Abstract: A vapour compression system, in which the pressure and flow rate of refrigerant in components of the system to control and to optimize use of heat-transfer surfaces and to minimize power consumption, comprises a compressor 1, a condenser 5, a two-section evaporator 15, and a needle float valve 13 for maintaining a pressure differential between the condenser and the evaporator. The two section evaporator comprises a first section 17 which receives refrigerant from the condenser and which partially evaporates it to discharge two-phase refrigerant into a reservoir 23 in which liquid refrigerant is collected and from which low pressure refrigerant vapour is supplied to the compressor, and a second section 19 which receives liquid refrigerant from the reservoir and evaporates it at least partially.

Abstract: A valve, particularly useful in a fire extinguisher, includes a valve housing having a through bore. A valve stem is disposed within the bore and is axially moveable between a first position, a second position, and a third position. The valve stem includes a seal adjacent to the second axial end for sealing with the first section of the bore. A cap is disposed within the second section of the bore and is axially moveable between a first position and a second position. The cap includes a seal for sealing with the bore when the cap is in the first position. The cap seal is impermeable to solids and permeable to gas when the cap is in the first position.

Abstract: A fuel delivery system for internal combustion engines that includes a fuel pump module adapted to be disposed within a fuel tank, with a pump inlet disposed at a lower portion of the tank for drawing fuel therefrom and a pump outlet for delivering fuel under pressure to the engine. An air/vapor purge valve is operatively coupled to the pump outlet. The purge valve is constructed to be open when air and/or vapor is pumped by the fuel pump to purge such air and/or vapor to the surrounding tank, and to be responsive to presence of liquid fuel under pressure at the pump outlet to close the purge valve and prevent passage of liquid fuel therethrough to the surrounding tank.

Abstract: A pressure equalizing membrane made of gas permeable, water impermeable polytetrafluoroethlyene is preassembled to a retaining ring and the ring retained within a housing wall with a watertight seal. Either a one or two part retaining ring is used as a holder for the PTFE membrane. The retaining ring is provided with at least one circumferential elastic sealing lip about its periphery for providing a press fit of the membrane and retaining ring assembly into the housing wall opening, and for providing a watertight seal about the membrane.

Abstract: An improved blister vent for relieving pressure within a blister on a multi-layered roof, wherein the shaft extending downwardly therefrom is provided with laterally extending threads, the pitch of which approximates the thickness of each of the layers of the roofing material.

Abstract: A nozzle for injecting a viscous fluid, such as a molten plastic and a non-viscous fluid, such as a gas, includes a nozzle body having an inlet end, a discharge end and a flow passage for viscous fluid extending from the inlet end to the discharge end. A shut off valve device is provided for reciprocating in the nozzle body flow passage to control the flow of viscous fluid through the nozzle body discharge end. The shut off valve device includes a valve body and a non-viscous fluid flow passage provided in the valve body. A baffle device is located in the non-viscous fluid flow passage of the shut off valve for retarding a flow of viscous fluid in the non-viscous flow passage.

Abstract: An air breather plug assembly adapted for use in a transmission or trans-axle casing includes a cylindrical plug body detachably threaded into an upper portion of the casing and having an inner end portion which extends into an interior of the casing in a predetermined length, a cup-shaped baffle-plate fixedly coupled within the inner end portion of the plug body and being formed with a slot for permitting the flow of air passing therethrough, a cup-shaped seal member of elastic material fixedly coupled within an outer end portion of the plug body and spaced from the baffle-plate in a predetermined distance, the seal member being formed with a slit to be opened by an internal pressure applied thereto from the interior of the casing through the baffle-plate, and a cap fixedly coupled over the outer end portion of the plug body in such a manner as to allow the air flowing from the interior of the plug body to the exterior through the slit of the seal member.

Abstract: A valve is disclosed for venting and relieving pressure within a blister in built-up, multiple layer roof structure, which includes a hollow shaft having one open end adapted to be inserted into the blister and the other end covered by an air permeable, water impermeable membrane protected by a housing. The exterior of the shaft is threaded to permit penetration into the blister and holding of the valve. Air is vented through the membrane and out a passage provided in the housing.

Abstract: Apparatus for selectively blocking passage of lipids in a liquid flow path. A baffle interposed in the liquid flow path is of nonpolar material and is arranged to permit liquid flow therethrough with contact of said liquid with the nonpolar material of the baffle for removing lipids from the flow. In one embodiment, the baffle is interposed between a wound drain connection and vacuum connection in a drain reservoir and protects a hydrophobic filter which is at the end of a vacuum passage communicating with the interior of the drain reservoir. The baffle enables use of a nonpolar material for the hydrophobic filter and avoids coating and thereby clogging of the hydrophobic filter by lipids in the liquid drained from a wound.

Abstract: A degasifying valve for storage and/or transport containers especially for the storage and/or transportation of dangerous liquids has a base provided with a degasifying orifice which on the downstream side of this base is surrounded by at least one annular rib. Biased towards that rib or those ribs respectively, is a diaphragm-like spring element covering at least the area enclosed by the rib or the ribs, respectively.

Abstract: The automatic purger has an intermediate chamber (11) one of the walls of which is formed by an elastic diaphragm (10), termed front diaphragm, whereas the other wall is formed by a second elastic diaphragm (12), termed rear diaphragm. This chamber is connected to a purger (20) formed by a body (21) defining a small internal enclosure (22) in which an element (25), which is highly permeable to the gas, is disposed. The invention is applicable to a hydraulically controlled or actuated pump of the reciprocating or displacement type.

Abstract: Valve body or stopper 1, for screwing into a liquid-filled system, is divided by a partition 2 into an inner chamber 6 accommodating a valve ball 8 loaded by a spring 7 into a valve opening 3 in the partition 2, and outer chamber 9 through the wall of which are a plurality of vent openings 10. Closure plug 13 screws into the chamber 9 and has a stem 12 on which are stopper rings 14 which swell upon taking up moisture and which register with the vent openings 10 so as to close the latter if liquid penetrates the valve opening 3. To enable the system to be bled manually as desired, a spindle 17 extends axially through the stem 12 to protrude by one end from the plug 13. At the other end the spindle 17 carries a pusher portion 19 by which the ball 8 can be unseated, this pusher portion 19 having, at its end facing away from the ball 8, a closure surface which serves, when the ball 8 is not being lifted, to seal the facing end of the channel, in the stem 12, through which the spindle 17 extends.

Abstract: A solenoid-operated pump for discharging fluid from a tank through a fluid discharge passage in a pump body has a directional control valve disposed in the fluid discharge passage. The directional control valve is normally urged to direct fluid flow through a fluid drainage passage branched from the fluid discharge passage and adapted for connection to the tank. The fluid drainage passage includes a restrictor which produces a fluid-pressure build-up in response to a change in viscosity of the fluid flowing therethrough, that is, when air is no longer contained in the fluid. The directional control valve is responsive to such pressure build-up to direct the fluid to flow through the fluid discharge passage.

Abstract: A diaphragm actuated-rod operated valve assembly adapted for installation in a fluid flow is disclosed comprising a one-piece elastomeric valve-spring-seal member which is operated by the push rod and has only a static seal and in addition is provided with internal support such as to prevent an otherwise collapsible portion of the valve from grabbing the operating rod as a result of external pressure and thereby inhibiting valve operation.

Abstract: A nonspill vented closure assembly is provided for a wet cell type of storage battery which normally provides a venting hole to the interior of the battery, and which includes a tiltable weight that lifts a valve to close the vent hole whenever the battery is tilted with respect to the vertical beyond a certain angular displacement, so as to prevent leakage of the liquid electrolyte through the closure assembly. The closure assembly includes a tubular casing which is threaded into the normal fill hole of the battery. A lead weight which constitutes the tiltable mass is supported in the casing. A valve stem connects the lead weight to a valve member, and it serves to move the valve member against an annular valve seat surrounding an orifice in the lower end of the casing whenever the lead weight is tilted. The valve stem includes a ball at its upper end which extends into a cavity in the bottom of the lead weight, and which is held in the cavity by a plastic disc which forms a bearing surface for the ball.

Abstract: An elastic squeeze bottle which springs back to shape after collapse by squeezing, contains a viscous product and has a normally closed valve opened by the displaced product and which automatically closes again when the squeezing is terminated. So that air can enter the bottle to replace the displaced product, the valve has a permanently open package proportioned so that the air can be sucked into the bottle, but the passage being too small to permit the viscous product to gravitationally leak from the bottle through the passage.

Abstract: A blood sampling assembly is provided which has a cannula designed for intravenous penetration, a mechanism for applying negative pressure to the cannula, a chamber located between the cannula and the source of negative pressure, a one-way valve positioned within the chamber, and a venting member within the chamber which allows the venting of air as blood enters the chamber, but does not allow the passage of blood. A person drawing blood is enabled to visually determine when a needle is properly inside a vein through transparent walls of the chamber. Spillage of blood is avoided with the present assembly by the resistance of the one-way valve to flow distally from the intravenous cannula.

Abstract: The present invention relates to a device for introducing a liquid other than blood in a blood vessel, composed of a hollow needle having a front end and an axially opposite rear end, a hollow female support base which is fixed to the rear end of the needle or which is connected to the rear end thereof by a supple, transparent tube, and of a membrane which is disposed transversely with respect to said support base, which membrane is at the same time permeable to air, impermeable to blood and permeable to the liquid to be injected.

Abstract: A twin check valve pumping system for use with a syringe or other variable volume pumping device for the pumping of liquids. Along a flow path between the check valves, a porous, hydrophobic member is positioned, in communication with a portion of the flow path upstream of the first, inlet check valve. The second, downstream outlet check valve is biased so that pressure in the conduit between the check valves is required for expulsion of liquid. When gas enters the system, such pressure cannot be achieved, because, upon attempted pressurization of the area between the two check valves, the gas passes through the porous, hydrophobic member back to a position upstream of the first, inlet valve. However, aqueous liquids cannot pass through the porous member, and accordingly the device pumps such liquids normally in the absence of gas.

Abstract: The present invention provides an apparatus for phase separating a gas-liquid mixture as might exist in a sub-critical cryogenic helium vessel for cooling a superconducting magnet at low gravity such as in planetary orbit, permitting conservation of the liquid and extended service life of the superconducting magnet.

Abstract: A safety valve which may be used in a pipette or in medical or biological equipment such as collection bottles, employs a carrier which is inserted in a flow line and contains a material which swells in the presence of an unwanted fluid to block the line and provide protection against contamination.

Abstract: A source of hydraulic fluid is connected with a user by a hydraulic circuit in which a pump is interposed so as to supply the hydraulic fluid under pressure to the user. A housing is interposed in the circuit, having a bore communicating with the circuit. An air venting passage communicates with the bore and a valve body is located in the bore upstream of the passage and defines a throttling gap through which air in the circuit can pass into and out of the passage, but at which subsequent flow of hydraulic fluid will create sufficient pressure to displace the valve body to a position in which it seals the air venting passage.

Abstract: A process is disclosed for preparing a silver halide emulsion comprised of serially receiving a silver halide emulsion at an upstream location, supplying the silver halide emulsion in a further prepared form at a downstream location, and transporting the silver halide emulsion between the upstream and downstream locations while it is being further prepared. The silver halide emulsion is divided into discrete segments as it is received at the upstream location. The discrete segments of the silver halide emulsion are transported between the upstream and downstream locations in the sequence of their formation. The emulsion can be finished as it is transported to the downstream location. The silver halide grains can be shelled during transport. In still another application a converted-halide emulsion can be formed during transport to the downstream location.