Abstract: A safety valve is for controlling dispensing of a fluid flow from a conduit. A valve body forms an inlet opening of the fluid, an outlet opening of the fluid, and a main passageway for the fluid which fluidly connects the inlet opening to the outlet opening. At least one fluid relief opening fluidly communicates with the outlet opening through a valve seat. A shutter elastically cooperates with the valve seat to be biased by an elastic device to sealingly close the valve seat, and to open said seat when the pressure of the fluid in the outlet opening exceeds the force applied by said elastic device.

Abstract: A valve guide for a coupling including a circular, longitudinally extending portion, including a substantially circular channel extending therethrough; a ring portion; a plurality of ports radially disposed around a centerline of the valve guide; and one of more collar supports disposed radially about the circular, longitudinally extending portion. The valve guide comprises a unitary one-piece component. A male portion for a coupling that includes a valve guide with integral assembly support and a method for assembling a coupling assembly are also disclosed.

Abstract: The invention relates to a non-return valve, in particular for a refrigeration circuit or thermal circuit, which is insertable into a connection point (76) of a connection device (71), which comprises a supply opening (72) for supplying a medium and an outlet opening (74) for discharging the medium, comprising a multi-part housing (12, 14), which comprises a valve housing (14) and a main housing (12), which is interconnectable by means of connection elements (41, 42) via an interface (16), comprising a regulating space (24) formed between the main housing (12) and the valve housing (14), in which space a valve-closing member (25) is provided which abuts a valve seat (23) of the valve housing (14) in a closed position (54), and closes an opening (22) in the valve housing (14) and is movable into an operating position (55) counter to an actuating force of a return element (33) and releases the valve opening (22), wherein the valve housing (14) and the valve-closing member (25), which is arranged so as to be mov

Abstract: A tank tee assembly includes a tank tee body including a tank tee inlet, a tank tee outlet and a tank tee passageway therebetween. An annular flange is disposed on a peripheral surface of the tank tee passageway. At least one through-hole structure is disposed in the tank tee body downstream of the annular flange. A poppet valve assembly is disposed in the tank tee passageway between the annular flange and the at least one through-hole structure. The poppet valve assembly includes a poppet and a guide. The guide is rigidly secured within the tank tee passageway. The guide includes a guide base. The guide base has an outside diameter that is larger than an inside diameter of the annular flange. The tank tee passageway is free of any threaded connections between the annular groove and the at least one through-hole structure.

Abstract: A one-way valve includes: a cylindrical section, one end of which is inserted into and fixed to an inside of a pipe, the cylindrical section including a through-hole through which oil is passed in an axial direction; and a columnar section housed inside the pipe and including, in another end thereof, a plurality of lateral holes through which oil is passed, flow of oil being blocked when the other end is inserted into a one-side opening section of the cylindrical section.

Abstract: A reciprocating body (2) has valve element (6) including deflecting surface (10a), valve shaft (7) guided by guide cylinder (4), and packing (8) having an annular shape circularly brought into close contact with valve seat (12a) in a state where the reciprocating body (2) is in a closed position. The valve element (6) includes large diameter portion (9a), and small diameter portion (9b) and deflecting portion (10). The large diameter portion (9a) has flange surface (9d) supporting the packing (8) in a state where the packing (8) is exposed to the primary flow passage side. The flange surface (9d) is formed such that the flange surface (9d) is allowed to come into contact with the valve seat (12a) via the packing (8). Recess (9c) is formed on the outer periphery of the small diameter portion (9b), and a portion of the packing (8) is fitted in the recess (9c).

Abstract: A check valve is provided for use with, for example, variable frequency drives and other applications without the valve becoming misaligned. In one aspect, the valve includes a housing with an inner surface and a passage. A flange within the housing divides the housing into upstream and downstream portions, and extends around the inner surface, defining a valve seat and a valve aperture. A poppet is positioned in the downstream portion. The poppet includes a valve head and a stem extending from the valve head and into the downstream portion, and not through the valve aperture. The valve head is resiliently biased in the closed position against the valve seat to inhibit fluid flow in a first direction. A guide disposed within the housing receives the stem of the poppet valve as the poppet valve moves between an open position and a closed position. The guide is secured into place by a spring clip.

Abstract: A valve apparatus and system is provided. The valve apparatus includes a housing having a fluid inlet and a fluid outlet. A support assembly is attached to the housing, the support assembly including a positioning chamber located over the outlet. A diaphragm assembly is moveably attached to the support assembly. The diaphragm assembly includes a piston having one end slideably mounted in the positioning chamber, and a diaphragm attached to the other end of the piston. A sealing element is located about a perimeter of the diaphragm, and a biasing element is arranged to contact the support assembly and the diaphragm assembly, thereby urging at least a portion of the sealing element against the fluid outlet, providing a fluid-tight seal.

Abstract: A shut-off valve for integration into an intelligent gas meter for residential or industrial gas supply, has an inlet, an outlet and a valve seat having a lip seal. A shut-off body is longitudinally displaceable with respect to the valve by a motor driven transmission, using a nut-threaded-spindle drive, to engage with or disengage from, the seal to open or close the valve. The transmission of the valve remains largely unbiased in the closed state while maintaining the gas-tightness of the valve.

Abstract: A venting device for an animal feeder which has a feeding teat is disclosed. The venting device has a chamber with an opening into the chamber. A vent opening is also connected to the chamber. A sealing element is retained freely moveable in the chamber. The sealing element has a first surface positioned relative to the opening such that, in use of the feeder, feed in the feeder will contact the first surface and cause the sealing element to move to a sealing position on seat to close the chamber from the vent opening. The surface is configured such that when a negative pressure in the feeder acts on the surface and is sufficient to overcome the weight of feed acting on the surface, the sealing element will be drawn into a position where the chamber can communicate with the vent opening and thereby vent the feeder to atmosphere.

Abstract: A check valve is provided which comprises a casing having a fluid passage, a valve seat member disposed in the fluid passage, and a valve element housing with a valve element disposed therein. The valve seat member has a valve seat surface on an end surface facing downstream. The valve element housing is a discrete member separate from the valve seat member and detachably secured to a downstream end portion of the same. The valve element is displaceable between a closed position and an open position.

Abstract: A check valve is provided for use with variable frequency drives and other applications. In one aspect, the check valve provides a poppet guided by a poppet guide in at least two locations to ensure stability between fully open and fully closed positions. In another aspect, the check valve includes a poppet guide adapted to receive a poppet in a stem receiving channel, the stem receiving channel including guide vanes engaging the poppet and auxiliary channels for self cleaning. The check valve may also include a valve seal. In one embodiment, the valve seal is an o-ring received by a poppet head, based of the poppet guide and valve seat. The valve seat and/or the base may include expansion channels to receive a portion of the valve seat during compression when the check valve is in a closed position.

Abstract: A fuel system valve assembly may include a housing, a spring, and a body. The housing may have a fuel passage defined in part or more by a fuel passage wall. The fuel passage wall may have a seat and a cylindrical section. The cylindrical section may have a constant diameter and may be located downstream of the seat. In use, the body may reciprocate linearly in the housing between an open position and a closed position. The body may be biased to the closed position by the spring. The body may abut the seat when the body is in the closed position.

Abstract: A check valve is provided for use with variable frequency drives and other applications. In one aspect, the check valve provides a poppet guided by a poppet guide in at least two locations to ensure stability between fully open and fully closed positions. In another aspect, the check valve includes a poppet guide adapted to receive a poppet in a stem receiving channel, the stem receiving channel including guide vanes engaging the poppet and auxilliary channels for self cleaning.

Abstract: A device for shutting off the flow in pipelines, hoses or the like, in particular a non-return valve having a housing for installing in a pipeline or the like. The housing has a flow channel, of which the flowed-through cross section can be closed by a valve, the valve having a valve disc for closing the cross section and a valve stem for guiding the valve and the valve being mounted by means of the valve stem in a retaining plate, so as to be displaceable in the direction of flow.

Abstract: The invention concerns a pump having a housing; a working chamber located in the housing for delivery of a fluid; a suction channel which is in flow connection with the working chamber for guiding the fluid into the working chamber; a valve unit disposed in the suction channel, the valve unit has a guide body, a limiting element which is guided for displacement in the guide body and has at least one displacement stop for limitation of displacement, a valve which is movable between an open position and a sealing position for controlling the flow of the fluid into the suction channel, wherein the valve is guided for displacement, and a pressure element which presses the limiting element in the direction of the sealing position of the valve; as well as a pressure channel which is in flow connection with the working chamber for guiding the fluid out of the working chamber.

Abstract: The regulator comprises at least a cylinder (2) with a fluid inlet connector (1) for receiving fluid at an inlet pressure and a fluid outlet connector (4) for delivering fluid, at least one chamber (3), a rod (5) in said cylinder with one side submitted to the inlet pressure and the other side submitted to the outlet pressure generating a net force counter-balanced by at least one spring means (7) acting on one side of said rod (5) against said inlet pressure, wherein a fluidic pathway is formed between said rod (5) and said cylinder (2) as the major fluidic resistance of the device, wherein a change of the inlet pressure induces a move of the rod along the axis of the cylinder thereby modifying the fluidic resistance of said fluidic pathway, wherein the fluidic resistance of said pathway varies with the applied pressure at the inlet in a predefined range of pressure, inducing a regulated flow rate in the considered range of pressure.

Abstract: A valve includes a stem, a cap, and a deformable lip. The stem includes a first sealing portion and has a longitudinal axis. The cap is connected to the stem and includes a passageway. The deformable lip extends from a periphery of the cap and includes a second sealing portion. The stem is displaceable relative to the deformable lip along the longitudinal axis of the stem to open the first sealing portion and close the second sealing portion to allow fluid to move through the passageway in the cap.

Abstract: An excess flow valve having a housing, a valve seat, a poppet and an adjusting ring. The adjusting ring lies within a bore in the housing and there is an opening through the housing permitting access to the adjustment ring from outside the bore of the housing. Rotation of the adjusting ring controls the maximum travel distance between the poppet and the valve seat. In an embodiment a travelling valve guide is rotatably mounted within the adjustment ring to change the maximum travel distance between the poppet and the valve seat. A spring may bias the poppet and the valve seat away from each other.

Abstract: A check valve for a combustion engine fuel system includes a polymeric poppet valve including a valve stem and a valve head that terminates the valve stem. A valve seat is adapted for cooperation with the valve head of the poppet valve, and includes a valve seat body and an elastomeric valve seat seal supported by the valve seat body and adapted for sealing against the valve head of the poppet valve. The check valve is particularly adapted for use with a fuel pump within a fuel system.

Abstract: A Gas regulator capable of reducing the pressure of a gas supply from thousands of psi to as low as 30 psi with an accuracy level of +/?1 psi. The regulator uses at least two oppositely oriented gas stages to reduce the pressure. The first stage performs gross pressure reductions and subsequent stages perform fine pressure reductions. The regulator easily connects to commercially available gas bottles and can easily activate or deactivate gas flow without needing to disconnect the gas bottle. The regulator has a compact design and can provide readings which can be integrated into computer, online, or dynamic systems.

Abstract: A valve assembly having a threadless base and a removable threadless insert that separately contains a check valve piece. The check valve piece is resiliently supported to abut a seal fitted to the insert. In one assembly, a pair of resiliently biased latch arms restrain the insert to the base. Flanges at the latch arms are resiliently biased to flex and grip the base as the insert is pushed into the base. Insert removal is effected with the release and lifting of the latch arms. In another assembly, the insert is magnetically coupled to the base and a resiliently biased check valve piece and setscrew adjuster regulates flow pressure.

Abstract: A device for shutting off the flow in pipelines, hoses or the like, in particular a non-return valve having a housing for installing in a pipeline or the like. The housing has a flow channel, of which the flowed-through cross section can be closed by a valve, the valve having a valve disc for closing the cross section and a valve stem for guiding the valve and the valve being mounted by means of the valve stem in a retaining plate, so as to be displaceable in the direction of flow.

Abstract: A valve assembly having a base and a removable latched insert that separately contains a valve piece. The valve piece is resiliently supported to abut a seal fitted to the insert. The insert is restrained to the base with a pair of resiliently biased latch arms that radiate from the insert. Flanges at the latch arms are resiliently biased to flex and grip the base as the insert is pushed into the base. Insert removal is effected with the release of the latch arms and a lifting of the latch arms.

Abstract: A tank which is primarily intended for spraying applications and mountable on an all terrain vehicle (“ATV”). The tank (10) includes a main tank section (11) which, in use, extends laterally of the ATV and at least one longitudinally extending arm 12. The pump assembly is located in a cavity (14) in the underside of the main tank section (11). A cover (15) can cover the cavity (14) to mount the pump assembly in place. The tank (10) can include a removable auxiliary tank (21).

Abstract: An inlet or outlet valve for a pump comprises a closing body (3) pretensioned by a spring element (4). The closing body (3) can open or close a passage on a valve seat (2). The valve also comprises a guide element (5) for guiding the closing body (3). Inside the guide element (5), the closing body (3) is guided at least on a first guiding area (9) and a second guiding area (10).

Abstract: Provided is a hydrostat for a portable gas range, which prevents the explosion of a gas container by automatically discharging overcompressed gas from the gas container when the inner pressure of the gas container increases to an explosion pressure. The hydrostat includes a body including a gas outlet, which communicates with a gas inlet of the governor valve, and a sealed room, which communicate with the gas outlet. An opening/closing unit is installed within the sealed room of the body such that it can elastically move up and down in order to discharge overcompressed gas by opening the gas outlet when the inner pressure of the gas container reaches or exceeds a threshold value of deformation. A cap is fixed at the bottom of the body so as to support the opening/closing unit and has a discharge hole for discharging overcompressed gas, which escapes the gas container through the gas outlet.

Abstract: Hydraulically or pneumatically controlled seat valve (2), in particular a pressure control valve, having a valve seat (10) formed in a base part (4) which cooperates with the sealing surface of a valve body (8) displaceably disposed in a cover part (6), wherein the base part (4) and the cover part (6) are connected to each other, the base part (4) having an at least sectionally circumferential collar (18) which faces radially outwardly for mounting the seat valve (2) to a further component (60), in particular to a housing, using a welded joint.

Abstract: Poppet valve installation or removal is simplified through the use of a unitary poppet assembly that may be accurately placed into a valve body through an access opening and wherein the poppet is slidably mounted in a stem in an insert while being permanently affixed thereto by the interference fit between a shoulder on the poppet stem and a post within the sleeve.

Abstract: In order to solve the problem of a conventional attachment structure of a fuel tank made of resin, the present invention is an attachment structure of a component of a fuel tank made of resin where a connection portion with a tank main body made of resin is formed of a thermally depositable material, and which tank comprises a joint portion connected with the tank main body by a thermal deposition and an inner tubular member supported by the joint portion and housed in the tank main body, wherein a movement regulation mechanism for regulating a movement in an axial direction of the inner tubular member for the joint portion is provided at least at one of the joint portion and the inner tubular member, and the joint portion and the inner tubular member are formed by an integral molding.

Abstract: A valve for controlling a fluid flow, in particular for crankcase venting of an internal combustion engine, including a base body (37), a valve body (22) and a biasing means (23), the base body (37) having a valve side (45) and an opposite side (46) situated opposite the valve side (45), a part of the valve body (22) protruding through an opening (47) situated in the base body (37), the biasing means (28), in particular a compression spring, being arranged between the opposite side (46) of the base body (37) and the valve body (22) and supported against the opposite side of the base body (37).

Abstract: A check valve for a compressed gas system. The valve has a body with an internal passage extending through the body and a valve seat positioned in the passage. A poppet is movable between a closed position in which the poppet engages the seat to block flow of gas through the passage and an open position in which the poppet is spaced from the seat to permit flow of gas. A retainer mounts the poppet in the passage and guides movement of the poppet. A spring urges the poppet to the closed position such that the poppet is responsive to pressure of the gas exceeding a predetermined value to move the poppet away from the seat against the urging of the biasing member and to the open position.

Abstract: An inlet or outlet valve for a pump comprises a closing body (3) pretensioned by a spring element (4). The closing body (3) can open or close a passage on a valve seat (2). The valve also comprises a guide element (5) for guiding the closing body (3). Inside the guide element (5), the closing body (3) is guided at least on a first guiding area (9) and a second guiding area (10).

Abstract: Hydraulically or pneumatically controlled seat valve (2), in particular a pressure control valve, having a valve seat (10) formed in a base part (4) which cooperates with the sealing surface of a valve body (8) displaceably disposed in a cover part (6), wherein the base part (4) and the cover part (6) are connected to each other, the base part (4) having an at least sectionally circumferential collar (18) which faces radially outwardly for mounting the seat valve (2) to a further component (60), in particular to a housing, using a welded joint.

Abstract: The invention relates to a backflow preventing check valve (1) comprising a housing (2) in which a closing member (3) is arranged. The closing member is moveable between a closed position and an open position and is disposed on a valve seat with a sealing area in the closed position. A pressure-compensation device is provided for when the backflow preventing check valve is closed and a volume of fluid is sealed off on the outflow side. In order to counteract an undesireable high pressure load when the check valve is closed, the outflow area defined by the closing body (3) in a closed position is joined to at least one pressure compensation chamber (6) whose receiving volume corresponds approximately to the expansion volume of the sealed-off fluid and which is disposed outside the area which is defined on the outflow side.

Abstract: A check valve for a compressed gas system. The valve has a body with an internal passage extending through the body and a valve seat positioned in the passage. A poppet is movable between a closed position in which the poppet engages the seat to block flow of gas through the passage and an open position in which the poppet is spaced from the seat to permit flow of gas. A retainer mounts the poppet in the passage and guides movement of the poppet. A spring urges the poppet to the closed position such that the poppet is responsive to pressure of the gas exceeding a predetermined value to move the poppet away from the seat against the urging of the biasing member and to the open position.

Abstract: A suction valve including a valve seat and a piston movably joined to the valve seat. The piston has a head for engaging the top surface of the valve seat and a stem extending downwardly from the head through the valve seat. A valve guide is positioned adjacent the bottom surface of the valve seat and slidably receives the stem. A valve keeper is fitted upon the stem such that the valve guide is disposed between the valve seat and the valve keeper. A keeper pin is slidably positioned within a transverse aperture in the stem and abuts the bottom of the valve keeper. A compressed spring is positioned between, and exerts opposing forces upon, the valve guide and the valve keeper so as to normally retain the head of the piston in engagement with the top surface of the valve seat.

Abstract: A check valve attached to an inner wall of a main body of a fuel tank ensures a sufficient seal of the main body from outside, without increasing the required number of parts. The check valve communicates with a fuel conduit of a fuel inlet pipe and functions to prevent liquid fuel and fuel vapor in the main body from flowing through the fuel inlet pipe and being released to the outside. The check valve is opened by a flow of fuel in the fuel inlet pipe and allows the flow of fuel to be introduced into the main body. The check valve includes a casing with a fuel outlet, a valve disc, and a fixation plate. The valve disc is movable between an open position and a closed position to open and close the fuel outlet of the casing. The fixation plate has one end inserted in an end of the casing and the other end welded to the main body. This arrangement enables the main body to be securely sealed from the outside.

Abstract: A water hammering prevention device including an outer box defining a flow path having an inlet, an outlet and a drain port in a midstream section thereof. An inner tube member has a diaphragm on its periphery dividing the inside of the outer box into an upstream section, and an area consisting of a midstream section and a downstream section of the flow path. A relief valve is provided and is caple of moving toward or away from a valve seat located on the periphery of a valve port provided between the midstream section and the downstream section. A check valve is provided inside the inner tube member to prevent fluid from flowing backward from the downstream side, and to discharge pressurized fluid generated by water hammering to the outside via the drain port.

Abstract: A valved fitting is provided which includes a body having a first end and a second end spaced from the first end, with a fluid passage extending through the body between the first and second ends. A valve seat is defined on the body within the fluid passage, and a valve assembly is removably disposed within the fluid passage for controlling flow through the fluid passage. The valve assembly includes a valve head that is engageable with the valve seat in sealable relation therewith. A higher flow area, and thus a higher flow rate, are achieved with the fitting of the invention as compared to conventional fittings which utilize a single-piece body with a Schrader valve, because the valve seat is defined on the body, and the valve head is engageable with the valve seat. Further, the valve assembly is removable, thereby allowing the valve assembly to be replaced when needed. The valved fitting of the invention is particularly useful on a service valve block for an air conditioning system.

Abstract: The invention relates to a valve nozzle used for a molding machine of synthetic resin and is characterized in that a gate opening and closing mechanism consisting of a spool having a head portion at which a circular cross-sectioned part and a notched part are formed, a shaft portion and an arrow feather shaped projection, and a coil spring which presses the abovementioned spool in the direction opposite to the gate, is disposed in the interior space of a nozzle head attached to the tip end of a nozzle holder via a screw mechanism, when resin pressure is less than a certain fixed level, the abovementioned spool is pressed by the abovementioned coil spring in the direction opposite to the gate and the entire periphery of the circular cross-sectioned portion of the head portion of the spool is brought into contact with the interior wall of the gate of the nozzle head to cause the resin flow path to be closed, and when the resin pressure becomes higher than a certain fixed level, the head portion of the abovement

Abstract: A low profile valve for discharging pressurized air to a system for utilizing such pressurized air. The valve includes a housing for mounting in or to an associated structure, and has at least one opening through which pressurized air is directed to and from the valve. A piston is located in the housing for axial movement therein, and the piston has a face portion containing a seal for sealing the piston against a fixed surface of the associated structure. In addition, a spring can be located about the piston for biasing the piston in the direction of the fixed surface.

Abstract: An axial recess is formed in the downstream end of the diffuser body. An annular tail member is mounted on the downstream end of the valve piston. The tail member retracts into the recess when the piston is in the closed position and provides an extension of the diffuser body when the piston is in the open position.

Abstract: The invention relates to a sanitary safety device which is interposed in a water-supply line and there is insertable in an opening in the region of a coupling point or joint. It is characteristic of the sanitary safety device according to the invention that the sanitary safety device has a flow regulator (2) or similar restrictor as well as a backflow preventer (3), these being combined in the sanitary safety device to compose a constructional unit in the form of a cartridge (1). Such is insertable for example, in the opening of a recess in the form of a cartridge mount provided in a hose connector. The cartridge (1) composed of the flow regulator (2), backflow preventer (3) and any strainer attachment (8) at the inflow end can thus be interposed in a water-supply line in a simple fashion and with little effort.

Abstract: A ball valve is provided with an internal check valve which is of modular construction and with an external valve casing that includes a lateral extension defining an access port. The modular check valve assembly is threadably connected to the ball and the lateral extension is closed with a threadable closure. The threadable closure for the lateral extension and the threadable check valve assembly both have sockets to receive access tools and both sockets preferably have the same unique tamper proof configuration to receive the same access tool.

Abstract: A fitting (1) designed for example as a non-return valve (2) has an outer housing (3) having an inner lip seal (7) interacting with a closing element (5), and also an outer annular seal (8). Both the outer housing (3) and the seals (7, 8) are designed as injection moldings. The production of the outer housing with the seals takes place in an injection molding process in which, first of all, the outer housing and, in a second operation, the seals are injection molded. If appropriate, more than two operations, in particular in the case of more than two injection molding material components, can also be provided. By means of the injection molded seals, the latter are durably and closely bonded to the outer housing (3) resulting in simplifications regarding production technology and design (FIG. 1).

Abstract: A pressure release apparatus for relieving pressure that may occur within a pipeline due to water hammers or the like. This apparatus is secured to the pipeline directly in line with the pressure wave and consists of a spool piece having an opening therethrough which is selectively biased in the closed position. When pressure within the pipeline is sufficient to overcome this bias, the opening is unblocked thereby permitting such pressure to be released to the atmosphere. A blast shield surrounds this opening so that the sudden release of such pressure will not cause damage to surrounding people or property.

Abstract: The plunger of the valve has a semi-spherical valve member of reduced diameter, so that it is inwardly spaced from the ribs of the cage. The plunger is centralized and guided by top and bottom stems attached to the ball and working loosely in apertured webs carried by the cage and seat member. The cage has 2 or 3 ribs only, so that the windows are wider. The cage web is downwardly spaced from the top of the cage, to maximize the area of the cage outlet. The valve member has a reduced diameter neck at its upper end, to keep the valve member downwardly spaced from the cage web when the valve is fully open. As a result of these features the cross-sectional areas of the flow passage through the opened valve are increased. The stems are preferably straight-sided and the web openings are circular so fluid may flush out solids packing between the stems and webs. The valve has been improved to increase flow capacity and ensure line contact seating which can be maintained even though there is wear of the parts.

Abstract: A device relieves a positive pressure difference between the inside of a vessel and the outside of the vessel through an opening in the vessel. The device has a base portion, a cap portion and a biasing means. The base portion has a means for mounting the device in the opening; a cap seat providing an orifice through which the pressure difference may be relieved; and a generally hollow body portion attached to the cap seat and extending concentrically with the cap seat into the vessel. The cap portion has a cap having an external surface with a diameter larger than the diameter of the cap seat to retain the cap external to the cap seat in sealing relationship; a rod mounted concentrically and normal to the internal surface at one end, the other end extending into the body portion and terminating in a piston with a shoulder, the piston being in concentric sliding engagement within the body portion.

Abstract: A low pressure gas flow check valve is formed by a relatively thin disc having an central aperture and valve seat is adapted to be interposed between adjacent flanges in a pipeline. The check valve includes a valve body axially connected with one face of the disc. The valve body has inlet and outlet bores and a valve for seating on the valve seat and is surrounded by the bore of the pipeline. A spring normally urges the valve to its sealed position to prevent downstream fluid tending to flow in an upstream direction.