WO2002038994A1 - Soupape de surete actionnee par un clapet pilote - Google Patents

Soupape de surete actionnee par un clapet pilote Download PDF

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Publication number
WO2002038994A1
WO2002038994A1 PCT/US2001/028964 US0128964W WO0238994A1 WO 2002038994 A1 WO2002038994 A1 WO 2002038994A1 US 0128964 W US0128964 W US 0128964W WO 0238994 A1 WO0238994 A1 WO 0238994A1
Authority
WO
WIPO (PCT)
Prior art keywords
spool
valve
vent
inlet
channel
Prior art date
Application number
PCT/US2001/028964
Other languages
English (en)
Inventor
Ying S. Lai
Erwin R. S. Cortez
Original Assignee
Curtiss Wright 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 Curtiss Wright Corporation filed Critical Curtiss Wright Corporation
Priority to AU2001294572A priority Critical patent/AU2001294572A1/en
Publication of WO2002038994A1 publication Critical patent/WO2002038994A1/fr

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
    • G05D16/16—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
    • G05D16/166—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid using pistons within the main valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • 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
    • F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston

Definitions

  • a safety pressure-relief system typically includes 5 a relief or main valve mounted over a pressure vessel, 6 such as a tank or flow line, and a pilot valve which 7 controls operation of the main valve.
  • the main valve 8 moves to an open position when the fluid pressure 9 within the vessel rises above a predetermined set value 0 to relieve or reduce the fluid pressure within the 1 vessel and moves back to a closed position when the 2 fluid pressure within the vessel is reduced below the 3 set value.
  • the pilot valve is of a non-flowing 5 type wherein no system fluid flows through the pilot 6 valve when the main valve is in a static condition 7 below the set value or open and flowing.
  • Non-flowing 8 pilot valves typically have a higher sensitivity and a 9 faster response to pressure changes in the system fluid 0 as compared with pilot valves having a continuous fluid 1 flow therethrough.
  • these pilot valves 2 may have superior operation when the relief valve is returned to its closed position because the pilot valve is not influenced by flowing system fluid.
  • the fast response of these pilot valves is obtained by a snap or pop action of valve elements. For example, see U.S. Patent No.
  • the present invention provides a non-flowing pilot
  • 25 includes a body having a channel formed therein, an
  • a first spool is
  • a second spool is
  • the second spool 32 movable within the channel.
  • the second spool also cooperates
  • a spring is located between the first spool and the second spool such that it urges the first and second spools in opposite directions.
  • the first spool resiliently bears on the second spool via the spring to close the vent-valve when the inlet valve is open. With the vent valve closed in this resilient manner, the components are not subjected to undesirable levels of stress when the pilot valve is utilized in relatively high pressure applications.
  • FIG. 1 is an elevational view, in partial cross- section, of a pressure relief valve system having a relief valve and a pilot valve according to the present invention, wherein the relief valve is shown in a closed position
  • FIG. 2 is an elevational view, in partial cross- section, of the relief valve system of FIG. 1, wherein the relief valve is in a relieving position
  • FIG. 3 is an enlarged sectional view, taken along line 3-3 of FIG. 1, showing the pilot valve wherein the lines connecting the relief valve and the pilot valve are removed for clarity;
  • FIG. 1 is an elevational view, in partial cross- section, of a pressure relief valve system having a relief valve and a pilot valve according to the present invention, wherein the relief valve is shown in a closed position
  • FIG. 2 is an elevational view, in partial cross- section, of the relief valve system of FIG. 1, wherein the relief valve is in a relieving position
  • FIG. 3 is an enlarged sectional view, taken along line 3-3 of FIG. 1, showing the pilot valve wherein the lines connecting the relief
  • FIG. 4 is an enlarged fragmentary view of a portion of the pilot valve of FIG. 3;
  • FIG. 5A is an enlarged fragmentary view of a portion of the pilot valve of FIG. 4 showing an inlet valve in an open condition;
  • FIG. 5B is an enlarged fragmentary view of a portion of the pilot valve of FIG. 4 showing the inlet valve in a closed condition;
  • FIG. 6A is an enlarged fragmentary view of a portion of the pilot valve of FIG. 4 showing a vent valve in a closed condition;
  • FIG. 6B is an enlarged fragmentary view of a portion of the pilot valve of FIG. 4 showing the vent valve in an open condition;
  • FIG. 7 is a graphical illustration of modulating action of the relief valve.
  • FIG. 1 illustrates a pilot-operated pressure- relief valve system 10 according to the present invention.
  • the pressure-relief valve system 10 includes a relief or main valve 12, a pilot valve 14, an inlet line or tube 16 extending between the main valve 12 and the pilot valve 14, a control line or tube 18 extending between the main valve 12 and the pilot valve 14, and a discharge line or tube 20 extending from the pilot valve 14.
  • a support 22 is preferably provided which secures the pilot valve 14 to the main valve 12.
  • the main valve 12 is preferably of conventional construction including a body 24 forming a hollow interior cavity, a nozzle element 26, a cap or cover 28, a piston 30, and a compression spring 32.
  • the nozzle element 26 is secured to the body 24 within the interior cavity and divides the interior cavity into a first or inlet chamber 34 and a second or outlet chamber 36.
  • the nozzle element 26 is secured to the body 24 in any suitable manner such as, for example, the illustrated press fit.
  • a suitable seal member 38 such as, for example, the illustrated 0-ring is provided between the nozzle element 26 and the body 24 to form a fluid-tight seal therebetween.
  • One end of the nozzle element 26, which faces the outlet chamber 36 forms an annularly-shaped valve seat 40.
  • the body 24 has a first or lower opening 42 in communication with the inlet chamber 34, a second or side opening 44 in communication with the outlet chamber 36, and a third or upper opening 46 in communication with the outlet chamber 36.
  • the first opening 42 has a first flange 48 which is sealingly connected to an outlet flange 50 of a pressure vessel or tank 52 holding a pressurized fluid.
  • the second opening 44 has a second flange 54 which is sealingly connected to an inlet flange 56 of a discharge line or pipe 58.
  • the flanges 48, 50, 54, 56 are sealingly connected in any suitable manner such as, for example, the illustrated nut 60 and bolt 62 combinations.
  • the third opening 46 is closed by the cover 28.
  • the cover 28 is secured to the body 24 by any suitable manner such as, for example, the illustrated threaded fasteners 64.
  • a suitable seal member 66 such as, for example, the illustrated O-ring is preferably provided between the body 24 and the cover 28 to form a fluid- tight seal therebetween.
  • valve-seat seal 80 mounted on an end of the piston 30 facing the valve seat 40 is a valve-seat seal 80 arranged to seal the nozzle element 26 when engaging the valve seat 40.
  • the valve-seat seal 80 is attached to the piston in any suitable manner such as, for example, the illustrated compression spring 32 biases the piston 30 toward the nozzle element 26 with the valve-seat seal 80 in sealing contact with the valve seat 40 to prevent fluid flow between the inlet and outlet chambers 34, 36.
  • the pilot valve 14 has a valve body including a main body 82 and a bonnet 84 attached to the main body 82.
  • the pilot valve 14 also includes a movable upper piston 86 located generally near the interface of the main body 82 and the bonnet 84, a vent assembly 88 adjustably secured to the main body 82, a first or upper spool 90, extending within the main body 82 and movable with the upper piston 86, and a second or lower spool 92 slidably received in the main body 82 and engageable with the vent assembly 88.
  • a seal member 148 such as the illustrated O-ring, is provided between the body 82 and a hollow tail portion 93 of the upper spool 90 to provide a fluid-tight seal therebetween.
  • the upper spool 90 includes a cup-shaped head portion 91 which is threaded onto the hollow tail portion 93 and which cooperate to form a continuation of the inlet chamber 112 through radial passages 95 in the head portion 91.
  • the bonnet 84 has a flange 94 adapted to cooperate with a top surface 96 of the main body 82.
  • a plurality of threaded fasteners (not shown) downwardly extend through openings in the bonnet flange 94 and into threaded blind holes located in the main body 82 to secure the main body 82 and the bonnet 84 together.
  • the main body 82 and the bonnet are provided with vertically extending channels or bores 100, 102 having a common central axis 104.
  • the bores 100, 102 preferably have a circular cross-section and cooperate with one another as described in more detail hereinafter.
  • the main body 82 has an upper or inlet port 106, an intermediate or control port 108, and a lower or vent port 110 which are each substantially perpendicular to the central axis 104 and in fluid flow communication with the main body bore 100.
  • the bore 100 of the main body 82 includes an inlet chamber 112 at least partially formed by an upper portion of the bore 100 located at or near the top of the main body, a discharge or vent chamber 114 at least partially formed by a lower portion of bore 100 located near the bottom of the main body 82, and a control chamber 116 at least partially formed by an intermediate portion of the bore 100 and located between and spaced-apart from the inlet and vent chambers 112, 114.
  • the upper portion of the bore 100 preferably has a diameter larger than both the intermediate and lower portions, while the lower portion of the bore 100 preferably has a diameter larger than the intermediate portion and smaller than the upper portion.
  • a first radially extending passage 118 connects the inlet port 106 with the inlet chamber 112, preferably near the lower end of the inlet chamber 112.
  • a second radially extending passage 120 connects the vent port 110 with the vent chamber 114.
  • a third radially extending passage 122 connects the control port 108 with the control chamber 116.
  • the movable upper piston 86 is slidably received in a bore of a sleeve 124 which is coaxial with the bores 100, 102 of the main body 82 and the bonnet 84.
  • the sleeve 124 connects the bores 100, 102 of the main body 82 and the bonnet 84 and forms a downwardly-facing annular shaped stop or abutment.
  • the sleeve is located within counterbores at the upper end of the main body bore 100 and the lower end of the bonnet bore 102 and is clamped between the main body 82 and the bonnet 84.
  • the sleeve 124 is rigidly secured to the main body so that the stop or abutment is also rigidly secured thereto.
  • the upper piston 86 is rigidly secured to the upper spool 90 for longitudinal movement therewith near an upper end of the upper spool 90.
  • a pin 125 extends through the upper piston 86 and is secured between a cap nut 126 located above the upper piston 86 and a retainer portion 128 of the pin 125 located below the upper piston 86.
  • a diaphragm 129 of suitable flexible material is secured between the upper piston 86 and the main body 82.
  • the inner edge of the diaphragm 129 is clamped between the lower end of the upper piston 86 and the upper end of the upper spool 90.
  • the outer edge of the diaphragm 129 is clamped between an upward facing surface of the main body 82 and the lower end of the sleeve 124.
  • the system pressure which is continually present in the inlet chamber 112 and its continuation, is applied to the effective area of the upper piston 86 and the diaphragm 129 to move the upper piston 86, and the upper spool 90 secured thereto, in an upward direction.
  • a first or upper compression spring 130 is located within the bore 102 of the bonnet 84 between opposed upper and lower spring followers 132, 134.
  • the lower spring follower 134 directly engages the cap nut 126 of the pin 125 so that the upper compression spring 130 applies a downward bias or force on the upper spool 90 and the upper piston 86 secured thereto.
  • the abutment formed by the sleeve 124 limits the upward axial movement of the lower spring follower 134 and the upper compression spring 130.
  • a threaded adjustment screw 136 extends through a threaded opening at the top of the bonnet 84 and engages the upper spring follower 132. Longitudinal movement of the adjustment screw 136 adjusts the loading of the upper compression spring 130 under operating pressures.
  • a lock nut 138 is provided which secures or locks the adjustment screw 136 in its longitudinal position once a desired force is applied ' by the upper compression spring 130 to the upper spool 90.
  • a removable cap 140 covers the otherwise exposed top portion of the adjustment screw 136 to provide 1 protection thereto.
  • the cap 140 has internal threads
  • a suitable vent hole 142 is provided in the bonnet
  • the lower spool 92 has an intermediate body
  • seal 151 is provided at the lower body portion 145 and
  • a central bore 153 extends through the
  • control chamber 116 (best shown in FIGS. 4, 5A, and
  • the upper end of the lower spool 92 is sized larger than the bore 147 in the tail portion 93 of the upper spool 90 so that the inlet-valve disc 156 closes the inlet-valve seat 154 when the upper spool 90 is moved upwardly relative to the lower spool 92.
  • the vent assembly 88 includes a body 162.
  • a reduced diameter upper end of the vent-assembly body 162 is sized and shaped to be closely received in the lower portion of the main body bore 100.
  • An enlarged diameter region of the bore 100 is provided along the reduced diameter upper end of the body to form the vent chamber 114. Formed in this manner, the vent chamber 114 is generally tubular shaped.
  • a pair of spaced- apart seal members 168, 170 are carried by the upper end of the vent- assembly body 162 on opposite ends of the reduced diameter portion to provide a fluid-tight seal between the vent-assembly body 162 and the main body 82.
  • the lower spool 92 and the vent assembly 88 cooperate to form a vent valve 172 which regulates the flow of fluid between the control chamber 116 and the vent chamber 114.
  • the lower end of the tail portion forms a vent-valve disc or closure 174.
  • a vent-valve seat 176 is formed at a juncture of the bore 149 and an upper enlarged diameter portion 177 of the bore 149.
  • vent-valve disc 174 or the vent-valve seat 176 is preferably provided with a seal member, such as the illustrated O-ring, to provide a fluid-tight seal when 1 the vent-valve disc 174 closes the vent-valve seat 176.
  • an O-ring is held in an
  • a first vent passage 178 axially extends between
  • the passages 178 and 180 are sized and shaped
  • control chamber 116 is in fluid-flow
  • vent chamber 114 (as shown in FIGS 4 and 6A) .
  • the pilot valve 14 further includes a second or
  • the lower 0 compression spring 184 preferably acts between the 1 upper piston 86/upper spool 90 and the lower spool 92 2 to urge or bias them in opposite directions.
  • 34 184 is a helical compression spring and encircles a 5 portion of the lower spool 92 with a bottom end 6 directly engaging a flange 185 on the spool 92, and 7 with a top end directly engaging and encircling the pin u ⁇ u ⁇ ⁇ w j u> to t t to to to t to to H H H H -J cn oi tt- ⁇ to H o yD CO vj cn ui w to H o l-O 03 -J ⁇ > c ⁇ *- U t H O O CO cn ui ⁇ to
  • the upper 1 compression spring 130 is adjusted so that the system 2 pressure overcomes the downward force to upwardly move 3 the upper piston 86 and the upper spool 90 when the 4 system pressure increases to a predetermined pressure 5 greater than the desired system pressure or set 6 pressure as discussed in more detail hereinafter. 7 It is noted that when the upper piston 86 and the upper spool 90 are in their downwardmost position as just described, the lower compression spring 184 along with the pressure in the inlet chamber 112 upwardly urge the upper spool into engagement with the lower spring follower 134 and downwardly urge the lower spool 92 into engagement with the vent assembly 88. The lower compression spring 184 maintains the engagement between the lower spool 92 and the vent assembly 88 so that the vent valve 172 remains closed.
  • the control chamber 116 of the pilot valve 14 is also at system pressure because of fluid communication between the inlet chamber 112 and the control chamber 116 through the inlet valve 152 and the space between the bore 147 and the spool 92. No fluid communication is present between the control chamber 116 and the vent chamber 114, however, because the vent-valve disc 174 is closing the vent-valve seat 176.
  • the dome chamber 76 of the main valve 12 is also at system pressure because of fluid communication between the control chamber 116 of the pilot valve 14 and the dome chamber 76 through the control line 18.
  • An increase in fluid pressure in the pressure tank 52 to a level slightly below the set pressure results in an increase in system pressure in the inlet chamber 112 such that the pressure in the inlet chamber 112 acting on the effective area of the upper piston 86 equals the force of the upper compression spring 130. Any further increase in fluid pressure in the pressure tank and inlet chamber 112 causes upward movement of the upper piston 86 and the upper spool 90 because the downward force of the upper compression spring 130 is overcome.
  • vent- valve disc 174 As the vent- valve disc 174 is unseated, fluid in the control chamber 116 is released through the vent-valve seat 176, the first and second vent passages 178 and 180 of the vent assembly 88, and the second passage 120 of the main body 82 to the vent port 110. From the vent port 110, the fluid is discharged from the pilot valve 14 through the discharge line 20. Fluid in the dome chamber 76 of the main valve 12 is also released because the control chamber 116 is in fluid communication with dome chamber 76 through the control line. The rate which the fluid is vented depends upon the distance the upper spool 90 lifts the lower spool 92. As best seen in FIG.
  • the release of fluid from the dome chamber 76 of the main valve 12 out of the vent port 110 of the pilot valve 14 results in a depressurization of the dome chamber 76. Due to this pressure reduction, the fluid pressure in the inlet chamber 34 of the main valve 12 raises the piston 30 to an open or unseated position and thereby allows fluid to flow from the main valve inlet chamber 34 to the outlet chamber 36. This passage of fluid through the main valve 12 from the pressure tank 52 to the discharge pipe 58 reduces the pressure in the pressure tank 52, that is, the system pressure. Once the system pressure is reduced, the downward force of the upper compression spring 130 downwardly moves the upper piston 86 and the upper spool 90.
  • valve system 10 of the present invention provides a relatively small system hysteresis, that is, failure to exactly return the system pressure to the desired system pressure or overcorrection of the system pressure. This relatively small overcorrection, compared to prior art systems, reduces the amount of fluid discharged or lost to maintain the desired system pressure in the pressure tank 52.

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

Abstract

Un clapet pilote (14) comporte un corps présentant un canal qui y est formé, une chambre d'entrée (112) constituée le long du canal, un orifice d'admission (106) en communication avec la chambre d'entrée, un orifice de contrôle (108) communiquant avec le canal, et un évent (110) communiquant avec le canal. Un piston (86) est mobile au sein du canal en réaction à une pression fluidique à l'intérieur de la chambre d'entrée. Un premier tiroir est mobile à l'intérieur du canal et est rigidement fixé au piston pour se déplacer avec celui-ci. Un deuxième tiroir équilibré en pression est mobile à l'intérieur du canal et porte un disque de valve d'évacuation. Le deuxième tiroir présente une masse inférieure à celle du premier tiroir. Le deuxième tiroir porte également un disque de valve d'admission (156), qui coopère avec un siège de valve d'admission (154) porté par le premier tiroir en vue de réguler l'écoulement de fluide entre la chambre d'entrée et l'orifice de contrôle. Un siège de valve d'évacuation (76) est rigidement fixé au corps et coopère avec le disque de valve d'évacuation (174) porté par le deuxième tiroir en vue de réguler l'écoulement entre l'orifice de contrôle et l'évent. Un premier ressort (130) sollicite le premier tiroir dans une direction à l'encontre de la pression dans la chambre d'entrée. Un deuxième ressort (184) se trouve entre le piston et le deuxième tiroir de sorte que le piston agit sur le deuxième tiroir par l'intermédiaire du deuxième ressort pour fermer la valve d'évacuation lorsque la valve d'admission est ouverte.
PCT/US2001/028964 2000-09-19 2001-09-17 Soupape de surete actionnee par un clapet pilote WO2002038994A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001294572A AU2001294572A1 (en) 2000-09-19 2001-09-17 Pressure releif valve actuated by pilot valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66483700A 2000-09-19 2000-09-19
US09/664,837 2000-09-19

Publications (1)

Publication Number Publication Date
WO2002038994A1 true WO2002038994A1 (fr) 2002-05-16

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Application Number Title Priority Date Filing Date
PCT/US2001/028964 WO2002038994A1 (fr) 2000-09-19 2001-09-17 Soupape de surete actionnee par un clapet pilote

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WO (1) WO2002038994A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2938623A1 (fr) * 2008-11-18 2010-05-21 Rech S De L Ecole Nationale Su Canon deflagrateur comportant un piston mobile
EP2647894A1 (fr) * 2012-04-05 2013-10-09 The Boeing Company Soupapes de sûreté à pression positive et négative contrôlées par une soupape pilote
CN110030403A (zh) * 2019-04-15 2019-07-19 广东万和热能科技有限公司 一种燃气比例阀
CN110030412A (zh) * 2019-03-08 2019-07-19 哈电集团哈尔滨电站阀门有限公司 一种大口径多级先导式安全阀
CN111344494A (zh) * 2017-11-15 2020-06-26 五十铃自动车株式会社 油压控制阀
WO2021016471A1 (fr) * 2019-07-24 2021-01-28 Emerson Automation Solutions Final Control US LP Soupape pilote de chargement à dôme rapide
RU2745183C1 (ru) * 2020-07-23 2021-03-22 Юрий Иванович Духанин Система защиты для криогенных резервуаров, размещённых внутри корпуса подводного аппарата
RU2764340C1 (ru) * 2021-03-29 2022-01-17 Юрий Иванович Духанин Система защиты для криогенных резервуаров, размещённых внутри корпуса подводного аппарата
CN110030412B (zh) * 2019-03-08 2024-06-04 哈电集团哈尔滨电站阀门有限公司 一种大口径多级先导式安全阀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664362A (en) 1969-02-06 1972-05-23 Anderson Greenwood & Co Pilot valve
US4586533A (en) 1985-07-01 1986-05-06 Crosby Valve & Gage Company Non-flowing modulating pilot operated relief valve
US4609008A (en) * 1985-09-11 1986-09-02 Anderson-Greenwood Usa, Inc. Non-flowing pressure responsive pilot valve
EP0468621A1 (fr) * 1990-06-04 1992-01-29 Keystone International Holdings Corp. Soupape pilote pour soupape de réglage et mode opératoire
US7649398B2 (en) 2005-07-20 2010-01-19 Samsung Electronics Co., Ltd. Level shifter with single input and liquid crystal display device using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664362A (en) 1969-02-06 1972-05-23 Anderson Greenwood & Co Pilot valve
US4586533A (en) 1985-07-01 1986-05-06 Crosby Valve & Gage Company Non-flowing modulating pilot operated relief valve
US4609008A (en) * 1985-09-11 1986-09-02 Anderson-Greenwood Usa, Inc. Non-flowing pressure responsive pilot valve
EP0468621A1 (fr) * 1990-06-04 1992-01-29 Keystone International Holdings Corp. Soupape pilote pour soupape de réglage et mode opératoire
US7649398B2 (en) 2005-07-20 2010-01-19 Samsung Electronics Co., Ltd. Level shifter with single input and liquid crystal display device using the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2938623A1 (fr) * 2008-11-18 2010-05-21 Rech S De L Ecole Nationale Su Canon deflagrateur comportant un piston mobile
WO2010058093A1 (fr) * 2008-11-18 2010-05-27 Arts Canon deflagrateur comportant un piston mobile
EP2647894A1 (fr) * 2012-04-05 2013-10-09 The Boeing Company Soupapes de sûreté à pression positive et négative contrôlées par une soupape pilote
US9435449B2 (en) 2012-04-05 2016-09-06 The Boeing Company Pilot valve controlled positive and negative pressure relief valves
CN111344494A (zh) * 2017-11-15 2020-06-26 五十铃自动车株式会社 油压控制阀
CN110030412A (zh) * 2019-03-08 2019-07-19 哈电集团哈尔滨电站阀门有限公司 一种大口径多级先导式安全阀
CN110030412B (zh) * 2019-03-08 2024-06-04 哈电集团哈尔滨电站阀门有限公司 一种大口径多级先导式安全阀
CN110030403A (zh) * 2019-04-15 2019-07-19 广东万和热能科技有限公司 一种燃气比例阀
CN110030403B (zh) * 2019-04-15 2024-06-07 广东万和热能科技有限公司 一种燃气比例阀
WO2021016471A1 (fr) * 2019-07-24 2021-01-28 Emerson Automation Solutions Final Control US LP Soupape pilote de chargement à dôme rapide
CN114144609A (zh) * 2019-07-24 2022-03-04 艾默生自动化解决方案终控美国公司 快速圆顶加载先导阀
US11550344B2 (en) 2019-07-24 2023-01-10 Emerson Automation Solutions Final Control US LP Quick dome loading pilot valve
RU2745183C1 (ru) * 2020-07-23 2021-03-22 Юрий Иванович Духанин Система защиты для криогенных резервуаров, размещённых внутри корпуса подводного аппарата
RU2764340C1 (ru) * 2021-03-29 2022-01-17 Юрий Иванович Духанин Система защиты для криогенных резервуаров, размещённых внутри корпуса подводного аппарата

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