Abstract: The invention relates to a valve system for a space (1) which is under vacuum in relation to its surroundings (3), which valve system comprises a valve unit (7) which is intended to be arranged in association with a wall (2) which delimits the said space and has a wall opening (4) through the said wall, which valve unit comprises a valve (8) which is normally shut and closes the said wall opening but is arranged to be opened and allow air from the surroundings into the said space if the vacuum, i.e.

Abstract: A pressure relief valve for releasing fluid through a vent in a railway tank car, tank trucks and similar vessels. A valve disk is normally biased in a closed position by a plurality of constant-force springs of laminated steel tapes on drums supported on upright angle brackets symmetrically arranged around a valve seat. The pressure at which the valve opens is determined by a preselection of the number of springs, laminated tapes per spring, and the restoring force of each tape.

Abstract: A Condition Sensing Hydromechanical Fuze to sense hydraulic line flow for velocity, volume, direction and flow measurement. The fuze is self adjusting with temperature changes and safely enables hydraulic circuit segregation and cross porting to maintain normal operation of a primary hydraulic circuit following degradation or failure of a secondary hydraulic circuit in a dual input manual vehicle brake system or other nonbrake system application which requires the ability to segregate one portion of the system from another based on regulated flow volume and rate.

Abstract: A solenoid valve, whose valve member is acted upon by a feed pressure in a closed setting by the feed pressure obtaining in an inlet duct. In order to render possible rapid switching operations a moving ancillary drive member is provided which is acted upon by a control pressure and which acts through an outlet duct in the opening direction, and hence against the feed pressure, on the valve member.

Abstract: A device for preventing a fluid from flowing in a canister used in an automobile comprising a casing of a hollow cylindrical shape having an inlet and an outlet, the outlet being connected to a vent pipe of the canister and the inlet being connected to the atmosphere, a funnel-shaped plate having a venting port in its center and airtight-coupled to a inner surface of the casing, a bladder positioned below the funnel-shaped plate, having a gating portion fittable to the venting port of the funnel, and biasing means for urging the gating portion of the bladder against the venting port of the funnel-shaped plate.

Abstract: An electromatically operated valve for automatic setting of a reduced flow cross section effective for a closed position of the valve is to be achieved. The valve has, in a valve dome, a longitudinally movable magnet armature with a separate valve push-rod which carries a closing element of a first seat valve which is open in the rest position. The first seat valve is located in a valve chamber from which a first pressure medium passage leads to a control chamber remote from the closing element and a second pressure medium passage leads to a control chamber, near the closing element, of the magnet armature. In addition, a second valve formed from the magnet armature and the valve push-rod is provided by means of which a connection between the first pressure medium passage and the second control chamber can be switched on and off.

Abstract: A pressure control valve, fabricated using micromachining techniques, comprises, in one embodiment a substrate having a central orifice therein and having a sealed chamber formed therein, one wall of which being defined by a flexible membrane. An inlet control element is supported by the membrane such that it is disposed over the central orifice, such that normally a gap is defined between the inlet control element and the central orifice and hence the valve is open. When the pressure differential, between external pressure and pressure in the chamber, exceeds a predetermined threshold, the membrane deforms, drawing the inlet control element toward the substrate such that the inlet control element seats over the central orifice, closing the valve. In another embodiment a flexible membrane cooperates with a valve substrate to form a closed chamber, and a valve lid, coupled to the membrane, extends over one or more holes in the substrate, forming a gap between the valve lid and the substrate.

Abstract: A flow-responsive diverting valve is particularly useful with pressure washers of the type having a water pump coupled to an internal combustion engine equipped with a pull-rope starter. The valve provides an "easy-start" feature and has a valving chamber and a fluid inlet and two fluid outlets. A magnet is fixed on the valve body and when fluid flows into the inlet at the low flow rate occurring when operating the starter, a valving device, e.g., a check ball, is restrained by the magnet. When fluid flows into the inlet at a higher flow rate (as when the engine is running and the pump is delivering water at a substantial rate), the device closes the first outlet and diverts water to the second outlet. A method for operating a pressure washer includes magnetically restraining the valving device away from the first outlet while operating the starter and then running the engine, thereby urging the device to close the first outlet.

Abstract: A magnetic valve that switches at high differential pressures and furnishes a large flow cross section. The magnetic valve has an armature, which when current is supplied to a coil is movable toward a pole core counter to the force of a restoring spring. The armature is capable of opening an auxiliary valve of small sealing diameter directly and a main valve of large sealing diameter indirectly. The auxiliary valve and the main valve have a common closing body, which is movable relative to the armature with a limited stroke. The auxiliary valve communicates through a conduit of the closing body with the outflow side of the magnetic valve. In the open position of the magnetic valve, the closing body is held by a stop ring of the armature. The magnetic valve is suitable in particular for slip-controlled hydraulic brake systems of motor vehicles.

Abstract: A pressure relief tire valve for inflating a tire wheel assembly has a tire inflation valve body having a chamber therein with openings through the top and bottom ends thereof and having a relief opening formed in the tire valve body. An inflation valve having a spring loaded central core to allow to pass inward is located in the tire valve body adjacent the tire inflation valve body top end for inflating the tire therethrough. An overpressure valve is located in the tire valve body for releasing air from the tire when the air pressure in the tire exceeds a predetermined level.

Abstract: The present invention relates to a valve system for the hermetic reciprocating compressor, and more particularly, to reduce the gap volume of the spouting hole so as to help smoothly spout out the refrigerant through the spouting hole formed at the valve plate, to increase the amount of the refrigerant to be sucked into the cylinder, to increase the density of the sucked refrigerant, and finally to improve the efficiency of the hermetic reciprocating compressor.

Abstract: In a valve, the valve poppet member is constructed from a spring material where a tubular wall portion has a spiral wall configuration intermediate of a supporting base and a valve head. The spiral wall configuration has inner and outer diameters, a specific number of revolutions with a spiral width and a width of material remaining to provide sufficient cantilever strength to support the valve head and has the desired spring rate to seat the valve head on a valve seat.

Abstract: The pressure-relief valve (10) has a valve member (18), which interacts with a valve seat (17). The valve member (18) is forced with a certain pretensioning against the valve seat, which pretensioning is applied by way of a diaphragm (21), either directly by this or by virtue of an additional spring means. Whenever a predefined maximum pressure is exceeded, the diaphragm (21) comes to bear against a stop face (26). Due to the free guidance of the valve member (18) tight, contamination-sensitive gaps are avoided. Although the pressure-relief valve is compact, secure bearing contact of the valve member against the seat is nevertheless ensured (FIG. 1).

Abstract: A poppet check valve for resisting fluid flow through an orifice in a backflow direction includes a valve element, a valve seat defining a valve orifice, and at least first and second torsion springs mounted to apply a pre-determined closing force to bias the valve element toward sealing engagement upon the valve seat. The pre-determined closing force applied by each torsion spring has an axial component, applied in the axial direction, and a lateral component, applied generally transverse to the axial direction. The axial component has a first value with the valve element in a first position and a second value with the valve element in a second position more spaced from the valve seat, the first value being greater than the second value. The lateral component also has a first value in the first position of the valve element and a second value in the second position, the first value being less than the second value.

Abstract: An induction regulator valve is incorporated in the induction manifold of a compressor to provide for infinitely variable regulation of the output from the rotary type compressor, in particular the screw-type compressor. The closing piece of the induction regulator valve can be adjusted by means of an actuator system. To improve this regulation performance of this system, in particular to reduce its sensitivity when the regulator valve is almost closed, the spring system is formed so that its stiffness varies along the length of its spring path, the stiffness of the spring system being smaller when the induction regulator valve is open than when it approaches the closed position of the closing piece of the induction regulator valve.

Abstract: A toilet having a seat section that includes a bowl with a bottom discharge opening. The toilet also includes a source of flush water for rinsing the bowl and removing waste through the discharge opening into a waste storage tank. A pump provides the flush water through a nozzle which directs the flush water into the bowl. A check valve is associated with discharge nozzle to prevent flush water from inadvertently leaking into the bowl. The check valve is capable of being used with either a manually actuated pump or a power assisted pump and reduces the force required by the pump to maintain the valve open than to initially open it.

Abstract: A pressure cooker pressure regulator having at least two operating thresholds, the regulator being of the type comprising a valve body fixed to the lid of a pressure cooker and having a valve seat formed therein, and a needle carrying a rating mass and bearing against the seat, the regulator is such that the needle is slidably mounted relative to the rating mass, that a spring is interposed between the needle and the rating mass, and that means are provided for adjusting the force exerted by the spring on the needle and comprising means selectively implemented to oppose upward displacement of the rating mass relative to the valve body under the effect of pressure applied to the needle via the seat.

Abstract: A valve assembly having a first condition for blocking system fluid flow when system fluid pressure differential across the valve assembly is in a given range above a predetermined pressure differential and a second condition for permitting system fluid flow in one direction when system fluid pressure differential across the valve assembly is greater than the predetermined pressure. The valve comprises a valve housing, a valving member within the housing, a solenoid assembly, first and second springs for exerting force on the valving member and a solenoid energizing circuit. The valve housing defines a fluid flow inlet, a fluid flow outlet and supports a valve seat between the inlet and outlet. The valving member comprises a valving element positioned for engagement with the valve seat and a stem element fixed to and projecting from the valving element.

Abstract: The annular valve (10) comprises a valve seat (11) attached in the housing (1) of the compressor, an absorber (14) attached thereto at a distance and an annular sealing component (12), which can move between the valve seat and the absorber. Helical springs (2), which move the sealing component in the closing direction towards the valve seat, are distributed over its periphery between the absorber and the sealing component. Each helical spring (2) is fastened with one end in the absorber (14). In the region of the other end of each helical spring (2), the sealing component (12) is provided with guide means (6) for the respective spring end.

Abstract: An electronic pressure relief system for a traction slip control vehicle brake system maintains the pressure within the brake system at its desirable level by electronically controlling an isolation valve coupled to the brake conduit. The isolation valve is controlled by supplying an energizing current to the valve at a preselected level such that the holding pressure exerted by the valve is maintained at a level approximately equal to the maximum desired pressure level to be maintained within the brake conduit during the traction slip control maneuver.

Abstract: A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block assembly, containing a plurality of reciprocating pistons within compression chambers, is covered by cylinder heads. The compression chambers include a discharge valve which permits compressed refrigerant to empty into a common discharge chamber. A pressure relief mechanism, formed by cylinder heads yieldably attached to the crankcase, is included within the compressor to eliminate damage caused by high pressure conditions such as slugging. Alternatively, pressure relief may be created in the common discharge chamber by a yieldably attached cage bearing or a valved port.

Abstract: An implantable drainage valve for the treatment of hydrocephalus is described. The valve includes a body, a valve seat, a closure member, a spring and at least one spherical weight. The spring is positioned within the cylindrical chamber of the valve body and between the closure member and the spherical weight. The valve is intended to be vertically oriented when the patient is sitting or standing and, when so oriented, the weight will provide additional compressive force against the spring to help maintain the valve in a closed condition. Consequently, hyperdrainage is avoided when the valve experiences normal variations in fluid pressure differentials such as when the patient rises from a lying or recumbent position to a standing position.

Abstract: A control valve responsive to vehicle speed to vary hydraulic pressure in a vehicle variable assist power steering system. The control valve includes a proportional solenoid which responds to a control signal to vary the pressure difference between the valve inlet and outlet. The flow of hydraulic fluid through the valve generates a momentum force against a solenoid moveable valve element. This momentum force is balanced by an opposing bias spring force such that changes in inlet pressure occur simultaneously with changes in the control signal. The solenoid includes an adjustable air gap which allows calibration of the pressure difference across the valve to match a predetermined solenoid current.

Abstract: A valve system for use with a tube jetting apparatus used for cleaning the interior surfaces of tubes such as those in heat exchangers. The apparatus includes a piston housing having a piston assembly slidably disposed therein. The pressure relief assembly also includes a differential pressure relief valve which is connected to the piston housing to relieve pressure therein as the piston moves within the housing.

Abstract: A solenoid valve for hydraulic brake units with slip control is described which has a magnetic armature (2) surrounded by a valve dome (14), the magnetic armature (2) positioned by energization of a magnet coil (16) , so that a valve needle (1) which is carried by the magnetic armature (2) is moved onto a valve seat (3). A hydraulic actuating force is generated by an arrangement causing the valve needle (1) to open even through the solenoid valve is energized causing the valve to act as a pressure relief or limiter valve.

Abstract: A pressure release apparatus for relieving pressure that may occur within a pipeline due to water hammers or the like. This apparatus is secured to the pipeline directly in line with the pressure wave and consists of a spool piece having an opening therethrough which is selectively biased in the closed position. When pressure within the pipeline is sufficient to overcome this bias, the opening is unblocked thereby permitting such pressure to be released to the atmosphere. A blast shield surrounds this opening so that the sudden release of such pressure will not cause damage to surrounding people or property.

Abstract: A hydraulic brake system for a vehicle includes a cutoff valve for isolating a hydraulic modulator for anti lock brake control and traction control, from a brake master cylinder. This cutoff valve is so arranged that the master cylinder fluid pressure forces the cutoff valve to its open state even if the valve is stuck in its closed state by a failure of the system.

Abstract: A variable pressure control valve arranged to enable a pilot piston having a comparatively small diameter to be used thereby making the whole body of the valve compact. This variable pressure control valve comprises a spool (2) kept in pressure contact with the valve seat of a pressurized fluid inlet port (1) by the resilient force of a compression spring (3); a stationary valve shoe (5) fixed so as to support the base end of the compression spring; and an auxiliary compression spring (6) which urges the spool (2) to the side of the valve seat on one side thereof and is urged by a pilot piston (4) on the other side thereof.

Abstract: A proportional pressure release valve comprising a valve body incorporating a valve seat, a valve closure member mounted in the valve body and cooperable with the valve seat to control flow of fluid through the valve from an inlet pressure port to an outlet tank port, and electromagnetic control means having a push pin operable to move, via resilient means, the valve closure member in dependence upon the magnitude of a control current applied thereto, wherein the valve further comprises damper means provided between the push pin and the valve closure member. The valve may also comprise an anti-cavitation ring having a bore and disposed downstream of the valve seat, the anti-cavitation ring being apertured to provide a fluid connection between the ring core and the tank port. The valve closure member may be guided for movement towards and away from the valve seat by guide means comprising at least one linear bearing.

Abstract: A constant flow valve comprises a valve body (5) having an inlet passage (2), an outlet passage (3), and a hollow chamber (4) disposed between the passages and inclined with respect to the inlet passage at a certain angle; an opening (7) for connecting the outlet passage with the hollow chamber, an inner circumferential face of the opening being tapered from an upstream side toward a downstream side; a lid body (17) fitted to the valve body; a spindle (9) supported by the lid body and movable back and forth along the axis of the opening; a cylinder (10) integrally arranged at a lower end of the spindle; a valve shaft (12) freely arranged inside the cylinder and positioned substantially on the axis of the opening; a valve plug (13) fitted to a front end of the valve shaft to create an orifice between itself and the opening; and springs (14, 15) disposed inside the cylinder to force the valve plug away from the opening.

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 moisture-responsive valve includes a water-swellable body within a housing adjacent a moisture-permeable wall thereof for controlling the movements of a valve member with respect to a valve seat in response to the moisture passing through the moisture-permeable wall. The valve member is floatingly mounted between a first spring interposed between the valve member and the housing and urging the valve member away from the valve seat, and a second spring interposed between the valve member and the water-swellable body and urging the valve member towards the valve seat.

Abstract: A pressure relief or rollover valve is utilized on the tank of a fuel delivery truck to vent or relieve an abnormal internal pressure within the tank, such as that generated by an accidental deformation of the tank wall, while preventing spillage of fuel during the venting. A tubular valve housing is mounted in the top of the tank with a cover at the exterior of the tank releasably locked in sealed engagement with the upper end of a passage through the housing which opens at its lower end into the tank interior. A valve plate within the housing is biased downwardly to a valve closed position against an upwardly facing valve seat in the passage by springs engaged between the closed cover and the valve plate. A flexible bladder is sealed to the bottom of the cover to define an air chamber sealed from the passage, and openings through the cover vent this air chamber to atmosphere. A shield plate rests on the top of the cover to overlie the vent openings.

Abstract: A pressure responsive valve assembly for a sterilization container having a valve opening comprises a valve closure member for closing the opening and a fluid tight plenum chamber including a rigid wall and an opposite movable wall connected to the valve closure member for movement along a common axis therewith. A spring biases the movable wall and valve closure member away from the rigid wall of the plenum chamber. The movable wall has an area comparable to that of the valve closure member and the plenum chamber has a relatively small length-to-diameter ratio so that when the valve closure member is moved to open or close the valve, the resulting movement of the chamber movable wall changes the volume of the plenum chamber by less than 20%.

Abstract: A hydraulic pressure-control device, specially for powershift transmissions of motor vehicles, comprises a fluid pump (1) and a main valve for regulating the pressure in at least one high-pressure consumer device (6), which is attached to a pressure pipe (3) between the fluid pump (1) and the main pressure valve. The main pressure valve is designed as pressure-relief valve. In the main pressure valve is integrated the operation of a second pressure-relief valve. Two different pressure limits can be adjusted in the pressure pipe (3) by a valve piston (21) through two compression springs (17, 18) connected in parallel of which one compression spring (18) is bound.

Abstract: A first nozzle is connected to a space to be protected from excess pressure. A valve member releaseably seals the first nozzle. A second nozzle is coupled to an adjustable vacuum source for applying a predetermined vacuum level to the valve member to create a force against the member to seal the first nozzle. Seals are between the first and second nozzles and the member which couple the nozzles when the member disengages from the seals. The member disengages from the seals when the force on the member imposed by gas in the space being protected exceeds the force on the member created by the difference between ambient atmospheric pressure and the vacuum source pressure.

Abstract: An overfill protecting arrangement for a liquid storage tank comprises in combination a venting valve and a spill valve. The arrangement is designed for a maximum permissible loading rate, and the venting valve is so dimensioned that at this loading rate the tank pressure will assume an equivalent value substantially lower than a safety limit value prescribed by the authorities. The spill valve is a quick-opening valve, preferably a magnetic value, which has an opening pressure distinctly higher than said equivalent value of the tank pressure and lower than said safety limit value. The drops of pressure caused by a flow of liquid at the loading rate into the venting valve system and out of the fully open spill valve are so co-ordinated that flow of gas out of the spill valve and flow of liquid out of the venting valve cannot occur at any circumstances.

Abstract: The present invention relates to relief valves, and is drawn to a relief valve that alleviates the rise in the relief pressure, by the compression of a main spring via a moving spring receiving member, due to the introduction of hydraulic pressure at the supply side into a fluid chamber at the rear of a movable spring member. Moreover, an adjustment spring to urge the moving body and to assist the main spring is provided within a fluid chamber, and the urging force of this adjustment spring can be adjusted by the operation of a changing member provided externally of the valve. Thus, the set pressure of the relief valve can be easily and readily changed, and also a fine adjustment of the set pressure can be effected.

Abstract: A hydraulic shock-absorber and vibration damper comprising a cylinder (1), a damping piston (2) disposed so as to be axially movable inside the cylinder (1) and dividing off two working chambers (9, 10) filled with a hydraulic damping medium and connected by at least one throttle means (62), a piston rod (3) connected to the damping piston (2) and guided in sealing-tight manner out of the cylinder (1), and a compensating chamber (11) connected to one (9) of the working chambers (9, 10) for receiving a volume of damping medium displaced by the piston rod (3). A damping valve (26) driven by an electromagnet (24) and acted upon by a closing force is disposed at the transition between the working chamber (9) and the compensating chamber (11). The damping valve (26) is disposed in series with the throttle means (62), so that all the damping medium flowing between the working chamber (9) and the compensating chamber (11) flows through the damping valve (26).

Abstract: The problem of controlling overspeed and/or oscillation of a variable displacement hydromechanical actuation system is solved by a multi-stage flow regulating valve (18) which includes a valve body (20, 22) having a fluid inlet (24) and a fluid outlet (26) defining a flow path (A,B) through the valve body. A first stage valve piston (30) is reciprocally mounted within a cylinder (28) in the valve body (20) in the flow path between the inlet and the outlet for restricting fluid flow in response to a first range of incoming fluid pressure. The first stage piston (30) has an inlet orifice (34) exposed to the incoming fluid and an outlet port (36) in registry with the outlet (26) of the valve body (20). A second stage valve piston (44) is reciprocally mounted within the first stage piston (30) and has an orifice plate (46) for covering the inlet orifice (34) of the first stage valve piston (30). The orifice plate has smaller orifices (48) for further restricting fluid flow through the valve body.

Abstract: An oil relief valve for lubrication systems for internal combustion engines comprising a valve body having a hollow cylindrical shape, a valve seat provided at a bottom end of the valve body, a valve plug placed in the seat, a port bored in the seat to bring the oil relief valve into fluid communication with a lubrication line which supplies oil from an oil pump to various engine parts to be lubricated, a spring mounted on top of the valve plug and adapted to urge the plug against the seat to close the port, and slits cut in the valve body and provided to bring the valve in fluid communication with an oil pan. The spring has a free length smaller than the distance of the space defined between the valve plug and the top end of the valve body.

Abstract: A jet spray atmospheric deaerator unit having a vessel divided into an atmospheric section and a low pressure section, the low pressure section containing a jet spray deaerator valve connected to a steam supply line arranged with a water collection tray for deaerating water dispensed from the tray, the collection tray receiving water from the atmospheric section through a water circulating line which sprays water over the tray to purge steam from an open gas vent line communicating between the low pressure section and the atmospheric section, the atmospheric section having a vent open to atmosphere with a vent condenser to purge vented non-condensible gases from the atmospheric section, and, the low pressure section being pressure protected by a water column conduit communicating between the vessel sections to return overflow water and blow through excess pressurized gas.

Abstract: To adapt a compressor valve to varying operational conditions of the compressor, particularly to varying numbers of revolutions and/or the respective specific weight of the transported gas, a process and a compressor valve for executing the process are provided. The process is that a compressor drive at various numbers of revolutions or transporting gas with varying specific weight, the spring force--possibly resulting from several spring forces--acting during operation on the plug in a closing direction and/or the lift of the plug is forcefully reduced with falling number of revolutions or increasing specific weight the process is reversed either continuously or in steps.

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: The valve, depicted as of the plate-type, has a ported valve seat, stop plate, and valving element (movable between the plate and seat) biased toward the seat by compression springs. Eight sets of compression springs are employed, in the disclosed embodiment, and each set comprises a pair of helical, counterwound (compression) springs concentrically nested together.

Abstract: A fluid power control valve apparatus is disclosed and is characterized by combining desirable features of both a spool type valve element and a poppet type valve element. A spool element is provided with one end adapted to be seated in a poppet valve seat provided in the bore in which the spool is slideably mounted. The poppet seat is located in the bore between two flow ports. The poppet end of the spool engages and becomes fully seated only after the spool has passed a bore position closing one of the ports to operative flow and operates to seal the bore from the conventional leakage flow associated with spool elements. Also disclosed is a method of manufacturing such an apparatus in a two piece assembly to greatly simplify manufacture of a precise poppet seat within the spool bore.

Abstract: A pressure control valve is disclosed including a housing, a valve seat, a valve closure member in the form of a ball loaded by a valve spring in a closing direction and controlling the communication between an inlet and an outlet of a pressure medium. So as to provide a pressure control valve which is simple in construction and low-cost manufacture and which is characterized by minimal noise formation a spring loaded guide element at least partially surrounds the valve closure member and axially and radially guides the valve ball, acted upon by a second spring.

Abstract: A fluid pressure control valve and a fluid control system (such as for beverage dispensing) with such a valve has a beverage passage 3, pressure fluctuations in which are detected by a diaphragm 17 to displace a sensing member 15 axially against spring loading 23. Spring 23 reacts on thrust member 22 which is adjustable axially through a cam mechanism 25/26 to vary the biasing force of spring 23. A valve member 20 spring loaded at 21 relative to thrust member 15 normally closes an exhaust port 19 to an air or other gas passage 5 through which gas passes under pressure to be injected into the beverage from passage 3. An increase in beverage pressure in passage 3 displaces sensing member 15 to increase the spring biasing 21 on the closure member 20 and reduce the proportion of air which can escape to atmosphere from passage 5 through exhaust port 19 to provide an increase in air flow into the beverage.

Abstract: A closure device for shelters and the like. The frame (1) of the closure device is provided with at least one flow-through passage (2); a closure (3) is mounted displaceably in each passage; and a counter part is formed in the frame for each closure. The closure is displaceable between an open position, which permits a normal air flow, and a closed position, which may be caused by a pressure shock, in which the closure means is pressed against the counter part so as to close the respective passage. The objective is to provide a simple and steady structure, the operation of which is as efficient as possible. Accordingly, the passage (2) is defined by substantially U-shaped elements/partial elements (5a, 5b) which open towards each other in the direction of flow.

Abstract: A device capable of functioning as a fluid pump or motor has a related hydraulic circuit controlling the relationship of the case pressure to the pressure in high-pressure port. The arrangement thus limits the operating pressure effective on the seal system. The preferred form incorporates the hydraulic circuit within the body of the device.