Abstract: Two-way pressure relief valves featuring dual poppets and magnets that allow very rapid flow. Such flow is accomplished by a valve housing enclosing a hollow interior portion containing a stationary member including a magnet and a first pressure-movable poppet disposed in sealing arrangement with the housing and including a second magnet. To provide flow in the other direction, a second moveable poppet disposed coaxially and in sealing arrangement with the first poppet and is coupled to a spring that extends from a first end of the second poppet to a support structure coupled to the second magnet.

Abstract: An aircraft fuel system architecture which reduces the fleet-wide flammability exposure of the fuel tanks. In one embodiment, the aircraft center fuel tank fuel is cooled at certain times in a flight to reduce its flammability exposure to be similar to that of an unheated conventional metal wing fuel tank. Aircraft fuel tanks that have adjacent heat sources are also insulated to minimize heat flow into the fuel. Fuel tanks that have lower cooling properties, such as composite wing tanks are cooled at certain times during flight such that their temperatures are reduced to be similar to metal wing tanks when the fuel is flammable. A fuel tank that is pressurized relative to outside pressure at altitude having a lower flammability exposure than unpressurized tanks is combined with the cooling of fuel in the tank to reduce the fleet-wide flammability exposure of the fuel tank to be similar to that of an unpressurized metal wing tank.

Abstract: A pressure relief valve (10) is provided for controlling fluid flow between a first fluid path (12a) and a second fluid path (12b). The pressure relief valve includes a housing (14), a diaphragm member (24) movably affixed within the housing and having a fluid port (18), a first biasing member (20) for urging the diaphragm member in a first direction, and a sealing member (26) movably mounted in the housing and configured for reversibly sealing the fluid port (18). When a pressure at the second fluid path (12b) exceeds a first predetermined threshold the diaphragm member (24) is pushed against the first biasing member (20), and the sealing member (26) is initially urged towards the fluid port (18) and subsequently becomes disengaged with the fluid port, allowing fluid communication between the second fluid path (12b) and the first fluid path (12a) via the fluid port.

Abstract: A hydrogen supply unit is configured to inject hydrogen gas having flowed in an inflow passage into an outflow passage by use of an injector to reduce the pressure of the hydrogen gas. The hydrogen supply unit includes a primary-side relief valve for releasing the hydrogen gas from inside to outside of the inflow passage when the internal pressure of the inflow passage rises to a first predetermined value, and a secondary-side relief valve for releasing the hydrogen gas from inside to outside of the outflow passage when the internal pressure of the outflow passage rises to a second predetermined value. The primary-side relief valve and the secondary-side relief valve are held between the inflow block and the outflow block.

Abstract: In a relief valve device, a positive-pressure relief valve opens a first valve port when pressure in a pressure chamber increases to a pressure that is equal to or higher than positive-pressure side valve-opening pressure. A negative-pressure relief valve opens a second valve port when pressure in the pressure chamber decreases to a pressure that is equal to or lower than negative-pressure side valve-opening pressure. When the positive-pressure relief valve is closed, a positive valve-opening pressure adjustment unit adjusts a set load of a positive-pressure spring according to an amount of an adjustment screw screwed in the pedestal plate. When the negative-pressure relief valve is closed, a negative valve-opening pressure adjustment unit adjusts a set load of the negative-pressure spring via the valve plate through forward or backward movement of the pedestal plate relative to a housing main body.

Abstract: A check valve includes a casing including a positive pressure valve seat, a positive pressure valve urged by a positive pressure valve spring and including a negative pressure valve seat, and a negative pressure valve assembled to the positive pressure valve and urged by a negative pressure valve spring, where the positive pressure valve includes an inner cylinder, an outer cylinder that is connected with an outer circumference of the inner cylinder via ribs, and passages formed between the inner cylinder and the outer cylinder, where the positive pressure valve spring is disposed the casing and the outer cylinder, and where the negative pressure valve spring is disposed in the inner cylinder.

Abstract: A ventilation arrangement for the head space of the fuel tank of a vehicle consists of a valve assembly received in a housing (30), which assembly is arranged to produce a maximum pressure, which is not to be exceeded, a minimum pressure below which the pressure must not fall, and a random pressure, for example, for the tank filling process, within the head space. For this purpose a valve which is biased by a spring (25) in the direction towards an atmospheric connector (6) and is characterised by a sealing plate (17), and a valve biased by a spring (19) in the direction towards a connector (5) intended for connection to the head space, and a valve characterised by a sealing head (24) are provided, the latter of which is simultaneously connected to an electromagnetic drive in order to produce the random pressure.

Abstract: A hydraulic power steering system which includes a tank and a power steering pump which takes in a pressure medium from an intake area which is decoupled from the prevailing atmospheric pressure on the side of the tank wall and delivers it under pressure to the power steering system. A valve device builds up a pre-pressure in the intake area and prevents a negative pressure and a positive pressure from building up on the interior of the oil tank.

Abstract: A valve includes a housing configured to interengage with a container, a first and second poppets axially movable between open and closed positions, a first seal between the first poppet and the housing, a second seal between the first poppet and the second poppet, and first and second resilient members disposed within the housing and urging the first and second poppets toward the closed position.

Abstract: A check valve includes a main-casing, a sub-casing, a positive-pressure valve and a negative-pressure valve. The positive-pressure valve has through holes and a negative-pressure valve seat. The negative-pressure valve has leg portions. A cap is disposed within the positive-pressure valve. A positive-pressure spring is disposed between the positive-pressure valve and the sub-casing, and a negative-pressure spring is disposed between the positive-pressure valve and the cap. A positive-pressure flow path for releasing fuel vapor is formed between an outer circumference of the positive-pressure valve and an inner circumference of the main-casing, at further outward position than the positive-pressure spring. A negative-pressure flow path for introducing outside air is formed between an inner circumference of the positive-pressure valve and the leg portions and an outer circumference of the cap and between the through holes and the leg portions, at further outward position than the negative-pressure spring.

Abstract: A valve for limiting the tank pressure in a motor vehicle, comprising a first line (1) and a second line (2) which may establish a flow connection in which at least one body (3, 4) may be moved relative to another body (4, 3), whereby the movable body (3, 4) lifts up from a sealing seat (5), with regard to the object of adjusting the tank pressure using a compact design is characterized in that a first body (3), a second body (4), and the sealing seat (5) as a whole form a movable unit (6).

Abstract: A pressure retention valve with integrated valve is disclosed. The pressure retention valve with integrated valve includes a housing; an outer piston positioned in the housing; a main seal between the outer piston and the housing; an inner piston positioned in the outer piston, the inner piston having a bore containing a valve; a spring between the housing and a top of the outer piston; an ambient bore in the housing above the main seal; an outlet in the housing below the main seal; and a vessel connection in the housing adjacent to the bore of the inner piston. Methods of supplying fuel to a gas consuming system using the pressure retention valve are also described.

Abstract: A pressure limiting valve comprises a valve closing body (7) which comprises a valve closing surface (8) which together with a first valve seat (9) opposing the valve closing surface (8) forms a first seal seat and a valve closing body orifice (11), which is surrounded by a second valve seat (12) which together with a closing head (14) configured on an axially displaceable valve bolt (13) forms a second seal seat and with a spring plate (15) which is connected to the valve bolt (13) and axially displaceable therewith, and a first return spring (10) clamped between the spring plate (15) and the valve closing body (7), which pretensions the valve bolt (13) against the second valve seat (12) configured on the valve closing body (7) and a second return spring (35) which pretensions a valve unit (7, 13, 15, 10) against the first valve seat (9). In the valve bolt (13) a longitudinal bore (53) is provided extending over the entire axial length of the valve bolt (13).

Abstract: Particular embodiments of the present invention include devices and methods for relieving excess pressure or vacuum pressure from a tank interior. An embodiment of a pressure relief device includes a housing having an opening associated with a first end, an opening associated with a second end, and an over-pressure opening. The device further including a pressure relief valve for selectively relieving pressure from a tank, the valve including an over-pressure opening seal biased by a first pressure bias means against a pressure valve seat associated with the over-pressure opening. The device also including a guide block translatable in an axial direction of a second bore of the housing and being biased toward the pressure valve seat by a second pressure bias means. The guide block is translatable independent of the over-pressure opening seal. The device also includes a vacuum relief valve for selectively relieving vacuum pressure in the tank.

Abstract: A frictional engagement assembly for an automotive device, including: at least one frictionally engageable plate; a first piston plate displaceable in a first axial direction to urge the at least one frictionally engageable plate into frictional contact; a first resilient element engaged with the first piston plate and urging the first piston plate in a second axial direction substantially opposite the first axial direction; a check valve controlling fluid flow to displace the first piston plate; and an accumulator. As fluid from a chamber, at least partially formed by the first piston plate, discharges through the check valve, the accumulator controls fluid volume in the chamber to maintain a distal portion of the first piston plate, urging the at least one frictionally engageable plate into frictional contact, in a furthest position in the first axial direction.

Abstract: Disclosed is a fuel conveying device including a valve housing in which a pressure release valve and a non-return valve are arranged parallel to one another, the pressure release valve having a first inlet, which downstream of a valve seat opens into a valve chamber in which a valve body is movably arranged and which is in fluid connection with a second inlet for the non-return valve via a first outlet. The device improves the control response of the pressure release valve by providing the first outlet at the periphery of the valve chamber and in the axial direction with respect to a valve axis such that when the pressure release valve is open the flow from the valve chamber into the second inlet is a substantially radial flow.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flow path. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flow path. An unloading valve (100) has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. Means (120, 160) bias the valve element toward a third condition intermediate the first and second conditions.

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: An inflation valve includes a hollow sleeve having a first chamber and a second chamber; a first valve body located in the first chamber; a second valve body located in the second chamber; an air inlet connector screwed to an upper end of the second chamber; and a central pin assembly mounted in the air inlet connector. When an object being inflated by the inflation valve is excessively inflated, the inflation valve automatically releases surplus high-pressure air via at least one release pod of the second chamber by pushing the first valve body and the second valve body upward.

Abstract: An automotive vehicle includes a vehicle body and at least one reservoir containing a fire suppressant agent. A distribution system receives the fire suppression agent from the reservoir and conducts the agent to at least one location about the vehicle's body in response to the determination by a sensor system and controller that the vehicle has been subjected to a significant impact. The reservoir includes a multifunction valve element which controls pressure and vacuum within the reservoir during standby operation, while causing the fire suppressant agent to be directed through the distribution system if the propellant activates.

Abstract: A valve for use in regulating the flow of fluid between a first and a second fluid side is provided. The valve comprises a valve body and an aperture extending through the valve body. The aperture comprises an inner wall, a first aperture diameter at the first end of the aperture and a second aperture diameter at the second end of the aperture. The valve further comprises a first valve insert positioned in the aperture with a first insert diameter and a first mating feature. The first insert diameter is larger than the first aperture diameter. The valve further comprises a second valve insert having a first width, a second width and a second mating feature. The first width is larger than the second aperture diameter. The first mating feature cooperates with the second mating feature to engage the first valve insert to the second valve insert.

Abstract: One advantageous embodiment of the invention is a filter device (10) for filtering a fluid and providing three or more substantially continuous directions of flow therethrough. The filter device (10) includes a housing (12) having an entry port (18) and an exit port (20). The housing (12) has a filter medium (22) disposed therein for filtering the fluid that flows along a filtration-flow direction (24a) from the entry port (18) to the exit port (20). The filter medium (22) has a bi-directional valve (28) coupled thereto for selectively directing the fluid along a bypass-flow direction (24b) and a reverse-flow direction (24c) that is generally opposite to said bypass-flow direction (24b). The bypass-flow direction (24b) extends from the entry port (18) to the exit port (20) in bypass of the filter medium (22). Also, the reverse-flow direction (24c) extends from the exit port (20) to the entry port (18).

Abstract: A valve apparatus is disclosed for use in regulating the flow of fluid between a closed hydraulic loop and a fluid source in a hydraulic circuit, where the valve apparatus provides up to four different functions including a check valve, a neutral valve, a relief valve and a pressure rise rate valve. The apparatus includes a valve seat for selectively permitting fluid communication between the closed hydraulic loop and the fluid source, a sleeve member and a relief poppet in the valve seat, a relief compression spring inside the sleeve and positioned adjacent the relief poppet and the base of the slidable member, a valve guide and an accumulator piston slidably mounted within the valve guide to define an accumulator volume therein.

Abstract: Improvement in a combination valve including check valve and pressure relief valve portions for regulating fluid flow pressure and direction in a hydraulic circuit, wherein a valve seat includes, in addition to a central aperture, a plurality of peripherally-spaced axial cross-port orifice holes, of same or differing diameter and a plurality of intersecting, circumferentially-spaced, radial, semicircular holes; a spring cap including four adjoining axial portions of differing outer diameters, with a first portion being a protrusion that locates an end of a relief valve compression spring, a second portion having flat outer tool locating surfaces used for rotating the spring cap for axial adjustment relative to a valve stem, a third portion having a reduced radial wall thickness for easy crimping thereof relative to a valve stem, and a fourth portion having a coaxial recess for centering and physically retaining one end portion of a check valve compression spring.

Abstract: A bi-directional positive and negative pressure relief valve includes valve elements and flow passages that are configured to provide a fairly specific pressure distribution on the valve elements, and thus valve opening may be controlled in a more precise manner. The valve element and flow passage configuration results in a valve having a reduced size and weight, relatively higher rate and relatively smaller springs, and relatively smaller valve seat diameters. The bidirectional positive/negative pressure relief valve furthermore exhibits relatively high pressure and flow control accuracy, and exhibits good valve stability.

Abstract: A combination check valve and pressure relief valve is provided for use in regulating the flow of fluid between a first fluid side and a second fluid side. The valve may include a valve body, a valve insert positioned within an aperture of the valve body, a check poppet attached to the valve insert, and a check spring positioned between the valve insert and the valve body. In addition, a relief spring and a relief poppet may be positioned within a cavity formed by the valve insert and secured in position by the check poppet. The combination of the valve insert and the check poppet is adapted to move relative to the valve body and against the force of the check spring to permit fluid to pass from the first fluid side to the second fluid side, and the relief poppet is adapted to move relative to the check poppet against the force of the relief spring to allow fluid to pass from the second fluid side to the first fluid side.

Abstract: A lubricating oil supplying system for an internal combustion engine includes a lubricating oil storage section for storing lubricating oil. A driven pump is driven by the internal combustion engine to suck the lubricating oil from the lubricating oil storage section and discharge the lubricating oil to a discharge passage. An electric pump is provided for sucking the lubricating oil discharged from the driven pump to the discharge passage and discharge the lubricating oil to a lubricating oil requiring section in the internal combustion engine. A controlling mechanism is provided for drivingly controlling the electric pump in accordance with a control signal. A bypass passage is provided for bypassing the driven pump. A check valve is disposed in the bypass passage to allow the lubricating oil in the lubricating oil storage section to flow only through a path bypassing the driven pump and toward the discharge passage.

Abstract: A valve for use in regulating the flow of fluid between a first fluid side and a second fluid side of a hydraulic circuit. A bore is extended through a valve seat, and the bore and valve stem cooperate to form a fluid passage from the first side to the second side. A plurality of ribs are located on one side of the valve seat and extend in a direction generally parallel to the bore.

Abstract: A combination check valve and pressure rise rate valve is provided for regulating the flow of fluid between a first fluid side and a second fluid side. The valve may include a valve body, a valve insert positioned within an aperture of the valve body, and a check poppet attached to the valve insert. In addition, the valve may include a cylinder positioned within the valve insert, a piston slidably positioned within the cylinder, a spring positioned between the cylinder and the valve insert, and an accumulator formed between the cylinder and the piston.

Abstract: A valve arrangement in a hydraulic circuit comprises a longitudinal duct 3 and a transverse duct 2. A throttle slide 10 can be displaced in the direction of the longitudinal duct 3. Arranged in the throttle slide 10 is a valve piston 25, by means of which the flow through the hollow throttle slide 10 can be enabled or blocked. The flow of hydraulic fluid takes place through two groups of passage holes 33a, 35a, which are arranged in the throttle slide 10. The interaction of pressure and flow direction of the hydraulic fluid, and also the restoring force of a slide spring 20 and a piston spring 30, achieves a situation where hydraulic fluid can flow through the valve arrangement in both directions but that a throttling action occurs only when the hydraulic fluid flows from the transfer duct 2 to the longitudinal duct 3 under increased pressure.

Abstract: In the stationary part (1) of an axial piston machine, a first flow duct (2) and second flow duct (5) intersect with the central axes (3) and (6). A valve body (20) having a valve cone (21) and a tubular guide piston which can be displaced in relation to the valve cone is situated in the extension of the central axis (3) of the first flow duct (2). The valve body (21) bears against a first valve seat (4) which is surrounded by an expanded section (7). The entire valve body (20) moves in a tubular partial housing (9) which is connected to the stationary part (1) in a sealed manner via a seal (11), a screw connection (10) and a flange (12) which rests on a shoulder (13) of the stationary part (1). A first compression spring (27) and a second compression spring (28) serve to support the valve body (20) and its parts in relation to one another. An extension stem (22) passes through the tubular guide piston and guides the second compression spring (28).

Abstract: A combination valve for fuel delivery system of a vehicle having an engine, the fuel delivery system being configured to pump fuel to the engine and the fuel delivery system has a regulator for regulating the pressure of the fuel when it is being pumped to the engine by the fuel delivery system, the combination valve comprising: an outer housing defining an inner opening for slidably receiving a body portion of a system pressure relief valve therein, the body portion of the system pressure relief valve defining an inner opening for slidably receiving a body portion of a check valve therein, the body portion of the check valve being configured to provide a first fluid pathway in a first direction when the body portion of the check valve moves from a closed position to an open position as the body portion of the check valve moves in the first direction within the inner opening of the body portion of the system pressure relief valve, the body portion of the system pressure relief valve being configured to provid

Abstract: A valve assembly for use in regulating the flow of fluid between a first fluid side and a second fluid side of a hydraulic circuit. The valve includes a valve guide, a valve stem engaged to the valve guide and a valve seat. A bore is extended through the valve seat, and the bore and valve stem cooperate to form a fluid passage from the first side to the second side.

Abstract: A combination check valve and pressure relief valve is provided for use in regulating the flow of fluid between a first fluid side and a second fluid side. The valve may include a valve body, a valve insert positioned within an aperture of the valve body, a check poppet attached to the valve insert, and a check spring positioned between the valve insert and the valve body. In addition, a relief spring and a relief poppet may be positioned within a cavity formed by the valve insert and secured in position by the check poppet. The combination of the valve insert and the check poppet is adapted to move relative to the valve body and against the force of the check spring to permit fluid to pass from the first fluid side to the second fluid side, and the relief poppet is adapted to move relative to the check poppet against the force of the relief spring to allow fluid to pass from the second fluid side to the first fluid side.

Abstract: A combination inflation and relief valve having an inflation gasket mounted on a reciprocating stem head that separates from a valve seat of a valve body against the force of an inflation spring upon inflation and having a relief gasket mounted on a reciprocating push disk that separates from the stem head against the force of a relief spring to allow excess internal pressure to vent through relief holes.

Abstract: A valve assembly for use in regulating the flow of fluid between a first fluid side and a second fluid side of a hydraulic circuit. The assembly has an insert mounted in a hydraulic component having at least a portion of the hydraulic circuit formed therein, the insert also has a first end exposed to the first fluid side, a first end opening formed on the first end and a second end open to the second fluid side. The valve assembly additionally has a valve plug retained within the second end of the insert and a valve seat surface formed on the first end of the insert. The valve assembly also has a combination check valve and pressure relief valve located within the insert between the valve seat surface and the valve plug to selectively open and close the first opening.

Abstract: A two-way valve includes a valve case with the first valve seat formed at one of two openings, the first valve member movable in the valve case for abutting against the first valve seat, and the first urging device for urging the first valve member toward the first valve seat. The first valve member includes a communication path therein and the second valve seat formed at one end portion thereof. The second valve member for abutting against the second valve seat is disposed in the communication path to block the communication path, and the second urging device is provided for urging the second valve member toward the second valve seat.

Abstract: A decoupled check-relief valve for use in a hydraulic fluid circuit is provided that has a cylindrical guide housing which travels during the check function of the valve. The cylindrical guide housing has a clearance parameter, allowing for the selection of an optimal check response time. A dampening disk is provided inside the cylindrical guide housing, traveling within the guide during the relief function of the valve. The dampening disk has a separate clearance parameter, allowing for the selection of an optimal dampening capacity and fluid circuit stability. As such, the check and relief clearance parameters are independent of each other to allow both the check and relief functions of the valve to be optimized.

Abstract: A dual direction bypass valve allows a transmission filter to function whether or not it is placed in the vehicle transmission correctly. The filter includes a front and rear valve bodies separated by an end cap, and each having a spring and disk. When the filter media is clogged during normal forward flow, the fluid pressure on the rear valve body disk compresses the spring, opening an aperture in the end cap, allowing the fluid to pass from the front valve body through the rear valve body to the outlet, bypassing the filter media. If the transmission filter is placed in the engine backwards, the fluid pressure compresses the spring of the front valve body and opens up apertures in the end cap, such that the fluid flows through the apertures and the front valve body, bypassing the rear valve body and the filter media, to exit the filter.

Abstract: A combination check valve and pressure relief valve is provided for use in regulating the flow of fluid between a first fluid side and a second fluid side. The combination check valve and pressure relief valve includes a valve plug, a valve guide moveably positioned in relation to the valve plug, a valve stem engaged to the valve guide, a check compression spring attached to the valve stem and positioned between the valve guide and the valve plug, a valve seat carried by the valve stem, and a relief compression spring positioned between the valve seat and the valve guide. The valve guide is adapted to move the valve stem relative to the valve seat against the force of the relief compression spring to allow fluid to pass from the first fluid side to the second fluid side through a fluid flow passage formed between the valve stem and the valve seat.

Abstract: Apparatus for venting a container containing a fluid and including a poppet mounted to the bottom of a cap or flap mounted to a housing for being mounted to the container, a fastener for fastening the cap of flap to the housing and which fastener may be a fusible fastener for unfastening the cap or flap and for venting the container to the atmosphere upon heat applied externally to the container reaching a predetermined temperature. The poppet venting the container to the atmosphere upon the pressure in the container reaching a predetermined pressure and the poppet may be a combination poppet for venting the container to the atmosphere upon pressure in the container reaching a predetermined pressure and for venting the container to the atmosphere upon a vacuum in the container reaching a predetermined vacuum.

Abstract: A two-way valve includes a valve case with the first valve seat formed at one of two openings, the first valve member movable in the valve case for abutting against the first valve seat, and the first urging device for urging the first valve member toward the first valve seat. The first valve member includes a communication path therein and the second valve seat formed at one end portion thereof. The second valve member for abutting against the second valve seat is disposed in the communication path to block the communication path, and the second urging device is provided for urging the second valve member toward the second valve seat.

Abstract: A pump assembly for a penile implant is provided having a mechanism which prevents spontaneous inflation of the cylinders implanted within the user. The preventative mechanism uses overpressure generated by the reservoir during unintentional compression to effectively seal the pump assembly from unintended fluid flow. The prevention mechanism itself creates all necessary forces to prevent the undesired fluid flow to the cylinders. This is accomplished by incorporating appropriate mechanisms within the pump itself.

Abstract: In a power steering apparatus provided with a damper valve, the damper valve holds a partition member between a cap and the housing.

Abstract: A fuel shut-off safety device is mounted in a fuel injection system for an internal combustion engine. The fuel shut-off safety device includes a cylindrical body having a fuel passage and a valve seat, a piston disposed to slide in the fuel passage, a valve body to shut off the fuel passage when it is seated on the valve seat, a center bore connected to the fuel inlet, and an aperture connecting the center bore and the fuel passage, and a compression coil spring for biasing the piston to unseat the valve body from the valve seat.

Abstract: A decouple check-relief valve for use in a hydraulic fluid circuit is provided that has a cylinder guide housing which travels during the check function of the valve. The cylindrical guide housing has a clearance parameter, allowing for the selection of an optimal check response time. A dampening disk is provided inside the cylindrical guide housing, traveling within the guide during the relief function of the valve. The dampening disk has a separate clearance parameter, allowing for the selection of an optimal dampening capacity and fluid circuit stability. As such, the check and relief clearance parameters are independent of each other to allow both the check and relief functions of the valve to be optimized.