Abstract: A temperature sensitive relief valve for a reservoir of a hot fluid including a cold fluid inlet in communication with a cold fluid outlet via a main cold fluid feed arrangement; a fluid mixing chamber having an outlet; a hot fluid inlet adapted for attachment to the reservoir of hot fluid and in communication with the fluid mixing chamber; a secondary cold fluid feed arrangement in communication with the fluid mixing chamber; and a valve arrangement responsive to the temperature of the hot fluid in the reservoir so that, when the temperature of the hot fluid is below a pre-determined value, the valve arrangement is in a first configuration which prevents hot fluid and cold fluid from entering the fluid mixing chamber and, when the temperature of the hot fluid exceeds the pre-determined value, the valve arrangement adopts a second configuration which allows hot fluid and cold fluid to enter the fluid mixing chamber, thereafter to flow out of the outlet of the fluid mixing chamber as a mixed fluid having a tem

Abstract: A solenoid valve including a spool received within a housing. The spool is configured to move to multiple positions within the housing. The housing includes supply ports, exhaust ports, and outlet ports. When the spool is in a specific location, two outlet ports are in fluid communication with each other.

Abstract: A hose bend bleeder is combined with first and second hoses, with the hose bend bleeder being located at the bottom of a bend in a flow path established by the hoses. The hose bend bleeder has a bleed screw and a downwardly facing exit passageway.

Abstract: A system and method for closed-loop testing of a biological or chemical sensor is disclosed. The tester is fluidically coupled to the input port and exhaust port of a sensor. A mixture of a chemical or biological simulant and air is generated by the tester and is delivered to the sensor. The mixture of simulant and air exiting the sensor is delivered to a collection device.

Abstract: The invention concerns a hydraulic valve arrangement (1) with several valve modules (2-6), each having a supply channel arrangement with a high-pressure channel (7) and a low-pressure channel (8), a working connection arrangement with at least one working connection (A, B), a directional valve arrangement (15, 16) between the supply channel arrangement and the working connection arrangement and a compensation arrangement (19, 28). It is endeavoured to improve the control possibilities. For this purpose, it is provided that in at least one valve module (3, 5) the compensation arrangement is a pre-compensation arrangement (19) and in at least one other valve module (4, 6) the compensation arrangement is a post-compensation arrangement (28).

Abstract: A valve assembly may include a main housing and first and second electro-statically actuated valves. The main housing may define at least three chambers, with a first chamber configured to be coupled to a high pressure supply port, a second chamber configured to be coupled to an output port, and a third chamber configured to be coupled to a low pressure exhaust port. The first electro-statically actuated valve may be provided between the first and second chambers, and the first electro-statically actuated valve may allow or substantially block fluid communication between the first chamber and the second chamber responsive to a first electrical signal. The second electro-statically actuated valve may be provided between the second and third chambers, and the second electro-statically actuated valve may allow or substantially block fluid communication between the second chamber and the third chamber responsive to a second electrical signal. Related methods are also discussed.

Abstract: A pair of supply/drain pipes (Y and Z) continuous with an actuator (2) are respectively communicable with a pair of oil sumps (A, B, C) and (F, G, H) each other respectively through an intermediation of a pair of extended paths (a and b), the pair of oil sumps (A, B, C) and (F, G, H) being formed in a switch-spool insertion hole (7) and entering a neutral state or a state of being selectively communicated with any one of respective pressure-oil paths (S and V) and respective oil-return paths (Q and W). A non-leak valve (12) is provided over respective connection portions (I and J) and (K and L) between the pair of supply/drain pipes (Y and Z) and the pair of extended paths (a and b), the non-leak valve (12) being opened when an operation of a pump (P) is started, being maintained to be opened during the operation of the pump (P), and being closed when the pump (P) is out of operation.

Abstract: This invention relates to microfluidic devices including a manifold arrangement (1) with a terminal output channel (5) and a via (6) for connecting the terminal output (5) to the extreme end (11) of the manifold (1). The via (6) and channel (5) together form a bleed outlet. The shape of the via is such that it will always overlap the extreme end of the manifold, irrespective of the expected variability in via to manifold alignment. Preferably the manifold has a generally rectangular cross-section.

Abstract: A valve mechanism includes a rigid body structure through which various channel structures are configured. A valve actuation mechanism is coupled to the rigid body structure. The valve mechanism is actuated to move a plunger within a fluid pathway, thereby opening the fluid pathway through the valve mechanism. An actuation element is actuated by the valve actuation mechanism and either directly or indirectly releases a retaining force holding the plunger in closed position. The pressure from the input fluid flow is sufficient to move the plunger once the retaining force is removed, thereby opening the valve mechanism. The valve mechanism can be configured as a single-use device, where the valve mechanism is initially closed and when actuated, is open. Once open, the valve mechanism remains open, even when the valve actuation mechanism is disengaged.

Abstract: A fluid isolation valve having a valve body with a first fluid flow port, a second fluid flow port and a fluid drain port with a valve in the fluid drain port. The valve body also defines a fluid flow channel, a drain flow channel and a valve portion, wherein the valve portion is disposed in the valve body to be communicated with the first fluid flow port, the second fluid flow port and the fluid drain port. A flow diversion device is also provided and is disposed within the valve portion. The flow diversion device is configurable between a first configuration and a second configuration, such that when the flow diversion device is in the first configuration the first fluid flow port is communicated with the second fluid flow port. Consequently, when the flow diversion device is in the second configuration the first fluid flow port is communicated with the fluid drain port. The fluid flow can be decrease or stop by use of the valve within the fluid drain port.

Abstract: A fuel cell coupler includes a socket section (4) which has a socket body (32) set in a fuel cell and a valve mechanism disposed within the socket body, and to which a nozzle section (8) attached to a fuel cartridge is detachably connected. The socket section (4) is provided with a nozzle holding mechanism (43) which has a hook portion (44) protruded inward of the socket body (32) and can retract toward the outside of the socket body (32), and an elastic member (45) which applies a pressing force to the hook portion (4) to hold the nozzle section (8) and allows the hook portion (44) to retract.

Abstract: A fluid handling structure is disclosed which is designed for all wet immersion lithography. The fluid handling structure has a first opening to provide fluid to a space between a final element of a projection system and a substrate and/or substrate table, a barrier to resist the flow of liquid out of the space between the fluid handling structure and the substrate, and a second opening, which opens into an area radially outwardly of the space, to provide a flow of fluid from the fluid handling structure onto a top surface of the substrate and/or substrate table radially outwardly of the space. A controller may be provided such that flow of fluid towards a center of the substrate table is greater than the flow of fluid in a direction away from the center of the substrate table.

Abstract: The invention relates to a regulating valve, which is attachable, in particular in a bore of a hydraulic door closer, executed with a female thread. The regulating valve has a body, adjoined by a regulating area, and a thread provided with an anti-rotation means. The thread with the anti-rotation element can be screwed into the female thread of the bore of the hydraulic door closer. In order to provide a regulating valve with a simple design while excluding unwanted adjustment of the regulating valve during the operation, the anti-rotation means includes a raised area, which can cooperate with the bore or the female thread of the door closer.

Abstract: Microfluidic shunt valves are disclosed having a deflectable element capable of being held in a closed position to occlude the passage of fluid between an inlet and outlet and, when not held in the closed position, the deflectable element is adapted to oscillate in response to fluid pressure pulses and thereby facilitate fluid passage through the valve. Controls for activating the deflectable element to permit fluid passage are also included.

Abstract: Embodiments of the invention relate to a substrate etching system and process. In one embodiment, a method may include depositing material on the substrate during a deposition process, etching a first layer of the substrate during a first etch process, and etching a second layer of the substrate during a second etch process, wherein a first bias power is applied to the substrate during the first process, and wherein a second bias power is applied to the substrate during the second etch process. In another embodiment, a system may include a gas delivery system containing a first gas panel for supplying a first gas to a chamber, a second gas panel for supplying a second gas to the chamber, and a plurality of flow controllers for directing the gases to the chamber to facilitate rapid gas transitioning between the gases to and from the chamber and the panels.

Abstract: The present application relates to valve and actuator assemblies. The valve actuator assemblies may include a capless valve actuating arrangement, include a replaceable passage defining member that includes seal members, include a valve member that is assembled in a valve chamber from an end of the valve body that is opposite an end that a piston is assembled in, and/or include a valve member that may be rotated in a valve body without affecting the ability of the valve member to perform its sealing functions.

Abstract: A hydraulic control apparatus 1 includes a switch valve 11, a valve support chamber 35, a flow control valve 12 movable within the valve support chamber 35, an on-off valve 13 movable within the communication path chamber 12a, and a valve control device 14. The flow control valve 12 has a communication path chamber 12a and a back pressure chamber 12d. The on-off valve 13 is capable of opening and shutting off a communication path X between a cylinder line 32 and a switch valve line 33. A restrictor is formed between the flow control valve 12 and a wall defining the valve support chamber 35. The restrictor connects the cylinder line 32 and the communication path chamber 12a to each other. The opening degree of the restrictor is changed in correspondence with movement of the flow control valve 12.

Abstract: A pressure relief device for an air inflator includes a pipe connector, a seal member, a check valve mounting ring, a check valve, an air cell connector, and a pressure relief control ring. Thus, the pressure relief control ring is tightened to perform the air inflating action and loosened to perform the pressure relief action, so that the air inflating action and the pressure relief action are performed along the same axis, and the pressure relief device has a co-axial operation function, thereby facilitating the user inflating and deflating the inflatable body. In addition, the air inlet hole is not mounted in the air cell to facilitate the user compressing the air cell.

Abstract: A multifunctional fluid shut-off device including an upstream shut-off element, a flow-rate limiter, and a downstream functional element. The upstream shut-off element presents a body in which at least one valve is disposed, and a downstream end includes an exit port to which the downstream functional element is operatively connected. At least one of the upstream shut-off element and the downstream functional element includes a retention mechanism for the flow-rate limiter. A unit including the downstream functional element is directly connected to the upstream shut-off element containing in its interior the flow-rate limiter.

Abstract: A valve is provided with a valve housing encompassing a pressure chamber and possessing at least two valve ports which open into the pressure chamber, whereby, in the pressure chamber at least one axially slidable valve stem exists, which controls at least one of the valve ports and which the at least one valve stem is movable between a closed position and an open position. The valve further encompasses at least one wire or band shaped SMA element, the element having an SMA, as well as possessing a resetting element for the movement of the valve stems into the closure direction. The valve seat carries on its first end a port closing closure disk, whereby its second end is axially guided within the pressure chamber on a base plate which the plate extends itself transversely to the valve stems.

Abstract: A pressure-compensating directional control valve, for actuating hydraulic actuators, comprising at least one modular valve body, with one through receptacle for a slidable shuttle, a driving fluid delivery port connected to a pump, a discharge fluid port, a first output opening and a second output opening, connected to the first and second chamber, of a hydraulic actuator, at least one bridge for selective communication, by way of the shuttle, of the delivery port with the first or second chambers of the actuator, for actuation thereof, a unidirectional hydrostat connected to the bridge to draw selectively a pressure signal of the load of the actuator, the signal for adjusting selectively the delivery pressure of the pump so as to keep substantially constant the pressure drop between the delivery port and the actuator in any load condition.

Abstract: An apparatus is provided for sealing of a damaged inflatable article, the apparatus including a container (1) for a sealant compound or composition, the container including at least one inlet means (4) which is releasably attachable to a source of pressurised air/gas, an extraction assembly (10 associated with the container (1), the extraction assembly (10 including an extraction unit having at least one outlet means (18) to be releasably coupled with or connected to the article and means (30) to be disposed within the container (1) and actuatable, upon supply of pressurised air/fluid/gas to the =container (1) to allow for controlled dispensing of the sealant compound or composition from the container (1) via the extraction unit (10) to the article to be sealed.

Abstract: A pump assembly includes a housing and first and second valves. The housing has a fluid inlet port and a fluid outlet port. The first and second valves are substantially identical valves both including a mounting portion, a valve seat and a valve body. The mounting portion has a first end and a second opposite end. The first and second ends are both selectively mountable to a conduit defining a fluid path. The valve seat is interconnected to the mounting portion. The valve body is interconnected to at least one of the mounting portion and the valve seat for movement relative to the valve seat between a seated position and a closed position. The valve body includes a first side and a second side and is operative to seal against back flow from the first side and open to positive pressures on the second side. The first valve is mounted to the fluid inlet port with the first end such that the first valve normally functions to only permit fluid to flow into the housing.

Abstract: An on-off controller, according to various aspects of the present invention, for controlling a pressurized fluid from a provided bottle, the bottle having a poppet valve biased in a closed position, wherein the pressurized fluid flows from the bottle when the poppet valve is open, the on-off controller includes a body, a seal, a rod, and a position mechanism. The body having a cavity, an inlet, an outlet, and a vent, the inlet and the outlet having continuous fluid communication with the cavity, the vent having sealable fluid communication with the cavity. The seal having a seal bore therethrough, the seal for sealing the vent. The rod having a first bore and a second bore, the first bore in continuous fluid communication with the second bore, the rod positioned in the seal bore.

Abstract: A solenoid-operated valve has an exhaust seat (42) through which fluid can flow to an exhaust port (32) of the valve. Fluid can also flow through a control/supply seat (46) from a supply port (30) of the valve to a control port (28) of the valve. An axially rigid assembly includes first and second ball (40, 48) distanced from each other but connected such that pressure against one ball that is sufficient to cause it to move always moves the other ball. The exhaust seat (42) is blocked by the first ball (40) when the control/supply seat (46) is not blocked, and the control/supply seat (46) is blocked by the second ball (48) when the exhaust seat (42) is not blocked.

Abstract: Disclosed is an infinitely variable directional valve comprising a seat slide on which a valve cone is formed which is prestressed counter to a valve seat in the initial position of the directional valve. The directional valve is configured with a pilot control device wherefore a pilot control valve seat which interacts with a pilot control valve cone is provided inside the closing cone.

Abstract: A pneumatic system for a surgical machine includes a reservoir, first and second proportional valves, and a controller. The reservoir holds pressurized gas. The first proportional valve is located on an input side of the reservoir and allows a variable amount of pressurized gas to enter the reservoir. The second proportional valve is located on an output side of the reservoir and allows a second variable amount of pressurized gas to exit the reservoir. The controller controls the operation of the first and second proportional valves. The controller adjusts the first and second proportional valves so that a constant gas pressure range is maintained at an output of the reservoir over a first range of input gas pressures and a second range of gas usage.

Abstract: Disclosed is a durable fluid manifold easy to handle and whose members for forming channels are thin and circuit volume is relatively small. The fluid manifold includes an admission-side base with fluid admission ports and an exhaust-side base with fluid exhaust ports. The fluid manifold additionally includes a flexible member made of a plurality of resin films bonded together by application of heat and pressure without using an adhesive. The flexible member is bonded on the upper surface of the bases and to form the fluid manifold, in which pumps and valves are mounted on the admission-side base via the flexible member. Formed within the flexible member are fluid channels placed in communication with the admission ports and the exhaust ports and coupled to the pumps and the valves.

Abstract: An on-off controller, according to various aspects of the present invention, for controlling a pressurized fluid from a provided bottle, the bottle having a poppet valve biased in a closed position, wherein the pressurized fluid flows from the bottle when the poppet valve is open, the on-off controller includes a body, a seal, a rod, and a position mechanism. The body having a cavity, an inlet, an outlet, and a vent, the inlet and the outlet having continuous fluid communication with the cavity, the vent having sealable fluid communication with the cavity. The seal having a bore therethrough, the seal for sealing the vent. The a rod having a first end portion, a second end portion, and a middle portion between the first end portion and the second end portion, the middle portion having a groove therein, the rod positioned in the bore.

Abstract: A device for controlling a paper cutting machine which has a press-down bar and a cutting bar, wherein the press-down bar is operable by a spring-biased single-side action hydraulic press cylinder and the cutting bar is operable by a rotary motor which is adapted to be coupled to a cutting bar via a gearcase and a friction clutch, and wherein the friction clutch is operable by a hydraulic coupling cylinder biased by a spring, comprising a hydraulic pressure source which is connected to the press cylinder via a first pressure line and a controllable on-off valve, two parallel controllable circulation valves which are connected to the pressure line and join the pressure line to the tank when at rest, a controllable cutting simulator valve assembly which restricts the pressure from the press cylinder and the volume of hydraulic medium flowing thereto, a second pressure line leading to the coupling cylinder and joined to the first hydraulic pressure source or a separate second hydraulic pressure source, two contr

Abstract: An adsorbent fractionator directional flow control valve assembly includes two inlet valves, two exhaust valves, and a valve body. The valve assembly controls the directional flow of an influent gas mixture into one of two vertical desiccant tanks of an adsorbent fractionator, or desiccant dryer, and an effluent gas flowing in reverse through the opposite desiccant tank. The valve body is a single unitary piece, which may be a casting, and couples the inlet valves and the exhaust valves, which may be four identical valve subassemblies, providing flow communication between these and an inlet port, two exit ports, and an exhaust port.

Abstract: The invention relates to the field of hydraulic directional control valves and refers to an anti-saturation directional control valve (V) composed of two or more sections in each of whom there is a pressure selector compensator with a six-way two-position spool (4) of the proportional type and a compensator (3) performing the function of pressure compensator. The pressure compensator (3) comprises therein a pressure signal selector (S), that is mechanically kept open or not by a piston (5) with a spring (M), of a negligible force, depending on workport pressures. The piston (5) presses against the pressure compensator (3) in the section (E) of the directional control valve (V) that is at a higher pressure, in this case operating as check valve, while in the sections at lower pressure the piston (5) is kept detached from the pressure compensator (3) so that this latter one performs its function of pressure compensator and the inner signal selector (S) by means of the sphere action.

Abstract: A digital pressurization compound terminal 10 comprising a high accuracy digital pressure gauge 11 sheltered in a silicon housing, main body 13 made of a high-resistance allow and dimensioned to be held in the palm of the user's hand, o-ring 12, control or HP valves 14, ring 15, regulator assembly valve 16, equipped piston 17, second o-ring 18, inferior body and handle 19, third o-ring 20, male quick coupling 21, screw 22, regulator setting wheel 23, purging female quick coupling 24, service female quik coupling 25 and on-off switch 26.

Abstract: A valve assembly for an air pressure system includes an inlet valve, a first control valve, and a second control valve. The inlet valve includes an inlet port, an outlet port and a control port. The inlet valve inlet port communicates with the inlet valve outlet port when the inlet valve control port is above a threshold pressure. The first control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The first control valve inlet port communicates with the inlet valve outlet port. The first control valve outlet port communicates with one of the first control valve inlet port and the first control valve exhaust port as a function of a position of the first control valve control member. The second control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The second control valve inlet port communicates with the inlet valve outlet port.

Abstract: The object of the present invention is to provide a simple-construction four-way switching valve which is simple in construction and excellent in sealability, performs switching of the operation mode without producing unusual noise, and is reduced in the number of manufacturing steps through elimination of externally-mounted parts for pressure passages. Main valves having a poppet valve structure constitute a three way switching valve which is operated by a pilot valve, for switching the high-pressure refrigerant introduced into the port T1 to the port T2 or to the port T3, and main valves which have a poppet valve structure and are switched by the differential pressure between the ports T2 and T3 constitute a low-pressure three-way switching valve. This makes it possible to improve the sealability, prevent unusual noise from being generated during switching of the operation mode, and simplify the construction.

Abstract: A spool valve section for a multiple valve assembly has a body with two opposing side surfaces. A plurality of mating surfaces are raised from each side surface. The mating surfaces surround the openings of fluid passages through the section and apertures for fasteners that secure the assembly together. The mating surfaces are spaced from a region of each side surface that is adjacent a bore in the body that receives a control spool. The fluid passages also are spaced from and do not intersect the spool bore. These characteristics of the spool valve section reduce distortion of the spool bore which could otherwise result from the pressure and fastening forces in the valve assembly.

Abstract: A valve assembly for an air pressure system includes an inlet valve, a first control valve, and a second control valve. The inlet valve includes an inlet port, an outlet port and a control port. The inlet valve inlet port communicates with the inlet valve outlet port when the inlet valve control port is above a threshold pressure. The first control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The first control valve inlet port communicates with the inlet valve outlet port. The first control valve outlet port communicates with one of the first control valve inlet port and the first control valve exhaust port as a function of a position of the first control valve control member. The second control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The second control valve inlet port communicates with the inlet valve outlet port.

Abstract: A pressure holding apparatus incorporates a hydraulic pressure system having an engine-driven pressure source, a pressure holding valve, and a torque-transmitting mechanism. The torque-transmitting mechanism is selectively engaged and disengaged by fluid pressure from the engine-driven pressure source during normal powertrain operation. The torque-transmitting mechanism apply chamber is pressurized with the oil by the pressure holding valve when the engine operation is discontinued.

Abstract: A digital pressurization compound terminal 10 comprising a high accuracy digital pressure gauge 11 sheltered in a silicon housing, main body 13 made of a high-resistance allow and dimensioned to be held in the palm of the user's hand, o-ring 12, control or HP valves 14, ring 15, regulator assembly valve 16, equipped piston 17, second o-ring 18, inferior body and handle 19, third o-ring 20, male quick coupling 21, screw 22, regulator setting wheel 23, purging female quick coupling 24, service female quik coupling 25 and on-off switch 26.

Abstract: A system and method for enabling rapid and controlled releasing of fluid pressure, as for deflating a tire. The system, in an embodiment thereof, enables rapid and controlled deflation of a tire to enable a vehicle to navigate in rough or unstable terrain.

Abstract: A fluid control valve includes an adjustable soft start capability and pressure indicator device. The fluid control valve isolates an input port and connects an outlet port to an exhaust port when the fluid control valve is in its closed position. A system is provided for locking the fluid control valve in the closed position. The indicator device is used to provide an indication of the pressure within the outlet port to ensure safe operation.

Abstract: A hydraulic control device (10, 90) for load pressure-independent control of a double-acting motor, in which by replacing the pressure balance regulator throttle slide valve element (68, 93) but using the same housing (13), the control device can be converted from a directional-control valve (11) with a primary individual pressure balance regulator (12) for load pressure-independent control to a directional-control valve (91) with a secondary individual pressure balance regulator (92) for an oil flow distribution in the event of undersupply. To this end, in a second longitudinal bore (41) containing the control pressure opening (68, 93), the housing (13) has three axially spaced infeeds of control pressure openings (51, 52, 53), which can be activated differently through interchangeable installation of a sealing plug (66) and a stopper (67) and, together with the respective throttle slide valve element, constitute a primary pressure balance regulator (12) or a secondary pressure balance regulator (92).

Abstract: Method and apparatus for isolating hydraulic devices in a stacked hydraulic circuit of modular design employing an isolator valve module which enables partial and/or complete isolation of components in a hydraulic system to be isolated for inspection, testing, maintenance or replacement, by selective operation of the isolator valves in the isolator valve module. The isolator valve module may be a sub-plate module supporting other modules or a plurality of stacks of modules or may be a “sandwich” type module sandwiched between a sub-plate and another module or between two sandwich-type modules.

Abstract: A directional control valve includes a pressure regulator piston configured as a hollow slide with a radial passage positioned in such a way that a connection from the internal chamber of the pressure regulator piston to a pump pressure annular channel (P) can be regulated by the radial passage and a second radial passage of a directional control valve piston. The second radial passage constitutes a control edge, which is used to regulate the connection from the internal chamber to a load sensing annular channel (LS). An annular groove, which in the neutral position forms a connection from the internal chamber to the load sensing annular channel (LS), is joined to the second radial passage. The pressure regulator is impervious to different flow forces caused by different mass fluxes and ensures that the hydraulic consumer is prevented from moving in the neutral position.

Abstract: A pneumatic switching valve (1) for systems for lifting and lowering the body of a vehicle including air suspension includes a mechanical actuation element (33) for adjusting a lifting position, a lowering position, a driving position and a stop position associated with respective positions of the vehicle. An inlet valve (11), an outlet valve (12) and a locking valve (13) each include a valve body (24), a tappet (26) and a closing spring (27). The inlet valve (11) and the outlet valve (12) are arranged in one common plane to face in opposite directions. The closing springs (27) of the inlet valve (11) and of the outlet valve (12) also serve to move the actuation element (33) from the lifting position or from the lowering position to the stop position when the operator releases the actuation element (33).

Abstract: A process for increasing or reducing the internal pressure of at least one hollow body (HK—1, HK—2, HK—3) to a specified set internal pressure. The set internal pressure is adjusted so that several pressure-increasing steps or pressure-reducing steps are conducted successively until the internal pressure deviates from the set internal pressure at most by a specified tolerance. Each of these steps brings about a pressure increase or pressure reduction the amount of which is not larger than a specified upper limit. In this way, impairments of comfort owing to the rise in pressure or the reduction in pressure are especially avoided. The actual internal pressure is only measured at the beginning of the process. In one design of the invention, this amount depends upon the volumes of the hollow bodies (HK—1, HK—2, HK—3) and a supply line (VL) as well as (in the case pressure is increased) from the pressure which a pressure generator generates.

Abstract: An option valve for controlling the operation of an option actuator added as an option is installed into each of first and second main valve blocks in each of which plural control valves, a pressure oil supply line connected to a pump and a tank line connected to a tank are incorporated, and plural types of connection blocks incorporating circuit elements to be added to the option valve are attached to the main valve blocks selectively to constitute a hydraulic valve device. According to this hydraulic valve device, it is possible to widely cope with various option attachments despite a built-in system with the option valve incorporated beforehand in the main valve blocks.

Abstract: A valve assembly for an air pressure system includes an inlet valve, a first control valve, and a second control valve. The inlet valve includes an inlet port, an outlet port and a control port. The inlet valve inlet port communicates with the inlet valve outlet port when the inlet valve control port is above a threshold pressure. The first control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The first control valve inlet port communicates with the inlet valve outlet port. The first control valve outlet port communicates with one of the first control valve inlet port and the first control valve exhaust port as a function of a position of the first control valve control member. The second control valve includes an inlet port, an outlet port, an exhaust port, and a control member. The second control valve inlet port communicates with the inlet valve outlet port.

Abstract: A vehicle leveling valve for flowing pressured air to an airbag when its height falls below a predetermined height at the bottom of a height range, and for flowing air out of the airbag when its height rises above the top of the height range, which enables easy adjustment. A main valve member has a sealing surface (36) with a slot (34) therein. A disc (30) that pivots as the airbag height changes, has bores (122) that hold inserts (42, 46) with passages (40, 44). The inserts are biased against the sealing surface and have passage near ends (150) that lie adjacent to the slot ends. Each insert can pivot about a pivot axis within a disc bore (122), and each passage near end has a center (130) that is offset from the pivot axis (132a). Each insert can be pivoted about the pivot axis to shift the passage end slightly closer or further from the slot end (102) to adjust the top or bottom of the height zone.

Abstract: The invention concerns a hydraulic valve arrangement with a supply connection arrangement, which has a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, which has two working connections (A, B), which can be connected with a consumer, a directional valve and a compensation valve arranged between the directional valve and the supply connection arrangement, the pressure outlet of the compensation valve being connected with a pressure inlet of the directional valve. It is endeavoured to avoid dangerous situations, which occur because of uncontrolled pressures. For this purpose, it is ensured that the compensation valve has a relief outlet, which can be connected with the pressure outlet.