Abstract: An air valve for the demand or second stage of a scuba regulator disposed between the intermediate pressure region and the low or breathing pressure region which includes, a stationary valve seat and a tubular, movable valve element whose sealing edge is sealingly biased against the valve seat. The interior of the tubular element is in communication with the low pressure chamber and the forward portion of the exterior of the tubular element is in communication with the intermediate pressure chamber. And a flexible sealing means forming a wall between the low and the intermediate pressure regions and supporting the valve element for limited movement between a closed and an open position.

Abstract: An improved regulator intended primarily for use as the essential component of a SCUBA system and being a single hose, two stage regulator incorporating a novel valve subassembly in the second stage in the form of a unique main diaphragm valve and a pilot valve assembly.

Abstract: The venturi action in a demand regulator is controlled by moving a baffle across an air inlet into the regulator chamber as the inlet valve is opened.

Abstract: This invention relates to breathing apparatus specially suited to submerged use, of the kind comprising a two-stage pressure reducer whose first stage is connected to the outlet valve of the diving cylinder and is responsible for the reduction from high pressure to medium pressure, while the second stage is associated directly with the mouthpiece and supplied it with air for respiration in response to each inhalatory suction from the user which exceeds a minimum threshold value termed the lifting suction.According to the invention, the first stage includes structure for adjusting the medium pressure, which has a member for direct manual operation which is mounted to be easily accessible and which can be operated by the user even when diving, so that the medium pressure can be adjusted whenever the lifting suction becomes too great, or whenever the effect of changes in the operation of the first stage is to alter it, or before diving in shallows.

Abstract: A backflow prevention device is disclosed which includes a pressure differential relief valve. The relief valve includes a lift chamber functioning to accelerate opening of the valve to assure that the valve fully opens once it has partially opened. The relief valve also includes construction features which allow control of the opening timing of the valve and which cause added closing force to be applied on the valve member to provide more positive closure thereof. Furthermore, a member is provided which substantially eliminates transfer of torque from a spring in the relief valve to a diaphragm therein and substantially eliminates angular cocking of the moveable valve assembly also in the relief valve.

Abstract: A demand regulator for use in underwater breathing employs a deflector carried by a valve operating lever for movement between the air outlet in the breathing chamber and the mouthpiece tube to reduce the portion of air supplied directly to the mouthpiece as the air flow is increased.

Abstract: For use with a variable displacement piston pump of the type including a hydrostatic bearing for transmitting a thrust load for affecting the pump output, a valve responsive to pump discharge manifold pressure for controlling the pressure in the pump chamber, and including means for insuring that the full thrust load will be taken by the hydrostatic bearing at discharge pressures less than a predetermined pressure.

Abstract: Pressure responsive piston valve with spring controlled detent balls; a detent pressure spring extends longitudinally through the piston and urges a biasing ball against detent balls which are longitudinally offset from the biasing ball; the detent balls are driven into a detent groove in the cylinder for the piston; pressure on the piston forces the detent balls out of the detent groove; calibrating means for the spring.

Abstract: A respirator valve for respirators with a pressure-responsive control of the breathing pulses of a patient, comprises, a valve housing which has a pressure chamber therein with a connecting breathing line to the patient. First and second control diaphragms close respective sides of the pressure chamber and are flexible in response to pressure variations in the pressure chamber. A connecting member disposed between the diaphragms is moved by the flexing of the diaphragms so as to operate a lever mechanism for shifting a valve member to open or close a valve seat in a connecting line to a pressurized breathing gas for supplying the breathing gas into the pressure chamber and into the patient in accordance with variations in the patient's efforts to inhale and to cause pressure variations in the pressure chamber to actuate the diaphragms.

Abstract: An automatic brake release valve in the form of a normally open pressure relief venting structure for air operated vehicular brakes and the like, wherein atmospheric air is vented into the closed brake system intermediate the air brake actuating valves and the brake chambers actuated thereby. This venting valve structure relieves any pressure build-up which occurs as a result of brake valve leakage, since any increase in pressure in this part of the system closes the exhaust valves and actuates the brakes. So that normal brake function is maintained, the venting valve structure closes on a predetermined pressure rise. Thus, when the brakes of the vehicle are applied, a limited amount of air will escape from the system, until the predetermined valve closing pressure is reached, and during this air escape period, water condensate is exhausted from the system automatically, while providing maximum brake efficiency.

Abstract: An imperforate clip is slidable on the air inlet housing in a diving regulator for movement over one of a plurality of valve outlet ports to adjust the ratio of the air flow into the breathing chamber to the air flow directly into the mouthpiece.

Abstract: A demand regulator for use in underwater breathing employs a deflector carried by a valve operating lever for movement between the air outlet in the breathing chamber and the mouthpiece tube to reduce the portion of air supplied directly to the mouthpiece as the air flow is increased.

Abstract: A nozzle to be inserted in the opening of a nursing bottle or similar container and which allows drinking by sucking but prevents leaking when the bottle is left in any position.

Abstract: In a refrigeration cycle of an air conditioning system of the type, in which lubricating oil for lubricating a compressor circulates through the refrigeration cycle together with refrigerant, an evaporation pressure control device is provided between an evaporator and the compressor for not only controlling the amount of refrigerant circulating through the refrigeration cycle in response to the pressure of the refrigerant out of the evaporator, but permitting the refrigerant to return to the compressor when the pressure of the refrigerant out of the evaporator is extremely decreased owing to the leakage of the refrigerant, whereby seizure of the compressor can be prevented.

Abstract: A translating piston, fluid pressure valve which utilizes a convoluted, elastomeric diaphragm member both to seal a high pressure area and to selectively control exhaust of pressurized fluid therefrom upon movement of the piston of the valve.

Abstract: A pressure relief valve for hydraulic mine supporting elements, particularly mine props, has a valve member loaded in its closing direction by a spring, a piston is connected to the valve member end sealingly sliding within a cylinder of the valve housing and arranged to be acted upon in closing direction by the pressure prevailing within the space before the seat of the valve member. The valve member has a neck portion of reduced diameter between the valve seat and the piston and the annular cross section, being acted upon in closing direction, between the neck portion and the circumference of the piston is smaller than the annular cross section, being acted upon in opening direction, between the neck portion and the valve seat.

Abstract: A relief or other valve with a soft seal for sealing at high pressures. The seal is independently movable and at least partially pressure balanced for protection against seal damage and deformation. A hard seat is provided for engagement by a hard valve wherein a lost motion connection is provided between the seal and hard valve.

Abstract: The servo valve disclosed herein is rendered essentially insensitive to changes in pressure across the valving element by providing spring biasing of the valving element which is controlled by a diaphragm exposed to the inlet and outlet pressures. In a particular embodiment, the diaphragm is spring biased and the spring rates for the diaphragm and the valve element are selected in such proportion that the change in biasing force on the valve element exactly compensates for any change in inlet pressure. Therefore, the valve remains closed for any inlet pressure, unless the bias on the spring rates is unbalanced by a signal coming from a sensor.

Abstract: Pressure medium regulating device in which a fluid cell is positioned between the inlet and outlet of the device. The inlet is connected to a source of pressure medium and the outlet to a motor or other apparatus fed and operated by the regulating device. Flow through the regulator is reduced or increased in accordance with demand by the fluid cell which responds to line pressure of the pressure medium.

Abstract: The invention contemplates an improved flow switch providing an electrical output which is indicative of whether or not a predetermined flow or no-flow condition exists in an hydraulic line. In all its disclosed embodiments, the invention features simplicity of construction and a minimum of impedance to hydraulic flow, by reason of a straight-through flow alignment between inlet and outlet ports.

Abstract: The invention relates to a cut-off valve assembly for an oil burner assembly. The cut-off valve is of the type which is spring biased and rapidly opens and closes above and below a predetermined pump pressure. The rapid closing is to prevent fuel oil from dripping from the nozzle. The valve assembly has an expansible chamber formed with a diaphragm. The chamber has inlet and outlet ports with a valve seat formed on the outlet port. A spring biased adjustment element has a disk shaped portion below the diaphragm which carries a closure member for the outlet port. The face of the closure member is displaceable relative to the disk shaped portion and is of a larger diameter than the diameter of the valve seat for the outlet port.

Abstract: A nozzle shut-off valve for an injection molding machine has a plunger mounted to reciprocate in a bore so as to block the passageway of the plastic through the nozzle, a single-acting pneumatic piston and cylinder to reciprocate the plunger, to block said passageway, and a pilot passage connecting the underside of the plunger to a location upstream of the intersection of the bore and the passageway for plastic through the nozzle.

Abstract: A valve assembly of the type, wherein a first end of a movable plunger is adapted to collapse or compress a first tube length against an opposite tube backing or support structure in order to regulate or vary the flow conditions of a fluid in this first tube length, is equipped with a control assembly comprising a second interiorly pressurized tube length and a second or opposite end of the plunger engages this second tube length. Thus, by appropriately proportioning the sizes of the contact faces between the respective plunger ends and the tube length associated therewith it will be possible to control the flow conditions in one of the tube lengths responsive to the fluid pressure in the other tube length whereby various valve or regulating functions may be performed by the valve. The two tube lengths may be parts of one and the same tube whereby additional valve or regulating functions may be performed.

Abstract: A hydraulic control device for use with an automatic speed change gear device for a diesel engine using a torque convertor and an auxiliary speed change gear device. This hydraulic control device is provided with a back pressure control valve controlled by means of a throttle pressure developed in response to a throttle opening, wherein when the throttle opening is smaller than a given opening, a pressure oil having a pressure lower than a line pressure is introduced to an accumulator, and when the throttle opening is greater than the aforesaid given opening, a pressure oil having the same pressure level as that of said line pressure is fed to said accumulator to thereby obtain a desired engaging pressure for said automatic speed change gear device, thus effectively preventing a shock due to a change in speed. This device may also be used with a gasoline engine.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A device for regulating the flow in a breathing gas apparatus includes a baffle in a housing which is pivotable toward and away from an interior cylindrical wall in order to vary the quantity of air which is directed through a passage defined between the baffle and the wall and into a slot forming an inhalation discharge port which leads to the user of a respiratory device. The baffle may be shifted in the housing by an adjustment means, in the form of a threaded member, to regulate the amount of breathing gas which is directed from the inlet port directly to the slot forming the inhalation discharge port, and the amount which is circulated around the housing when the baffle is moved away from the wall for indirect flow to the uncovered portion of the inhalation discharge slot.

Abstract: A pressure regulator for divers' breathing apparatus having a diaphragm case and a diaphragm disposed therein. As a function of the pressure which exists in a space delimited by the diaphragm and which is varied by the diver's breathing, the diaphragm controls, via a control member, a valve having a fixed portion and a movable portion. A pressure chamber is provided in which a reduction in pressure is produced through a channel opening out into the flow of gaseous mixture into the valve at right angles to the direction of that flow. The opening of the valve is assisted and accelerated by this reduction in pressure in order to facilitate the diver's breathing.

Abstract: The invention contemplates sound-absorbent structure so built into the downstream side of a flow-control valve as to absorb noise generated by fluid passage through the valve, without presenting obstruction to the flow controlled by the valve.

Abstract: In a scuba or other breathing apparatus, the demand regulator includes a diaphragm connected by a linkage to a valve that supplies breathable gas to the user in response to inhalation demand, as sensed by the diaphragm. The linkage includes a diaphragm-connected lever situated between a ball restrained for axial movement and a fixed member having a spherical surface facing the ball. The lever pivots on the spherical surface to cause sensitive displacement of the ball and hence actuation of the valve.

Abstract: A pressure relief valve which will move to a fully open position as soon as a predetermined pressure is established within a vessel in which the valve is mounted. The valve comprises a housing mountable in the vessel with its inner end opening inwardly of the vessel and its outer end opening outwardly of the vessel. A pressure relief passage opens through the housing and a valve member is slidably mounted with respect to the housing for movement between a first position closing the pressure relief passage and a second position in which the pressure relief passage is open to permit full flow through the pressure relief passage. Locking means is provided for releasably interlocking the valve member and the housing to retain the valve member in its first position.

Abstract: An inflator assembly including a flow control device associated with a safety system for controlling flow of fluid from a fluid source into an inflatable restraint, such as an inflatable confinement associated with a vehicle for protecting an occupant during a collision. The flow control device includes a shiftable valve which is normally responsive to fluid flow initially actuated by an explosive. The shiftable valve contains or orifice which is progressively opened during the opening movement of the valve to provide for controlled flow of fluid into the restraint.

Abstract: An automotive fuel system which has a fuel tank, a fuel pump, a fuel metering device for metering fuel flow to an associated fuel-consuming engine, and a fuel reservoir (such as, for example, a carburetor fuel bowl), has a valving assembly interposed generally between the outlet of the fuel pump and the fuel reservoir with such assembly being responsive to, for example, the associated vehicle experiencing a crash impact or a roll-over condition whereupon such valving assembly becomes effective to prevent the further flow of fuel from the fuel pump into the fuel reservoir.

Abstract: An air flow regulator is provided which may be utilized in diving or scuba equipment. A diaphragm urges a pivoted leg assembly into pivoted motion and the latter, being coupled to a valving means, provides controlled passage of air to the user. A sloped, rolling contact is provided between the pivoted leg portion and a stationary mounting means therefor so that a variably positioned pivot point is provided along the longitudinal length of the leg portion as it experiences various degrees of pivoted movement whereby the leg portion provides correspondingly various degrees of mechanical advantage for moving the valve means of the assembly. The various mechanical advantages correspond to the various degrees of effort required for different selected valve openings so that the same amount of user effort is necessitated for all positions of valve opening.

Abstract: A demand type governor for gaseous fuel internal combustion engines, various kinds of breathing and heating apparatus and similar applications features a diaphragm controlled inlet valve having two different rates of opening movement for a given rate of movement of the diaphragm producing a relatively small amount of valve movement in relation to diaphragm movement for instances of lower demands and a relatively larger amount of valve movement in relation to diaphragm movement for instances of higher demands, all by means of a lever-fulcrum arrangement having a higher mechanical advantage in the first instances and a lower mechanical advantage in the second instances. Other features of the governor help assure its uniform, relatively frictionless operation, and its ease and economy of manufacture.

Abstract: A fuel filter bypass valve assembly includes a valve body having inlet and opposite sides. A movable member is peripherally sealed to the opposite side, and moves toward and away therefrom to define a variable volume chamber. Port means extends past the valve body for establishing communication between such chamber and the valve body inlet side. Yieldable biasing means is connected with the movable member for normally biasing same toward the valve body opposite side and biasing the entire assembly in a direction for positioning the inlet side against a valve seat. Cooperating stop means between the movable member and valve body limits movement of such movable member away from the valve body opposite side. The movable member and valve body are proportioned so that the pressure required to move the movable member away from the valve body against the force of the biasing means is substantially less than the pressure required to move the valve body away from the valve seat against the force of the biasing means.

Abstract: A shut-off valve for the automotive fuel system is operable to shut off the fuel flow whenever a positive pressure exists in the fuel line between the fuel tank and the shut-off valve. The shut-off valve may be employed in combination with a fuel pump or may be employed separately in the fuel line and comprises a flexible diaphragm connected by a stem directly to the valve member and movable with the valve member. The diaphragm air chamber has an air vent controlled by a vent valve providing a relatively large opening for bleeding in air and providing a relatively small opening for exhausting air from the diaphragm air chamber. The vent valve thus permits a relatively fast movement of the valve member to an open position and a relatively slow or restricted movement of the valve member toward a closed or partially closed position.

Abstract: Breathing gas from a remote source is supplied directly to a diver's helmet, without the requirement of a demand valve. Exhaust gas is returned back to the remote source through a series arrangement of a normally open fail-safe valve and an exhaust control valve which maintains the helmet pressure within predetermined limits relative to the ambient water pressure. Should the exhaust control valve fail in the open position, the fail-safe valve will actuate to insure that the helmet pressure does not decrease to a dangerous level. Valve actuation is a function of diver orientation so as to maintain helmet pressure within a range to minimize diver breathing effort, for the various positional orientations.The helmet includes ducting for the exhaust gas and the valves are constructed and arranged to sense the helmet pressure directly for comparison with the ambient water pressure acting on the respective valves.

Abstract: A motor vehicle air brake system which includes a blend back proportioning valve which reduces brake sensitivity at low braking pressures and which allows full braking at high braking pressures. The proportioning valve includes a shuttle piston, a blend back sleeve, and a one-piece outlet diaphragm. The outlet diaphragm seals a reference chamber from outlet pressure and permits movement of the shuttle piston and blend back sleeve together as well as movement of the shuttle piston and blend back sleeve relative to one another. The proportioning valve also includes a one-piece inlet diaphragm which seals the reference chamber from inlet pressure and which provides a valving surface to open and close communication between the inlet and the outlet of the valve. In a second and third embodiment of the proportioning valve, springs are added to alter the proportioning characteristics of the valve.

Abstract: An inflation valve comprising an inlet; an inlet valve seat; an inlet valve member having an input face, part of which is engageable with the inlet valve seat, and an output face; a restricted passageway from a first space on the input face side of the inlet valve member to a second space on the output face side of the inlet valve member; an outlet valve seat; an outlet valve member having a first face engageable with the outlet valve seat and capable of being exposed directly or indirectly to pressure in the first or said second space and a second face exposed to exhaust pressure; and a mechanical connection between the two valve members; the mechanical connection and the relationship between the surface areas of the faces being such that when the pressure differential between the first and second spaces is above a given valve the inlet valve is held open and the outlet valve is held closed, but when the pressure differential falls below the given value the outlet valve is opened and the inlet valve is close

Abstract: An impact absorber, particularly for automobile fenders, comprising a cylinder, a piston on one end of a piston rod and slidable in the cylinder, an annular partition slidable on the piston rod, and a valve carried by the piston and allowing, on compression of the impact absorber, flow from the chamber beyond the piston to the annular chamber between the piston and the partition. The valve is biased in the closing direction by a spring and has a valve member with opposed differential areas which are exposed to the pressure in the said chamber and are selected to bias the valve in the opening direction.

Abstract: For use in a sprinkler system a pressure and flow regulation device comprising a snap acting valve which includes a movable valve closure having a spring biasing the valve closure toward a closed position and a diaphragm having a surface disposed to be acted upon by inlet water pressure to urge the valve closure to an open position against the bias of the spring, only when a predetermined inlet pressure is reached, and a pressure regulator constructed integrally with the snap acting valve for automatically regulating the pressure of water supplied to a sprinkler to a selected level.

Abstract: A pressure transfer unit having a movable partition including a flexible bellows for separating an internal, controlled-pressure chamber from a reference-pressure chamber. A valve is provided for limiting the volume of liquid that can be injected into and received in the controlled-pressure chamber during filling or refilling thereof. A spring biases the partition to apply a predetermined force to the partition and to shut off fluid transfer in the event of bellows failure. The unit is arranged for simple and rapid assembly and disassembly.

Abstract: In a pressure surge relief system wherein a valve opens to relieve the pipeline when line pressure overcomes a pilot chamber gas pressure and including an accumulator which transfers the pressure of the pipeline liquid to the gas in the pilot chamber, the improvement comprising a column of relatively inert fluid which isolates the elastomer components of the accumulator from the possibly corrosive pipeline fluid.