Abstract: A vacuum breaker valve assembly is provided including a housing mountable to a transport tank. The housing has a wall defining a passageway through the housing and there is a valve member movable within the housing. Structure is provided for permitting the valve member to move in response to variations in tank pressure between (1) and open state when atmospheric air external of the tank is allowed to travel through the passageway and into the tank once a predetermined vacuum pressure condition is reached, and (2) a closed state wherein the passageway is sealed to prevent atmospheric air travel into the tank when the predetermined vacuum pressure condition in the tank has not been reached. A housing lid is mounted to the housing and includes a vent hole for allowing atmospheric air to enter the housing passageway. A bottom wall integral with the housing wall includes a vent hole therethrough communicating with the interior of the tank.

Abstract: A vacuum breaker valve configured for clean in place capability is provided which includes a body having an internal passageway including a chamber, a valve member shiftable within the chamber, and a motive member positioned adjacent an upper end of the chamber for selectively displacing the valve member. The valve member closes the upper end of the chamber under backpressure to inhibit undesired discharge of the fluid in the chamber, while the motive member, such as a selectively shiftable plunger, serves to periodically displace the valve member away from the valve seat at the upper end of the chamber whereby fluid, such as a cleaning solution, may pass through the valve body and internally clean the vacuum breaker valve without the need for disassembly.

Abstract: A bottle cap with an air removing device consists of a cap unit and an air stopper combined together. The cap unit includes an upper cap portion, a lower cylindrical portion and a valve formed in an interior of both the upper cap portion and the lower cylindrical portion and having a capsule-shaped cavity for a stopper of the air stopper to fit and move up and down therein to stop an air hole in a bottom of the valve so that the air in a bottle fitted with this cap may be pumped out by an extra air pump fitted in an open cavity of the upper cap portion. After the air in the bottle is pumped out, then the air stopper is pushed down by the air pump again, keeping the cap firmly fixed on the mouth of the bottle in an almost vacuum condition, wherein the food therein may not deteriorate for a long time.

Abstract: A valve assembly for automatic venting of excess suction or pressure in a fluid conduit such as a sewage drain line. An elastomeric diaphragm is drawn by a stressed stem against a valve plate having a passageway therethrough which is normally closed by the diaphragm. A predetermined differential pressure across the diaphragm will lift the diaphragm away from the plate to open the passageway.

Abstract: In a shut-off or diverter valve, an anti-cavitation valve located downstream of the shut-off or diverter valve member vents an outlet passageway to the atmosphere to minimize cavitation in an outflowing column of water which has suddenly been isolated from the inlet. The anti-cavitation valve may be located in the interior of the shut-off or diverter valve member. When the pressure gradient between atmospheric pressure and the pressure in the just closed outlet passageway exceeds the force exerted by a spring, the anti-cavitation valve opens an air passageway communicating between the atmosphere and the outlet passageway. Part of the air passageway may be in the interior of the push rod of the diverter valve member.

Abstract: A vacuum valve for use in a tanker is constructed with means (11, 12, 13, 33, 35, 36) for applying a supplemental closing force to the valve body if the pressure drop across the vacuum valve rises substantially above a value designated for the vacuum valve. Such an extraordinary rise of the pressure drop will occur by escapage from an injury under the waterline caused by grounding, and the supplemental closing force will therefore close the valve very fast and will thereby contribute to maintaining a high vacuum in the tank, counteracting continued escape.

Abstract: This invention concerns a relief valve for use in a swimming pool cleaner hose and has a body with an outlet for connection into the nose. A tubular inlet to the body carries a spider supporting a clamping flange which secures the outer periphery of a resilient annular diaphragm to the end of the body. The diaphragm has its inner periphery in frictional engagement with the inlet. The inlet may be mounted for axial movement against a resilient bias to engage the diaphragm only while a predetermined minimum flow passes through the valve.

Abstract: A suction pressure regulating valve automatically maintains the suction pressure of a swimming pool cleaning system to be consistent with the optimum range of water suction pressure when the valve is used with suction type automatic swimming pool cleaners. The valve is a water immersed device which permits water to bleed through an orifice, which orifice opens in proportion to suction pressure within the valve. The valve has a conical body which readily adapts in line with the flexible hose that connects the swimming pool filter system with the suction type automatic swimming pool cleaner. This type of pool cleaner moves about the sides and the bottom of a swimming pool, continuously cleaning those surfaces. The valve orifice is protected from air incursion by an anti-vortex plate when the valve is near the surface of the pool.

Abstract: An apparatus for metering an accurate flow of a first fluid, at a low pressure and a low flow rate, into a conduit conducting a flow of a second fluid, at a much higher pressure and much greater flow rate, comprises a pressure reducer containing a nozzle and a peristaltic pump connected in fluid communication with the pressure reducer. The pressure reducer is connected in the conduit and the nozzle of the pressure reducer increases the flow rate of the second fluid flowing through the pressure reducer, thereby correspondingly reducing the pressure of the second fluid in the pressure reducer. The peristaltic pump supplies the first fluid to an area of the bore through the pressure reducer where the nozzle has decreased the pressure of the second fluid channeled through the pressure reducer. A pressure relief valve communicates with the pressure reducer to prevent the pressure of the second fluid from decreasing below a third fluid pressure.

Abstract: A by-pass valve is affixed to the housing of a self-propelled submersible swimming pool cleaner. The pool cleaner includes a head having a suction chamber in which a propulsion mechanism is located for operation by water flow into the suction chamber. The head incorporates a by-pass inlet to the suction chamber downstream from the propulsion mechanism. A leaf spring biases the closure member over the by-pass inlet. The tension of the spring is overcome by the suction in the suction chamber when water flow into the chamber is blocked. Water flow is thus allowed into the suction chamber via the by-pass inlet. By placing the spring controlled by-pass inlet into the system flow stream between the cleaner propulsion mechanism and the system weir in the typical pool system, there is a small probability of the by-pass becoming blocked.

Abstract: A fuel cap is provided to improve sealing characteristics of a pressurized fuel tank. When the inner pressure P of a fuel tank is a negative pressure less than a predetermined regulation negative pressure Pr which does not need to be controlled, a valve 160 is pressed upward by the urging force of a spring 164 to bring a lip portion 161 of the valve 160 into contact with a seal surface 156 of a seal body 150 to thereby close the valve 160. As a result, the fuel tank is sealed from the outside air. At this time, a flat plate portion 155 of the rubber-made seal body 150 is bent by the urging force of the spring 164 so that the gap L between the flat plate portion 155 and the lower surface of a ceiling plate portion 131 is narrowed. In addition, the divergence of center of the valve 160 with respect to the seal body 50 is limited by ribs 162 of the valve 160 located in a valve slide hole 135.

Abstract: An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movement within, or as otherwise introduced to system of pipe or duct while further remaining tightly closed at normal atmospheric pressure (equilibrium) and equalizing pressure excursions that are below atmospheric pressure occurring within sanitary drainage pipes or room ventilation ducts by admitting air to said pipe or duct.

Abstract: A faucet assembly has a housing formed with a vent passage extending between inlet and vent ports and a feed passage extending between an outlet port and a location in the vent passage between the inlet and vent ports. An inner valve body is displaceable in the vent passage between an inner end position sitting in an inner valve seat at the inlet port and blocking flow out of the vent passage through the inlet port and an outer end position sitting in an outer seat and blocking flow from the location toward the vent port. Similarly an outer valve body is displaceable in the vent passage between an outer end position sitting in a vent seat at the vent port and blocking flow out of the vent passage through the vent port and an inner end position permitting flow through the vent port.

Abstract: A vacuum valve for use in a tanker is constructed with means for releasing a supplemental force on the valve body if the pressure drop across the vacuum valve rises substantially above a value designated for the vacuum valve. Such an extraordinary rise of the pressure drop will occur by escape from an injury under the water-line caused by grounding, and the supplemental closing froce will therefore close the valve very fast and will thereby contribute to maintaing a high vacuum in the tank, counteracting continued escape.

Abstract: A self-adjusting damper device is provided for installation into an air-conveying duct to prevent the development of damaging low pressure within the duct. The device utilizes a panel adapted to occlude an aperture in the duct. Springs hold the panel in a position which normally occludes the aperture. The panel travels toward the interior of the duct in response to low pressure within the duct. The extent of travel of the panel is limited by a retaining member.

Abstract: A check valve for use in the evacuation of air from a system having primary and secondary disc retained in a chamber of the housing and responsive to first and second forces developed by the creation of a fluid pressure differential between the fluid pressure of air in a first member and a source of vacuum to control the evacuation of air from the member by the source of vacuum. The primary disc is located on a stem that extends from the secondary disc to cover a plurality of openings which connect the inlet port to the chamber. A spring holds the secondary disc against the housing. The first force which develops as a result of a pressure differential between the fluid pressure of air and vacuum moves the primary disc to allow air to be evacuated through the openings in the secondary disc. Should the fluid pressure in the air located in the first member exceed a predetermined value, the second force develops which acts on the secondary disc to allow a larger volume of air to be evacuated in a shorter time.

Abstract: A swimming pool cleaner relief valve comprising a body; a flow passage through the body having an inlet and an outlet for connection to a pipe having an induced flow therethrough; a bypass passage through the body connected to the flow passage and open to ambient conditions at a free end and having parallel ridges on its inner surface and a restriction at the free end; a flexible resilient diaphragm that slides coaxially within the bypass passage having a peripheral flange and a perforation permitting flow therethrough in only one direction and variable in size depending upon the degree of flexing of the diaphragm, and cooperating members movable in the parallel ridges to prevent complete withdrawal of the diaphragm from the bypass passage; and a collar having a ring with a recess that receives the flange and having serrated projections that engage the restriction.

Abstract: A one way air admittance valve (2) for admitting air into a pipe (3), which valve (2) comprises a body portion (4) for fitting to the pipe (3), at least one air inlet port (6) in the body portion (4), and rigid sealing means (16) which is longitudinally movable between a first position in which it seals the air inlet port (6) and a second position in which the air inlet port (6) is open for the admittance of air into the pipe (3), the valve (2) being such that there is only one sealing means (16) for all of the air inlet ports (6), and the sealing means (16) being such that it seals at two separate areas by engaging with a pair of lip seals (18,20) which are mounted on the body portion (4) and which are radially spaced apart by being positioned inwardly and outwardly of of the air inlet port (6).

Abstract: A regulator (20) for an ink-jet pen (24) that has a print head (30) for expelling ink from a fluid volume includes a seat (36) mounted to a pen body (26) and having a port (42) formed through it. A valve element (38) is mounted adjacent to the seat for movement relative to the port (42). Magnetic attraction is employed for urging the seat (36) and valve element (38) together to thereby close the port (42) and permit underpressure to develop in the reservoir (22). The valve element (38) and seat (36) are configured and arranged so that when the underpressure within the reservoir (22) rises above the level that may cause failure of the ink-jet print head (30) the valve element (38) moves away from the seat (36) to permit air to enter the reservoir (22), thereby reducing the underpressure to an operable level.

Abstract: This invention relates to a relief valve used where there is an induced flow through equipment. The relief valve controls the flow through the equipment at a uniform rate and also provides for pressure relief of the liquid used in the equipment. The valve comprising a body having a flow passage therethrough with an inlet and an outlet for connection into a pipe having induced flow therethrough. A bypass passage from the body between the inlet and the outlet and open to ambient conditions at the free end is also provided. There is a flexible resilient diaphragm in the bypass passage perforated to permit flow therethrough in one direction only and the perforation variable in size dependant on the degree of flexing of the diaphragm.

Abstract: A food pasteurization system includes a vacuum breaker valve having a valve element in an axial passageway normally maintained in a closed, raised position by a coil spring on the top side of the valve. Multi-purpose drain and air openings are provided in the valve body and are positioned below the upper end of the valve passageway such that material moving upwardly through the valve is automatically drained out of the valve rather than back into the food conduit.

Abstract: An automatic air valve for a conduit, through which passes fluids and/or solids, which valve prevents the discharge of contaminated air therefrom into the environment and which further permits the introduction of fresh air from the environment into the conduit when a negative pressure develops therein. The valves may be disposed at either the terminus of or interposed within the conduit flow line of a duct system. The valves include an interior filter that restrains foreign objects, such as insects and snakes, in the duct systems from operatively interfering with the proper operation of the valve.

Abstract: An automatic air valve for a conduit, through which passes fluids and/or solids, which valve utilizes a freely-movable valve member to prevent the discharge of contaminated air therefrom into the environment and to permit the introduction of fresh air from the environment into the conduit when a negative pressure develops therein. The air valves may be disposed at either the terminus of or interposed within the conduit flow line of a duct system. The air valves include an interior filter that restrains foreign objects, such as insects and snakes, in the duct system from operatively interfering with the freely-movable valve member. Means is also included for preventing the interior filter to move or to be moved into a position wherein the interior filter may operatively interfere with the freely-movable valve member. The interior filters are nonplanar in shape, so as to provide a total air passage area that is substantially the same as the air passage area that is present without the interior filter.

Abstract: A plumbing arrangement is described for a toilet pan connected to a waste disposal pipe. The waste pipe has an extension extending a short height above the flood level of the water trap. The upper end of the extension is closed off by a two way differential valve opening to the atmosphere. A cover is provided to permit the air flow to and from the valve but still to prevent the ingress of leaves or dirt which could have a detrimental effect upon the working of the valve. A number of embodiments of valve means are also described.

Abstract: Resilient accommodation of vacuum brake booster check valves to vacuum source-generated pressure pulses tending to cause the valves to pulse open and close is accomplished by providing a resilient annular area in the check valve radially between its axial center and the area where it sealingly engages a valve seat when closed to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: There is disclosed a vacuum assembly including a manifold housing having one port in fluid communication via a conduit with the suction side of a pump and wherein a user site is in fluid flow via a conduit with another port or the manifold housing and wherein a vacuum relief valve assembly is positioned within the manifold housing and includes a valve disc of a spring loaded valve disc assembly in line contact with a bevelled valve seat of a valve body of the vacuum relief valve assembly thereby defining a valve seat of line contact wherein the area downstream of the valve seat is greater than the area at the valve seat.

Abstract: A seal for a fitting adapter for fluid couplings wherein a coupling probe is received within a recess within the other coupling half and the seal prevents the creation of subatmospheric pressures during withdrawal of the probe. The seal includes a lip or flapper valve component which establishes sealing during coupling pressurization, and permits atmospheric pressure to flow around the lip during coupling disconnection.

Abstract: A value opening air flow control ring requires the poppet to travel a controlled distance off the poppet seat to obtain substantially unrestricted air flow, the restricted flow occurring during air flow pulsations which acts to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source. The control ring also causes directional air flow past the poppet, particularly in the early part of the valve opening sequence while the restricted flow is occurring, causing a side bias on the poppet which decreases as the poppet moves toward its fully open position, the side bias being substantially eliminated by the time the poppet reaches its fully open position. The side bias action is reversed in the valve closing movement from the fully open position. The side bias further inhibits valve pulsations which might otherwise occur as the valve tends to move from the closed position to the open position and vice versa in response to vacuum source air flow pulsations.

Abstract: An air admittance valve for use in drainage systems comprising a housing with an opening therein through which air passes into the drainage system, and a pivoted closure member adapted to close the opening and openable on a pressure difference between the system and the exterior.

Abstract: A high flow vacuum check valve incorporates a plurality of rubber dampening feet located on the sealing bead side of the valve poppet. The feet extend axially slightly beyond the sealing surface of the sealing bead so as to have an axial compression interference, the feet first engaging the valve seat as the valve poppet moves from its open position toward its closed position, and then compressing as the valve poppet continues its movement until the valve is fully closed with the sealing bead in full sealing engagement with the valve seat. This interference compression causes the feet to perform as rate changing springs so long as they are compressed to any extent, dampening axial movements of the valve poppet, and also act as stabilizing members on the valve poppet in the lateral plane. The feet may also be constructed with tiers which also contribute to the stability of the valve poppet.

Abstract: An improved flow-limiting fluid refill valve for use with a fluid-actuated pump having a fluid chamber comprises a valve housing, fluid inlet means in communication with a source of hydraulic fluid and fluid outlet means in fluid communication with the fluid chamber of the pump. A first valve within the valve housing is provided between the fluid inlet means and the fluid outlet means for permitting a flow of fluid from the fluid source to the fluid chamber when the suction pressure within the fluid chamber exceeds the first predetermined pressure limit indicating that the fluid within the fluid chamber has been depleted below a predetermined fluid limit. The improvement comprises a second valve within the valve housing for preventing the flow of fluid from the fluid source to the fluid chamber when the suction pressure within the fluid chamber exceeds a second predetermined pressure limit greater than the first predetermined pressure limit and indicating abnormal operation of the pump.

Abstract: Resilient side loading of vacuum brake booster check valves by an O-ring type resilient spring to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: Resilient side loading of vacuum brake booster check valves to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source achieved by a single spring member functioning as a valve closing spring and as a lateral biasing spring acting on the valve.

Abstract: Resilient side loading of vacuum brake booster check valves by lightly loaded coil springs acting directly on said valve member to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: Resilient side loading of vacuum brake booster check valves by U-shaped spring clips engaging the valve stems to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: A fluid T-coupling comprising a through fluid flow path, and an intersecting vent path, wherein the vent path is integrally molded within the filtered bayonet connector to be used with an aspirator to control the level of vacuum communicated to an irrigation/aspiration handpiece during eye surgery.

Abstract: A valve to prevent gastric reflux or leakage through the vent lumen of a double-lumened nasogastric tube. The valve allows the passage of air into the vent lumen when atmospheric pressure exceeds stomach pressure. When stomach pressure exceeds atmospheric pressure the valve prevents flow of fluids through the tube.

Abstract: Resilient side loading of vacuum brake booster check valves to inhibit valve pulsations and resulting valve noises generated by pulsations from the vacuum source.

Abstract: A marine riser anticollapse valve is disclosed for preventing a marine riser from collapsing under external sea water pressure in the event of a sudden loss of internal drilling fluid pressure. An external valve structure is provided for each of a plurality of openings in the wall of a riser pup joint. Each of the valve structures includes a cylinder having an opening in communication with a body wall opening. A piston in each cylinder is subject to sea water pressure but is prevented from opening when riser bore pressure of a sufficient magnitude is applied internally to the piston via the pup joint opening and cylinder opening. When the riser bore pressure falls, the piston is driven to an open position allowing sea water to enter the riser.

Abstract: A vacuum valve-sensor device mounted on a vacuum source and maintaining the vacuum generated by the vacuum source to a required level. It includes a one-way valve which allows gas to flow towards the vacuum source but not away therefrom, and a pressure sensor on the side of the one-way valve remote from the vacuum source. The one-way valve includes a valve seat through which flow of gas is directed and a valve element biased toward seating on the valve seat from the side of the vacuum source. The pressure sensor may be located on the side of the valve seat remote from the valve element thereof, and may include a V-ring seal member fitted on the valve element.

Abstract: A preloaded check valve disposed in a valve body between an ink reservoir and a printhead has a valve opening pressure or "cracking" pressure at least sufficient to overcome the hydrostatic pressure due to gravity of ink in the reservoir. This prevents depriming or leakage of ink at the orifices of the orifice plate forming part of the ink ejecting mechanism. Ejection of ink during printing creates a pressure differential across the valve sufficient to cause it to open and replenish the ink supply at the ink ejecting mechanism.

Abstract: A vacuum check valve member has a lip arrangement, which provides one sealing portion, and an inner reinforced second sealing portion, the valve member, and particularly the valve lip, acting to tend to pull itself closed with minimal flow across valve member in the valve closing direction. The inner sealing portion bottoms out at high differential pressures and is reinforced by a rigid valve body so that the valve member does not rely on the lip alone for full closure. The lip is flexible throughout the normal operating temperature range likely to be encountered, and upon opening when any ice crystals are formed thereon will flex and break up such ice crystals as the valve member is opening, preventing the valve member from sticking under extremely cold weather conditions. The valve operates without having a valve spring continually urging the valve member toward engagement with the valve seat.

Abstract: A vacuum check valve assembly having an axially guided poppet valve and a minimal restriction to air flow. The poppet valve has a seal made of a fluoro-silicone rubber which has excellent non-sticking and non-leaking characteristics over a wide temperature range. The valve assembly may be combined with a fuel vapor adsorbent canister.

Abstract: A pressure relief port for relieving the pressure within an enclosure having a wall with first and second sides and a first opening therethrough. The pressure relief port includes a tube having a conduit therethrough sized to fit in the first opening in the wall to extend essentially intermediate the first and second sides of the wall. First and second end caps having respective openings therein are sized to fit on the first and second walls respectively, about the first opening. The tube extends into the first and second end caps. A flexible diaphragm extends substantially across the conduit in the tube for regulating air flow and is displaceable between a first position where the diaphragm substantially closes off the conduit to air flow and a second position where the diaphragm is displaced by air pressure to permit air to flow through the conduit to equalize pressure on opposite sides of the wall.

Abstract: An air admittance valve, particularly for use on a stack pipe of a toilet or drainage system, to close the pipe when there is at least atmospheric pressure in the pipe, but to open to admit atmospheric air to the pipe upon the occurrence of even a very small less-than-atmospheric pressure in the stack pipe. The valve has a hollow body (1,2) with a lower opening to the stack pipe, and an internal wall defining a chamber and a valve seat about an upward opening, and a lateral opening to the exterior. A valve member (3) in the body above the chamber opens and closes the upward opening, and the valve member is guided in alignment with the valve seat.

Abstract: A venting device for sanitary conduits comprising a first edge 12 and a second edge 10 bounding an air passage 7. One side of a valve 8 of flexible material is retained on the upper side of first edge 12, the other side provided with a downwardly extending ledge 13 moveably engages the top 15 of second edge 10. The valve 8 is provided with a thinned portion 9 near the first edge 12.

Abstract: The device includes a tubular body, an annular flap cooperating with the tubular body, and a cover cooperating with the tubular body to form a channel or peripheral air inlet beneath the annular flap, which channel is closed by the latter. When a partial vacuum occurs in the conduit connected to the device, the annular flap is raised by the incoming ambient air upwardly and into the internal space defined by the inner periphery of the cover. The annular flap is provided with external guiding lugs oriented downwardly and which cooperate with ribs integrally formed on the outside of the tubular body.

Abstract: A relief valve for sanitation systems, said relief valve incorporating a valve seat 11, 25, within a valve chamber 5, 22, and a freely flexible valve element 12, provided for engagement with the valve seat 11, 25 to prevent inflow of air to the valve chamber 5, 22 through an air inlet 10, 26. Guide means 16, 17 are provided for assisting the valve element 12 into sealing engagement with the valve seat 11.

Abstract: An overpressure safety valve assembly for use during heart surgery is disclosed. The assembly comprises an elongated tubular body portion having an inlet end, and an outlet end and an unidirectional valve disposed therebetween. A relief valve portion is joined to and in flow communication with the tubular portion. The relief valve portion includes a first relief valve configured to open if the pressure within the overpressure safety valve diminishes below a predetermined level, and a second relief valve configured to open if the pressure adjacent the outlet end exceeds a predetermined level.

Abstract: An emergency air intake valve has a circular plate having a top and bottom and depending central portion adapted to be connected to a conduit. The plate and the depending portion have a vertical bore therethrough. A diaphragm overlies the top of the plate and has a central opening aligned with the bore. The diaphragm has an enlarged depending peripheral portion adjacent the diaphragm opening and adapted to contact the top of the plate adjacent said bore. A cap secures the outer edge of the diaphragm adjacent the outer edge of the plate and forms with the diaphragm a chamber above the diaphragm. The plate has at least one opening therethrough to provide communication between the bottom of the diaphragm and the atmosphere.