Abstract: A fluid-damped valve comprises a body defining an internal cavity having an inlet for ingress of a fluid and an outlet for egress of the fluid, and a closure member having a narrowed end portion. The closure member is movably disposed within the internal cavity intermediate the fluid inlet and the fluid outlet. The valve includes a seat configured to sealingly receive the closure member. The seat defines a constricted portion of the internal cavity configured to non-sealingly receive the narrowed end portion and damp the flow of the fluid through the fluid-damped valve.

Abstract: A non-return insert valve (100) for a fluid circuit, in particular of a vehicle, this valve (100) being configured to be inserted into a pipe (12) and comprising: a tubular body (102), a ring (104) comprising guides (140), a piston (106) configured to slidingly cooperate with said guides (140) and carrying a seal (146), and an elastically deformable member (108) for biasing said seal (146) in axial support against a seat (124) of the tubular body (102), said piston (106) comprising at its external periphery lugs (166) which are configured to be supported axially against an internal cylindrical shoulder (126) of said body (102), in order to precisely define a first position of the piston, the fluid being intended to flow between these lugs (166) when the piston (106) is in a second position.

Abstract: A valve assembly for a reciprocating gas compressor includes a seat, a guard plate attached to the seat, elements, and springs is presented. The seat defines inlet openings, each inlet opening extends through the seat along a central longitudinal axis of each inlet opening. The guard plate defines element bores, each element bore aligning with one of the inlet openings along the central longitudinal axis. Each element includes a first end with a first recessed surface and a second end with a second recessed surface, the first end and the second end cooperating to define a cylindrical shape therebetween, and an extension protruding outward from the outer diameter of the element. Each element is positioned within one of the element bores and movable between an open position in which the element contacts the guard plate and a closed position in which the element contacts the seat.

Abstract: The present invention relates to adjustable flow control valves, for example to an Adjustable Pressure Limiting (APL) valve. The adjustable valve (2) described comprises a valve body (4) comprising a valve seat (6), a valve member (10) movable relative to the valve seat (6), a first valve cap (20), a second valve cap (50) and a biasing element (30) to bias the valve member (10) away from the first valve cap (20). The first valve cap (20) is movable to increase the biasing force applied by the biasing element (30). The second valve cap (50) is engageable with the first valve cap (20) to prevent such movement of the first valve cap (20) beyond a selected position, but to allow movement of the first valve cap (20) in an opposite direction, way from said position.

Abstract: A leak stop assembly for an automatic shut-off fluid nozzle having a fluid flow path and a check valve with a through bore in the flow path. The assembly includes a bleeder seat that houses a length of the flow path proximate the check valve, a rubber plug, and a rigid cross-brace attached to the bleeder seat and holding the plug. Fluid flows around the check valve when open. The cross-brace positions the plug relative to the check valve through bore such that the plug seals against the check valve through bore when the check valve is closed.

Abstract: An apparatus for draining a bioreactor vessel includes a tubular body portion having an interior passageway, and at least one aperture in the tubular body portion providing for fluid communication with the interior passageway, the tubular body portion being configured for positioning at a bottom of a vessel, and a suction tube having a first end configured for fluid coupling with the tubular body portion, and a second end configured for fluid coupling with a port in a sidewall of the vessel.

Abstract: A flow control device includes a valve body defining an inlet, an outlet, and a flow path. A valve seat assembly includes a fitting coupled to the valve body, a seat ring coupled to the fitting and defining a valve seat. The seat ring includes an inner groove formed on an interior surface of the seat ring. A control element is movable relative to the valve body between a closed position, in which the control element engages the valve seat, and an open position, in which the control element is spaced away from the valve seat. The seat ring is coupled to the fitting by snap-fit connection such that a portion of the fitting is disposed in the inner groove of the seat ring.

Abstract: A pressure valve including a body including at least one admission opening and at least one discharge opening, a slide valve sliding in the body, the slide valve defining a chamber, with the body, and including a head arranged facing a seat of the admission opening, a spring pressing the head of the slide valve against the seat, a lip for applying the head to the seat. The head includes at least one hole bringing the chamber into communication with the discharge opening, each hole being arranged facing the seat and downstream from the lip in relation to the admission opening in order to reduce the pressure in the chamber by a Venturi effect when the slide valve is open.

Abstract: A variable flow rate valve mechanism includes a valve, a lock member, a valve attachment member and a spring washer. The valve includes a valve body and a valve shaft. The lock member is fixed to the valve shaft. The valve attachment member is attached to the valve shaft. The spring washer is disposed adjacent the valve attachment member. The spring washer is formed into an annular shape around an axis of the spring washer. The spring washer includes a support portion, a deformable portion and a protrusion portion. The support portion includes a seat surface and an open surface. The deformable portion is connected to the support portion and extends in an inclined manner. The deformable portion includes a contact surface and an opposite surface. The protrusion portion protrudes from at least one of the open surface of the support portion and the opposite surface of the deformable portion.

Abstract: A valve includes a valve housing, a piston, a support element, and a spring. The piston and the valve housing are arranged coaxially to each other on an imaginary valve axis. The piston is received in the valve housing in an axially movable manner against the spring force of the spring. The spring is supported on the support element and on the piston. The valve housing is provided with a first opening through which a fluid can flow and which can be closed by a piston base of the piston. The valve housing is provided with a second opening which can be at least partly closed by a piston casing of the piston and through which the fluid can flow. The piston casing extends outwards from the piston base in the axial direction of the support element and surrounds the valve axis.

Abstract: A valve bonnet has an elongated cavity to accommodate a spring-loaded valve stem, an upper surface, and tapped holes exposed at the upper surface. A bonnet accessory for the valve bonnet includes a fixture plate with holes formed in a predetermined hole pattern that matches a hole pattern of the tapped holes of the bonnet. The bonnet accessory includes threaded fasteners, each of which has a length to position the fixture plate at a predetermined height above the upper surface of the bonnet. The threaded fasteners have first ends to threadedly engage the tapped holes on the bonnet and second ends aligned with the holes in the fixture plate and retained on the fixture plate. The bonnet accessory includes a loop fastener that is retained on the fixture plate. The bonnet may be lifted by applying a pull force to a loop portion of the loop fastener.

Abstract: The invention in question pertains to the technological field of refrigeration compressors. A hermetic compressor for positive displacement is disclosed whose airtight housing is specially altered so that its natural frequencies of vibration are distributed at frequencies above 4200 Hz and whose “capacitance density” is greater than 160 W/L.

Abstract: A piston check valve system includes a body including an upstream end and a downstream end, a bonnet secured to a proximal opening of the body, and a piston secured within the body, the piston being moveable between a closed position in which the piston rests upon a valve seat and an open position in which the piston is spaced away from the valve seat. The piston check valve system also includes a retainer configured to guide and retain the piston and to secure the valve seat within the body.

Abstract: A control valve assembly of a variable cam timing phaser of a variable cam timing system, with the variable cam timing phaser including a housing and a rotor, and with the variable cam timing system including a camshaft, includes a valve housing extending along an axis. The valve housing includes a threaded portion adapted to engage the camshaft, and a body portion spaced axially from the threaded portion. The body portion defines a body interior. The control valve assembly also includes a piston disposed in the body interior and moveable along the axis between a first position and a second position. The control valve assembly further includes a cap removably coupled to the body portion of the valve housing. The cap includes a torque driving element configured to be received by a tool for transmitting torque from the tool for fixing the cap to the body portion.

Abstract: Flow control valves may be positioned downstream of water meters to increase pressure and compress entrained water vapour passing through the meters. However, turbulence within such valves can cause the valve's head to move radially, bending a shaft within the valve which may break. Accordingly, there is provided a flow control valve comprising: a housing having a flow passage; a valve seat defined within the flow passage; a valve head moveable to a closed position to engage the valve seat and seal the flow passage; a shaft secured to the valve head; a support slidingly mounting the shaft within the housing; a spring biasing the valve head to the closed position and configured to maintain the valve head in the closed position until a predetermined pressure is applied; and a guide assembly extending along at least a portion of the flow passage to constrain radial movement of the valve head.

Abstract: An in-line valve includes an in-line plunger having angled tooth cam surfaces mounted for non-rotational sliding along a conduit, and an in-line ported piston having angled tooth cam surfaces mounted to slide and rotate along the conduit. The angled tooth cam surfaces on the piston and plunger are resiliently biased in opposed facing relation so as to engage in rotationally sliding engagement over one another. This selectively indexes the piston into valve open and valve closed positions. The plunger is driven against the resilient return biasing of the piston by a modulated fluid pressure pulse from the fluid line attached to the valve. In the valve open position, a port in the piston passes the fluid through the piston and the plunger and along the fluid line. In the valve closed position, the port is closed off and the piston seals off the fluid flow through the piston and plunger.

Abstract: An integral check valve has a stem with a first interior bore extending longitudinally inward from a first end thereof and a spindle having a central shaft having a first end and an opposing second end with flange circumscribing the central shaft. The interior bore is sized to receive the stem and a portion of the central shaft extending from the first end to the flange. The integral check valve may be a component of a plumbing fixture that further includes a hollow body having a water inlet, a water outlet and an integral check valve receiving conduit. The integral check valve receiving conduit has threads sized to engage the outwardly extending threads of the stem.

Abstract: A connector-with-integrated-check-valve for minimizing microbial migration to catheter-tubing is formed from three parts: a connector-for-catheter-tubing that is hollow and with an internal valve seat; an elastomer gate (sometimes with disc and stem); and a connector-for-extension-tubing that is hollow and with support-surfaces.

Abstract: Needleless connectors are described herein. A needleless connector includes a body, a valve element at least partially disposed within the body, and a base. The valve element includes a cylindrical portion having an outwardly extending flange at a distal end. The flange has a bottom surface with an outer area and an inner area. The base includes a rim having a top surface that is in contact with at least a portion of the outer area of the flange of the valve element, the rim defining a recess with a bottom surface distally separated from the top surface of the rim, and at least one support member extending from the rim into the recess so as to contact the inner portion of the bottom surface of the flange.

Abstract: A valve seat is provided herein. The valve seat may include a ceramic valve seat insert positioned within a metal valve seat housing and comprising an indentation corresponding to a retention lip of the metal valve seat housing and a compliant sleeve positioned coaxially around at least a portion of an outer surface of the ceramic valve seat insert.

Abstract: A cap includes a cap body and a check valve. The cap body is attached to a spout of an ink container supplying an ink to one direction. The check valve has a check valve ball inside and prevents backward flow of the ink to the other direction. The cap body includes a first thread portion, a supplying port and a second thread portion. The first thread portion is screwed with an outer circumference face of the spout to seal the spout. The supplying port is provided inside the first thread portion and has an inner diameter smaller than the spout. The second thread portion is provided around the supplying port inside the spout. The check valve is screwed with the second thread portion.

Abstract: A valve seat for use in a fluid end of a fracturing pump that includes a first body portion having an inner wall and an outer wall, wherein the inner wall forms a fluid bore and outer wall is configured to contact an inside surface of a fluid passageway of a fluid end of the fracturing pump for support therein. The seat further includes a second body portion extending from the first body portion, the second body having a frustro-conical portion forming a seating surface for receiving a valve. A portion of the first and second body portion includes a hardened material insert forming a portion of the seating surface and a portion of the inner wall of the first body, and further includes a metallic body portion affixed to the hardened material insert, the metallic body portion forming at least a portion of first body portion outer wall.

Abstract: An apparatus for controlling flow of a fluid in a fluid conduit may include a closure member having an outer circumferential surface defined by a composite geometry, a biasing member applying a biasing force to the closure member, and a sealing member receiving the closure member. A fluid seal is formed in the fluid conduit when the biasing member presses the closure member against the sealing member.

Abstract: A device to increase a person's awareness of his or her breathing rhythm is disclosed. The device includes a clip, an air deflection plate, and a hinge connecting the air deflection plate to the clip. The air deflection plate may rotate about the hinge, relative to the clip. The air deflection plate may at least partially occlude a user's nostril when the clip is attached to the user's nose.

Abstract: A valve device includes a float body and a valve body provided in an upper portion of the float body to obliquely move. The valve body includes a seal portion that closes a valve opening formed in a case when the float rises, an engaging portion serving as a linkage portion with respect to the float body, and an abutting portion that abuts on a vicinity of the valve opening when inclining obliquely. An area of the abutting portion in the horizontal direction is made smaller than that of the seal portion such that the abutting portion laterally protrudes from the seal portion.

Abstract: An attracting assembly is positioned at an upper location to attract bed bugs. A killing assembly is positioned at an intermediate location beneath the attracting assembly to kill the attracted bed bugs. A base assembly is positioned at a lower location beneath the killing assembly for maximizing the number of bed bugs attracted and killed. A control assembly has a user visible digital UPC code, a battery power percentage indicator with an ON/OFF button and a sound activated switch, a cell phone with a macro-lens for wide angle photography with enlargements, and two light emitting diodes positioned adjacent to the macro-lens to illuminate bed bugs to be photographed.

Abstract: A venting arrangement for use with power transfer assemblies of the type used in motor vehicle driveline and drivetrain applications includes a vent oil deflector assembly. The vent oil deflector assembly is associated with an inside wall within an enclosed chamber and is configured to deflect lubricating oil splashed within the chamber away from an air venting passageway. The deflection feature and the venting feature are integrated into a common assembly.

Abstract: A moving assembly has a base with a base bottom, a side wall, a rectangular conduit formed in the base bottom, and a fan with a motor mounted on the base bottom, and a collector box for collecting mosquitos. The fan functions to create a vacuum for drawing in mosquitos. A killing assembly has an upper dish and a lower dish. The upper dish has electrically charged wires. A pool in the lower dish constitutes a container for standing water. Air tubes are laterally spaced and vertically oriented. The air tubes have upper ends disposed above the pool to draw in mosquitos entering the vicinity of the upper ends and lower ends received in the rectangular conduit.

Abstract: The invention is directed to a closing member of a valve, for example of a gas valve, comprising a body generally circular around a longitudinal axis and with a shoulder, a rubber seal packing disposed around the body on the shoulder and a sleeve disposed around the seal packing and the shoulder. The body comprises a longitudinally extending surface adjacent the shoulder and receiving the seal packing, the surface comprising at least one recess filled by the seal packing.

Abstract: A disconnect fitting adapted for use with a phase changing composition including a fitting base having a first fitting base end, a second fitting base end and a fitting base opening therebetween, a pin capture disposed within the fitting base opening, a displaceable pin secured within the pin capture, a fitting socket having a first fitting socket end, a second fitting socket end, a fitting socket opening therebetween, the second fitting socket end secured to the second fitting base end, and a valve at least partially disposed within the fitting socket opening. When the displaceable pin is in an unloaded condition, the displaceable pin extends in a direction of the second fitting base end, and when the displaceable pin is in a loaded condition, the displaceable pin is compressed in a direction of the first fitting base end. The pin capture permits passage of the phase changing composition through the fitting base opening when the displaceable pin is in the unloaded condition or the loaded condition.

Abstract: A constant pulling force winch control system includes a sensor that senses a degree of winding of a winch cable around a winch drum, and a control system configured to control a winch motor to achieve a constant pulling force on the winch cable based on the degree of winding sensed by the sensor. The sensor may be a position sensor that measures a position of the winch cable relative to a centerline of the winch drum as the degree of winding. The position sensor may sense an angular position of a tension plate relative to a tensioner shaft to measure the degree of winding. The winch motor may be a hydraulic winch motor or an electric motor, and the control system is configured to control the power applied to the hydraulic winch motor to achieve the constant pulling force based on the degree of winding sensed by the sensor.

Abstract: A control valve includes a seat portion through which the fluid passes, a poppet valve portion configured to move relative to the seat portion, a guide cylinder portion configured to guide the fluid having passed through the seat portion by an inner peripheral surface thereof, a poppet guide portion which is in sliding contact with the inner peripheral surface of the guide cylinder portion and supports the poppet valve portion, and a rectifying slit which is formed on at least one of the inner peripheral surface of the guide cylinder portion and an outer peripheral surface of the poppet guide portion.

Abstract: A hydraulic pressure source includes an oil tank for storing hydraulic oil, a hydraulic pump, a motor for driving this hydraulic pump, and an inverter for changing a rotational frequency of the motor. A pipe line for drawing the hydraulic oil from the oil tank by operation of the hydraulic pump branches to a supply pipe line for supplying the hydraulic oil to the hydraulic cylinder, and a release pipe line for releasing superfluous hydraulic oil into the oil tank. The release pipe line has arranged thereon a pressure regulating mechanism and a flowmeter which measures a flow rate of the hydraulic oil flowing into the release pipe line. Based on a measurement value of the flowmeter, the inverter is operable to change the rotational frequency of the motor to become a necessary minimum rotational frequency.

Abstract: A vent for a motor vehicle transmission includes a housing attached to a bell housing of the transmission. A plate is mounted in the housing, and the plate has an open position to enable heat to dissipate from the interior of the bell housing through an opening of the housing and a closed position to prevent debris or water from entering through the opening of the housing into the interior of the bell housing. The vent is a passive vent with a biasing mechanism that moves the plate to the open position when an interior temperature of the bell housing reaches a predetermined temperature threshold and moves the plate to the closed position when the interior temperature of the bell housing falls below the predetermined temperature threshold.

Abstract: A structure for attaching an oil jet valve includes a bracket secured to an internal combustion engine with a seal member, an attachment concavity extending through the interior of the bracket, an insertion hole extending through the interior of the internal combustion engine, an oil jet valve, a first stepped part formed in the oil jet valve, a second stepped part formed in the attachment concavity, and an interlocking member. The width of a wide part of the first stepped part is less than the width of a narrow part of the second stepped part. The width of the wide part of the first stepped part is less than the width of a portion, of the inner surface of the attachment concavity, that faces the wide part of the first stepped part.

Abstract: A fuel injector is provided that creates variable spray characteristics to effectively reduce emissions, such as NOx emissions and particulate matter. The injector includes a nozzle valve element of the outwardly opening type including a fuel delivery passage and spray holes. The nozzle valve element is operable to move to a low lift position to cause fuel flowing from the spray holes to impinge on the injector body and to deflect toward the combustion chamber, and to move to a high lift position to cause fuel flowing from the spray holes to avoid impingement on injector body and flow in an obstructed manner directly into the combustion chamber. An annular chamber may be formed in the nozzle valve element adjacent the spray holes to receive fuel.

Abstract: A pressure relief valve includes a one-piece combined plug that includes a seat at one end, a spring guide at another end, and a plug between the seat and the spring guide. A central bore extends through the spring guide and the plug and a branch channel extends outward from one end of the central bore.

Abstract: In a check valve for a compressor, a valve element includes an abutting surface and an outer circumferential surface. A valve hole includes a large-diameter portion and a small-diameter portion. A communicating window has such a shape that an opening area thereof gradually becomes larger with increasing distance from a valve seat. The check valve has an open state, a fully closed state, and a buffering state. When the abutting surface separates from the large-diameter portion and the outer circumferential surface opens the communicating window, the open state is defined. When the abutting surface closes the large-diameter portion and the outer circumferential surface interrupts communication through the communicating window, the fully closed state is defined. When the abutting surface separates from the large-diameter portion and the outer circumferential surface interrupts communication through the communicating window, the buffering state is defined. The hunting phenomenon is suppressed.

Abstract: To provide a check valve which can be used even under a high temperature condition by overcoming a drawback “valve element sticking to sealing member” associated with high temperature use while enhancing heat resistance. An opening of a fluid path formed in a first body is brought into a closed state by bringing a valve element biased by a biasing member into contact with a sealing member. The sealing member is formed of a post-cured perfluoro elastomer packing. An annular sealing portion which is brought into line contact with the sealing member is formed on the valve element.

Abstract: A spring element includes a disc-shaped basic body, in which at least one spring bridge is inserted. The basic body has at least one dynamic throttle point to throttle a fluid flow. The basic body has a resilient configuration in a region of the at least one throttle point. Accordingly, an opening cross section of the at least one throttle point is configured to be set variably depending on a pressure difference.

Abstract: A lube system is provided and includes an air-oil tank including a deaerator configured to remove a first quantity of oil from a first air-oil supply to generate a second air-oil supply having a second quantity of oil, which is smaller than the first quantity of oil, the air oil tank being configured to output the second air-oil supply to an air vent line, a de-oiler disposed along the air vent line and configured to remove from the second air-oil supply oil mist including oil droplets of a minimum size and a system disposed between the deaerator and the de-oiler, which is configured to encourage formation of the oil droplets of at least the minimum size.

Abstract: A leaf valve structure according to this invention comprises an annular valve seat, and a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid on an inner side of the valve seat. A recessed depression portion having an opening portion on both an inner periphery of the valve seat and a seating surface of the leaf is formed in the valve seat, thereby creating a site where the pressure of the working fluid on the inner side of the valve seat can act more easily on a seating surface between the valve seat and the leaf valve. Accordingly, an effect of a surface adsorption force applied to the leaf valve by the valve seat on a cracking pressure can be suppressed, and as a result, the leaf valve can be lifted under a stable cracking pressure.

Abstract: A nipple of a check has a first portion that is selectively positionable within a housing of the check valve. A second portion of the nipple extends from the housing when the first portion of the nipple is selectively positioned within the housing. The check valve is configured to allow fluid flow through the check valve in either a first direction or a second direction when the first portion of the nipple is selectively positioned within the housing. The check valve is configured to prevent fluid flow through the check valve in the first direction when the first portion of the nipple is removed from the housing.

Abstract: A slam-shut device includes an inlet, an outlet, a valve seat, and defines a flow path. A valve disc is shiftable between an open position and a closed position, and reset pin responsive to an actuator is coupled to the valve disc and shifts between an untripped position and a tripped position. A cylindrical cage is mounted within the valve body and is disposed in the flow path, and includes a plurality of flow apertures slidably receives the valve disc. The cage includes a first end adjacent the valve seat and a second end away from the valve seat, and the cage forms a cylindrical recess disposed adjacent the second end of the cage and spaced from the flow apertures.

Abstract: In one featured embodiment, a spring assembly for a valve comprises a spring, a spring seat including a cup-shaped portion for seating one end of the spring, and a ball received within a recess formed within the cup-shaped portion of the spring seat. The ball is defined by a ball diameter. A disc prevents the ball from contacting a piston. The disc is defined by an outer diameter and includes a center opening defined by an inner diameter. A ratio of the inner diameter to the ball diameter is between 0.60 and 0.65.

Abstract: A valve provided for the blocking or controlled establishment of a volume flow of a working fluid in a flow path of a technical device that transmits and/or stores energy, in particular in a control device for a hydraulic drive, an associated method of manufacture of the valve, and an apparatus with the valve. The valve includes first, second, and third valve openings, a moveable shut-off body moveable between an open-position and a close-position, a guide which guides the shut-off body between the open-position and the close position, and a retainer which exerts a retaining force on the shut-off body in the close-position. The guide has three guide parts. The first and third guide parts enclose the shut-off body and the second guide part includes a plurality of pins in a parallel orientation to the direction of movement of the shut-off body.

Abstract: An improved valve assembly having an integral single piece housing (1) having an inlet (15), an outlet and defining an inwardly extending wall forming a valve seat (3); a valve member (4) moveable within the housing (1) between a closed position and an open position and a seal (11) to form a fluid tight seal between the valve member (4) and the valve seat (3) when the valve member is in the closed position. The seal (11) also acting to retain the valve member (4) within the housing (1) and in which the housing defining end portions which extend axially away from the valve member (4) at any position of the valve member between the open and closed positions.

Abstract: The invention relates to a safety valve for a cryogenic insulated gas cylinder, which comprises a valve body, and the valve body further comprises a gas inlet flow channel, a valve seat, a slide way, a valve core and a spring, a gas inlet connecting thread and an adjusting nut. An adjusting nut exhaust hole set on said adjusting nut, a spring set between the said adjusting nut and a spring bracket with an exhaust hole. A valve assembly further comprises the valve core, a plurality of guide rings, a positioning steel ball and a valve flap, a valve core exhaust hole is provided in the valve core. The safety valve has high stability in discharge pressure and return pressure, high repeatability and good sealing performance, and is firm in structure, difficult to be damaged and high in safety.

Abstract: A valve for regulating the flow of fluid through an access port in a fluid chamber includes a body having a first end and a second end, the second end being located in the access port and the first end protruding outside of the access port. An axial bore extends from the first end to the second end, an injection fitting is formed at the first end of the body in fluid communication with the axial bore, and the second end of the body includes a selective sealing interface. The body forms a sealing interface with a threaded inner wall surface of the access port. A one-way valve assembly is positioned within the axial bore, and is arranged to permit a flow of fluid therethrough in a downstream direction and prevent the flow of fluid therethrough in an upstream direction. A bypass passageway extends from the selective sealing interface separate from the axial bore. A connecting passageway connects the bypass passageway with the axial bore upstream of the one-way valve assembly.

Abstract: In the relief valve, an annular convex portion 16a that is convexed in a direction in which a valve element 5a moves away from a valve hole 17 along a center axis of the valve hole 17 and that is arranged around the valve hole 17 is formed in a valve chamber 16, an annular concave portion 5d that is concaved in the direction in which the valve element 5a moves away from the valve hole 17 is formed in the valve element 5a, and in a shut-off state, the annular convex portion 16a is accommodated in the annular concave portion 5d, and an annular channel 19 that extends in a direction of the center axis is formed between an outer peripheral surface 16b of the annular convex portion 16a and an inner peripheral surface 5e of the annular concave portion 5d.