Abstract: An umbrella valve includes an umbrella-valve body having a stem, a flexible umbrella, and a flange. The umbrella and the flange are each attached to, and extend radially outward from, the stem. The flange has at least one fluid passage. The umbrella valve can be placed in a valve housing having a sealing-surface portion. The umbrella, when the umbrella-valve body is placed in the valve housing, is pushed away from the sealing-surface portion under a forward fluid flow and is pushed against the sealing-surface portion under a reverse fluid flow. An umbrella-valve assembly includes the umbrella valve and the valve housing.

Abstract: A one-way valve with an annular nozzle. The valve body is a truncated cone with an interior fluid manifold. The truncated cone section includes a lower retaining groove and a fluid groove. A fluid conduit connects the interior fluid manifold to the fluid groove. An elastic cylinder having an internal diameter which is smaller than the truncated cone is slipped over the truncated cone. The lower portion of the elastic cylinder slips into the retaining groove. The upper portion rests over the fluid groove. When fluid pressure within the interior fluid manifold exceeds the pressure outside the valve, fluid flows through the conduit and into the fluid groove. This pressure urges the upper portion of the elastic cylinder away from the truncated cone Fluid then flows out through an annular nozzle formed between the upper portion of the elastic cylinder and the upper portion of the truncated cone.

Abstract: A telescopic snap valve assembly and method of assembling a snap valve with a liquid holding bag in a box fitting. The valve assembly includes a valve member having a lower protruding telescopic end with a raised exterior lower edge. The telescopic end of the valve member is inserted into the center opening of the fitting so that the raised exterior lower edge snaps outward and protrudes from the bottom of the fitting locking the valve member to the fitting. Tight fitting between the telescopic end of the valve and the fitting, with or without a seal member such as O-ring, and the like further seal the valve member to the fitting so that no liquid becomes trapped and/or leaks from the assembly. The assembly can use a ball check valve, and can dispense all types of liquids and fluids such as but not limited to juice with pulp without clogging the valve.

Abstract: A connector housing of a valve-equipped connector is integrally formed from a tube connection section at a first axial side; a pipe insertion section at a second axial side; and a valve housing section between the tube connection section and the pipe insertion section. The valve housing section is formed with an adequately large inner diameter. A main valve body and a compression coil spring for biasing the main valve body to the first axial side so that it abuts the inner surface of the housing are stored in the valve housing section. A cylindrical bushing is fitted to the first axial side of the pipe insertion section of the connector housing, and a valve cap for receiving a second axial end of the compression coil spring is formed integrally at the first axial end of the cylindrical bushing.

Abstract: A free floating disc check valve is provided by the present application. The check valve includes a seal disc having an integral truncated torroidal shaped portion. The torroidal shaped portion provides structural rigidity to the seal disc to minimize deflection of the disc under higher differential fluid pressures. The torroidal shaped portion of the disc cooperates with finger-shaped projections inside the valve body to limit lateral displacement of the disc relative to the axial flow of the fluid. The torroidal shaped portion and the flat portion of the disc form a cup shape that creates a hydrodynamic force that assists in moving the disc to an opened or closed position. The seal disc is made of an elastomeric material that is coated with a dry film lubricant.

Abstract: A back flow prevention device is shown for use in a plastic pipeline for conveying water, sewage, hydrocarbons or other fluids. A valve body features a flow control mechanism which is formed entirely or primarily of plastic materials. The valve body and its opposing ends are formed of a plastic material which is compatible with the plastic material of the existing pipeline, whereby the valve body can be installed in the pipeline in co-axially fashion by directly joining the opposing ends of the body to the opposing mating pipe ends at a selected location within the pipeline.

Abstract: A rotary connector with valve, comprising first and second connector members (1, 2) having connector terminal parts (5, 6) and fitting parts (7, 8) with hollows (3, 4) as fluid passages formed therein and a valve member (12), wherein the first and second connector members are rotably connected to each other by fitting the fitting parts thereof to each other and the valve member is stored in a valve storage part (11) formed in the fitting part, valve pressing parts (14, 15) are provided on the first and second connectors (1, 2) on the side of the valve storage part, and at least a part of the valve member is pressingly held between the both valve pressing parts to hold a sealability, and a frictional force acting between the both valve pressing parts and the valve member is set so as to come within such a range that the first and second connector members can be rotated each other, whereby a structure allowing an easy assembly and an absorption of the twist of a line can be provided.

Abstract: A rotary connector with valve, comprising first and second connector members (1, 2) having connector terminal parts (5, 6) and fitting parts (7, 8) with hollows (3, 4) as fluid passages formed therein and a valve member (12), wherein the first and second connector members are rotatably connected to each other by fitting the fitting parts thereof to each other and the valve member is stored in a valve storage part (11) formed in the fitting part, valve pressing parts (14, 15) are provided on the first and second connectors (1, 2) on the side of the valve storage part, and at least a part of the valve member is pressingly held between the both valve pressing parts to hold a sealability, and a frictional force acting between the both valve pressing parts and the valve member is set so as to come within such a range that the first and second connector members can be rotated each other, whereby a structure allowing an easy assembly and an absorption of the twist of a line can be provided.

Abstract: A connector housing of a valve-equipped connector is integrally formed from a tube connection section at a first axial side; a pipe insertion section at a second axial side; and a valve housing section between the tube connection section and the pipe insertion section. The valve housing section is formed with an adequately large inner diameter. A main valve body and a compression coil spring for biasing the main valve body to the first axial side so that it abuts the inner surface of the housing are stored in the valve housing section. A cylindrical bushing is fitted to the first axial side of the pipe insertion section of the connector housing, and a valve cap for receiving a second axial end of the compression coil spring is formed integrally at the first axial end of the cylindrical bushing.

Abstract: A back flow prevention device is shown for use in a plastic pipeline for conveying water, sewage, hydrocarbons or other fluids. A valve body features a flow control mechanism which is formed entirely or primarily of plastic materials. The valve body and its opposing ends are formed of a plastic material which is compatible with the plastic material of the existing pipeline, whereby the valve body can be installed in the pipeline in co-axially fashion by directly joining the opposing ends of the body to the opposing mating pipe ends at a selected location within the pipeline.

Abstract: A flow control device for installation in a bore in a compliant housing comprises a central flow control mechanism and generally cylindrical body with an outer surface having a base diameter and comprising a plurality of annular ridges, coaxial with the device, arrayed in an axial series and separated by grooves, and projecting radially outward above the base diameter of the device, and a method of securing a flow control device within a bore formed in a compliant housing, comprises the steps of forming the outer surface of the device to have a generally cylindrical shape and a base diameter and comprising a plurality of annular ridges, coaxial with the device, arrayed in an axial series, separated by grooves and projecting radially outward above the base diameter of the device, the base diameter formed or selected to be slightly less than the inside diameter of the bore, and pressing the device into the bore to the desired location at a rate not exceeding the rate at which the material of the housing displac

Abstract: A pipe element possessing a longitudinal axis (2) along which a rigid tubular part (3) and a flexible tubular part (4), together constituting a single piece, extend. The rigid part (3) has one end presenting a substantially radial connection surface (8) for connection to an end portion (11) of the flexible part (4), and an additional connection surface (10) on the radial connection surface (8) connecting to the end portion (11) of the flexible part (4), at least a part of the additional connection surface (10) extending substantially parallel to the longitudinal axis (2).

Abstract: A quick connector with a one-way flow valve includes a bearing cage mounted in a bore of a female component housing and supporting a tip end of a conduit lockingly held in the housing by a retainer. A projection extends from one end of the bearing cage and spaces a flow ball movably mounted in the housing bore at a first, flow permitting open position wherein flow paths between the male and female components are established around the exterior of the flow ball and between circumferentially spaced ribs formed in the housing and supporting the flow ball. The flow ball is automatically movable in response to a reverse direction acting fluid pressure differential to a second, flow-blocking position in sealing engagement with a valve seat formed in the housing bore to prevent reverse fluid flow through the connector.

Abstract: A flow control valve coupling structure that does not require complicated machining and facilitates the installation of a flow control valve. The coupling structure includes a fitting portion having a male thread that is formed on a peripheral surface of the flow control valve. A coupled member has a coupling hole to receive the flow control valve. A cylindrical elastic sealing member is engaged with the coupling hole to seal the space between the flow control valve and the coupling hole. The elastic sealing member has an inner surface defining a mounting hole in which the fitting portion is fitted. A female thread is formed on the inner surface and is mated with the male thread of the fitting portion.

Abstract: A circular check valve with a central aperture is disclosed. The preferred use as a standing head valve for reducing hydrostatic pressure in a wellbore being produced by a reciprocating pump is discussed. In this application the circular check valve allows the a sucker rod, or equivalent source of pumping energy, to pass. The device is attached to the pump barrel in communication with pump chambers and the production tubing. The check valve device isolates the pump internals and the formation from the hydrostatic head of the produced fluid. The device eliminates pump-off and thus fluid pounding resulting in more efficient pumping and less maintenance. Other uses for the circular check are described.

Abstract: A circular check valve with a central aperture is disclosed. The preferred use as a standing head valve for reducing hydrostatic pressure in a wellbore being produced by a reciprocating pump is discussed. In this application the circular check valve allows the a sucker rod, or equivalent source of pumping energy, to pass. The device is attached to the pump barrel in communication with pump chambers and the production tubing. The check valve device isolates the pump internals and the formation from the hydrostatic head of the produced fluid. The device eliminates pump-off and thus fluid pounding resulting in more efficient pumping and less maintenance. Other uses for the circular check are described.

Abstract: A back flow preventing valve is formed of a valve main body and a valve member. The valve main body includes a fluid inlet at one side, a fluid outlet at the other side having a valve seat at an end surface thereof, a flange extending outwardly from an outer periphery thereof and located between the fluid inlet and outlet, and a bent portion situated inside the valve main body near the fluid outlet for changing a flowing direction of a fluid flowing through the valve main body. The area of the fluid outlet is greater than that of the fluid inlet. The valve member is pivotally connected to the valve main body and urged toward the valve seat. The valve member is opened when a fluid entering from the fluid inlet is ejected from the fluid outlet, and closed when the fluid does not flow from the fluid inlet to the fluid outlet.

Abstract: A flapper valve assembly (110) having a biasing flapper closure assembly (102) is disclosed. The flapper valve assembly (110) comprises tubular valve housing (94) having a hinge (100) and a longitudinal hole (104). A valve seat (92) is mounted within the housing (94) having a flow passage therethrough. A flapper closure plate (86) is rotatably disposed within the housing (94) about the hinge (100). The flapper closure plate (86) is rotatable between a valve open position and a valve closed position. The flapper closure plate (86) has a notch (132) on the side opposite its sealing surface (114) that is spaced a distance (136) from the hinge (100).

Abstract: A check valve connectable in a refrigerant line is economically fabricated from only three parts--(1) a copper tubing body connectable in the refrigerant line, (2) a nonmetallic shutoff ball, and (3) an annular valve seat member having a conically tapered seating surface on one of its ends. The seat member is coaxially received within a first end of a longitudinally central portion of the tubing positioned between spun-down opposite end portions thereof, with the seating surface end of the seat member facing the second end of the central tubing portion, and the ball being received in the central tubing portion for axial movement into and out of sealing engagement with the seating surface. Three circumferentially spaced, axially elongated side wall indentations are formed in the central tubing portion.

Abstract: A urinal for men who cannot use a toilet or are otherwise incapacitated has a canister with a removable spout. A manual seal in the spout can be manipulated between open and closed positions by a trigger on the exterior of the spout, and locked into the open position by a releasable locking arm. A vertically-arranged opening in a dome seal attached to the spout helps prevent spillage in the event the urinal is knocked onto its side when the manual seal is locked open. The spout is attached to the canister by a releasable collar, and thus can be easily separated for cleaning.

Abstract: A tank isolation valve assembly for use in an effluent discharge path to provide a vapor barrier to prevent back flow of gases while enabling fluid and solid substances to pass through in a desired flow direction. The assembly includes a main housing having an apertured outlet wall structure with an internal surface defining a valve receiving region, a second member coupled to the main housing and having an apertured wall structure with a valve member retaining surface facing the valve receiving region, and an isolation valve member. In one embodiment, the second member is a mating inlet housing with an inlet for connection to an effluent discharge port, and the main housing has an outlet port and a valve chamber. In another embodiment, the second member is a valve plate with a dished peripheral portion in sealed contact with a portion of the inner surface of the main housing. The isolation valve member is a flexible diaphragm mounted in the valve chamber in sealing relation therewith.

Abstract: An apparatus for preventing slippage of the ends of pipes, which may be broken, from within a Dresser-type coupling utilized for mending such breaks. A slip stop ring member is provided for preventing slippage of a washer to the end of the pipe.

Abstract: The present invention is directed to a multi-cuspid back-flow preventer in the nature of a check valve that has a generally annular body portion with axially spaced upstream and downstream ends. A substantially cylindrical passageway extends through the body portion, and a plurality of circumferentially adjacent valve cuspids are connected to the downstream end of the body portion for selectively opening and closing the passageway that extends therethrough. Each valve cuspid is marginated by a rib that extends into the passageway. Breather slots are provided between the successively adjacent valve cuspids, and a mounting flange may be provided at the upstream end of the body portion.

Abstract: A backwash valve for use in a sucker-rod actuated fluid pump, may be selectively actuated to permit both the standing and traveling ball valves to be unseated at the same time permit the pump to be backwashed and/or the production tubing string drained.

Abstract: A fluid flow check valve assembly having a tubular valve housing with opposite inlet and outlet end portions and a movable valve member therebetween. The valve member has an end sealing portion engageable with an inlet seating portion of the housing and a flexible annular lip seal portion engageable with the inner wall of the housing. When the assembly is in a first pre-assembly condition which exists prior to insertion of the end of a mating outlet tube into the housing, the valve member assumes a mid-portion in the housing spaced away from the inlet seating portion. In this pre-assembled condition, the valve member's lip seal portion is seated against the inner wall of the housing thereby blocking fluid flow through the check valve assembly. The insertion of an outlet tube into the housing moves the valve member from the preassembly mid-position toward the inlet end of the housing and into a second one-way controlled flow condition.

Abstract: An apparatus for conveying thick matter is provided including a delivery line, a thick matter pump connected to the delivery line for conveying thick matter from the pump through the delivery line in an output direction, and a restraining member positioned in the delivery line. The restraining member includes a first group of finger lamellae that are radially arranged and have openings therebetween. Each of the finger lamellae of the first group includes an end secured on the inner surface of the delivery line and an unattached end extending diagonally in the output direction and toward the inside of the delivery line. The finger lamella thereby define a pass-through opening therein for enabling flow of thick matter through the restraining member such that the pass-through opening increases in size when thick matter flows in the output direction and decreases in size when there is no flow of thick matter or when thick matter moves in a direction opposite to the output direction.

Abstract: A fluid check valve of the two flapper variety which has replaceable seat flapper assembly. The assembly comprises a tubular ring having a seating area on the surface of one end and a reduced diameter portion on the other end. A pair of pin keepers are attached to opposite sides of the seat ring and the flappers are pivotably attached to a pin that passes through elongate holes in the keepers. The seat ring is a sliding fit in the bore of the valve body and abuts against an annular rib in the valve body bore. The reduced diameter portion of the seat ring extends through the annular rib. A retaining ring is attached to the reduced diameter portion by threaded engagement, bolts, or other means and tightened until it abuts against the other side of the annular rib thus holding the seat ring in tight assembly in the valve bore against the rib.

Abstract: The present invention relates to a reverse-flow prevention device for a fuel tank of an automobile which is provided between a filler port and the fuel tank in the automobile. The reverse-flow prevention device of the invention comprises a valve body of which circular interior space is divided into three to six sector-shaped regions and which includes a support bar provided in alignment with the division lines, and three to six valve discs having configurations to be closely fitted in the sector-shaped regions of the valve body and rotating around the support bar. Bearings of the support bar for rotation of the valve discs are provided with rotation-restriction sections which control the valve discs to rotate within a range of not more than 90.degree. as well as in one direction.

Abstract: An air gap apparatus particularly adapted for use in reverse osmosis (RO) units in which reject water must be carried off to a drain line. The apparatus is adapted for incorporation in an RO unit as original equipment or for addition later as an after market item. It provides air gap protection against backsiphoning, and also includes a deflector wall and supplemental opening for shunting to atmosphere any high velocity backflow from the drainage line. Various forms of check valves are disclosed for use with the air gap apparatus to provide further protection against contamination of the potable water system by backflows, the check valves being adapted in certain embodiments for connecting together conduit sections within which the check valves have been installed. Also, a compact and inexpensive form of trap is disclosed for use in systems which do not include a conventional drain trap.

Abstract: Even if a bellows is provided in the vicinity of a fuel check valve to be installed between a fuel filler port and a tank, the valve can be operated stably with a structure in which a valve body of the check valve comprises an annular main body section and a tubular extension section extending over the substantially whole length of the inner peripheral side of the bellows.

Abstract: A flapper valve assembly when closed permits flow through in one direction and prevents flow in the opposite direction. When open, two way flow may occur and the flapper valve member is biased toward closed position, to sealingly engage an annular seat, by one or more springs in the wall of the flapper valve housing. This structure provides a greater closing force applied to the flapper valve through a tension member connected to the flapper valve hinge. Three forms of tension members are disclosed.

Abstract: A check valve apparatus for a fuel tank of an automobile or the like compries only two members, i.e., a valve plate made of synthetic resin which is integral with rotating rod members and a valve body made of synthetic resin and having an annular configuration which is integral with bearings or the valve plate. The check valve apparatus is simple in structure and easy to assemble. During operation after it has been assembled, it will not easily dislodge from a pipe, and when the operator intends to detach it from the pipe, it will be readily detached.

Abstract: An improvement in devices for the thermostatic control of engine coolant comprises a radiator hose with an internally mounted thermostatic valve. In one embodiment of the improved device, a flexible hose has a radially inwardly projecting annular flange on which the radially outwardly projecting annular flange of a conventional thermostatic valve may seat. In another embodiment, the annular flange of a thermostatic valve is modified to permit it to be clamped onto a coil of a helical spring held coaxially within a flexible radiator hose. The improved thermostatic coolant control devices eliminate the requirement for gaskets, gasket cement, and unbolting and bolting metal parts together heretofore, required for the replacement of thermostats.

Abstract: A check valve for a fluid conduit line including a spaced break in a fluid conducting line with a chamber defining sleeve connecting opposed ends of the broken fluid line, the chamber having a float fluid check valve disposed therein of a specific gravity lower that the specific gravity of the fluid in the line with opposed spaced ends of the broken line being contoured to remain open to the chamber when the float valve is urged thereagainst by line pressure.

Abstract: A check valve assembly is disclosed which is inserted in a fluid flow conduit leading from a source of fluid flow to a mechanism utilizing the fluid flow. The check valve assembly comprises a housing having an inlet port and an outlet port that communicate with a central chamber in the housing, and a valve disposed in the central chamber adapted to permit fluid flow from the inlet port through the chamber to the outlet port and prevent fluid flow from the outlet port through the chamber to the inlet port. The housing comprises a first attachment piece associated with the inlet port and adapted to be attached to the fluid flow conduit leading from the source of fluid flow, and a second attachment piece associated with the outlet port and adapted to be attached to one of several adapter elements. Various types of adapter elements are disclosed which include sections for connecting the adapter element to the second attachment piece and to the fluid flow conduit leading to the mechanism utilizing the fluid flow.

Abstract: A check valve sub assembly for series connection in a dual pipe string that extends downhole in a borehole for permitting flow of fluid in one direction through the annular passageway of the dual pipe string and preventing flow of fluid in the other direction. The check valve sub assembly includes an inner tube and an outer annular member for connection into series relationship respective to the inner and outer dual pipe so that fluid flow through the inner pipe is conducted through said inner tube and is maintained separate from the annulus.

Abstract: A mud saver valve for insertion within the drill string to retain mud in the drill pipe preventing the mud column from flowing past the valve when pumping is interrupted. The mud saver valve includes an internal check valve which permits increased flow of mud upward through the valve when a predetermined downhole pressure is reached. The increased flow of the check valve prevents a blow-out of the plug spear in the event sudden upward pressure is encountered. The check valve forms a part of the plug spear which is removable from the mud saver valve to facilitate the running of wireline tools.

Abstract: A flapper valve with a protective hinge pin sleeve. The valve includes a flapper assembly having a flapper with the protective hinge pin sleeve disposed through an ear of the flapper. The hinge pin sleeve is preferably made of a relatively harder material than the flapper to reduce wear on the flapper as the flapper assembly is pivoted on a pivot pin. One embodiment of a flapper valve for use in a down hole tool is disclosed.

Abstract: A reverse circulation deep hole rock bit that includes a drill bit connector tube telescopically extended into a drill bit housing to cooperatively form a part of a radial inner fluid channel for cuttings to flow axially outwardly and a radial outer annular clearnace space, a plurality of angularly spaced pressurized fluid passage that open to the annular space and a check valve in each fluid fluid passage to permit inward flow of fluid, but to block fluid flow in the opposite direction. A plurality of angularly spaced cutter arms have arcuate tubular segments secured to axial and radial outer portions of the arms while a radially inner tubular skirt is secured to or abuts against the axial outer portions of the arms.

Abstract: A snap-on valve sleeve for a check valve designed to be rigidly and sealingly secured within the end of an elastomeric tube. The sleeve includes a plurality of inwardly disposed barb segments positioned in mating alignment with an annular protrusion positioned about the outer surface of the valve body. The annular protrusion comprises an upward rearwardly sloped surface and a flat step surface perpendicular to the outer surface of the valve body. The check valve is inserted into the end of the tube. The outer edge of the end of the tube slides over the step surface positioning the tube along a partial length of the valve body. The sleeve is positioned over the forward end of the valve body and forced along the length of the valve body until the barb segments ride up the upward rearwardly sloped surface and then snap over the sloped surface to compress and seal the tube between the valve body and sleeve.

Abstract: A check valve is disclosed, which comprises a hollow cylindrical valve body and a pair of substantially semicircular symmetrical valve plates. The valve body has a pair of ear-like bearing projections projecting in a diametrically opposed relation to each other from an open end. The valve plates each have a straight edge with an integral pivot pin provided on one end portion and an integral bearing portion provided at the other end. The two valve plates are joined together by inserting the pivot pin of each of them through the bearing portion of the other. The pivot pins of the joined valve plates are fitted in the bearing projections of the valve body such that the valve plates can be pivotally moved when they are opened and closed.

Abstract: The improved poppet valve of the present invention comprises a simpler and shorter valve which meets or exceeds prior art performance characteristics while being easier and cheaper to make and to fabricate into a float collar or float shoe. The improved poppet valve of the present invention comprises a tubular one-piece body having flange means on the exterior thereof, and a downward-facing valve seat at the bottom interior thereof, with a valve guide spider thereabove. A dome-shaped poppet valve seats on the aforesaid valve seat, and has coaxially secured thereto a upwardly extending stem bolt which protrudes through and above the valve body guide spider. A spring disposed about the stem bolt biases it upwardly, acting on the top surface of the spider and on a lower surface of a spring retention cap secured to the top of the stem bolt. In such a manner, the poppet valve is biased into engagement with the valve body seat at the lower end of the valve assembly.

Abstract: A boring head for duo-pipe drilling apparatus comprises a body having a passage for material return extending therethrough from the cutting end to the coupling end, the passage having an inlet at the cutting end displaced from the axis of rotation of the head and extending substantially across the full radius thereof, and an exit at the coupling end co-axial with the axis of rotation. The cutting end comprises one or more teeth having attacking edges overlying the inlet and beveled for mechanically displacing material into the inlet upon rotation of the head. Fluid supply galleries open into the passage for directing pressurized fluid from the duo-pipe system towards the exit of the passage for flushing cut material to the exit. The coupling end of the boring head is adapted for connection to the duo-pipe system with the annular passage of the duo-pipe system in communication with the fluid supply galleries and with the inner tube of the duo-pipe system in communication with the exit of the passage.

Abstract: A novel vertical ball-check valve for a sanitary diaphragm pump with a unitary housing and valve seat, an elastomeric ball, preferably hollow to respond to low pump pressure, and a removable ball stop to permit removal of the ball for inspection and cleaning of the valve housing. The ball, passageway, and ball stop are sized relative to each other to provide space for solids which have passed through the valve seat to be discharged from the outlet end without stalling the valve. A method for total visual inspection of the ball-check valve without removing the check from the system is also disclosed.

Abstract: A valve seal assembly for use in well cementing equipment in well cementing operations and the like having an elastomeric seal positively, mechanically retained on the valve body head so that movement of the elastomeric seal on the valve body stem and with respect to the valve body head is prevented.

Abstract: Check valve adapted for being mounted in and sealed to a tube made of elastomeric material. The valve has an elongated outer hollow body made of thermoplastic material, said body being adapted to be telescoped for a substantial portion of its length into the end of the elastomeric tube.

Abstract: A pressure relief device for pneumatic conveying lines to serve as a safety device in the event of an explosion or sudden pressure increase within the conveying line. The device includes a pair of semi-cylindrical shells normally joined together by a shear pin or pressure sensitive key which ruptures when excessive pressure in the conveying line exerts excessive force on the shell sections. When the joining device ruptures, the shell sections open up to relieve line pressure. A suitable mounting arrangement is provided including guide bars for the shells, bumpers and spring return arrangement.

Abstract: A mounted check valve assembly to be installed between two fluid vessels comprises a check valve having a cylindrical body annularly bulged midway, a pipe securely fixed at one end to one of the vessels and engaged at the other end with one end of the check valve, and a hose connected at one end to the other vessel and fitted at the other end over the check valve and farther over the end portion of the pipe to support the same.

Abstract: An operably automatic valve assembly for being received in a cavity of a short drill string subassembly, preferably a kelly saver subassembly, for preventing mud spills when the kelly assembly is disconnected when adding additional sections of drill pipe. An eccentric butterfly disc across the valve opening is biased closed by suitable air spring action. Fluid pump pressure in excess of the bias pressure opens the disc and telescopes closed the air springs located on either side of the valve housing within suitable pockets. A stop on one air spring and not on the other causes a slight twist to the disc as the disc reaches its full open position and eliminates any operating flutter of the disc. Pressure within the stem in excess of the closing bias pressure provided by the air springs keeps the disc open even in the presence of back fluid pressure.

Abstract: Coupling joint seals, for oil well head high pressure control equipment particularly for the assemblies of riser tubes thereof on wireline equipment, have the coupling containing a seal constructed and arranged to permit the use of a rigid non-extrusion ring, preferably of yellow brass, as a retainer or back up ring as an element of the seal. The arrangement includes a groove cut into a cylindrical surface of a coupling member that enters an annular slot therein that shall contain the seal means to be disposed therein. The rigid non-extrusion ring is screwed or threaded through the groove and into the annular slot.