US3568706A - Pressure relieving system - Google Patents

Pressure relieving system Download PDF

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Publication number
US3568706A
US3568706A US3568706DA US3568706A US 3568706 A US3568706 A US 3568706A US 3568706D A US3568706D A US 3568706DA US 3568706 A US3568706 A US 3568706A
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US
United States
Prior art keywords
pressure
valve
fluid
pilot valve
inlet
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Expired - Lifetime
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English (en)
Inventor
Irvin B Weise
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Anderson Greenwood and Co
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Anderson Greenwood and Co
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    • 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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • 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
    • F16K17/0473—Multiple-way safety valves
    • 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
    • F16K17/105—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 using choking or throttling means to control the fluid operation of the main valve
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/024—Controlling the inlet pressure, e.g. back-pressure regulator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2564—Plural inflows
    • Y10T137/2567—Alternate or successive inflows
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type
    • Y10T137/7769—Single acting fluid servo

Definitions

  • the present invention relates to an improved relieving system, to an improved pilot valve for controlling a relief system and to a pressure responsive device preventing reverse flow of fluid through the relief valve.
  • This invention is an improvement on the system and structure disclosedin my prior copentling application Ser. No. 7 l l ,821 filed Feb. 19, 1968.
  • An object of the present invention is to provide an improved pressurerelieving system in which the outlet of the main valve may be connected into a header with assurance that the main valve will not open to allow reverse flow therethrough when the header pressure exceeds the main valve inlet pressure.
  • Another object is to provide an improved pilot valve for a pressure-relieving system whose setting may be tested with a testing fluid after it has been installed in controlling position on a relief valve without having the testing fluid flow through the pilot fluid supply line.
  • a further object is to provide an improved pilot valve suitable for use on liquids and gases which includes a check valve to prevent back flow through .the fluid supply line and eliminates the possibility of the inlet valve and check valve both closing and being held closed by pressure of fluid trapped therebetween.
  • Still another object of the present invention is to provide an improved pressure responsive device adapted to be used with a pressure-relieving valve to prevent the valve from opening when the valve is subjected to higher pressures at its outlet than at its inlet.
  • a still further object is to provide an improved pressure-relieving system which may be set for a preselected relieving pressure and also for a preselected blowdown independent of the relieving pressure setting.
  • Another object is to provide as a subcombination in an improved pressure-relieving system a pressure responsive device to be used with the pressure-relieving system which applies the higher of two fluid pressures to a pressure responsive member in the system.
  • FIG. I is a schematic diagram of the improved relieving system of the present invention.
  • FIG. 2 is a detailed sectional view of the improved pilot valve of the present invention and schematically illustrating the equipment for testing the pilot .valve relief setting.
  • H6. 3 is an enlarged detailed sectional view of the improved'pilot valve showing the inlet valve member in seated position.
  • FIG. 4 is a partial sectional view of the improved back flow preventer of the present invention.
  • FIG. 5 is a sectional view taken along line 5-5 in FIG. 4 showing the cross-sectional configuration of the pressure responsive member of the improved back flow preventer of the present invention.
  • the improved pressure-relieving system of the present invention is installed to protect tank T from over pressure conditions.
  • the main relief valve R is connected to have its inlet Iii in communication with the interior of the tanlr T and has its outlet 12 connected to a suitable disposal line L which may be a manifold or header of outlets from several pressure-relieving systems (not shown).
  • the main valve R includes a valve member l4 controlling the flow therethrough responsive to the pressure delivered to the pressure responsive member 116.
  • Main valve R may be of any suitable type which includes a pressure responsive means actuating the valve member tocontrol the flow through the main valve. With valve R pressure on the pressure responsive member 16 is used to hold valve member I4 in closed position and when the pressure is vented from member I6, the pressure in inlet 10 causes valve member M to open. 7
  • the improved pilot valve is supplied with fluid under pressure from the tank T by the line 18 which connects from inlet 10 to the pilot valve P.
  • Control pressure is supplied by pilot valve P through the line 20 and the back flow preventer 22 to the pressure responsive member 16 of main valve R.
  • the pilot valve. P controls the venting of tank T through the main valve R.
  • line 24 connects from outlet 12 to the back fiow preventer 22 to cause the main valve R to close or remain closed whenever the pressure in the disposal line L rises to a pressure above the pressure at the inlet 10 to thereby prevent flow of fluids through the main valve R in the reverse direction.
  • the pilot valve I is also provided with a vent port 26 through which fluid pressure in pressure responsive member 16 is vented to allow the main valve to open and relieve pressure within tank T.
  • Pilot valve P is shown in greater detail in FIGS. 2 and 3.
  • Pilot valve P includes the body 28 in which a central bore 30 is formed with a plurality of ports communicating with bore 30 as hereinafter described.
  • the shoulder 32 projecting into the bore 30 receives the valve seat assembly 34 which is held on shoulder 32 by the cage 36 and the bonnet 38.
  • the cage 40 supports the seat. insert 42 within the central bore 30 and is adjustable axially of bore 30 as hereinafter described. Communication through the central bore 30 is first through the back check seat 44 defined within the interior of cage 40, the second seat 46 defined by seat insert 42 and the outlet seat 48 defined by the seat assembly 34.
  • the cage 40 is sealed against the walls.
  • inlet ports 54 and 56 both communicate with the inlet chamber 52, inlet port 54 being provided with a filter screen 58 and inlet port 56 being an alternate communication into inlet chamber 52 and normally closed by the plug 60.
  • Control ports 62 and 64 both communicate with intermediate chamber 66 between seats 46 and 68. Port 64 is normally closed but is provided to allow testing of the pilot valve I after it has been installed in position controlling the relief valve R as hereinafter explained.
  • Outlet or vent port 68 communicates with outlet chamber 70. Ports 72 and 74 through cage 36 probide communication between the interior of cage 36 and outlet chamber 70. The port 76 extends through cage 36 to provide communication between the interior of bonnet 38 and the interior of cage 36.
  • valve member 78 which is slidably mounted within cage 36 controls the flow through valve seat 413 responsive to the pressure forces exerted thereon and the force of the adjustable biasing means (spring 86).
  • Spring 86 is adjustable by the threading of screw 82 through bonnet 38.
  • Lock nut 86 is provided to retain screw 82 in its-preselected position and cap 36 engages bonnet 36 and covers the outer end of screw 82 and lock nut 84.
  • valve member 90 Flow from the inlet chamber 52 to the intermediate chamber 66 is controlled by valve member 90 which is slidably mounted within bore 92 of cage 40 and movable between seats 44 and d6 responsive to the pressure differential across valve member 90.
  • Valve member 96 is preferably closely spaced with respectto the wall of bore 92 to provide a restriction to the flow of fluid through bore 92 around valve member 96. It as been found that if valve member fill has a polygonal cross-sectional shape such as a hexagon, the points of the polygon engage the walls of bore 92 to guide the movement of valve member 90 in the bore 92 and the restricted flow area is provided between the flats of the hexagon and the wall of the bore 92.
  • the valve member 90 includes the body 91, the sealing ring 94 which is adapted to engage seat 44 when valve member 90 is in its lower position and the sealing ring 96 held in place by the tubular retainer 98 which sealing ring 96 is adapted to engage the seat 46 as best shown in FIG. 3 when valve member 90 is in its upper position.
  • seal ring 94 may be omitted so that valve member 90 does not seal on seat 44.
  • Tubular retainer 98 is positioned within the bore 100 defined in body 91, includes the annular flange 102 which projects radially outwardly and is adapted to engage the sealing ring 96 to support it in position for sealing engagement with valve seat 46.
  • valve member 90 thus is the inlet valve when seated on seat 46 and the back check valve when seated on seat 44. Valve member 90 when seated on seat 46 is held by pressure differential to assure that it also cannot engage seat 44.
  • the two piece construction of valve member 90 may be eliminated in favor of a single piece and a relatively firm O-ring 96 which would not require pressure equalization during flow.
  • the spacer rod 104 is positioned between the two valve members 78 and 90.
  • Rod 104 extends through both valve seats 46 and 48 and is closely spaced with respect to the valve seats to provide a flow restriction to the fluids flowirg through these two annular passages.
  • the engagement of spacer rod 104 with valve member 78 is within the bore 106 defined in member 78 to allow some relative movement between the valve members 78 and 90 while assuring that both valve members are not seated at the same time.
  • the length of rod 104 is preselected with respect to the distance between the seated position of valve member 78 on seat 48 and the seated position of valve member 90 on seat 46 to assure that both are not closed at the same time.
  • valve members 78 and 90 are each larger than the area of valve seat 46.
  • the cross-sectional area of rod 106 is significantly smaller than the area of either seat 46 or seat 48 so that it is ineffective as a force developing member.
  • valve seat 46 is adjustable with respect to valve seat 48 to provide a blowdown control adjustment.
  • This adjustment is provided by the threaded engagement of the lower or projecting end of cage 40 in bushing 108.
  • Lock nut 110 is provided to secure the cage 40 in its preselected position.
  • shim 112 is positioned between the shoulder 114 on cage 40 and the inner end of bushing 108. The thickness of the shim 112 is preselected to assure that seats 46 and 48 are not spaced-apart a sufficient distance so that both may be closed at the same time.
  • the outer end of cage 40 is provided with flats to allow cage 40 to be turned with a wrench or a suitable handle.
  • the testing system shown in FIG. 2 includes a test pressure source or tank 116 and a pressure gauge 118.
  • Valve 120 connects into alternate port 64 and flow lines connect between valve 120 and pressure gauge 118 and also through valve 122 to tank 116 as shown. With the testing system connected as shown, valve 120 is opened first and valve 122 is then opened gradually to pressurize intermediate chamber 66. This pres sure is registered on gauge 118. By increasing the pressure until valve member 78 lifts off valve seat 48 to vent chamber 66, the opening setting of pilot valve P may be checked and reset if needed. During the time that the pressure in intermediate chamber 66 exceeds the pressure in inlet chamber 52, valve member Is held in seated position on seat 44 to prevent test fluid from flowing back into the supply system.
  • back flow preventer 22 functions as a switching valve to direct the greater of the two fluid pressures to the pressure responsive means 16.
  • Back flow preventer 22 has a T-shaped body 124 and includes a double-acting valve member 126. The branch leg of body 124 is threaded for connection into main valve R.
  • connection of line 20 to back flow preventer 22 is provided into one of the aligned legs of body 124 by the bushing 128 which also defines the inwardly facing valve seat 130.
  • Line 24 is connected into the other of the aligned legs of body 124 by bushing 132 which defines inwardly facing seat 134.
  • valve member 126 is positioned within body 124, responsive to the pressures exerted on opposite ends thereof and coacts with seats and 134 to provide communication to main valve R from line 20 or line 24 whichever has the higher pressure.
  • the valve member 126 includes a cylindrical body 136 with heads 138 and 140 at each end of body 136.
  • Head 138 supports the seal ring 142 which in one position of member 126 engages seat 130 to seal off flow from line 20.
  • Head 140 supports seal ring 144 which in the other position of valve member 126 engages seat 134.
  • Heads 138 and 140 are preferred to be generally polygonal shaped in cross section. As shown, the heads 138 and 140 are square shaped with rounded comers and terminate in a frustoconical portion supporting the seal rings 142 and 144. As best seen in FIG. 5, the rounded corners of the heads guide the valve member 126 in its axial movement by engagement with the walls of the bores in bushings 128 and 132.
  • the heads provide sufficient restriction to flow of fluids through the spaces between the head flats and the walls of the bushing bores to cause movement of the valve member 126 to the other seat responsive to changes in the pressures delivered to bushings 128 and 132.
  • the back flow preventer 22 functions to assure that the pressure responsive member 16 in main valve R is exposed to the fluid pressure in line 20 or line 24 whichever is higher.
  • valve member 90 In operation, the pressure fluid from inlet 10 is supplied to inlet port 54 and inlet chamber 52 of pilot valve P.
  • valve member 90 When the valve member 90 is disengaged from both seats 44 and 46 fluid flows around valve member 90 into intermediate chamber 66.
  • Port 62 and line 20 communicate from chamber 66 to back flow preventer 22 and supply fluid to the pressure responsive member 16 of valve R to hold valve member 14 in closed position.
  • Member 16 has a greater effective pressure area than valve member 14 to assure that valve R is closed when inlet pressure is delivered through pilot valve P and back flow preventer 22 to pressure responsive member 16.
  • valve member 78 The fluid pressure in intermediate chamber 66 is exerted on the exposed portion of valve member 78 through seat 48.
  • the force exerted by spring 80 is adjusted to allow valve member 78 to lift off seat 48 at the maximum pressure which is desired in tank T.
  • valve member 78 cracks open, it snaps to its full open position because of the increased area of valve member exposed to the pressure in intermediate chamber 66 and the flow through valve seat 48 causes a flow past valve member 94 ⁇ tourge valve member 90 toward closed position and exert a force on valve member 7% by the connection of rod 164 urging valve member 78 toward full open position.
  • valve member 78 When valve member 78 is fully open, valve member 9% engages seat 46 to shut off the inlet supply of fluid.
  • the pressure control fluid in valve R is vented through valve seat and out vent port 6%. With the reduced control, pressure valve member l4 opens to relieve the pressure in tank T.
  • Control of blowdown or closing pressure is controlled by the adjustment of the position of seat 46 in relation to seat 4L8.
  • the effectiveness of such control is explained in my aforementioned patent application.
  • Such control is accomplished by loosening lock nut lllfl and rotating cage 40 within bushing
  • seat 46 is moved closer to seat 48 providing a greater lift of valve member 78 to cause valve member 96) to engage seat 46 thereby compressing spring 80 so that the force exerted by spring 80 toward closing is greater.
  • valve seats 46 and 48 closer together the closing pressure of valve member 7 8 is higher than the closing pressure when valve seats 46 and 48 are spaced farther apart.
  • the closing pressure of valve member 78 is preselected to provide the desired blowdown of tank T before valve R closes. This adjusting of blowdown has no effect on the opening setting of pilot valve Psince the force exerted by spring 80 on valve member 78 when valve member 78 is seated remains the same regardless of the position of seat 46.
  • the closing of seat 48 and the opening of flow through seat 46 is responsive to, the pressure forceon valve member 90 and the spring force exerted by spring 80.
  • the restriction to flow in the areas around rod 106 through the seats 46 and 48 creates a restriction to flow which causes valve 90 to snap away from seat 46 once it cracks open and also causes valve member 78 to snap to closed position on seat 48.
  • This restriction creates a slight increasein back pressure on valve member 96 as it first opens to provide some additional opening force which is suffrcient to snap valve member so open.
  • valve 90 The restriction between valve 90 and bore 92 is particularly important to the operation of pilot valve P when it is set to handle gas and liquid is supplied through line 18. Such condi-' tions can occur in propane or butane systems and it is important that the pilot valve P function properly to cause the system to be relieved at the preselected relieving pressure when exposed to either gas or liquid. With liquid in pilot valve l, as valve member 73 cracks open, flow around valve member 90 creates a small pressure drop to produce an added force-lifting valve member 78 to snap it to full open position.
  • the improved pressure-relieving system is responsive-to pressure in the pressure vessel and in the discharge line so that the system vents the pressure vessel to the discharge line when the pressure in the vessel reaches a preselected pressure but the system functions to assure that there is no communication between the vessel and the discharge line when the pressure in the discharge line increases to a level above the pressure in the vessel.
  • the improved pilot valve may be tested after it is installed in a pressure-relieving system without danger of the testing fluid leading back into the pressure system.
  • the pressure-relieving system of the present invention is adaptable for relieving pressure of a gas or a liquid in a pressure vessel
  • the foregoing disclosure and description of the invention are illustrative and explanatory thereof, and various changes in the size, shape and materials, as well as inthe details of the illustrated construction, may be made within the scope of the appended claims without departing from the spirit of the invcntion.
  • a pressure relieving system for a fluid pressure container comprising:
  • main relieving valve having an inlet connected to the fluid pressure container to be protected, an outlet and pressure responsive means for controlling flow between said inlet and said outlet;
  • pilot valve having an output of control pressure fluid (pressure) responsive to the pressure in said fluid pressure containers;
  • a fluid flow switching device connected (to) between said pressure responsive means of said main valve and said outlet of said main valve and between said main valve pressure responsive means and said pilot valve control pressure fluid outlet to deliver the greater of fluid pressure to said pressure responsive means from said pilot valve output and from the outlet of said main valve;
  • a pressure relieving system including;
  • a pressure relieving system for a fluid pressure container comprising;
  • said main valve having an inlet connected to a fluid pressure container, an outlet and pressure responsive means for controlling flow between said inlet and said outlet;
  • pilot valve having an output of control pressure fluid (pressure) responsive to the pressure in said fluid pressure container;
  • said back flow preventer having a pressure responsive valve member being actuated to move responsive to the pressure in each of said connecting means to close communication between said pressure responsive means and. the one of said connecting means having the lowest fluid pressure whereby said pressure responsive means is maintained in communication with the one of said connecting means having the highest fluid pressure.
  • a pressure relieving system for a fluid pressure container comprising:
  • said main valve having an inlet connected to the fluid pressure container to be protected, an outlet and pressure responsive means for controlling flow between a said inlet and said outlet;
  • pilot valve having an inlet valve and a vent valve, means supplying pressure fluid to said pilot valve from said fluid pressure container;
  • pilot valve having an inlet, a control port, a vent outlet, a vent valve controlling flow from said control port to said vent outlet, and an inlet valve seating in response to flow from said inlet to said control port upon opening of said vent valve;
  • pilot valve having (an) a control port output of fluid pressure responsive to the pressure in said fluid pressure container;
  • pilot valve also having a connection means for the connection of a test line therein;
  • pilot valve inlet having a back flow valve seat coacting with said inlet valve whereby pressure fluid from said test pressure source is prevented from flowing through said supply means to said fluid pressure container.

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  • 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)
  • Power Engineering (AREA)
  • Safety Valves (AREA)
  • Control Of Fluid Pressure (AREA)
US3568706D 1969-02-06 1969-02-06 Pressure relieving system Expired - Lifetime US3568706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79696169A 1969-02-06 1969-02-06

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US3568706A true US3568706A (en) 1971-03-09

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US3568706D Expired - Lifetime US3568706A (en) 1969-02-06 1969-02-06 Pressure relieving system

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US (1) US3568706A (ru)
JP (1) JPS506055B1 (ru)
DE (1) DE1927704C3 (ru)
GB (1) GB1266511A (ru)

Cited By (21)

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US3726301A (en) * 1970-12-21 1973-04-10 Lonergan J Co Pilot valve
DE2953106A1 (de) * 1978-09-18 1981-01-29 Vapor Corp Pilot operated relief valve
DE3129346A1 (de) * 1980-07-25 1982-08-05 Vapor Corp., 60648 Chicago, Ill. Gegendruckgesteuertes entlastungsventil mit neuartiger dichtungsanordnung
DE3204213A1 (de) * 1980-09-17 1982-09-09 Vapor Corp., 60648 Chicago, Ill. Servobetaetigtes ueberdruckventil
US4355657A (en) * 1978-09-18 1982-10-26 Vapor Corporation Pilot operated relief valve
FR2510705A1 (fr) * 1981-04-06 1983-02-04 Vapor Corp Valve pilote pour l'actionnement d'une soupape de decharge
US4384590A (en) * 1981-06-03 1983-05-24 Crosby Valve & Gage Company Pressure responsive pilot valve
US4586533A (en) * 1985-07-01 1986-05-06 Crosby Valve & Gage Company Non-flowing modulating pilot operated relief valve
GB2193349A (en) * 1986-02-26 1988-02-03 Leonard William Lamburn Relief/safety valves
US6161571A (en) * 1999-05-14 2000-12-19 The Living Trust of Eleanor A. Taylor Modulating relief valve
US6161570A (en) * 1999-06-01 2000-12-19 Tyco Flow Control, Inc. Pilot-operated relief valve
US6192924B1 (en) 2000-01-19 2001-02-27 Tyco Flow Control, Inc. Pilot operated relief valve
US6612536B2 (en) * 2000-10-04 2003-09-02 Martin Walter Dalton Remote shut-off valve
US6769880B1 (en) 2002-09-19 2004-08-03 Mangonel Corporation Pressure blowdown system for oil injected rotary screw air compressor
US20140090725A1 (en) * 2012-09-28 2014-04-03 Emerson Process Management Regulator Technologies, Inc Pilot operated relief valve with dual pilot regulators
US20140318642A1 (en) * 2013-04-25 2014-10-30 Spectron Gas Control Systems GmbH Safety device for installation in a gas-supply system, in particular, an acetylene-supply system
CN108708999A (zh) * 2018-07-13 2018-10-26 四川长仪油气集输设备股份有限公司 一种低压先导式安全阀
US20210364091A1 (en) * 2019-04-23 2021-11-25 Gaither Tool Company, Inc. Rapid Opening Gas Valve
US11306838B2 (en) * 2020-03-27 2022-04-19 Dresser, Llc Pilot-operated pressure relief valve nozzle
US20220205548A1 (en) * 2020-12-28 2022-06-30 Neptune Technology Group Inc. Oscillating valve
US20220282794A1 (en) * 2021-03-03 2022-09-08 Neptune Technology Group Inc. Diaphragm valve formed using additive manufacture

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CH596485A5 (ru) * 1975-08-20 1978-03-15 Sulzer Ag
DE69831613T2 (de) 1998-07-16 2006-06-14 Renner Herrmann Sa Flüssigkeitsmischvorrichtung
DE102005034619B3 (de) 2005-07-19 2007-02-08 Carl Zeiss Vision Gmbh Verfahren und Vorrichtung zum Prüfen des Nachtsehens

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GB286903A (en) * 1927-04-11 1928-03-15 Robert Arnold Blakeborough Improvements in means for preventing reverse flow in pipe lines
US2609832A (en) * 1946-07-06 1952-09-09 Merton J Smith Fluid pressure regulator
US2661023A (en) * 1943-05-29 1953-12-01 Clayton Manufacturing Co Fluid pressure-operated valve
US3010691A (en) * 1959-12-16 1961-11-28 Automatic Switch Co Pilot operated valve
US3294111A (en) * 1965-06-01 1966-12-27 Us Industries Inc Relief valve
US3373763A (en) * 1963-01-04 1968-03-19 American Brake Shoe Co High speed valves

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DE506090C (de) * 1930-08-30 Schweizerische Lokomotiv Druckregler mit Servomotor
DE1202545B (de) * 1962-07-21 1965-10-07 Ludwig Rexroth Druckregler

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Publication number Priority date Publication date Assignee Title
GB286903A (en) * 1927-04-11 1928-03-15 Robert Arnold Blakeborough Improvements in means for preventing reverse flow in pipe lines
US2661023A (en) * 1943-05-29 1953-12-01 Clayton Manufacturing Co Fluid pressure-operated valve
US2609832A (en) * 1946-07-06 1952-09-09 Merton J Smith Fluid pressure regulator
US3010691A (en) * 1959-12-16 1961-11-28 Automatic Switch Co Pilot operated valve
US3373763A (en) * 1963-01-04 1968-03-19 American Brake Shoe Co High speed valves
US3294111A (en) * 1965-06-01 1966-12-27 Us Industries Inc Relief valve

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726301A (en) * 1970-12-21 1973-04-10 Lonergan J Co Pilot valve
DE2953106A1 (de) * 1978-09-18 1981-01-29 Vapor Corp Pilot operated relief valve
US4355657A (en) * 1978-09-18 1982-10-26 Vapor Corporation Pilot operated relief valve
DE3129346A1 (de) * 1980-07-25 1982-08-05 Vapor Corp., 60648 Chicago, Ill. Gegendruckgesteuertes entlastungsventil mit neuartiger dichtungsanordnung
DE3204213A1 (de) * 1980-09-17 1982-09-09 Vapor Corp., 60648 Chicago, Ill. Servobetaetigtes ueberdruckventil
FR2510705A1 (fr) * 1981-04-06 1983-02-04 Vapor Corp Valve pilote pour l'actionnement d'une soupape de decharge
US4384590A (en) * 1981-06-03 1983-05-24 Crosby Valve & Gage Company Pressure responsive pilot valve
US4586533A (en) * 1985-07-01 1986-05-06 Crosby Valve & Gage Company Non-flowing modulating pilot operated relief valve
GB2193349A (en) * 1986-02-26 1988-02-03 Leonard William Lamburn Relief/safety valves
GB2193349B (en) * 1986-02-26 1990-10-03 Leonard William Lamburn A means applied to fluid pressure protected systems, to ensure relief and/or safety (r/s)valve preset pneumatic assistance, irrespective of preset valve lift
US6161571A (en) * 1999-05-14 2000-12-19 The Living Trust of Eleanor A. Taylor Modulating relief valve
US6161570A (en) * 1999-06-01 2000-12-19 Tyco Flow Control, Inc. Pilot-operated relief valve
WO2002005050A1 (en) * 1999-06-01 2002-01-17 Tyco Flow Control, Inc. Pilot-operated relief valve
US6192924B1 (en) 2000-01-19 2001-02-27 Tyco Flow Control, Inc. Pilot operated relief valve
US6612536B2 (en) * 2000-10-04 2003-09-02 Martin Walter Dalton Remote shut-off valve
US6769880B1 (en) 2002-09-19 2004-08-03 Mangonel Corporation Pressure blowdown system for oil injected rotary screw air compressor
US9334974B2 (en) * 2012-09-28 2016-05-10 Emerson Process Management Regulator Technologies, Inc. Pilot operated relief valve with dual pilot regulators
US20140090725A1 (en) * 2012-09-28 2014-04-03 Emerson Process Management Regulator Technologies, Inc Pilot operated relief valve with dual pilot regulators
US10119623B2 (en) 2013-04-25 2018-11-06 Spectron Gas Control Systems GmbH Safety device for installation in a gas-supply system, in particular, an acetylene-supply system
US9448565B2 (en) * 2013-04-25 2016-09-20 Spectron Gas Control Systems GmbH Safety device for installation in a gas-supply system, in particular, an acetylene-supply system
US20140318642A1 (en) * 2013-04-25 2014-10-30 Spectron Gas Control Systems GmbH Safety device for installation in a gas-supply system, in particular, an acetylene-supply system
CN108708999A (zh) * 2018-07-13 2018-10-26 四川长仪油气集输设备股份有限公司 一种低压先导式安全阀
CN108708999B (zh) * 2018-07-13 2024-02-13 四川长仪油气集输设备股份有限公司 一种低压先导式安全阀
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US11306838B2 (en) * 2020-03-27 2022-04-19 Dresser, Llc Pilot-operated pressure relief valve nozzle
US20220205548A1 (en) * 2020-12-28 2022-06-30 Neptune Technology Group Inc. Oscillating valve
US12078256B2 (en) * 2020-12-28 2024-09-03 Neptune Technology Group Inc. Oscillating valve
US20220282794A1 (en) * 2021-03-03 2022-09-08 Neptune Technology Group Inc. Diaphragm valve formed using additive manufacture

Also Published As

Publication number Publication date
DE1927704C3 (de) 1973-11-22
GB1266511A (ru) 1972-03-08
JPS506055B1 (ru) 1975-03-10
DE1927704B2 (de) 1973-05-03
DE1927704A1 (de) 1970-09-03

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