking ring or by being screwed into the upper part or by any other suitable fastening method.
  • the outer rim 135 of the support plate 126 may define a threaded surface adapted to engage a corresponding inner threaded surface of the upper part 101.
  • a plurality of passages 136 are provided for allowing a fluid to flow from the inlet 108 to the outlet 110, when the closure arrangement 106 is positioned in the open state.
  • Figs. 5 and 6 discloses a sectional view and an isometric view of the closure arrangement 106.
  • the closure arrangement 106 comprises servo pilot nozzle 114 and a diaphragm 116.
  • a diaphragm washer 138 is provided for retaining the diaphragm 116 in relation to the servo pilot nozzle 114.
  • any force applied to the diaphragm 116 by the fluid is transferred to the diaphragm washer 138 due to the large abutment surface between the diaphragm 116 and the diaphragm washer 138.
  • Figs. 7 and 8 discloses a sectional and an isometric view of the valve seat 112.
  • the valve seat 112 defines an upper surface 128 for abutment with the support plate 126 and a lower surface 130 for abutment with the receiving zone 132 of the housing 102.

Landscapes

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

Abstract

L’invention concerne une servo-soupape (100) comprenant un siège de soupape (112) et un diaphragme (116), qui peut être déplacée entre un état fermé dans lequel la servo-soupape est fermée et un état ouvert dans lequel la servo-soupape est ouverte, un fluide pouvant s'écouler entre le diaphragme et le siège de soupape. Le diaphragme est plus rigide et/ou plus dur que le siège de soupape.
PCT/DK2009/000222 2008-10-21 2009-10-21 Servo-soupape WO2010045946A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200801462 2008-10-21
DKPA200801462 2008-10-21

Publications (1)

Publication Number Publication Date
WO2010045946A1 true WO2010045946A1 (fr) 2010-04-29

Family

ID=41403075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2009/000222 WO2010045946A1 (fr) 2008-10-21 2009-10-21 Servo-soupape

Country Status (1)

Country Link
WO (1) WO2010045946A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011067035A1 (fr) * 2009-12-01 2011-06-09 Robert Bosch Gmbh Soupape
EP3133326A1 (fr) * 2015-08-18 2017-02-22 Danfoss A/S Vanne
US11976747B2 (en) 2019-03-20 2024-05-07 Danfoss A/S Compressor unit with a damped axial check valve for a discharge outlet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590737A (fr) * 1924-02-14 1925-06-22 Nouvelle vanne
US6092550A (en) * 1997-02-03 2000-07-25 Swagelok Marketing Co. Diaphragm valve seat arrangement
DE202006001009U1 (de) * 2006-01-24 2007-06-06 A. u. K. Müller GmbH & Co KG Eigenmediumbetätigtes durch einen Magnetanker gesteuertes Servoventil
JP2008069935A (ja) * 2006-09-15 2008-03-27 Tlv Co Ltd パイロット式スチームトラップ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590737A (fr) * 1924-02-14 1925-06-22 Nouvelle vanne
US6092550A (en) * 1997-02-03 2000-07-25 Swagelok Marketing Co. Diaphragm valve seat arrangement
DE202006001009U1 (de) * 2006-01-24 2007-06-06 A. u. K. Müller GmbH & Co KG Eigenmediumbetätigtes durch einen Magnetanker gesteuertes Servoventil
JP2008069935A (ja) * 2006-09-15 2008-03-27 Tlv Co Ltd パイロット式スチームトラップ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011067035A1 (fr) * 2009-12-01 2011-06-09 Robert Bosch Gmbh Soupape
EP3133326A1 (fr) * 2015-08-18 2017-02-22 Danfoss A/S Vanne
WO2017029073A1 (fr) * 2015-08-18 2017-02-23 Danfoss A/S Soupape
CN107923551A (zh) * 2015-08-18 2018-04-17 丹佛斯有限公司 阀
US10767786B2 (en) 2015-08-18 2020-09-08 Danfoss A/S Valve with a pilot valve seat arranged in a diaphragm
US11976747B2 (en) 2019-03-20 2024-05-07 Danfoss A/S Compressor unit with a damped axial check valve for a discharge outlet

Similar Documents

Publication Publication Date Title
CN102348916B (zh) 压力动作控制阀
US20170108131A1 (en) Check valve
US20130092864A1 (en) Check valve
US9033305B2 (en) Water valve with supported opening function
EP2923126B1 (fr) Dispositif et procédé de réduction de la force nécessaire de l'actionneur dans und vanne de commande
JPH06341560A (ja) ダイヤフラム弁
WO2008008465B1 (fr) Ensemble de collecteur de vanne
RU2403479C2 (ru) Регулирующий клапан со встроенным вставным седлом и направляющими запорно-регулирующего органа
US7175157B2 (en) Fluid controller
US9194501B2 (en) Pressure balanced spring loaded overtravel sealing apparatus
US6997211B2 (en) Multiple material valve plug for high temperature operation
US10738901B1 (en) Check valve
KR20060118467A (ko) 밸브 조립체
KR101440381B1 (ko) 버터플라이밸브의 양방향 메탈시트 실링구조
WO2010045946A1 (fr) Servo-soupape
KR20080099635A (ko) 이중밀봉구조를 갖는 글로브밸브
US20170009902A1 (en) Rigid Piston Retrofit for a Diaphragm Flush Valve
US20090312674A1 (en) Electromagnetic valve and pneumatic massage apparatus
JP2005069463A (ja) 高温用ケージ弁
JPH0214586B2 (fr)
US10697560B2 (en) Valve mechanism for controlling a fluid, in particular an abrasive high-viscosity material
KR100907344B1 (ko) 온수분배기의 밸브구조
EA027985B1 (ru) Клапан высокого давления
US9605764B2 (en) Liquid control valve
JP2006266403A (ja) 混合弁

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09740842

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 09740842

Country of ref document: EP

Kind code of ref document: A1