Abstract: In a ventilating valve adapted to be connected to a pipe in which, when the pressure in said pipe is below the ambient pressure, said pressure is equalized by causing ambient air to enter said pipe, said valve comprising an annular valve means, the pressure in a valve chamber communicating with the pipe acting on one side of said valve means while ambient pressure acts on the other side thereof through an inlet opening to the valve chamber, said inlet opening being defined by stays which extend between two seats co-operating with the valve means, there is arranged around the inner wall of the housing of said chamber a liquid collecting groove which is connected by means of one or more channels with the interior of a tubular connecting means for the pipe, and each such channel is arranged in a stay.

Abstract: A combination vacuum relief valve and pressure relief valve assembly includes a top cover plate which is movable vertically to vent a predetermined pressure in the tank above atmospheric. The top cover plate is resiliently mounted with springs which resiliently bias the cover into the closed position to determine the pressure at which the top cover plate moves to vent pressure in the tank. The vacuum relief valve is located below the top cover plate. First passageways provide fluid communication between the outside atmosphere and the lower surface of the vacuum relief valve. Second passageways provide fluid communication between the top surface of the vacuum relief valve, the bottom surface of the top cover plate and the interior of the tank.

Abstract: A vacuum pump is connected through a vacuum line to the milking apparatus, and a pressure regulator is employed to admit into the line the amount of ambient air necessary to maintain line pressure constant within narrow limits. The pressure regulator comprises a rolling-sleeve air valve to control the admission of ambient air, and which is itself controlled by a bias spring and an opposed diaphragm. One side of the diaphragm is subjected to pressure generally equal to line pressure, whereas the other side is subjected to the pressure of air within a dome. Means are provided to admit into the dome sufficient air to maintain dome pressure constant. Means are also provided to bleed air through the diaphragm, thus maintaining substantially constant the pressure drop thereacross. The air valve is constructed with a deflecting skirt which prevents false sensing of line pressure.

Abstract: A venting valve for a cargo hose includes a cover plate attachable to the hose, the plate having an opening which receives a coupling to a check valve. The check valve prevents escape of fuel but admits air to permit fuel to drain from the hose into an attached storage tank, preventing spillage when the hose is subsequently detached therefrom and handled.

Abstract: An automatic vacuum relief valve assembly includes a cover plate closing an opening in a container to the atmosphere. A valve is vertically spaced below the cover plate and closes communication between the inside of the container and the outside atmosphere. A first passageway provides fluid communication between a first surface of the valve and the outside atmosphere. A second passageway provides fluid communication between the inside of the container and a second surface of the valve. When the pressure inside the container becomes less than atmospheric pressure, atmospheric pressure will cause the valve to move away from its seat and allow air to enter the container. When the pressure is equalized, the valve is biased to return to the seated position.

Abstract: A vacuum breaker for use on a moving tank for allowing atmospheric air to enter the tank to relieve a reduced pressure condition in the tank. The vacuum breaker has a light-weight closure assembly including a closure member of relatively large area. The closure assembly is normally held closed by permanent magnets. The magnets and the light-weight construction of the closure assembly substantially prevent the vacuum breaker from opening due to vibration of the moving tank. However, the vacuum breaker opens readily in response to a relatively slight reduced pressure in the tank because of the large area of the closure member. The permanent magnets are shielded from undesirable proximity of ferrous objects to prevent the magnets from being drained. The vacuum breaker may be opened manually to test for a positive pressure condition in the tank.

Abstract: A shielded vent port for equilization of the pressure on opposed faces of a wall comprises a frame for fitting into an opening in said wall, a conduit through said frame, a sloping plate in said conduit, said plate being sealed against the walls of said conduit and having a large aperture therethrough, and a riser lying against the upper face of said sloping plate, said riser preventing flow of air in a downward direction through said plate and being movable away from said plate to permit flow therethrough in an upward direction. To provide for flow of air through said wall in either direction, the frame may have two conduits therethrough with a sloping plate and a fitted riser in each, the planes of said plates sloping in opposed directions. The shield may be lifted away from the plate to permit flow of air therethrough by an excess of pressure below the plate or by a solenoid in response to an external signal.

Abstract: A device designed to effect automatic activation or deactivation of electrically, hydraulically or pneumatically operated control means, comprising a body freely movable in an air-tight housing and in its normal position sealing an aperture, a spring-biased control member arranged in a conduit one end of which is connected to the chamber and the opposite end of which is closed by said control member, which member may be displaced in said conduit between an activating and a deactivating position, said displacement effected by the pressure differential or the pressure blance in said conduit on the opposite side of said control member arising as a consequence of said body being forced from its aperture-sealing position upon tilting of the housing past a predetermined angle or upon acceleration or retardation of a certain magnitude of said housing.

Abstract: A pressure or vacuum relieving device intended as a large capacity inbreathing or outbreathing apparatus for equipment and/or piping, operating under low to moderate gas pressure or vacuum, e.g. 1 to 15 psig pressure or 0-5 psi vacuum. The principal feature is that a required set pressure is provided hydrostatically by means of a liquid leg acting an a bellows expansion joint. The device is suitable for use in Pulp Mill Digester Blow Steam Systems and similar applications.

Abstract: The invention relates to an automatic air valve device for sanitation waste pipes for preventing communication in the rooms between the waste pipes and atmosphere and to permit the introduction of fresh air into the pipes when a negative pressure occurs.It comprises a body formed by a vertical tube in communication with a waste pipe, the said body having at its upper part a constriction in the form of a Venturi cooperating with a cover so as to form a peripheral air inlet situated at the exterior of the constriction.The said air inlet is provided with an annular valve.Around the cover and the upper end of the cylindrical body there is an insulating covering in which there is formed a circular recess providing communication with the atmosphere (FIG. 1).

Abstract: An air cleaner for use on internal combustion engines is provided with a bellows valve which is located on the clean side of the filter and blocks the outlet to the carburetor when the engine is not operating to prevent fuel vapor escape and is aspirated by a source of vacuum during engine operation to retract to an open position permitting free filtered air flow to the carburetor.

Abstract: A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal member, and cooperative retaining members mounted on the frame and closure member and resiliently urging the closure member into sealing engagement with the seal member, yielding to allow the closure member to displace toward the duct to allow air flow thereby for vacuum relief and returning into sealing engagement with the seal member said retaining members being releasable for removal of said closure member.

Abstract: A safety interface for connection between an anesthesia patient circuit and a disposal system, and a combined positive and negative pressure relief valve for the safety interface.The safety interface comprises a housing defining a passageway, means for connecting an upstream end of the passageway to the waste anesthetic gas outlet of an anesthesia patient circuit, means for connecting the downstream end of the passageway to a disposal system, a negative pressure relief valve and a positive pressure relief valve in communication with the passageway. The positive pressure release valve and negative pressure release valve are preferably provided in the form of a combined positive and negative pressure release valve, and a second negative pressure release valve is preferably also provided. Preferably, a restrictor partially obstructs the passageway at a point on its upstream to downstream extent, and the positive pressure relief valve communicates with the passageway at a point downstream of the restrictor.

Abstract: This disclosure pertains to a gas scavenger apparatus utilized to recover anesthesia-logical gases derived during surgical procedures and to dispose same to a closed vacuum line substantially limiting the inadvertant escapage into the atmosphere. A reservoir bag is connected to the patient's anesthetic circuit, which in turn is connected to a scavenger valve. The vacuum line constantly empties the reservoir bag drawing off the waste gas accumulated therein. When the reservoir bag is substantially empty, a valve admits ambient air, as well as waste gas, into a chamber emptied by the vacuum line. Thus, the vacuum line does not act on the patient's anesthetic circuit, serving only to empty the reservoir bag as waste gas accumulates therein.

Abstract: A control valve of an exhaust recirculation apparatus comprises an expansible vacuum chamber communicating with a venturi portion and having a first diaphragm and a spring urging the diaphragm to expand the chamber, an expansible exhaust pressure chamber having a second diaphragm disposed to oppose the first diaphragm at a distance and communicating with an exhaust inflow chamber, a control chamber disposed between the above chambers and defined by the first and second diaphragms and a frame mounting the first and second diaphragms thereon. The first and second diaphragms are connected by a bracket to which a seal member is secured through a block. In the control chamber is disposed a conduit one end of which has an opening facing the seal member with a gap therebetween, the other end communicates with a throttle portion and an exhaust gas recirculation valve provided in an exhaust recirculation passage.

Abstract: The purpose of the invention is to provide a pilot-valve-controlled safety valve for venting excess pressures without allowing any noxious gas to exhaust to atmosphere in the vicinity of personnel.This purpose is achieved by the provision of a safety valve and pilot valve combination with a connection from the pilot valve to an exhaust duct of the main safety valve. Control of the exhaust rate from the pilot valve is effected by the provision of a divergent nozzle at the downstream end of the pipe leading from the pilot valve.The invention is of particular value when applied to a storage vessel for natural gas or a natural gas pipeline.

Abstract: A closure for food containers embodying an open-ended resilient tubular elastomeric nipple adapted for connection to a source of vacuum so that air within the container may be evacuated prior to storage of the container and its contents. The nipple is provided with an inner frusto-conical wall of small slant angle which constitutes a valve seat. A spherical ball loosely disposed within the nipple is forcefully drawn against the seat incident to differential air pressure on opposite sides of the ball. Unseating of the ball to equalize the air pressure inside and outside the container is accomplished by pinching the nipple immediately below the ball. An obstruction near the upper rim of the nipple prevents escape of the ball during evacuation of the container or during handling of the closure.

Abstract: A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal member, and removable retaining members mounted on the frame and resiliently urging the closure member into sealing engagement with the seal member, yielding to allow the closure member to displace toward the duct to allow air flow thereby for vacuum relief and returning into sealing engagement with the seal member.

Abstract: A valve for controlling the pressure within a tank to prevent excessive above or below atmospheric pressure conditions, including a pressure responsive valve and a vacuum responsive valve, wherein each valve includes a pallet with seals and blowdown rings of polytetrafluorethylene material, which is commercially marketed under the trademark Teflon. The pressure pallet includes guide means having Teflon parts, while the vacuum responsive valve includes hinge means having coacting Teflon parts. The breather valve includes structure defining a vertically extending vent structure having an opening arranged alongside the tank in which the valve is mounted, which opening is positioned to avoid being sealed by any normal buildup of ice and snow.

Abstract: A valve body having a bore formed therethrough defining an air inlet at one end and including a diametrically enlarged counterbore at the other end. The outer end of the counterbore is closed by means of a removable end wall having a small diameter opening formed therethrough and a piston is slidable in the counterbore and includes a shank portion coaxial therewith longitudinally reciprocal in the bore. A compression spring is disposed between the end wall and the piston and yieldingly biases the latter toward a position seated in the inner end of the counterbore. The valve body includes a lateral outlet bore or passage whose inner end opens into the first-mentioned bore intermediate the opposite ends thereof and the outer end of the lateral bore has one arm of a tubular T-fitting secured therein, the other two arms of the tubular T-fitting being adapted to be interposed in a positive crankcase ventilating hose.

Abstract: Damage due to implosions occurring within the furnace chambers of balance draft vapor generators is prevented by the provision in the downstream combustion gas duct of one or more openings that are closed during normal operation by doors which are automatically released upon the occurrence of an inordinately high negative fluid pressure atmosphere in the furnace. The doors, when released, operate to obstruct the flow of combustion gas out of the furnace chamber and thereby, in association with operation of the forced draft fan, overcome the excessive negative pressure in the furnace chamber. Also, the exposure of the induced draft fan to outside air upon release of the door prevents the fan from producing an inordinate negative pressure adjacent the door that would otherwise tend to close the door and also detrimentally affect the furnace pressure.