Abstract: A valve for a fluid, comprising: a body with an inlet, an outlet and a passage fluidly interconnecting the inlet and outlet; a shut-off device housed in the body and configured for selectively opening and closing the passage, the shut-off device comprising a main seat, a main closing element forming a channel extending there through and a pilot seat, a pilot closing element housed in the main closing element, a first compression spring, and a second compression spring; an actuating device of the shut-off device. The second compression spring is operatively mounted between the main closing element and the body and the first compression spring is stronger than the second compression spring.

Abstract: Provided is a fluid control solenoid valve including: a valve body; a valve seat mounted on a lower portion thereof; a coil mounted on an outer circumferential surface thereof and to which power is applied; a core mounted on an inner surface thereof; a lower plunger movably disposed on the inner surface thereof and formed with an orifice and integrally formed with a tight contact portion to be in tight contact with the valve seat on a bottom surface thereof; and an actuating unit arranged to be linearly moved on an upper side of the lower plunger, actuated by interlocking the lower plunger and formed with an actuating rod which is linearly moved and which is in close contact with the orifice. A fluid flow delay unit is provided on an outer surface of the lower plunger to generate pressure difference between upper and lower portions of the lower plunger.

Abstract: A first relief valve chamber (3) of a main relief valve (10) and a second relief valve chamber (7) of an auxiliary relief valve (11) are provided in series in a valve case 1. The first relief valve chamber (3) includes a valve seat chamber (4) at the right and a valve chamber (5) at the left. A first valve member (30) in the valve chamber (5) is biased toward a valve seat member (18) in the valve seat chamber (4) by a first relief spring (40). A second valve member (48) in the second relief valve chamber (7) is biased toward a second valve seat (47) by a second relief spring (50).

Abstract: A device for regulating flow rate of a gas in a duct, the device including a valve member having an actuator, the valve member being configured in such a manner as to shut off the duct selectively, wherein movement of the valve member is controlled by the resultant firstly of pressure in the duct upstream from the valve member acting on a proximal surface of the valve member, and secondly of a control pressure applied to a distal surface of the valve member of area greater than that of the proximal surface of the valve member, the control pressure being established in an amplification chamber having a feed line and an emptying line, one of the feed and emptying lines presenting a flow rate that is constant and the other presenting a flow rate that is variable and that is controlled by an actuator.

Abstract: A fluid regulator having a valve body defining an inlet, an outlet, a loading port, an access port, and a loading chamber disposed within the valve body and coupled to the loading port. A valve assembly is at least partially disposed between the inlet and the outlet and in communication with the loading chamber and is adapted to cooperate with the loading chamber to adjust fluid flow at the outlet by adjusting a fluid flow rate between the inlet and the outlet. A restrictor is at least partially disposed within the access port and the loading chamber and the valve assembly are adapted to be responsive to a change in loading pressure such that a modified rate is achieved and the restrictor is adapted to adjust a response speed in which the modified rate is achieved.

Abstract: A relief valve includes a valve body having an inlet and an outlet; a passageway formed between the inlet and the outlet in the valve body; a valve tube positioned in the passageway having a generally cylindrical portion including a first outside diameter and a second generally cylindrical portion including a first inside diameter that is larger than the first outside diameter; a valve seat; and a spring positioned about at least a portion of the valve tube and biasing the valve tube away from the valve inlet to seal against the valve seat. The valve tube and valve seat prevent flow through the passageway when pressure at the inlet is below a predetermined pressure and wherein the valve tube moves axially away from the valve seat at the predetermined pressure allowing flow through the passageway from the inlet to the outlet.

Abstract: The invention relates to a central valve for a pivot motor actuator. A housing tube of the central valve includes radial recesses for operating connections. A piston of the central valve has a center position. In the center position both radial recesses are covered by annular bars of the piston towards the tank drain connection by overlaps. Thus, pressure spikes from the operating connections to the check valves are strongly throttled.

Abstract: A proportional throttle valve includes a valve piston (2) displaceably guided in the longitudinal direction in a valve housing (3) having a fluid inlet (4) and a fluid outlet (5) and pretensioned by an energy accumulator, in particular in the form a pressure spring, against a stroke stop (6) defining the closure position. A pressure limiting valve (7) is integrated in the proportional throttle valve (1). The side (8) of the valve piston (2) to allow the piston to move away from the stroke stop (6) in opposition to the pretensioning force when a predefinable pressure is exceeded at the fluid inlet (4).

Abstract: A gas supply system includes a receiver assembly, a gas storage vessel coupled to the receiver assembly, a main poppet positioned at an end of the gas storage vessel and sealing the gas storage vessel when the main poppet is closed, a pilot poppet positioned in the main poppet and sealing the gas storage vessel when the pilot poppet is closed, and a chamber positioned behind the main poppet, wherein when the pilot poppet opens, gas from the gas storage vessel is released into the chamber to exert pressure on the main poppet to open the main poppet.

Abstract: Internal valve apparatus are described. An example internal valve includes a body having a valve seat disposed between an inlet and an outlet. A flow control member operatively coupled to the body moves between a first position in which the flow control member engages the valve seat to restrict the flow of fluid through the valve and a second position in which the flow control member is spaced from the valve seat to allow the flow of fluid through the valve. The example internal valve further includes a removable actuation member disposed within the body and responsive to a fluid pressure to cause the flow control member to move between the first and second positions.

Abstract: The invention relates to a relief valve comprising a first valve body for opening and closing a fluid passageway between a first valve connection and a second valve connection, a second valve body which is disposed on the first valve body and is used for opening and closing a valve passageway located between the first valve connection and a valve interior, a one throttle duct between the valve interior and a face of the first valve body, a spring for opening the second valve body, and an actuator for closing the second valve body. This relief valve further comprising a movable member that can be moved further in the same direction once the second valve body has been closed, thus allowing the first valve body to be opened by having the second valve body engage a valve seat located on the first valve body, and a stop element connected to the second valve body and/or the movable member engages the first valve body via the spring to close the first valve body.

Abstract: A housing has a compression chamber and a first passage, through which the compression chamber communicates with an accumulation chamber. A discharge valve is provided in the first passage and configured to open to supply fuel from the compression chamber to the accumulation chamber in response to increase in pressure in the compression chamber. A second passage is configured to communicate the accumulation chamber with the compression chamber via the discharge valve. A valve element allows fuel flow from the accumulation chamber to the compression chamber. A biasing unit biases the valve element to seat the valve element on a valve seat of the second passage. The sidewall of the valve element and the inner wall defining the second passage therebetween define a throttle midway through the second passage for restricting fuel flow from the accumulation chamber to the compression chamber.

Abstract: In accordance with the present invention, there is provided a bi-directional shut-off trim for a valve which possesses the functional attributes of a pilot operated trim and a balanced trim through the integration of a spring loaded check valve into a pilot trim. In forward flow isolation, the bi-directional shut-off trim of the present invention acts as a normal pilot operated trim. In reverse flow, the check valve of the shut-off trim opens to balance the pressure on either side of the plug thereof.

Abstract: A suction valve for a pipe line in which a medium flows is provided, whereby the flow can be closed and regulated and whereby back flow prevented. The suction valve includes a movable a closing mechanism (3) placed in a valve house (1), and an opposed counter face in the valve house. The closing mechanism (3) can be moved by the pressure of the medium flow by forming the closing mechanism (3) to be as piston parts or cylinder parts in a working cylinder. The pressure of the medium flow used for moving the closing mechanism (3) is led into the closing mechanism through an outlet valve (8,9,10), which outlet valve is fitted inside the closing mechanism (3).

Abstract: A flow control valve includes a pressure compensating valve and a first switching valve. The pressure compensating valve is configured to enlarge an opening area of a variable orifice between a load pressure line and a compensating pressure line when a pressure of working fluid of the compensating pressure line is smaller than a first set pressure, and narrow the opening area of the variable orifice when the pressure of the working fluid of the compensating pressure line is larger than the first set pressure. The first switching valve is configured to switch between a meter-out operation and a neutral operation by an external operation, wherein the working fluid of the compensating pressure line is drained in the meter-out operation, the working fluid of the compensating pressure line is not drained in the neutral operation. The load pressure line guides the working fluid to be supplied to an actuator.

Abstract: The present invention describes, generally, a method and system for controlling the dynamics of an actuatable load functioning or operable within a servo or servo-type system, wherein the dynamics of the load are controlled by way of a unique asymmetric pressure control valve configured to provide intrinsic pressure regulation. The asymmetric pressure control valve, which may be referred to as a dynamic pressure regulator because of its capabilities, utilizes different sized free floating spools that are physically independent of one another and freely supported in interior cavities of respective corresponding different sized valving components that make up the valve body to regulate the pressures acting within the overall system between the control or pilot pressure and the load or load pressure.

Abstract: A test fixture for testing directional pilot valves as used in connection with turbine engine thrust reversers, and an associated method of use. In a particular embodiment, the test fixture has a base and at least one support mounted to the base to support the directional pilot valve. At least one fastener permits attachment of the directional pilot valve to the support. An adjustable actuator is also mounted to the base and is capable of stroking the directional pilot valve to simulate valve positions that may be encountered in operation of the valve. The adjustable actuator is also capable of maintaining a force, as set by a technician, against the directional pilot valve.

Abstract: A valve assembly (112) includes a first member (120) having a cavity (136). A poppet (142) is located in the cavity (136) in the first member (120). The poppet (142) is axially movable relative to the first member (120) within the cavity (136). A poppet seat (138) has a passage (148) for conducting fluid toward the cavity (136). The poppet seat (138) engages the first member (120) and extends axially into the cavity (136) in the first member. The poppet seat (138) is axially movable relative to the first member (120). The poppet (142) is biased into engagement with the poppet seat (138) to close the passage (148) in the poppet seat. A locking member (172) engages the poppet seat (138) and the first member (120) to fix the poppet seat to the first member in any one of a plurality of axial positions relative to the first member.

Abstract: A valve assembly (112) includes a first member (120) having a cavity (136). A poppet (142) is located in the cavity (136) in the first member (120). The poppet (142) is axially movable relative to the first member (120) within the cavity (136). A poppet seat (138) has a passage (148) for conducting fluid toward the cavity (136). The poppet seat (138) engages the first member (120) and extends axially into the cavity (136) in the first member. The poppet seat (138) is axially movable relative to the first member (120). The poppet (142) is biased into engagement with the poppet seat (138) to close the passage (148) in the poppet seat. A locking member (172) engages the poppet seat (138) and the first member (120) to fix the poppet seat to the first member in any one of a plurality of axial positions relative to the first member.

Abstract: A method and a valve apparatus for counteracting harmful pressure pulses caused by rapid retardation of a liquid in a hydraulic system comprising a pump for the supply of liquid to a conduit stretch containing a non-liquid-filled volume. The valve apparatus comprises a main valve having an inlet connected to a reservoir for pressurised gas, a first valve chamber connected in use to said volume, and a regulating unit for controlling the supply of pressurised gas to the first chamber.

Abstract: A gas purge valve comprising a valve housing that has a valve inlet and major and minor valve outlets, a valve partition mounted in the housing divides the housing into a first chamber communicating with the valve inlet and a second chamber that communicates with the minor valve outlet. A restrictive flow passage is defined in the housing that effects communication between the first and second chambers and has a through flow rate less than that of the minor valve outlet. A minor valve closure device is provided for closing the minor valve outlet to liquid outflow. A differential pressure responsive device mounted in the partition member and displaceable in response to a pressure differential between the chambers and a major valve outlet obturating device responsive to displacement of the differential pressure responsive device into the opening of the major valve outlet when the pressure differential exceeds a predetermined magnitude.

Abstract: The invention relates to a relief valve and intends to provide a relief valve which can reduce the difference between the dynamic set pressure and static set pressure of the relief pressure and its variation.An internal circumferential surface of the pilot valve element 214 to which a support 227 is inserted is expanded to form a sub valve chest 231, a support and sub valve element 232 externally fitted to the sealing member 229 is arranged in this sub valve chest 231, the clearance between the inner circumferential surface of the sub valve element 232 and the support 227 is sealed with the sealing member 229, and at the same time the sub valve element 232 is pressed against the sub valve seat 238 formed in the inner circumferential surface of the pilot valve element 214 by oil pressure exerted on the sub valve element 232 from the pressure chamber 208 side to seal the clearance between the sub valve element 232 and the support 227.

Abstract: The invention intends to provide a relief valve which can prevent malfunction caused by generation of negative pressure lowering the minimum pressure to be originally maintained by a load circuit.Maloperation of a relief valve 401 is prevented by allowing a check valve 423 for preventing a backflow from a main valve element 410 and pilot valve element 412 side to a load port side 402 to be intervened at a pressure chamber 408 between a load port 406 connected to a load circuit, a main valve element 410, and a pilot valve element 412 and by applying a hydraulic lock when negative pressure lower than the minimum pressure to be originally maintained by a load circuit is generated. And by communicating a downstream chamber 425 downstream of the check valve 423 to a return port 407 with a reset oil passage 429 which is opened and closed by a reset valve 430, the hydraulic lock is designed to be released.

Abstract: The invention relates to a relief valve and intends to provide a relief valve designed to improve response and operational stability. In an overload prevention safety device in which a main valve element including a pilot valve element in a valve case is arranged, a pilot valve is opened by oil pressure exerted on the pilot valve element from an oil passage formed in the main valve element while resisting to an energizing means for energizing the pilot valve element. By this operation oil pressure is exerted on the pilot valve element side of the main valve element to open the main valve. An oil passage is designed to be constructed in holes with different diameters with a small-diameter section, a taper section, and a large-diameter section continuously arranged in that order. A pilot valve seat is sealably in contact with the pilot valve element mounted at the connections between the small-diameter section and the taper section.

Abstract: A valve assembly used in combination with a pressurized-fluid source having a high-pressure side and a low-pressure side and a load has a pressure-actuated flow regulating valve having a housing and a valve body movable in the housing and defining therein a pump compartment connectable to the high-pressure side of the source and a load compartment connectable to the load. The body is movable between a front position permitting free flow from the pump to the load compartment and a rear position limiting such flow. The valve body is formed with a throughgoing bypass passage having one end open into the load compartment and an opposite end. A spring braced between the valve body and the housing urges the valve body forwardly along an axis toward the load compartment. A relief valve in the housing connected to the opposite bypass passage end and to the low-pressure side of the source relieves pressure in the load compartment when pressure in the load compartment exceeds a predetermined limit.

Abstract: An isolation automatic control valve is formed by disposing an isolation valve of very simple structure in the inlet and outlet passages of a main valve or in the passage joining a main valve and its pilot valve, which not only controls normal operation during automatic controlling but also can isolate the main valve from the pilot valve for on-line maintenance while simultaneously controlling operation of the main valve manually or automatically. The isolation valve includes a throttling function to enable the main valve to acquire various control parameters. The present invention enumerates nine embodiments of different pressure, flow and direction control valves, each being applicable in various fields of general purpose valves, hydropneumatic valves and instrument valves. The present invention exhibits compact structure, simple piping, adjustable parameters and convenience in operation.

Abstract: A pressure control valve has a main valve element of seat type slidably accommodated in a valve case for controlling communication between inlet and outlet sections of the valve case by movement of the main valve element, a control chamber defined within the valve case and between the valve case and an end face of the main valve remote from the outlet section for biasing the main valve element in a valve closing direction, and a variable restriction variable in its opening in response to the movement of the main valve element for communication between the control chamber and the inlet section of the valve case.

Abstract: A high pressure relief valve for use in fluid systems, gas or liquid with zero leakage at pressures of 25,000 psi and above. The relief valve includes a valve body having an axial bore communicating with the high pressure fluid system with at least one, and preferably four, outlet orifices formed therethrough. A small diameter pilot hole is formed in the valve body communicating with the axial bore thereof and with a pilot seating area on an exterior surface thereof. A poppet member having an internal bore is slidably fitted over the valve body to seal off the outlet orifices when in a closed position and for uncovering the orifices when in an open position. A spring biases the poppet in the closed position. A pilot plunger is slidable mounted within the internal bore of the poppet to seal-off the pilot hole of the valve body when in a closed position. A spring biases the pilot plunger in the closed position.

Abstract: Control safety valve means for an enclosure containing a pressurized fluid. With the cylindrical chamber, the piston defines a pressure chamber for closing the main valve, the pressure chamber being linked with the enclosure by a passage. The piston has a face directed towards the closing pressure chamber A of the main valve, and the surface of the piston face directed towards the main valve closing chamber is greater than the surface of the main valve directed towards the enclosure. The main valve is located on the side of the outlet with respect to the seat of the valve means.

Abstract: A two stage relief valve, in which the pilot flow is limited by an active flow control element to a specific maximum predetermined level, to extend its maximum operating pressure range and to improve its operating characteristics. The downstream orifice may be fully open and of a fixed area type, or may be controlled by a spring or solenoid biased member. With the downstream orifice solenoid or stepper motor operated, the relief pressure level becomes responsive to an electrical input signal.

Abstract: A hydraulic fuse closes flow of hydraulic fluid in a hydraulic line upon loss of downstream fluid pressure. The hydraulic fuse includes a housing having an upstream opening and a downstream opening and a poppet slidably mounted within the housing for opening and closing fluid flow between the upstream and downstream openings. A spool is slidably mounted within the poppet for opening and closing fluid flow between first and second ends of the poppet. The spool includes a head which is positioned within the poppet and a rod which extends outwardly from the second end of the poppet and into the housing. When downstream pressure is lost, differential pressure acting on the first and second ends of the poppet will move the poppet to close fluid flow.

Abstract: It comprises a valve body constituted by a cylinder, defining a chamber and a seat, a valve placed in the cylinder and having a stem, a main flap and a plunger sliding in the chamber, means for elastically applying the main flap to the seat, a passage establishing a connection between the chamber and the pressurized enclosure. The passage is provided by a channel, which axially traverses the valve. A hole incorporating a metering hole links the chamber with the atmosphere.

Abstract: The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displaced by changes in pressure and a movable valving member (50) which is movable relative to a stationary valve seat (42) for adjusting the cross section of a flow path therebetween. The movable valving member is operatively connected with the pressure displaceable structure such that the cross section of the flow path varies generally in inverse proportion to the sensed pressure. A proportioning assembly (B) proportions back pressure from adjacent a mixed fluid outlet (132) between the flow regulating assemblies such that each flow regulating assembly regulates its fluid flow in accordance with the proportion of the back pressure accorded it.

Abstract: A gas regulator valve comprising a housing with an inlet and an outlet and a partition wall or the like, which divides the housing into two chambers. The inlet communicates with the first chamber and with the outlet via a main valve. Between the two chambers a pressure equalizing passage for the gas is provided, and between the second chamber and the outlet a narrow channel is provided which has a valve seat facing toward the second chamber. The valve seat cooperates with an externally regulated valve body. When the valve is to be utilized in connection with a breathing valve for breathing masks, it also comprises a respiration sensor in the form of a membrane or the like. Via a link arm system or the like, the movement of the sensing membrane is transmitted to the valve body via a needle or a rod which passes through the channel.

Abstract: The mixing valve includes a plurality of flow regulating assemblies (A) each of which independently regulates the flow of one of a plurality of fluids. Each flow regulating assembly includes a pressure displaceable structure (22) which is physically displaced by changes in pressure and a movable valving member (50) which is movable relative to a stationary valve seat (42) for adjusting the cross section of a flow path therebetween. The movable valving member is operatively connected with the pressure displaceable structure such that the cross section of the flow path varies generally in inverse proportion to the sensed pressure. A proportioning assembly (B) proportions back pressure from adjacent a mixed fluid outlet (132) between the flow regulating assemblies such that each flow regulating assembly regulates its fluid flow in accordance with the proportion of the back pressure accorded it.

Abstract: A device for regulating the vacuum in milking installations has a main valve and an auxiliary valve. A main valve chamber is connected with the atmosphere and, through a valve seat to the vacuum line. A control chamber is closed off from the main valve chamber by a first membrane and from the atmosphere by a second membrane. Both membranes are joined to a movable support bearing the main valve body, which presents active surfaces of different size to the main valve chamber and to the atmosphere. The position of the main valve is dependent upon the pressure in the control chamber, which pressure is determined by the auxiliary valve which is disposed in the support. The auxiliary valve has two auxiliary chambers separated by an auxiliary membrane to which the auxiliary valve body is fastened. The first auxiliary chamber is connected to the vacuum line and the second auxiliary chamber is connected to the atmosphere.

Abstract: A scuba regulator second stage utilizes pneumatic amplification to achieve very low inhalation effort. The regulator includes (a) a main flow valve consisting of a poppet moveable within a valve housing inside the regulator body, (b) a pilot valve mounted within and carried by the main valve poppet, and (c) a pressure sensing diaphragm linked to the pilot valve.During inhalation, the diaphragm and linkage open the pilot valve to admit gas at supply pressure into a space, between the poppet and a closed end of the housing. This gas displaces the poppet, thereby opening the main flow valve and supplying gas to the diver. Pneumatic amplification is achieved. The poppet displacement tends to close the pilot valve, so that the poppet-opening force is reduced. This feedback effect results in substantially linear relationship between inhalation demand and the amount of breathable gas supplied to the diver.

Abstract: A pilot operated fluid pressure relief valve has a main valve operable by opposed piston areas, both normally exposed to inlet pressure whenever that is below the maximum pressure setting of the valve. A pressure responsive pilot valve is exposed to inlet pressure through a restricted path and when open, exhausts fluid from the piston area which holds the main valve closed. The restricted pathway contains two laminar flow orifices one of which is between the inlet and the valve closing piston area and the other is between the valve closing piston area and the outlet through the pilot valve. This arrangement provides good damping of oscillations, while minimizing any changes in effective opening pressure which are otherwise caused by the use of a single laminar flow orifice for damping purposes.

Abstract: This disclosure relates to a hydrant coupling device including a pressure control valve which, due to its portability, may be connected to any one of a plurality of hydrants to regulate the flow of liquid therefrom, and additionally including a pit valve which is interlocked with the pressure control valve body to prevent the spilling of liquid if the control valve is accidentally forced loose from the pit valve.

Abstract: Flow rate limiting valve for pipes for liquid or gaseous fluids of the type comprising a cup plug which extends telescopically from an ogival chamber contained in the valve body, and communicates with the fluid upstream of the valve seat by a channel in the fixed part and with the fluid downstream of the valve seat by a channel in the head of the cup plug, being possible to close or throttle said second channel by a needle which extends to the outside of the ogival chamber and terminates with an orthogonal disc receiving the hydrodynamic thrust of at least a part of the lines of flow of the entering fluid, comprises external control device to regulate the thrust, the lever arm and the tilt of the spring to lever which transmits the thrust of the calibrating spring to the needle, thus being possible to determine, by acting on these external means; the flow rate, the opening and the closure of the valve, along with his characteristic-curve and the flow rate value.