Abstract: An improved pilot valve is disclosed having a flow path from the inlet to the sense cavity via the valve spindle. An articulated disk is provided at the bottom of the valve spindle and is secured thereto by a hollow screw. Such articulated disk can adjust itself to the valve seat below to provide sealing of the valve to the seat in cases where the valve spindle is not perfectly axially aligned with the seat. A spacer between the upper and lower diaphragms is provided for maintenance of proper effective areas of such diaphragms and for prevention of resistance to valve stem motion.

Abstract: A valve device takes the form of a multi-part cartridge with a hollow stepped housing containing a stepped rod. A control piston at one end of the rod is opposed by the force of a main spring in a main chamber remote from the control piston. A valve closure member is axially displaceable relative to the rod. The valve closure member is normally held against a valve seating but pressure on the control piston displaces the rod and causes the valve closure member to be lifted from its seating via stop faces. An auxiliary chamber in the housing leads via a connection to some consumer appliance and forms, the downstream side of the valve. A compensating piston on the rod member opposes a face of the valve closure member open to the auxiliary chamber. A further spring in the auxiliary chamber holds the valve closure member on its seating. The valve can open independently of the control piston should the pressure on the upstream side of the valve exceed the consumer pressure.

Abstract: An apparatus is provided for controlling discharge of fuel vapor and liquid fuel through an aperture in a fuel tank. The apparatus comprises a housing mounted in the aperture and formed to include a venting outlet, and a blocking mechanism for blocking the flow of fuel vapor through the venting outlet. The apparatus also includes a mechanism for using pressurized fuel vapor from the fuel tank to move the blocking mechanism from a flow-blocking position to a flow-delivery position. The using mechanism includes a diaphragm appended to the blocking means for movement therewith. The apparatus further includes a second mechanism for using fuel vapor discharged from the fuel tank to provide a pressure cushion acting against the diaphragm to urge the diaphragm from its second position toward its first position.

Abstract: A brake control system having a vent valve device in which a control piston is effective to unseat a normally closed vent valve to provide rapid exhaust of brake pipe pressure to either propagate an emergency brake application in response to brake pipe pressure on one side of the piston being reduced at an emergency rate or to initiate an emergency brake application when pressure on the opposite side of the piston is increased by an auxiliary pilot valve connected to a second main reservoir at a higher pressure.

Abstract: A vacuum processing system and method by which system turbulence is reduced utilizing a vacuum responsive flow controlling valve that is located between a vacuum pump and a vacuum processing chamber to restrict the rate of pumpdown. A valve member of the flow controlling valve, such as a butterfly valve closure plate, is positionally shifted by a pressure differential responsive actuator as a function of the extent to which the pressure in the vacuum processing chamber has been reduced by the pump. During the initial phase of pumpdown, the valve closure member is in its maximally closed position, with evacuation of the vacuum processing chamber occurring solely through a leakage path past the valve member. After a predetermined pressure is reached, the valve member slowly opens as the pressure differential in the actuator increases, until a maximally open position is achieved.

Abstract: A relief valve to be disposed in a hydraulic circuit, for example an absolute circuit, such as in an industrial construction machine, comprises a casing of substantially cylindrical structure having one end and another end, the casing including a casing body, a pressure regulating plug and a lid member. The relief valve further comprises a valve seat fitted into one end of the casing and provided with an inflow hole through which a pressurized fluid is flown, a plunger disposed in the casing and having one flanged end slidably engaged with an inner surface of the one end of the casing, the plunger having a central through hole, a stepped piston member disposed in the casing to be slidable therein and having an outwardly stepped one end and a spring member disposed between another end of the stepped piston member and the flanged one end of the plunger. A fluid chamber is defined between another end of the casing and the one end of the stepped piston member.

Abstract: The regulator second stage for scuba incorporates a semi-balanced valve mechanism of high flow capacity which operates without significant influence from friction. The compression spring is suspended between two axially opposed pins to avoid friction producing contact with the housing walls. The valve mechanism is suspended between a dynamic seal and a lever assembly to avoid friction producing contact with the housing walls. The valve controlling lever rotates a ball bearing and collar mechanism in which ball bearings cooperate with notches to provide high mechanical advantage with very low friction. The diaphragm and exhaust valve cooperate to provide stable interaction which conserves breathing gas during all orientations of the regulator second stage.

Abstract: A valve device comprises a vertical, tubular housing, a vertical valve member in the housing, and a coil-form compression spring encircling the member and urging it upwardly against a valve seat in the housing lower end. The member includes an upper, obturating portion and a lower, closure portion and its internal surface includes an upper annular part which diverges downwardly at a gradually increasing angle away from the location of the obturating portion in the valve closed condition. The internal surface includes a lower annular part converging downwardly at a substantial angle to the housing axis and situated directed radially outwards of the spring. Below the seat is an outlet mouth encircled by a rim, the closure part having a bottom lip at such clearance relative to the rim that, shortly before the closure part seals against the seat, the rim and the lip act shearingly upon liquid therebetween. The member includes three guiding fins in sliding contact with the internal surface.

Abstract: The integrated multifunction regulator station for gas supply to secondary user mains from a principal distribution mains, comprises a single external housing having an essentially cylindrical shape, designed to withstand the gas operating pressure, in which are contained active elements including at least a filter, a pressure regulator and a safety valve.A flow meter and the pressure regulator are mounted on a traversal wall. The filter is formed from a cylindrical cartridge located between a removable bulkhead and the pressure regulator, which is itself mounted on the tranversal wall. The safety valve is mounted on the removable bulkhead and includes a safety valve head located upstream of the pressure regulator, at a to part of the latter, and inside the cylindrically shaped cartridge.

Abstract: A pressure-relief valve device employs a connector welded to the base of mining equipment equipment such as an hydraulic prop, so as to communicate with the pressure fluid in a working chamber thereof. A housing is screwed into the connector and the connector has an outflow passage leading to the surroundings. A valve composed of a fixed valve seating and a movable closure member opens and closes communication between the working chamber and the outflow passage. A spring holds the valve closure member on the seating. The valve closure member is slidably guided on part of a tappet subjected to spring force. The tappet has a piston exposed to the pressure fluid which opposes the spring force. If excess pressure occurs the tappet moves against the spring force and lifts the closure member off the seating. Once the pressure drops the tappet moves back under the action of the spring but the closure member can move more slowly to gently re-establish the valve action.

Abstract: A refrigeration system for use in an automotive air conditioner comprises a compressor for compressing vapor-phase refrigerant, a condenser connected to the outlet of the compressor, an expansion valve connected to the outlet of the valve, and a vapor pressure-adjusting valve mounted in the passage extending from the evaporator to the compressor. When the vapor pressure inside this passage is less than a certain value, the adjusting valve reduces the flow of refrigerant from the evaporator to the compressor to maintain the vapor pressure constant. A part of the liquid-phase refrigerant on the downstream side of the condenser is added to the refrigerant evaporated by the evaporator, by means of the adjusting valve.

Abstract: The invention contemplates a valve construction which provides a radially stacked succession of mutually fitted concentric annuli fitted to an inner tubular member which is open at one end for accommodating inlet fluid flow and which is adapted along its bore and at the opposite end to guide a poppet member that is axially positionable in the bore. The tubular member has a circumferentially and axially distributed plurality of like radial passages adapted to be opened and closed in accordance with the guided position of the poppet member. Progressively increasing pluralities of such radial passages characterize each successive annulus, and all annuli are circumferentially channeled to define a manifolded relation between the plural passage discharges from one annulus and the plural passage inlets of the next annulus. Outlet or downstream flow from the valve is taken from a circumferential manifold around the outermost multiple-ported annulus.

Abstract: Apparatus is provided to increase the retarding horsepower of a compression release engine retarder driven from the exhaust valve pushtube or the fuel injector pushtube which includes a plenum communicating with the exhaust valve slave piston and the master piston driven by a remote exhaust valve pushtube or the fuel injector pushtube. A trigger check valve is located between the master piston and exhaust valve slave piston so that the initial motion of the master piston delivers energy to the plenum. At a predetermined point in the travel of the master piston, the trigger check valve is opened by the master piston to permit the delivery of the energy stored in the plenum to the slave piston. Additional pumping capability is provided by a second master piston while a control check valve communicating with the second master piston limits the intake of hydraulic fluid into the system after working pressures have been attained to that hydraulic fluid which may leak from the system.

Abstract: A nozzle/venturi with a bypass for controlling the pressure differential and therefore the amount of air which is entrained into the fluid stream. The nozzle/venturi assembly is utilized in a filtering system for removing contaminants from a water supply. The nozzle/venturi assembly includes a nozzle/venturi with a water inlet, an air inlet and an outlet passage and a bypass valve with an adjustable passageway to control the fluid flow through the bypass. The bypass valve includes a diaphragm which is effected by the downstream pressure resulting in an adjustment of the pressure differential and a spring biased seal valve to control the pressure which will open the bypass. The nozzle/venturi assembly provides efficient and precise control of the pressure differential to ensure that a constant amount of air is entrained into the fluid stream through the entire pump cycle.

Abstract: A closed loop breathing system includes a face mask, a pressurized bottle of oxygen-rich breathing gas, and an exhalation hose and an inhalation hose both coupled to the face mask. Flexible breathing bags smoothen the flow of expired gas through the system, and a container of sorbent material removes CO.sub.2 from the expired gas. A mixing valve mixes expired breathing gas from the face mask with oxygen-rich breathing gas from the pressurized container. A balanced exhalation valve assembly coupled to the exhalation hose includes a main valve which passes the flow of expired gas from the exhalation hose into a chamber and prevents the reverse flow of gas from the chamber into the exhalation hose. A flexible diaphragm forms one wall of the chamber and is coupled to the main valve by a rigid spacer to prevent a pressure increase in the chamber from increasing the force necessary to open the main valve.

Abstract: An improved wheel end valve assembly (11A) for a central tire inflation system (10) having a single connection (68) to a tire chamber (74) and a single supply connection (62) to a source ( 142) of pressurized fluid, which requires no venting other than through the single supply connection (62), is effective in response to pressurization and venting of the single supply connection (62) to open and close communication to the tire chamber (74), and which is not affected by ambient temperature changes nor susceptible to leakage into and out of a trapped air volume employed by prior art valve (11) disclosed herein. The valve (11A) is actuated by air pressure and is resiliently biased into closed position by a spring (342) positioned within an evacuated bellows (334).

Abstract: A back pressure valve accumulates therein a predetermined amount of fluid having pressure higher than a predetermined level.The back pressure valve comprises a casing having a chamber formed therein, which chamber is communicating with an inlet port and an outlet port, a piston which is slidably installed in the casing, an elastic member which urges the piston toward the inlet port, and a relief valve which opens when pressure in the chamber exceeds a predetermined pressure level so as to permit flow of fluid from the inlet port to the outlet port.The back pressure valve further comprises a cylindrical piston which is slidably inserted between an outer periphery of the piston and an inner periphery of the casing, and an outer elastic member which urges the cylindrical piston toward the inlet port.The back pressure valve minimizes occurrence of trouble due to clogging of contaminations though it is simple in construction and inexpensive.

Abstract: In the pressure control valve assembly according to the present invention, a plurality of communication passages or slits is formed in either the movable throttling plunger or its associated stationary seat portion, and such passages are so arranged that their effective communication area is variable with the plunger movement relative to the seat portion in the region where the plunger is positioned close to its full-throttling position, whereby throttling of the refrigerant gas in such a region is achieved through the effective communication area of these passages.

Abstract: A fluid flow control valve meters, in response to a fluid control signal, fluid flow received at a supply pressure and released at an output pressure utilizing a folded elastomeric diaphragm as the fluid flow metering member. The diaphragm regulates fluid flow through a passageway in a piston disposed in a valve body, which passageway provides for fluid communication between a fluid supply port and a fluid output port. The piston is displaced as a function of control signal fluid pressure, which in turn produces a change in the relationship between the folded-over portion of the diaphragm and an outlet duct of the piston passageway.

Abstract: The invention relates to a process for improving the characteristics of a fluid and in particular of a cement slurry for the cementing of wells, particularly of oil wells, wherein it consists in applying to this fluid an energy of between 4.8 and 6.3 kJ/kg, by incorporating adapted pressure drops, in line, before the well head and at the outlet of a high-pressure pump, said pressure drops being substantially independent of the flowrate. The invention also relates to a device for carrying out this process.

Abstract: A valve for controlling a pressure differential between a high and low pressure, characterized by a housing being sub-divided by a transfer port into a first and second chamber, each having ports, a valve member movable in the first chamber to close the transfer port, a spring arrangement for urging the valve member to a closing position, a membrane extending across an opening end of the housing, which is in communication with the first chamber and held on by a cap forming a third chamber having a port and means for connecting the valve member to the membrane so that when a pressure differential between the pressure in the first chamber and third chamber exceeds the value of the spring arrangement, the transfer port is open to allow passage of the pressure in the first chamber into the second chamber.

Abstract: Constructed in a cylindrical body (10) are a central chamber (16) fitted with a release hole (24) and two opposing chambers (18, 20). The ends of a floating piston (26) are engaged in these opposed chambers and subjected to both the pressure to be controlled and a reference pressure. A cylindrical box (34) integral to the piston (26) slides in the central chamber (16). In the closed position, the box (34) closes the release hole (24) to form a seal and the piston (26) closes the chamber under control (18) without forming a sealed closure. In the open position, a radial hole (48) cut in the wall of the box (34) is opposite the release hole (24). A decompression of the central chamber (16) is obtained as the valve starts to open (narrow channels 52) and a deceleration of the box (34) is obtained at the end of this opening (hole 44 and stud 54). Applications: Pressure relief valve for the oil industry, reactionless valve, pressure control nozzle.

Abstract: A compressed air breathing apparatus, in particular for underwater diving, comprising a compressed air supply (1) communicating with a chamber (15) for expanding the compressed air, through a valve (6,7,2,10,13,3,14) whose opening and closing are controlled by a diaphragm (4) responsive to the inhaling effort on the part of the user, and a mouthpiece (22) comprising a conduit (21) which puts the expansion chamber (15) in communication with the mouth of the user. According to the invention, the conduit (21) of the mouthpiece (22) includes a tongue (5) for forming an obstacle to the free flow of the air from the expansion chamber (15) to the mouth of the user, the tongue (5) being so arranged that the depression required for opening the valve is between -6 millibars and +6 millibars for a rate of flow of 400 liters/min. The tongue (5) is adjustable as to position to vary the extent to which it impedes free flow of the air.

Abstract: A breathing regulator especially suited for use in scuba diving comprises an externally adjustable flow vane or deflector to redirect a portion of inlet high velocity air towards the diaphragm of a venturi initiated vacuum assist-type regulator configuration. The flow vane interrupts and redirects a selected portion of the air stream thereby balancing the low pressure area adjacent the diaphragm at a constant level throughout the breathing cycle. As a result, the diver can adjust his inhalation effort requirements to be constant throughout the breathing cycle.

Abstract: A pressure-relief valve device has the stem of a valve member guided within a sealed bore of a guide piece screwed into or onto a sleeve-like housing. A spring in the housing acts on a pressure disk to create closure force on the head of the valve member. A connector, which may provide a plug-in connection to some equipment to be controlled, is in screw-threaded engagement with the guide and can be removed to provide ready access to the valve member without disturbing the remainder of the assembly and its setting. The valve member has a piston opposite the head which fits in a recess in the connector. An end wall of the recess forms a stop limiting the closed position of the valve and an end face of the guide forms a complementing stop face limiting the open position of the valve.

Abstract: A pressure control valve (10) comprises a first element (14) arranged to pivot relative to a second element (18) in response to inflation and deflation of a sac (16) interposed between the elements, the second element having a fluid passageway (32, 34) including an outlet (32a) which is controlled by said first element by virtue of its pivotal movement, said fluid passageway communicating with said inflatable sac, means (30) being provided to adjust and limit the pivotal action of the first element.

Abstract: A piston (36) divides the valve interior into a main chamber (38) and a sensing chamber (40). A fixed valve seat (26) sealingly engages the piston (36) to close communication between the chambers (38, 40). The seat (26) is carried by an axial stem (20) which extends through an opening (42) in the piston (36). The valve inlet (14) extends through a passageway (22) in the stem (20) into the main chamber (38). An outlet (28) is formed in the main chamber (38). A valve element (62) closes the outlet (28). When pressure is higher in the main chamber (38) than in the sensing chamber (40), the piston moves toward the sensing chamber (40) to open communication between the chambers (38, 40). When there is a pressure drop in the main chamber (38), the piston (36) moves toward the main chamber (38) to open communication between the chambers ( 38, 40) and move the valve element (62) into an open position.

Abstract: A fluid flow regulator including a servo valve assembly and a throttle valve assembly. The servo valve assembly includes a pair of double acting actuators, biased in one direction by an adjustable spring, contoured ports and piping passageways to the ports and to other chambers of the assembly. The actuators are effectively connected together and function to oppose each other. The chambers formed between the two actuators and the respective cylinder chambers formed on the exterior ends of each actuator are used for pressure sensing purposes. Each individual actuator may be comprised of up to three piston lands with adequate separation between to form chambers for fluid transfer purposes. Any leakage or servo flow entering these chambers would be communicated by passageways to appropriate interface ports on the regulator. Due to its sensitivity, the servo valve assembly effects a desired action by variably restricting the flow or pressure in a passageway controlled by the throttle valve assembly.

Abstract: A device for regulating the pressure of a tire on a moving vehicle includes an inlet channel to be linked to an exterior pressure supply, an outlet channel on the tire and normally closed by a valve head, as well as a mechanism which, responding to the pressure from the supply line, pushes against the valve head to open it. This mechanism includes, within a chamber directly communicating with the supply channel, a moveable assembly one of the surfaces of which is directly submitted to the pressure of the chamber, while the other surface is submitted to the same pressure by means of a calibrated outflow channel or restriction outlet introducing a delay in the establishment of the pressure.

Abstract: A valve for use with irrigation systems. The valve is fluid pressure actuated and includes a two part movable upper valve body portion which seals about the mouth of a pipe. A pedestal is threadably secured to the pipe and guides the movable valve body. The valve body is biased against the pipe by a spring connected to the pedestal.

Abstract: A valve head of the pressure relief valve is urged into the closed (seated) position by a spring, assisted by a force derived from pressurized fluid which is situated in a chamber behind the valve head and which is admitted thereto from the upstream side of the valve seat through a chamber in the valve head. The chamber in the valve head is open toward the inlet port of the valve and is partly defined and surrounded by a skirt-like extension oriented transversely to the axis of the valve inlet port. The diameter of the chamber whose opening has a plane generally perpendicular to the direction of valve head motion, is at least as large as the diameter of the valve intake port. In the seated (closed) state the skirt-like extension reaches transversely into the inlet port at least as far as the axis of the inlet port and in the maximum open position the skirt-like extension is at the most just clear of the inlet port.

Abstract: A pressure-relief hydraulic valve device for mining equipment is composed of a hollow sleeve mounting a guide with a through bore slidably receiving the stem of a valve member. The stem is provided with a blind axial bore leading to a set of radial bores and a seal in the bore of the guide co-operates with the radial bores to form a valve. A spring accommodated in the sleeve acts through a shaped pressure member to urge the valve member to a position with the valve closed. Pressure fluid in equipment to be protected acts on the valve member and excess pressure displaces the valve member against the spring force to open the valve and permit the escape of fluid via an outflow chamber and outlets in the sleeve. The pressure member has a piston like flange guided within the sleeve against which the spring bears and the underside of the flange of the pressure member is shaped to provide a concave guide face in the outflow chamber.

Abstract: A valve for use in medical applications is disclosed which is a highly precise, passive, one-way valve which makes an excellent inlet valve or outlet valve in a drug infusion pump. The valve operates with a very small forward pressure, requires only a small amount of fluid in the valve chamber, and operates in a positive and predictable fashion, even after an extended shelf life. The valve, may be inexpensively molded in one piece, thereby facilitating construction of a disposable pump, and may be installed with the portion of the pump housing contacting the top surface of the valve being flat, thereby further reducing manufacturing costs.

Abstract: A control for use by a patient who is connected with a respirator comprises a valve housing which has an interior valve chamber with a gas inlet extending into the chamber and terminating at an annular valve seat which is closable by a diaphragm. A gas outlet is also connected into the valve chamber. The valve housing also has a control chamber in the opposite side of the diaphragm from the valve chamber and an inhaling gas supply connection extends into the control chamber. In addition a gas take-off conduit connectable to the patient is connected into the control chamber. The gas take-off is provided with an orifice plate which defines a reduced area in the take-off so that during use by the patient during inhaling a pressure lower or higher than the pressure in the valve chamber is produced in the control chamber and opening or closing of the diaphragm end valve is effected to permit or prevent exhaled gas to pass through the gas inlet connection to the valve chamber and then to the gas outlet.

Abstract: A traveling valve or a standing valve for an oil well lift pump 10 includes a piston 36 which lifts a ball 50 above the valve seat 48 to open the valve and sets the ball 50 back onto the seat 48 to close the valve. The ball 50 is contained within a ball protection shield 52 which prevents uncontrolled movement by the ball 50 inside the middle tube 18. The piston 36 has openings 42, and the ball protection shield 52 has apertures 60 which allow fluid to flow through the the valve without engaging the ball 50.

Abstract: A pressure relief valve and regulator in which the valve chamber has a side port for connecting to the pressure line to be monitored. The valve seat opens to an exhaust and has a diameter slightly larger than the chamber diameter. The valve incorporates a double ended piston, spring, and cam whereby the cam offsets the normal compression gradient of the spring by rotating as the piston moves in and out.

Abstract: The disclosure sets forth a breathing gas second stage regulator having a tilt valve for introducing breathing gas into a breathing box through means of a diaphragm flexing into the interior thereof. Lever means connect the tilt valve to the diaphragm so that as said diaphragm flexes internally it causes said lever to move and actuate the valve. A mouthpiece is connected to the interior of the chamber of the regulator for providing an inlet and outlet to a breather. The chamber at the mouthpiece interface is configured with a curved surface to enhance laminar flow and reduce turbulent flow into the chamber from the mouthpiece upon a user's exhalation. The curved surface limits backflow and stall, as well as limiting the separation of exhalation exhaust until proximate an exhaust valve. An exhaust valve opening within the chamber walls has an exhaust valve therein so that exhaust upon exhalation from a user can pass through said exhaust valve outwardly.

Abstract: A device with use in combination with an expansible sleeve-type gas flow control valve in a production gas supply between a compressor and a delivery line provides pressure differential control as between the valve inlet and the valve outlet by relating hydraulic control pressure around the resilient sleeve of the valve to valve outlet gas flow pressure through a primary piston and cylinder assembly. The primary piston is linked to a secondary piston in a secondary cylinder of smaller diameter which in turn communicates with an accumulator for dampening pulsations in the valve.

Abstract: A conduit flushing device comprising an elastomeric tubular body having one end thereof to be connected to a suitable source of water under pressure with the opposite end of the tubular body being connected to a valve. The valve is normally closed by an integral portion of the tubular body being in watertight contact with an elongated sealing member of the valve. Supplying of water within the tubular body causes the body to expand spacing the seat assembly from the sealing member permitting flow of water from the internal chamber of the tubular body and through the valve.

Abstract: A direct acting subsurface safety valve. During normal well flowing conditions, an operator sleeve is spring biased to hold the valve closure mechanism in its open position. If the rate of change of fluid pressure flowing through the valve exceeds a preselected value, a pressure sensitive piston will shift the operator sleeve to close the valve. A latch mechanism is provided to prevent undesired closure of the safety valve by acceptable pressure transients resulting from normal changes in well operating conditions.

Abstract: A pressure-limiting valve comprises a cylindrical actuator piston guided displaceably in a bore and held under the pressure of a spring in the closure position of the valve. Longitudinally-directed throughflow passages are formed in the actuator piston on the pressure-loaded end and are arranged concentrically with respect to the central axis and open into an annular groove extending around and in the circumferential surface of the actuator piston. This groove is sealed off by a gasket mounted in the bore wall. When the set pressure predetermined by the closure spring is exceeded, the actuator piston travels with the gasket over the annular groove so that the pressure medium can flow away through the outlet opening.

Abstract: A pressure relief valve is disclosed. The pressure relief valve comprises a valve housing including fluid passageways, a poppet valve disposed within the housing, a piston disposed within the housing, and spring means disposed intermediate the piston and the poppet valve for biasly urging apart the piston and the poppet valve. The poppet valve has a valve seat which, together with a portion of the housing, defines a variable valve area. The piston has a piston area, relatively greater than the variable valve area, for modulating flow through, and pressure drop across, the poppet valve. The pressure relief valve preferably includes an orifice disposed within the housing for selectively controlling flow of hydraulic fluid through the housing passageways to the piston. The housing preferably includes an elongated cage within which the poppet valve is longitudinally slidable.

Abstract: Compressor inlet control devices control the pressure level at the inlet of a compressor (18) which is operated by an engine (10) equipped with a turbocharger (12) that maintains the intake manifold (16) of the engine (10) at pressure levels greater than atmospheric for most engine operating conditions. A valve (20) limits the pressure level at the inlet of the compressor (18) to a predetermined pressure level to prevent damage to the compressor (18). The valve (20) includes a pressure differential responsive piston (36) which responds to the pressure level at the valve inlet (52) to close a pair of valve members (60,62) to terminate communication between the valve inlet (52) and outlet (54) when the pressure level at the inlet (52) exceeds the predetermined pressure level, and to initiate communication between the inlet (52) and outlet (54) when the pressure level drops below the predetermined pressure level.

Abstract: A valve device for use in filling cartons includes a tubular housing containing a valve member comprising a closure part co-operating with a valve seat at the lower extremity of the housing, and a driving part movably received with clearance in the housing. During the latter part of the opening movement of the valve member against a spring, the clearance increases smoothly and considerably, and the driving part reaches a force equilibrium position at which the clearance is considerable. Two grooves formed in the housing and the valve member immediately below the annulus of sealing bound an annular enclosed space for receiving liquid squeezed out downwardly at the valve seat.

Abstract: A clutch pressure control valve for a hydraulically actuated friction clutch which includes a valve spool 5 disposed within a valve bore and having two control collars 6 and 7. The spool is acted upon at one end by a linear compression spring 8 and a speed dependent pressure signal, the spool serving to regulate the clutch pressure by regulating the free cross section at an outlet port disposed between its control collars. To avoid the second order variation of the clutch pressure with speed, the control collars 6 and 7 of the valve spool 5 have two different diameters and the spool 5 is disposed within a stepped bore 2, 3 and 4. The end of the linear compression spring 8, remote from the valve spool 5, abuts a reaction piston 9, which is disposed within the valve bore and is acted upon on one side by the speed dependent pressure signal and on the other side by a second, non-linear compression spring 11, which is compressed between the reaction 9 and a shoulder 12 in the valve bore.

Abstract: A control device for use with a respirator which has a breathing gas supply and a separate pressure gas supply comprises a gas control device housing with a connection for the patient and a bottle pressure line and a medium pressure line connected to the device and controlled by valve elements. A lung machine for respirators must guarantee, even upon failure of the important pressure reducer in the respiratory gas feed line, that the apparatus user is supplied with respiratory gas. This is done here in a simple manner by bypassing a swivel valve controlled by means of a breathing diaphragm. A piston valve, connected via a control line with the medium pressure P.sub.MD and, directly with the high pressure P.sub.HD, opens upon failure of the medium pressure and through the high pressure always present, directly a high pressure valve contained in the piston valve.

Abstract: A divers two-stage gas reclaim back pressure regulator is described having mutually concentric side-by-side annular first and second chambers interconnected by a central tubular duct one end of which is cooperable with a first stage diaphragm to form a first stage valve. A third chamber for connection to a gas reclaim line is disposed between the first and second stages and communicates with the latter by way of a plurality of radially-increasing-in-size openings through an annular land of convex configuration on which a second diaphragm seats. A biasing compession spring for the second stage is located in the mentioned tubular duct. An auxiliary closure is provided by a valve element carried on the second diaphragm and capable of seating on the second stage end of the duct. The arrangement is compact, demands relatively low exhalation operation pressure and is tolerant of intruding foreign matter.

Abstract: An adjustable fully automatic vacuum modulator control, for use in vehicles having automatic transmission with a vacuum modulator includes a cylinder which contains a slidable piston and front face having an adjustable stop to regulate the vacuum flow. Three ports communicate with the interior of the cylinder and the position of the piston changes during conditions of acceleration and deceleration.

Abstract: A demand regulator for use in underwater breathing apparatus employs a vane member dividing the mouthpiece tube into two adjacent air passageways. An interior end of the vane is configured as an air deflector for conducting pressurized air out of the mouthpiece tube substantially through only one of the passageways. The opposite end of the vane is provided with an inclined tab for applying back pressure to the air exiting from the mouthpiece tube, whereby the venturi action of the exiting pressurized air, and consequent free flow tendency of the regulator, are controlled.

Abstract: The invention relates to a container for flowable or otherwise extrudable materials, the container having a discharge barrier which comprises a dividing wall dividing the container space into an outer chamber which is in communication with a dispensing opening of the container and into a storage chamber in which the contents can be subjected to pressure for dispensing from the opening and can thereafter again be relieved of pressure. The dividing wall is formed with a membrane section having at least one valve opening which upon pressure loading of the membrane section from the side of the storage chamber opens against a restoring force exerted by a membrane mounting and which upon relief from pressure automatically closes again under the restoring force. The dividing wall is also formed with a holding element which is connected to the container in a manner that takes up manufacturing tolerances.