Abstract: A pressure relief valve includes a valve body having an inlet and an outlet and defining a first fluid path fluidly connecting the inlet and the outlet of the valve; a valve member axially moveable between a first position and a second position, the valve member configured to close the fluid path in the first position and thereby restrict flow between the inlet and the outlet, the valve member configured to open the fluid path in the second position and thereby allow flow between the inlet and the outlet; a biasing element configured to bias the valve member in the first position; and a friction element resiliently biased laterally against an axially extending surface of the valve member to provide frictional resistance to movement of the valve member and thereby cause hysteresis in axial movement of the valve member between the first position and the second position.

Abstract: Disclosed are check valve assemblies operable to inject treatment fluids during stimulation operations. One check valve assembly includes a valve body defining an inlet, one or more discharge ports, and a cylindrical passageway that fluidly communicates the inlet with the one or more discharge ports, the valve body further providing a cylindrical section in which the one or more discharge ports are defined, a valve cap disposed about an exterior of the cylindrical section and defining an opening that fluidly communicates with the cylindrical passageway, and a spherical piston disposed within the passageway and movable between a closed configuration, where the spherical piston prevents fluid communication between the inlet and the one or more discharge ports, and an open configuration, where fluid communication is allowed between the inlet and the one or more discharge ports.

Abstract: According to various aspects, exemplary embodiments are disclosed of check valves and fluid control valve assemblies including the same. In an exemplary embodiment, a valve assembly generally includes a valve housing including a check valve chamber and an opening. The valve assembly further includes a check valve for controlling fluid flow relative to the check valve chamber. A plug is sealingly engaged within the opening, to thereby seal the check valve chamber and restrict fluid flow from the check valve chamber out the opening through the valve housing. A flux-coated solder ring may be along an outer surface of the plug, without any flux-coated solder ring along an inner surface of the plug.

Abstract: A pump assembly includes a rotating component and a stationary component coupled to the rotating component such that the stationary component substantially circumscribes at least a portion of the rotating component. A high pressure outlet extends at least partially through the rotating and stationary components. An inlet is positioned a predefined distance from the high pressure outlet. The inlet extends at least partially through the rotating and stationary components. A solid fuel flow is channeled from the inlet to the outlet as the rotating component rotates. A flow control member is coupled to the rotating and stationary components in a first predefined position. The flow control member is selectively moveable from the first predefined position to a second predefined position to form a seal within the pump assembly such that the solid fuel flow and a fluid flow are substantially restricted from being channeled back into the inlet.

Abstract: A valve comprising an inlet and an outlet, the valve having a valve element moveable between a first equilibrium position and a second open position, wherein when the valve element is in the first position, the inlet and the outlet are not in flow communication and when the valve element is in the second position the inlet and the outlet are in flow communication, and wherein the valve element is moveable between the first position and the second position in response to the pressure at the inlet and the outlet.

Abstract: A pressure relief valve for a hydraulic press tool comprises a valve body, a fluid return channel, a needle and a seat, and the needle is movable between a closed position, in which the needle is in contact with the seat to block the channel, and an open position, wherein the needle is at a distance from the seat to allow fluid to flow in the channel, and the fluid flow then causes movement of the seat away from the needle and completes the opening of the fluid return channel.

Abstract: A check valve which includes a body adapted at one end to receive a liquid source and at the other end to engage with a spray nozzle and having a bore therethrough, an internal annular recess within the body, the upstream end of which body provides a valve seat, a valve assembly located in the recess and having a valve member having a generally curved end directed towards the seat and bias means to normally hold the member against the seat until the pressure at the inlet reaches a pre-determined minimum.

Abstract: A solenoid fluid control valve having a valve body containing a solenoid coil, a fluid channel, and a seat, each coaxially disposed about a central longitudinal axis of the body, and a one-piece armature of MRE material. The armature is disposed within the fluid channel and magnetically actuable to seal against the seat, with operation of the solenoid coil actuating the armature with respect to the seat to alter the closure state of a fluid port. Also, a fluid check valve having a first valve body part defining a seat, a fluid port, and a first portion of a fluid chamber, with the seat including a permanent magnet element disposed adjacent the fluid port proximate the fluid chamber. A one-piece armature of MRE material is disposed across the fluid port and magnetically sealable against the magnet element. The armature and magnet element are configured to create a preselected magnetization offset pressure portion of a valve cracking pressure.

Abstract: Disclosed is a valve arrangement which includes a housing having a first conduit having a first discharge cross-section, a second conduit having a second discharge cross-section, and at least one valve seat within the interior chamber of the housing having at least one valve seat opening which cooperates with at least one valve disc. The valve disc is moveable between a closed position seated on the valve seat opening, and an open position spaced apart from the valve seat opening. There can be also provided an actuator for moving the valve disc between the open and closed positions. The valve seat opening has a cross-section that is larger than the discharge cross-section of the first conduit and/or the discharge cross-section of the second conduit. The cross-section of the valve disc is greater than the valve seat opening.

Abstract: A drive mechanism for back pressure regulator used in liquid chromatography, supercritical fluid chromatography, or supercritical fluid extraction allows very fine automated control over a very wide range of pressures by combining a linear actuator compressing a spring, pushing a pin. The nozzle assembly of the regulator comprises a flow through chamber containing a diaphragm and a seat, in which the pin pushes the diaphragm against the seat, together with an upstream pressure sensor and electronic feedback control to the motor of the actuator. The BPR of the embodiments exhibits high pressure stability and extremely low pressure noise, even at moderate to high pressures. The exemplary BPR can be use at either constant pressure or to generate pressure programs where the pressure is varied versus time. Further, the nozzle assembly has a field-replaceable head, requiring no mechanical adjustment on replacement.

Abstract: A first directional control valve for switching between a first supply position and a first discharge position and a second directional control valve for switching between a second discharge position and a second supply position. A first switching mechanism permits the first directional control valve to be switched to the first supply position in a state where a second switching mechanism has switched the second directional control valve to the second discharge position. In a state where the second switching mechanism has switched the second directional control valve to the second supply position, a pressure fluid supplied to the second directional control valve at the second supply position switches the first directional control valve to the first discharge position via the first switching mechanism.

Abstract: An over-pressure relief valve for use with a container housing a pressurized medium. The valve includes a hollow housing within which there is first and second valves. The first valve is operable to inject and release the pressurized medium into the container. The said valve is normally closed and is continuously exposed to the pressurized medium and in response to the pressure thereof reaching a predetermined level opens to exhaust the pressurized medium to the atmosphere to relieve the excess pressure.

Abstract: A pressure regulating valve has a first pressure deformation portion connected to and receiving a pressure on a fuel demand side, a second pressure deformation portion opposed to the first pressure deformation portion and receiving a predetermined pressure, first and second flow passages, and a communication passage communicating the first and second flow passages to each other. A valve member has a connecting portion connecting the first and second pressure deformation portions together, and has a valve element provided at the connecting portion and configured to close the communication passage when moved toward the second pressure deformation portion. When the pressure on the fuel demand side is lower than a predetermined value, the valve element does not close the communication passage, but when the pressure on the fuel demand side is equal to or higher than the predetermined value, the valve element closes the communication passage.

Abstract: Disclosed herein is a pressure valve for an energy storage device. The energy storage device according to an exemplary embodiment of the present invention includes: a valve body provided with a vent guide for communicating a gas vent of the energy storage device with the outside; and an elastic body interposed between the valve body and the gas vent to elastically support the valve body to an inner side of the gas vent to move the valve body to an outer side of the gas vent when a gas pressure in the gas vent rises, thereby communicating the vent guide with the outside and recover the valve body when the gas pressure in the gas vent falls, thereby blocking the vent guide from the outside.

Abstract: A flow control screen having a fluid flow path between the interior of a base pipe and a filter medium. A valve assembly, including a piston body, a valve plug and a ball retainer having an opening, is disposed within the fluid flow path. The piston body has an internal seat and a collet assembly that is radially outwardly constrained by the ball retainer in a first operating position to retain the valve plug therein and radially outwardly unconstrained by the ball retainer in a second operating position. Reverse flow is initially prevented as internal differential pressure seats the valve plug on the internal seat and causes the piston body to shift to the second operating position upon reaching a predetermined threshold. Thereafter, external differential pressure causes the valve plug to be expelled from the valve assembly through the opening of the ball retainer, thereby no longer preventing reverse flow.

Abstract: Disclosed herein is an air valve for an energy storage device, including: a valve body mounted in a gas vent of an energy storage device and having a passage for discharging gases within the gas vent to the outside; and a plurality of magnets mounted within the passage to apply repulsion force to one another so as to block the gas vent from the outside by the repulsion force and communicate the gas vent with the outside when a gas pressure within the gas vent is larger than the repulsion force, thereby discharging gases. By this configuration, exemplary embodiments of the present invention can configure the air valve with the simple structure capable of smoothly discharging gases generated from the energy storage device while minimizing a volume of the air valve and being semi-permanently used while minimizing a mechanical configuration of the air valve.

Abstract: A fluid control device includes a housing providing a fluid inlet and fluid outlet and a passage extending therebetween. The passage has a longitudinally extending tapered portion which narrows in the direction towards the inlet, and a fluid flow control member located in the passage and having a tapered end corresponding to the tapered portion of the passage. The fluid flow control member is movable longitudinally within the passage between a first position, in which the tapered end of the member engages the tapered portion of the passage and fluid flow along the passage towards the inlet is prevented, and a second position in which fluid flow along the passage is possible.

Abstract: In a face sealing annular valve, an annular valve member is retained around or within a guide. The annular valve member is configured so that, when the annular valve member and the annular valve seat are coaxial, the spacing between the guide means and the guide-engaging surface region increases with distance along the central axis from a minimum of spacing between the annular valve member and the guide means. An end stop limits the tilt of the annular valve member. Advantageously, the annular valve member has restricted radial movement, enabling a good seal to be formed, while being unable to simultaneously contact diametrically opposite sides of the guide and jam.

Abstract: The present invention relates to a magnetic flow controller which transforms a slow reduction in pressure of fluid flow over time to a measurable fluid flow. Once a threshold pressure differential is reached, a flow passage through the flow controller opens rapidly to a relatively large opening, thereby generating a volume of fluid at high flux flowing through the passage, particularly to permit the measurement of the volume of fluid in a conventional flow meter. The device of the present invention integrates this low flux and transforms it to a measurable fluid flux, so that the fluid can be measured by the fluid meter within its optimum error range. This is accomplished while maintaining a pressure drop in the flow meter which is within the permitted standards. Thus, the invention provides relatively sharp shifts between substantially high flux flow and no flow, in a pulse-like manner.

Abstract: Disclosed herein is a differential pressure poppet valve comprising: a valve body, the valve body having at least one flow inlet and at least one flow outlet; at least one shutter guide disposed inside the valve body; at least one poppet shutter guided by the shutter guide; at least one flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the poppet shutter. The valve further comprises at least one biasing member configured to bias the poppet shutter towards a closed position so as to block the flow passage through the flow inlet. To reduce impact wear at least a first damper is provided, configured and arranged to at least partly absorb impact energy of the poppet shutter when the poppet shutter opens or closes the flow inlet.

Abstract: Pressure-balanced fluid pressure regulators are described. An example fluid regulator includes a fluid flow control member disposed within a fluid flow passageway of a valve body and moves relative to a seat ring to modulate fluid flow through the fluid flow passageway. A valve stem couples the fluid flow control member to an actuator. The valve stem has a pathway to allow fluid from an inlet of the fluid flow passageway to flow across the flow control member between a first side of the flow control member and a second side of the flow control member opposite the first side to pressure-balance the fluid flow control member.

Abstract: A pressure regulator valve replacement assembly for maintaining a flow of transmission fluid to various fluid circuits within a Honda automatic transmission during low torque operation of a torque converter is disclosed. To accomplish this, the pressure regulator valve replacement assembly includes a valve piston subassembly having control diameters, and a valve chamber containing a check ball.

Abstract: The present invention discloses a bidirectional pressure self-balancing stop valve, comprising a valve body, a valve disc, a press ring, a valve bonnet, a valve rod and a balance hole, in which the valve disc is located inside the valve body chamber, the press ring is threadedly disposed on the upper side of the valve body chamber, the valve bonnet is fixedly connected with the valve body, the valve rod passes through the valve bonnet and the lower end of the valve rod is movably connected with the valve disc. The excircle of the valve disc, the press ring and the valve body form an annular groove, inside which is disposed with a composite seal ring that is high temperature resistant or corrosion resistant. The composite seal ring includes an upper washer, an upper seal ring, an upper distance ring, a blocking ring, a lower distance ring, a lower seal ring and a lower washer from top to bottom. The invention uses a bidirectional self-sealing structure.

Abstract: A pressure regulator includes a housing assembly defining a main fluid flow path from an inlet end to an outlet end. A tubular plunger body is supported within the housing assembly for linear movement toward and away from a valve seat in response to fluid pressure at said outlet end. An actuator sleeve is supported within the housing assembly and engaged with the tubular plunger body, and a pressure chamber defined in part by a shut-off diaphragm extends between the housing assembly and the actuator sleeve. A fluid port is arranged to supply pressurized fluid to the pressure chamber to thereby produce linear movement of the actuator sleeve and the tubular plunger body independent of the pressure at said outlet end, moving the tubular plunger body into engagement with the valve seat to shut off the flow path.

Abstract: A fast opening pressure relief valve (200) for providing pressure relief for a vessel. The valve (200) has an ejector (216) and a sleeve structure (210) in which the ejector (216) moves longitudinally. The ejector (216) is constructed of material that will expand outward slightly upon pressurization, increasing friction between staging glands (202) provided on the sleeve structure (210) and buckling glands (206) provided on the ejector (216). Also, as pressure on the ejector (216) increases, the buckling rings (206) deform slightly to release their grip on the staging glands (202) and move past them. Once the buckling rings (206) move past the staging glands (202), the pressurized ejector (216) quickly moves to its open position, i.e. opening within 2 and 3 milliseconds, thereby releasing the pressure on the vessel. The valve (200) can be reset by returning the ejector to its closed position.

Abstract: A check valve is provided for use with a compressor system having a pump and a storage tank, the check valve including a housing including an inlet connected to the pump, a tank port in fluid communication with the storage tank, and a bypass port, all in fluid communication with each other, and with a chamber. A reciprocating piston is disposed in the chamber and has a heavy spring at one end, and a light spring at the other end. The check valve is constructed and arranged so that pressurized air is accessible from the bypass port prior to the storage tank being fully pressurized.

Abstract: A magnetic safety valve for installation through a tank wall incorporates a piston movable within a valve body. The valve is held normally-closed by two opposite-pole magnets, one in the inner end of the piston, and one in the valve body. A vacuum produced by a pump connected to the valve will act upon the outer end of the piston, producing a force tending to move the piston outward. When the vacuum-induced outward force on the piston exceeds the attractive force between the two magnets, it pulls the piston outward and away from the valve body magnet, unseating the inner end of the piston from the valve body, and allowing outward fluid flow through the valve. A second valve seat may be provided for engagement with an outer portion of the piston to prevent uncontrolled fluid flow out of the tank in the event of valve damage.

Abstract: A check valve is installed in the pressure flow line of an abrasive blaster of the type having a pop-up valve which opens under pressure and closes when depressurized to a predetermined level. The check valve is upstream of the pop-up valve and includes a having a valve chamber in communication with the pressure system for seating a valve mechanism adapted for opening and closing the valve chamber in response to the pressure level in the pressure system for closing the pressure system to back flow when the pressure in the system reaches a predetermined level.

Abstract: A check valve, in particular for foodstuff, chemical, biological and pharmaceutical applications. Valve allows passage of a fluid with limited losses of load and with low energy consumption. Valve is particularly suitable for use with corrosive and/or foodstuff fluids.

Abstract: A check valve construction is provided having: a movable disc having a convex surface, a flat surface and a raised element on the convex surface, a cage for the disc, a first seat for the flat surface of the disc, and a second seat for the convex surface of the disc. A fluid path is provided between the disc and the cage including a narrowest portion of the fluid path defined by the equation: G = 12 ? ?? ? ? D W ? ? ? ? ? P wherein G: the height of the gap of most narrow passageway between the flat surface of the disc and disc seat. ?: dynamic viscosity of the fluid; D: mean diameter of the flat sealing surface of the disc; Q: desired fluid flow rate; W: breadth of the flat sealing surface of the disc; ?P: pressure differential across the gap (G).

Abstract: A backflow and strainer device is presented. The device is a unitary unit that prevents backflow of fluid gas in a compressor and prevents dirt particles and debris from entering the compressor, thereby damaging the components. A valve mechanism moves between an open position and a closed position to either allow or prevent fluid gas from flowing into the compressor. A mesh portion is disposed in the device to trap all dirt particles and debris to prevent them from entering the compressor. The valve mechanism responds to the higher and lower pressures associated with the operation and shutdown of compressors.

Abstract: A pressure regulator includes a housing assembly defining a fluid flow path from an inlet end to an outlet end; a plunger having a tubular plunger body supported within the housing assembly for linear movement toward and away from a valve seat in response to fluid pressure at the outlet end. A sleeve is supported within the housing assembly and is engageable with the tubular plunger body, and an actuator collar is supported externally of the housing assembly and operatively attached to the sleeve such that rotation of the actuator collar in one direction from an open position to a closed position produces linear movement of the tubular plunger body, independent of the pressure at the outlet end, into engagement with the valve seat to thereby shut off the flow path within the regulator.

Abstract: A flow control screen having a fluid flow path between the interior of a base pipe and a filter medium. A valve assembly, including a piston body, a valve plug and a ball retainer having an opening, is disposed within the fluid flow path. The piston body has an internal seat and a collet assembly that is radially outwardly constrained by the ball retainer in a first operating position to retain the valve plug therein and radially outwardly unconstrained by the ball retainer in a second operating position. Reverse flow is initially prevented as internal differential pressure seats the valve plug on the internal seat and causes the piston body to shift to the second operating position upon reaching a predetermined threshold. Thereafter, external differential pressure causes the valve plug to be expelled from the valve assembly through the opening of the ball retainer, thereby no longer preventing reverse flow.

Abstract: A check valve includes a case body, a piston device, and a blocking plate. The case body includes a first case part and a second case part. The first case part has a first opening. The second case part has a second opening and a third opening. The second opening faces the first opening, and the third opening is located at one side of the second opening. The first case part and the second case part are combined to form the case body, and the case body has a fluid passage therein. The piston device is aligned to the second opening and mounted on the second case part. The blocking plate is disposed on the piston device. When the piston device operates, the piston device pushes the blocking plate to seal the first opening.

Abstract: A pressure regulator for irrigation systems, comprising a main body (2) defining an axis (X), which has an inlet port (3) for irrigation water, and outlet port (4) and a chamber (8) for detection of water pressure changes, which is in fluid connection with the outlet port (4); a closing member (9) sliding along the axis (X) between a rest position distal from the inlet port (3) and a work position proximal thereto; a regulating member (15) fixed in the detection chamber (8) and operably connected with the closing member (8) for detecting its position along the axis (X) in response to the detected pressure. The regulating member (15) comprises an elastomeric wall (16).

Abstract: A pressure-relief valve assembly is improved in that sealing surfaces on both the valve seat and valve head are confrontationally disposed annular planar surfaces oriented substantially perpendicular to the valve axis. A resilient valve seal is formed of a material which deforms to a predetermined extent into sealing engagement against both sealing surfaces when compressed by the spring biasing force. When a vacuum exists the combination of the spring force and a holding force created by a pressure differential acts to increase the extent of compression between the resilient valve seal and both sealing surfaces sufficient to create a vacuum-tight seal. The magnitude of the spring biasing force in discrete increments may be adjusted by varying the degree of threaded engagement between members forming the valve housing.

Abstract: Flow directing apparatus for use with fluid regulators are described herein. An example fluid regulator includes a body having a passageway defining an orifice that fluidly couples an inlet and an outlet. A valve plug is disposed within the passageway that moves relative to a valve seat adjacent the orifice. An actuator operatively coupled to the valve plug and the actuator includes a sensing chamber fluidly coupled to the outlet of the passageway. The actuator moves the valve plug relative to the valve seat to control fluid flow through the orifice between the inlet and the outlet in response to the pressure of a process fluid at the outlet. A flow directing member is coupled to the valve plug.

Abstract: The invention concerns a filling control device of a hydrodynamic machine having two inlets and two outlets as well as two valve bodies. The two valve bodies can be shifted by means of a piston rod, to control the flow of working medium in the inlets and outlets as an open or closed-loop. The invention is characterised in that that the first valve body is connected elastically on the piston rod and that a stationary stop is provided for the first valve body, against which the first valve body strikes when the second valve body is further shifted by means of the piston rod.

Abstract: An evacuation valve for a metering device for a liquid medium is disclosed. The valve includes a seal holder having a chamber formed therein and a seal. An elastomeric material fills the chamber to form the seal. The seal includes a smooth, flat sealing surface located above the seal holder. The inclusion of a lip in the chamber retains the seal; a non-circular lip prevents rotation of the seal.

Abstract: A pressure regulating valve comprises a first pressure deformation portion which receives a pressure on a fuel demand side, a second pressure deformation portion opposed to the first pressure deformation portion and which receives a predetermined pressure, first and second flow passages, and a communication passage for allowing the first and second flow passages to communicate with each other. The first and second flow passages and the communication passage are provided in a space between the first and second pressure deformation portions. A valve member has a connecting portion which extends through the communication passage and connects the first and second pressure deformation portions together, and has a valve element which is provided at the connecting portion and closes the communication passage when moved toward the second pressure deformation portion.

Abstract: An apparatus for the relief of grease under pressure in the delivery line of grease guns and similar pressure delivery devices includes a 3-port valve in which the relief port is located between the delivery and inlet ports and includes a one way flow control valve mounted therein. The one way flow control valve is maintained in a closed position by the pressure of the grease and is activated to be opened to reduce the pressure in the valve body and allow the grease to return to the grease reservoir.

Abstract: A ball check valve that prevents vibration of the ball that occurs when fluids are conducted, so as to limit noise, without reducing the flow rate of the fluid includes a cylindrical valve main body having two opening parts and provided on an inner face with axially oriented elongate protrusions; a holding ring, which is held on the upstream opening part of the valve main body, abutting end faces of the elongate protrusions; a seat ring, which is disposed adjacent to or fitted with the holding ring; and a globular valve element, which is held so as to be able to reciprocate between stop faces on the elongate protrusions and a valve-closed position.

Abstract: A pressure control valve designed as a slide valve and having an axially situated supply port.

Abstract: A tip-resistant valve plug includes a valve head, first and second retention legs, and an anti-tip fin. The valve head includes a continuous partition defining a fluid barrier between a sealing side and an external side of the valve head. Each of the first and second retention legs extend from a leg base positioned at the sealing side of the valve head to a distal end of the retention leg. Each of the first and second retention legs include a plug catch configured to interfere with an inside diameter of a fluid flow orifice or a pressure relief spring. The respective distal ends of the retention legs are spaced apart from one another, and the anti-tip fin extends from the sealing side of the valve head in a direction of the respective distal ends of the retention legs.

Abstract: A pressure regulator apparatus usable with an aerosol supply device containing a fluid includes an inflatable diaphragm unit including an upper surface member, a lower surface member, and a diaphragm chamber formed between the upper surface member and the lower surface member, an output port member having an output cavity and an output port, at least a portion of the output port member is disposed within and in fluid communication with the diaphragm chamber, a valve actuator including an actuator cavity and one or more actuator openings in fluid communication with the output port, at least a portion of the valve actuator is moveably disposed within the output cavity, an input port member having an input port configured to allow the fluid to enter the actuator cavity, at least a portion of the input port member is disposed proximate to the actuator cavity, and an axial flow path extending between the input port and the output port, and configured to allow the fluid to selectively pass in a substantially axial

Abstract: A flow control device typically for protecting a seal (20) in a valve, wherein a body portion (5) has an orifice (8) allowing fluid flow, and the valve has a control portion (10) to allow and restrict fluid flow through the orifice. The flow control device has a fluid flow controller (30) between the body portion and the control portion in the form of at least one annular ring (35), disposed in a recess in one of the body portion and the control portion (10). The fluid flow controller (30) defines a leak path through the device that is opened and closed by a pressure differential acting across the annular member. Typically the application of a pressure differential across the fluid flow controller moves the ring(s) to one end of the recess and reduces the cross sectional area of the leak path available to the fluid, thereby diffusing the fluid flow through the orifice (8).

Abstract: The ball valve device comprises a tubular body in metal material, having a cylindrical wall conformed with spherical cup-shaped internal protrusions to retain a ball shaped valving member, preventing the same valving member from being entrained by a fluid flowing through the valve device. The internal spherical protrusions are formed by radially pressing and crimping the cylindrical wall of the tubular body at one or more angularly spaced apart deformable areas of an annular strip. The tubular body provided with the ball retaining protrusions is suitable for any valve device, such as ball check valves, pumping units, and/or ducts.

Abstract: A pressure relief valve includes a base including a fluid inlet and outlet, a nozzle, and a disc. The nozzle includes a substantially annular seat, a substantially cylindrical seat inlet, and a substantially cylindrical bore in fluid communication with the seat inlet. A ratio between a bore diameter and a seat diameter is a constraint ratio. The disc contacts the seat to seal the fluid inlet to substantially prevent fluid communication between the fluid inlet and outlet when the valve is closed. The disc and the disc holder are adapted to be urged by fluidic pressure such that contact between the disc and the seat is removed at the fluidic pressure to allow fluid communication between the fluid inlet and the cavity. Dimensions of the disc, the disc holder, and the nozzle may be functions of the seat diameter and limited by the constraint ratio.

Abstract: The present invention relates broadly to a valve assembly (10) being adapted to detachably receive a dry-break refuelling nozzle (12). The valve assembly comprises a receiver body (14) which defines a forward fuel passageway (16) in which a poppet valve member (18) is slidably mounted. The valve assembly (10) also comprises a tail body (22) secured coaxial with the receiver body (14) and defining a rearward fuel passageway (26). the tail body (22) slidably houses a check valve member or diffuser (28) which is driven by a hydraulic actuator or piston assembly (30).

Abstract: A valve, preferably of the flow control construction type, has a valve piston or pressure regulator piston mounted in an axially displaceable manner in a valve housing. The valve piston and the valve housing form a damping chamber for the motional damping of the valve piston.