Abstract: A dual lock flow gate includes a valve with a flapper which may be fixed and/or locked in various positions for example to prevent fluid flow in the production string during lowering of the production string in the casing by blocking flow in the production string with the dual lock flow gate or for example to prevent rotation of the pump motor by preventing fluid flow in the production string.

Abstract: A dual lock flow gate includes a valve with a flapper which may be fixed and/or locked in various positions.

Abstract: A flap valve apparatus includes a main body; a valve body; and a spring member. The main body includes support shafts, and the valve body includes bearing portions. When viewed from the axial direction of the support shaft, the bearing portions has a bearing hole with an inner diameter larger than the outer diameter of the support shaft; and an introduction groove being in communication with the bearing hole from the seal surface side of the valve body. A width of the introduction groove is smaller than the outer diameter of the support shaft, but is expandable to receive the support shaft. When viewed from the axial direction of the support shaft, an opening portion of the introduction grove is positioned near the axial center of the main body.

Abstract: A valve flap device having at least one valve housing having a shaft comprising a bearing surface and a valve axis, the shaft being rotationally supported about the valve axis by means of the bearing surface in the valve housing. A bearing element having a sliding bearing surface, wherein the bearing surface of the shaft contacts the sliding bearing surface. A bearing housing provided on the valve housing, in which the bearing element is supported at least in the radial direction to the valve axis, wherein the bearing element has an outer surface contacting the bearing housing. The support of the shaft is intended to be sufficiently tightly sealed, even for gaseous media, while simultaneously ensuring precise and statically determinate support.

Abstract: A gear device for electric motor 1 which is combined with an electric motor installed in a vehicle, wherein a breather pathway 8 is provided in a gear box 2 where a row of gears for transmitting force of the electric motor is contained, the breather pathway connecting between an inside and outside of the gear box 2, and in the breather pathway 8, a closing valve system 10 is provided to close the breather pathway 8 when an outer pressure of the gear box 2 is lower in comparison to an inner pressure of the gear box 2 exceeding an acceptable range.

Abstract: A vacuum breaker includes a safe valve body and an elastic gasket. The safe valve body has a receiving space which has a periphery provided with connecting holes. The elastic gasket has a size smaller than that of the receiving space, with clearances being defined between the elastic gasket and the receiving space. The elastic gasket has a center provided with a through hole and has an outer periphery provided with a sealing portion. Thus, the sealing portion contracts inward when water stops passing the safe valve body, so that ambient air flows into the receiving space to break a vacuum state in the safe valve body, such that a fluid contained in the safe valve body flows through the clearances between the elastic gasket and the safe valve body, and is drained outward from the connecting holes.

Abstract: An apparatus and method are provided for controlling the introduction of air into a burner. More particularly, the invention provides for a damper system that controls the introduction of air into a burner system by altering the size of a peripheral flow path for the introduction of air into the plenum of the burner.

Abstract: An expansion tank is disclosed in which a non-return valve is fitted in an outlet port of the expansion tank to limit backflow of coolant into the expansion tank in the event that the pressure in the expansion tank falls below the pressure in a return conduit thereby preventing the expansion tank from filling with coolant. The non-return valve and the expansion tank are formed as a single component and the non-return valve is located in an outlet port of the expansion tank.

Abstract: A two-way check/bypass valve is connected between the hot and cold water supply lines at hot and cold water faucets located most distantly from the water heater in a building. The valve establishes and maintains convective hot water circulation at a low flow rate from the heater to the most distant hot water faucet, through the cold water supply line, and back to the heater, during the period of time when the hot and cold water faucets are closed. When the hot water faucet is opened, hot water is nearly instantly available. Convective hot water circulation is stopped by the valve when either the hot or cold faucet is opened. The valve also prevents mixing of hot and cold water when either the hot or cold faucet is open and includes provision for dampening any water hammer effect.

Abstract: The fluid delivery system includes a pressurizing device for delivering a pressurized injection fluid, a low pressure fluid delivery system, and a pressure isolation mechanism adapted for fluid communication with the pressurizing device and low pressure fluid delivery system. The pressure isolation mechanism includes a housing defining an inlet port, an isolation port, and an internal cavity. The housing defines a seal seat in the internal cavity between the inlet port and isolation port. A valve member is disposed in the internal cavity. The valve member is free floating in the internal cavity and is adapted to engage the seal seat. The valve member has an open position permitting fluid communication between the inlet port and isolation port, and is fluid flow responsive to fluid flow in the inlet port to engage the seal seat and attain a closed position preventing fluid flow between the inlet port and isolation port.

Abstract: A variable device for regulating the outlet pressure of a fluid from a valve body, includes a pressure-sensing chamber having a wall formed by a resilient self-restoring diaphragm which is responsive to pressure in the chamber. A valve element connected to the diaphragm controls flow into the chamber. Increased pressure in the chamber decreases the flow into the chamber and decreasing pressure increases flow whereby fluid flow out from the chamber is maintained at a desired pressure. The outlet pressure is adjusted by deflecting the diaphragm in a direction to open the valve while permitting a section of the diaphragm connected to the valve member to remain responsive to the pressure in the chamber. An adjustment cover is provided to adjustably deflect the diaphragm and includes a catch mechanism to allow adjustment of the fluid outlet pressures and also retain the device at a desired value. An indicator arrangement may be provided to visually indicate the fluid outlet pressure.

Abstract: A valve mounted in a circular aperture in an approximately horizontal automobile body part, comprising a valve body fitted with means that shall be in-stalled in sealing manner in said aperture, further a valve element that in its closed position cooperates in sealing manner with the said valve body and that in its open position allows water draining from top to bottom, characterized in that the valve element is rotationally symmetrical and designed in a manner that it shall float up at a water pressure underneath it and be adjusted thereby into the closed position and in that the valve element comprises a conical segment resting in sealing manner against the edge facing it of the cross-sectionally circular passage of the valve body.

Abstract: An air turbine starter is provided that includes a check valve assembly. The check valve assembly comprises a valve body, a valve seat and a valve element. The valve body includes an inlet port, an outlet port, and a flow passage extending therebetween. The valve seat is coupled to the valve body, extends at least partially into the flow passage and has an opening therethrough. The valve element is disposed within the flow passage between the valve seat and the valve body outlet port. The valve element is also configured to translate axially between an open position and a closed position in response to a pressure differential between the inlet and outlet ports.

Abstract: A solenoid valve useful in a slip-controlled hydraulic brake system of a motor vehicle, and which has a seat valve disposed between a pressure fluid inlet and a pressure fluid outlet and in the bypass to this seat valve, has a check valve with a hollow conical valve seat and a closing body, which has a section that is embodied as complementary to the hollow conical valve seat. A rubber-elastic sealing ring is accommodated with the greater portion of its cross section in the circumference of the section and in the closed position of the check valve, this sealing ring can compensate for dimensional deviations of the valve seat at low pressures.

Abstract: An excess flow control valve which automatically shuts off when an excessive flow of liquid or gaseous material is detected. The valve uses a flow sensitive piston which is drawn up to cover the valve outlet when the flow exceeds a specified rate. When the piston is seated against the valve outlet, flow ceases, or is reduced dramatically, and the piston is held in place by the pressure of the supply. Additionally, ports are provided to activate a pressure differential device which can be used for remote monitoring and/or valve position, i.e., a red flag or switch, if desired.

Abstract: A valve member includes a first communication passage for allowing a first passage to communicate with a first pressure chamber. When a pressure-receiving member contacts the valve member, a communication between the first communication passage and the first pressure chamber is shut. Magnetic force of a permanent magnet urges a shaft toward the pressure-receiving member. While a coil is not energized, when pressure inside a second passage rises, the pressure-receiving member leaves the valve member due to pressure difference between pressure inside the first pressure chamber and pressure inside a second pressure chamber, so that the first passage communicates with the second passage through the first communication passage. When the coil is energized, magnetic repelling force is introduced between a stator core and the permanent magnet, so that the pressure-receiving member and the shaft depart from the valve member to allow the first passage to communicate with the second passage.

Abstract: The present invention is directed to a zero crack-pressure, high-flow valve assembly especially suited for use with blood salvage or recovery systems. The valve assembly cooperates with a valve seat defining an opening for selectively providing fluid communication between two adjacent chambers based on a pressure differential between the chambers. The valve assembly includes a disk coupled to a concentric ring support by a plurality of flexible or elastic arms, thereby permitting the disk to move relative to the ring support in a direction that is generally perpendicular to the plane of the ring support and the disk. The connecting arms also define fluid flow passages between the disk and ring support. The valve assembly is mounted so that the disk is normally spaced-apart from the valve seat, allowing fluid to flow between the two chambers. By increasing the relative pressure of the downstream chamber, the disk closes against the valve seat, blocking the opening.

Abstract: A gas line shut-off assembly which is automatically actuated in the event of a catastrophic break of a gas line, wherein gas is retained safely inside the remaining intact portion of the gas line. The gas line shut-off assembly is preferably composed of two mutually cooperating components, a breakaway and a shut-off. The breakaway has a weakened wall section. When connected to a gas line, the breakaway serves as a weakest location of the gas line so that should the gas pipe thereof be subjected to shear forces sufficient to break (ie., rupture) it, the gas line will break firstly at the breakaway. The shut-off is located upstream of the breakaway and is composed of a valve body and a perforated piston. The piston has a head and the valve body has seat, wherein the piston is movable in the valve body between a rest location and a seated location. At the seated location the piston head is sealably seated at the seat, thereby preventing gas flow through the valve body.

Abstract: A one-piece polymer plastic shut-off valve that includes a conduit with a first end having a sealing surface thereon and an engagement surface for connection to a fluid system and a plug with a further sealing surface that is yieldably supported in a spaced condition from the sealing surface of the conduit by elongatable supports to allow fluid to flow through said conduit under a first flow condition when the elongated supports are not extended and to prevent flow of fluid through said conduit under a second flow condition when the elongated supports are extended.

Abstract: A gas safety valve includes a main body having a longitudinal through hole that defines a gas passage. The longitudinal hole has an inlet end communicated with a gas source, an outlet end through which gas from the gas source exits, a first mediate section adjacent to the outlet end, and a second mediate section between the first mediate section and the inlet end. A spring is mounted in the first mediate section, and a ball is movably mounted in the second mediate section. The first mediate section has a diameter greater than that of the outlet end, while the second mediate section has a diameter greater than that of the first mediate section such that the ball is capable of partially protruded into the first mediate section to block the gas passage defined by the longitudinal through hole. When no gas leakage occurs, a pressure difference between two ends of the ball is relatively small and thus forces the ball to a position not blocking the gas passage.

Abstract: A check valve having an elongated body with bore therethrough, the bore having a small diameter section abutting a downstream frustoconical section with an increasing diameter, a ball positioned downstream of the small diameter section and movable in the frustoconical section and a pin blocking the bore to keep the ball at or near the frustoconical section and near to the small section, such that a reversal in fluid flow will seat the ball within the frustoconical section and block the bore.

Abstract: An improved one-way valve consisting of a valve body containing a valve chamber with at least two surfaces and having first and second fluid ports each communicating with a respective one of said surfaces, and a flat valve member loosely located within said valve chamber and movable by fluid forces within said chamber into and out of a position to block fluid flow from said valve chamber through said first fluid port.

Abstract: A valve is formed by an intersection of an open ended water supply pipe and a sprinkler outlet pipe. The outlet pipe has a closed end and an outlet end that is adapted for connection to a sprinkler. A cylindrical guide post connected to the closed end extends through the intersection to a proximal portion of the outlet end. A guide assembly is slidably disposed over the guide post. In response to an excessive flow of water through the outlet end, the guide assembly is drawn through the intersection to occlude the outlet end.

Abstract: A valve for permitting fluid flow in a first desired direction and preventing fluid flow in a reverse direction. The valve includes a valve body having a rigid wall defining inlet and outlet openings at opposite ends thereof and a main flow passageway between the inlet and outlet openings. Secured to the rigid wall, so as to receive fluid entering the passageway through the inlet opening, is a tubular valve member of elastomeric material having upstream and downstream ends in fluid communication with one another. The tubular valve member is normally open to fluid flow but is yieldingly collapsible in response to downstream pressure increases to prevent fluid from passing therethrough. A ring is secured about the tubular valve member and is dimensioned to prevent the passage of the downstream end through the inlet opening in the event of a downstream pressure increase. The drain control valve may be employed in conjunction with a novel manifold for irrigation purposes.

Abstract: A gas regulator with a double pressure adjusting function has a valve body closed with a lower valve lid with two round gas chambers formed in the valve body and the valve lid, each gas chamber having a gas pressure adjuster to adjust pressure of incoming gas. A pressure controller is combined in a gas exit hole of the valve body to block immediately the gas exit hole in case of abnormal gas pressure flowing through the gas exit hole, and a gauge is provided near a gas intake of the valve body to check pressure of gas flowing in the first gas chamber.

Abstract: A non-contact vane-type fluid-displacement machine includes a stator housing having an annular interior surface defining an interior bore and a rotor supported in an eccentric position in the interior bore of the stator housing relative to the annular interior surface thereof to undergo rotation relative to the stator housing about a central rotational axis. The rotor has at least one slot radially defined therein relative to the rotational axis. The machine also has at least one vane disposed in radial slot of the rotor. The vane is mounted to the rotor to undergo reciprocable movement in a radial direction relative to the rotational axis of the rotor such that an outer tip portion of the vane is maintained in a non-contacting substantially sealed relationship with the interior surface of the stator housing. Improved features of the machine relate to a suction flow check valve assembly for use in the inlet of the stator housing of the machine.

Abstract: A fuel control mechanism for a liquid fuel burner includes a fuel regulating valve which is responsive to flow of liquid fuel through a fuel feed tube for movement between a starting position and a running position. When a fuel control valve for the burner is opened, flow of liquid fuel through the fuel feed tube moves the fuel regulating valve to a starting position in which the fuel regulating valve restricts flow of fuel through a fuel inlet. Air is thereby drawn through an air inlet and mixes with the fuel. After the burner is started and liquid fuel is vaporized within the generator, flow of fuel through the fuel feed tube slows, and the fuel regulating valve falls by virtue of its weight to the running position in which the fuel regulating valve does not restrict flow of fuel through the fuel inlet. Air flow through the air inlet is thereby discontinued, and only liquid fuel flows through the fuel feed tube.

Abstract: A flow restricting device is described which includes a conduit with a flow inhibitor therein. A plug stem is placed inside a passage in the inhibitor such that it can slide axially, while the head of the plug, which has a larger cross-sectional area than the passage, remains outside the passage. When the fluid pressure upstream of the flow inhibitor is greater than the fluid pressure downstream thereof, the head of the plug is forced against the face of the inhibitor and flow is restricted. To facilitate resetting of the inhibitor, the head allows a small amount of flow to pass to the downstream side, thereby equalizing the pressure across the device.

Abstract: A retrievable subsurface safety valve positioned in a well conduit is actuated to close by a predetermined flow rate through the safety valve. A valve member having a sealing surface is moveable by flow to sealingly engage an annular seat in the valve, closing the valve to flow. All forms of the invention safety valve have retrievable variable weight assemblies which releasably lock in the valve member for varying the flow rate at which each valve closes. In two invention forms, the weight assemblies when retrieved from the valve members leave the valve members open for passage of well tools through the valve members. In one invention form, the valve housing has a variable bias for biasing the valve member toward open position and this safety valve may be operated to expend the seat, housing and valve member with or without the variable weight assembly.

Abstract: A portable sprayer which has a resealable closure, a dispensing valve and a pressure-responsive filling valve attached to a receptacle. As the receptacle is filled with fluid through the valve, air which is entrapped in the receptacle pressurizes the container to facilitate dispensing the fluid. During filling, the inlet valve closes if the pressure of the liquid source to which the sprayer is connected exceeds that within the container by a predetermined amount. The inlet valve also closes when the filling hose is disconnected from the container in order to close the container.

Abstract: A check valve for use in a vehicle engine fuel system comprising a fuel storage tank, a fuel feed line for delivering fuel from the tank to the engine, and a fuel return line for returning unused fuel from the engine to the tank. The valve is mounted on the return line in the fuel tank to be operable by a combination of flow-induced pressure reduction and fuel ram pressure to prevent reverse flow of the fuel through the return line in the event of reverse flow conditions.

Abstract: A check valve for an engine cooling system includes opposite ports and a venting plug press fit in one of the ports. The venting plug defines an opening which allows fluid flow through the valve, and a jiggle pin is positioned in the opening. The jiggle pin has a head on one side of the venting plug for sealing the opening, an anchor on the opposite side for retaining the jiggle pin in the opening and a neck connecting the head with the anchor. A bleed notch is defined in a periphery of the opening to permit restricted fluid flow past the venting plug, even when the head of the jiggle pin is sealed. The ends of the check valve have external threads and different diameters for securing the valve in different size opening, and the venting plug can be press fit into its port in either of two orientations so that either the anchor or the head is positioned between the venting plug and the end of the valve.

Abstract: A flow limit valve for limiting the flow rate of a pressurized fluid includes a valve body with an interconnecting cavity of circular cross section. Within the cavity is a piston that slides within the cavity under force generated by a pressure differential across the piston to a closed position in engagement with a seat at the end of the cavity. A first encapsulated magnet is carried within the valve body in a chamber located on the side of the seat opposite the cavity. The first encapsulated magnet can be moved in response to another magnet outside the valve body to move a pin which can extend through the seat when the piston is in a closed position to thereby move the piston to an open position. The magnetic forces applied through the valve body affect internal valve operation via the pin and thus avoids the dange of noxious fluids escaping through sliding seals or flexible membranes.

Abstract: A valve is provided primarily for medical or surgical aspiration equipment. The valve is interposed in an air line between the low pressure side of a pump and a collecting bottle for body fluid. The valve chamber has a sump-like bottom in which any liquid or froth entrained in air drawn in at a higher position will collect, and the valve member defines with said bottom narrow air admission apertures which are readily occluded by such liquid or froth, thereby producing a pressure difference across the valve member which displaces it to the valve-closed position.

Abstract: A urine-collecting container-valve assembly particularly intended for use when taking urine from the urinal bladder of a patient, particularly a bed-ridden patient. The assembly comprises a container, made of thin plastic material, having an inlet port which accommodates a non-return valve arrangement. The valve arrangement is housed in a valve housing having an inlet and an outlet. Arranged in the interior of the valve housing is a perforated plate-like element which extends transversely to the longitudinal axis of the valve housing in liquid-tight abutment with the walls of the housing. The housing also has arranged therein a pressure-activated buoyant body which is freely movable between the mutually opposing surfaces of the plate-like element and the bottom wall of the valve housing. The invention is characterized by means which co-act with the buoyant body in a manner to guide the body axially during its movement from one terminal position to another terminal position.

Abstract: The invention relates to a shuttle valve designed to retain fluid in a pressurized system when the cap or closure of the filler neck is damaged or left off. In a preferred application, the shuttle valve of the present invention is designed to be installed in the filler neck of an oil storage tank incorporated in a turbine engine of an airplane or other high speed vehicle. The valve head comprises a piston which is disposed to move slideably and is biased by gravity, or other means, to seat in normally closed position near the inner end of a cylindrical sleeve which is suspended coaxially from an annular flange in the mouth of the filler neck. The cylindrical sleeve has an axial length which substantially exceeds that of the piston, which in one embodiment is a hollow cylinder closed at one end.

Abstract: The riser is used for the substantially foamfree drawing of gaseous liquids, preferably liquids containing carbon dioxide, or gasfree liquids from gas-pressurized receptacles. The riser is equipped with an entry chamber, a downstream reduction chamber connected to it and a reduction pin movable in both chambers. Preferably a calming chamber of widened cross-section is formed in rising direction behind the reduction chamber. The riser enables gasfree and gaseous liquids, in particular beverages containing carbon dioxide, to be drawn from receptacles independently of the gas pressure inside them, substantially without causing the liquid to foam. The riser, in connection with a receptacle closure fitting, may with ease be changed from one receptacle to another.

Abstract: The present invention concerns a way and a means for rendering equal the effect of gravity independent of the mode of installation in flow regulators for gaseous substances, particularly for air in air-conditioning and ventilation installations, and for maintaining the volumetric flow of the gaseous substance at desired magnitude with sufficient accuracy when the differential pressure acting across the flow regulator varies within given limits. The flow regulator comprises an envelope and a regulating member turnably disposed in the flow passage confined by the envelope. The torque produced by the flow of gaseous substance on the regulating member and on the other hand a countertorque dependent on the position of the regulating member cause the regulating member turning in the flow passage to assume a position of equilibrium such that the requisite pressure drop is obtained for maintaining the volumetric flow rate at predetermined magnitude. The regulating member is first balanced, e.g.

Abstract: The invention concerns a flow regulator, intended for gaseous substances, in particular for air in air-conditioning and ventilation installations, for maintaining the volumetric flow of the gaseous substance at desired magnitude with sufficient accuracy when the differential pressure acting across the flow regulator varies within desired limits. The flow regulator comprises an envelope and a regulating member disposed in the flow passage confined by the envelope. The flow regulator is provided with limiter members for limiting the differential pressure range of the flow regulator, said limiter members being disposed to restrict the movement of the regulating member. The limiters are adjustable and/or self-adjusting. The flow regulator has a scale for setting the limiter members.

Abstract: A throttling unit (1) is joined with a pressure detector by a regulating device for controlling the discharge of a fluid from a container. The regulating device has a throttling unit (3) that is designed to pivot on an axis in a manner permitting regulated closure across the diameter of the run-of opening (2'). The throttling unit is joined in a manner permitting operative movement with a pressure detector (9), which, in dependence upon water pressure, governs the movement of the throttling unit in the closure diameter of the run-off opening. The regulating device is set in a throttling chamber (21), which details on one side an output control area (10) open to the atmosphere and a run-off area (2). Because of the compactness of structure of the throttling unit and the pressure detector, the space required for the regulating device is extremely small.

Abstract: Sudden increases in fluid pressure which could be injurious to the diaphragm and seals of a sensitive capacitive pressure transducer, or the like, are instantly protectively blocked or "checked" automatically by a miniature naturally-powered valve having a low-mass one-piece valve member or plug molded of elastomeric material which is shaped and disposed to be immediately propelled into guided tight line-contact seating and sealing as an abrupt pressure surge commences and then to hold such sealing only until the plug is unseated by gravity when either the pressure is rapidly lowered suitably in operation of the transducer or the diaphragm is slowly exposed to increased pressure after enough minute normal valve leakage takes place.

Abstract: The present invention concerns a flow regulator for gaseous substances, particularly a flow regulator intended for air in air-conditioning and ventilation installations, for maintaining the volumetric flow of the gaseous substance at desired magnitude with sufficient accuracy when the differential pressure acting across the flow regulator varies within given limits. The flow regulator comprises an envelope and a regulating member turnably disposed in the flow passage confined by the envelope. The torque produced by the flow of gaseous substance on the regulating member and on the other hand a countertorque dependent on the position of the regulating member cause the regulating member turning in the flow passage to assume a position of equilibrium such that the requisite pressure drop is obtained for maintaining the volumetric flow rate at predetermined magnitude. The regulating member is substantially slightly curved at least in the flow surface facing the incoming flow of the gaseous substance.

Abstract: The present invention concerns a flow regulator for gaseous substances, particularly a flow regulator intended for air in air-conditioning and ventilation installations, for maintaining the volumetric flow of the gaseous substance at desired magnitude with sufficient accuracy when the differential pressure acting across the flow regulator varies within given limits. The flow regulator comprises an envelope and a regulating member turnably disposed in the flow passage confined by the envelope (11). The torque produced by the flow of gaseous substance on the regulating member and on the other hand a counter-torque dependent on the position of the regulating member cause the regulating member turning in the flow passage to assume a position of equilibrium such that the requisite pressure drop is obtained for maintaining the volumetric flow rate at predetermined magnitude.

Abstract: A flow limit valve for limiting the flow rate of a pressurized fluid includes a valve body with an interconnecting cavity of circular cross section. Within the cavity if a piston that slides within the cavity under force generated by a pressure differential across the piston to a closed position which prevents fluid flow through the valve. A pin is provided that is attached to the piston and that protrudes through the piston seat into the outlet side of the cavity when the piston is at the closed position. Opposite the pin is an encapsulated magnet within the valve body that can be moved in response to another magnet outside the valve body to contact the pin attached to the piston to move it to the open position. The magnetic forces applied through the valve body affect internal valve operation via the pin attached to the piston and this avoids the danger of noxious fluids escaping through sliding seals or flexible membranes.

Abstract: A safety flow control device for use in a beverage distribution system of the character using pressurized gas to dispense the beverage from its containers for ensuring that the containers are not accidentally overpressurized. The device of the invention is adapted to be placed in the line which connects the pressure source to the containers for the beverage. The device embodies a rupture disc having a first side exposed to the gas used in pressurizing the containers and a second side exposed to atmosphere. Strategically positioned between the pressure inlet of the device and the pressure side of the rupture disc is a valving mechanism which is maintained in an open configuration by the rupture disc. In the open configuration the valving mechanism permits the gas to flow from the inlet into a first sub-chamber defined by the first side of the rupture disc and then outwardly through the outlet of the device.

Abstract: A check valve includes an elongated housing having an inlet port at the upper end and an outlet port at a lower end and a float movable therein. An exterior valve seat surrounds the outlet and a valve stem connected to the float extends through the outlet port and has a valve element on the outer end which cooperates with the valve seat.

Abstract: A backflow check valve includes male and female hubs sonically welded together with a flow control disc located within the check valve. The disc permits flow in one direction through the check valve, but prevents flow in the other direction through the check valve.

Abstract: A bell trap and check valve is disclosed. The bell trap has a central tubular member around its outlet and a conventional cover. The check valve is removably attached to the central tubular member and supported thereon.

Abstract: A check valve for connection between a source of pressure medium and a pressure medium reservoir to allow passage of pressure medium from the source to the reservoir but to prevent reverse flow from the reservoir to the source.In order reliably to prevent reverse flow through the valve when the back pressure on the valve is low, the check valve comprises first (31,32) and second (46,50)individual pressure responsive valves in series in a common housing (10), both valves permitting forward flow of pressure medium but, in conditions of zero forward flow, one (46,50) of said valves being firmly closed in response to high back pressures from the reservoir and the other valve (31,32) being firmly closed at low back pressures from the reservoir.

Abstract: A valve having a closure element in the form of a tapered plug normally maintained by gravity on a vertical rod extending loosely into a bore in the plug. Flow of fluid through the valve in excess of a predetermined rate acts on a flow-responsive surface of the plug to move the latter into engagement with a valve seat, thus blocking further flow. The construction is particularly suited to close control of the flow rate at which closure of the valve occurs. The size, shape, weight and position of various elements influences the magnitude of the flow rate required for closure and may be tailored to effect closure repeatedly at a virtually exact desired flow rate. One embodiment includes means for selectively changing the shape of the flow-responsive surface, and thereby the flow rate at which closure occurs.