Abstract: An electric actuator has a switch, a setting unit and a resetting unit. The switch is provided in a supply path of electric power from an electricity storing body to a motor. The switch opens and closes the supply path. The setting unit is operated through receiving a supply of electric power from the electricity storing body in response to an instruction from an operator. The setting unit opens the switch provided in the supply path for electric power from the electricity storing body to the motor. The resetting unit is operated through receiving a supply of electric power from an external power supply when the external power supply has been restored from being cut off. The resetting unit closes the switching unit provided in the supply path of electric power from the electricity storing body to the motor.

Abstract: A valve assembly for an injection valve has a valve body with a central longitudinal axis and a cavity with a fluid inlet portion and a fluid outlet portion, a valve needle axially movable in the cavity, the needle preventing a fluid flow in a closing position and releasing the fluid flow via a main fluid line in further positions, a member being fixedly associated to the needle and having a surface facing the outlet portion, a first chamber embodied in the cavity, a second chamber being part of the main line, and a one-way-valve which is hydraulically arranged between the first and second chamber to prevent a fluid flow through a first fluid path in a closing position of the one-way-valve and to release a fluid flow through the first fluid path between the first and second chamber in further positions of the one-way-valve.

Abstract: A restrictor mechanism is provided in a pilot operated solenoid valve that restricts the pilot flow to the actuating piston of the valve if the pressure differences within the valve are great. This reduces the actuating forces allowing the valve to open or close softly. As the pressures within the valve start to balance, the restrictor device opens, allowing full pilot flow to hold the valve in position.

Abstract: A fluid flow control device includes a body having an inlet connection, an outlet connection, and a discharge port. A supply path extends between the inlet connection and the outlet connection and a booster module is disposed within the body. The booster module includes a control element and an actuator element and defines an exhaust path extending between the outlet connection and the discharge port. A supply port is disposed within the booster module along the supply path between the inlet connection and the outlet connection and at least a first damping means operatively connected to the booster module.

Abstract: A bypass unit for a water vapor transfer assembly includes a main body, a check valve, and an adjustable flow regulator. The main body has a conduit formed therethrough. The check valve is in communication with the conduit. The check valve normally militates against a flow of a bypass stream through the conduit and permits the flow of the bypass stream through the conduit above a threshold flow rate. The flow regulator is in communication with the conduit. The flow regulator permits an adjustment of the flow of the bypass stream to modify the water transfer rate of the water transfer assembly.

Abstract: A control valve includes a valve body with a longitudinal bore into which a first port, a second port, and a workport communicate. A valve element is slideably received within the longitudinal bore and has a valve element bore extending inwardly from one end. An aperture extends through the valve element to provide a fluid path between the workport and selectively the first port and the second port in different positions of the valve element in the longitudinal bore. A slug of solid material is received within the valve element bore and is operatively connected to transfer a force to a stationary component of the control valve without the force being applied to the valve element. This arrangement results in force due to pressure in the longitudinal bore acting on only an annular surface at the one end of the valve element.

Abstract: An electrohydraulic control valve includes a solenoid actuator that slides a valve element within a valve body to control fluid flow between a workport and each of a supply port and an exhaust port. The solenoid actuator has an armature that incorporates an element which digressively damps bidirectional motion of the armature. The element preferably damps the motion of the valve element according digressive damping velocity-force relationship.

Abstract: The invention relates to an actuator (10) for controlling a fluid flow which comprises a valve housing (11), a flow restrictor (18) and a valve seat (16), in which the flow restrictor (18) is designed such that the flow restrictor (18)—together with a closure (22) which is connected to the valve housing (12)—will form a pressure-relieving chamber (28), and as a result, a relative movement of the flow restrictor (18) and the chamber closure (22) together with the actuation will cause the volume of the pressure-relieving chamber (28) to change as a function of the direction of movement, and the flow restrictor (18) has a recess (24) which will allow the fluid to be controlled to flow into the pressure-relieving chamber (28).

Abstract: A cooling system for internal combustion engines provides directed flows of heated or cooled coolant to various engine components and/or accessories as needed. By providing directed flows, the overall coolant flow volume is reduced from that of conventional cooling systems, allowing for a smaller capacity water pump to be employed which results in a net energy savings for the engine. Further, by reducing the overall coolant flow volume, the hoses and/or galleries required for the directed flows are reduced from those of conventional cooling systems, providing a cost savings and a weight savings. Finally, by preferably employing an impellor type water pump, the expense of an electric water pump and its associated control circuitry can be avoided. The direct flows are established by a multifunction valve which, in a preferred implementation, comprises a two-plate valve wherein each plate is operated by a wax motor.

Abstract: A vandal resistant adjustable metered handle assembly for a faucet is disclosed. The handle assembly includes a body having a base adapted for attachment to a sink and a sidewall extending in an upward direction with respect to the base. The base is attached to a push button handle via a stem. A spring is associated with the body and the push button handle for metering an amount of water emitting from the faucet and a sleeve is positioned between the body and the push button handle. The sleeve cooperates with the sidewall of the body to adjust the shut-off time of the metered handle assembly. The sleeve may be color-coded to indicate water temperature. The handle assembly can be made vandal resistant by adhesively securing various components together and providing an unconventional attachment member for securing the handle assembly to a sink.

Abstract: Axial piston hydraulic pump, comprising at least one piston (2), coupled by suitable transmission means (103, 113) to drive means (3) and slidable with a reciprocating motion inside a cylinder (101), the said cylinder (101) communicating with a fluid intake passage (151) and a fluid delivery passage (161, 301), one-way means (121, 501) of controlling the flow of the fluid being provided in both passages; the said delivery passage (301) communicates, downstream of the said one-way flow control means (501), with a constricted flow discharge member (401, 411, 431, 441).

Abstract: A damping force variable valve includes a retainer having a main body connected at a central portion thereof to a high pressure part or portion of a shock absorber and having an outer peripheral region enlarging outwardly, and a spool rod integrally extending from the central portion and formed at a center thereof with a hollow portion having a spool inserted therein. The variable valve further includes a main disc disposed adjacent the retainer, a solenoid unit provided adjacent the spool rod and including a push rod for moving the spool when electrical power is applied, and an operating block installed adjacent the solenoid unit and including an enlarged portion coupled to the outer peripheral region of the main body.

Abstract: The present invention relates to a solenoid valve configured to be mounted to a shock absorber of a vehicle to adjust damping force. solenoid valve of a shock absorber in which a damping force is adjusted through adjustment of back pressure against a disc valve. The solenoid valve includes a back pressure chamber for generating back pressure against the disc valve by a fluid introduced through a back pressure adjusting flow passage, and a spool moved in a spool guide by operation of a solenoid to control opening/closing or opening rate of the back pressure adjusting flow passage. The back pressure adjusting flow passage includes a variable orifice with an opening rate of the variable orifice being adjusted by the spool and the spool guide, the back pressure chamber, and a fixed orifice formed on the disc valve.

Abstract: A hydraulic control arrangement is disclosed for the load-independent control of a consumer with a continuously adjustable distribution valve having a pressure compensator down the line. According to the invention, the pressure compensator has a single-sided damping such that the movement in the opening direction is damped and the movement in the closing direction is substantially undamped. Furthermore, a control arrangement is disclosed in which a load-holding function is integrated in the pressure compensator.

Abstract: The present invention is directed for use in a valve assembly including a housing having an axis and defining an interior, with fluid provided in the housing and substantially filling the housing interior, a valve stem disposed in the housing interior and a piston attached to the valve stem, wherein the piston and valve stem are moveable along the housing axis within the housing interior between first and second positions. The present invention includes a valve actuation control device disposed in the housing interior, the valve actuation control device allowing the fluid to freely flow from one side of the piston to the other side during at least a portion of the piston's movement between the first and second positions.

Abstract: A fuel injector has a piezoelectric or magnetostrictive actuator, which actuates a valve-closure member cooperating with a valve-seat surface a sealing seat. An hydraulic coupler includes a master piston, a slave piston, and a coupler volume formed in-between, the coupler volume being connected to a compensating chamber via a throttle. An elastic flexible section delimits the compensating chamber at least partially, and the coupler volume, the throttle, and the compensating chamber are filled with an hydraulic medium. The flexible section exerts a pressure on the hydraulic medium due to prestressing, and the force of a compression spring, which is braced either directly and/or via fixed components on the slave piston and the master piston, is directed with an initial stress in such a way that the force enlarges the coupler volume.

Abstract: A fluid regulating device includes a valve disc and a valve port adapted to provide a secondary seal during an obstructed closing operation, whereby the valve disc directly engages a housing component of the valve port to maximize the integrity of the secondary seal and advantageously reduce the size and complexity of existing valve ports. The valve port comprises a housing and a cartridge slidably disposed in the housing. The valve disc directly engages a primary seat carried by the cartridge during a normal closing operation. During an obstructed closing operation, however, the cartridge is pushed into the housing such that the valve disc directly engages a secondary seat carried by the housing at a location that is downstream of the cartridge.

Abstract: The present invention relates to the field of units for hydraulic pilot control of directional-control valves used in the fabrication of mobile vehicles and particularly relates to a hydraulic pilot control with an oscillation damping system. Connections are provided among the chambers in the pilot control unit to provide a damping effect in the actuation stroke, thereby preventing any oscillation: the provision of such connections among the chambers has the function of preventing air stagnation; this arrangement prevents any undamped behavior due to incomplete filling upon installation or to air transported in the hydraulic fluid.

Abstract: For use in a valve assembly including a housing having an axis and defining an interior, with fluid provided in the housing and substantially filling the housing interior, a valve stem disposed in the housing interior and a piston attached to the valve stem, wherein the piston and valve stem are moveable along the housing axis within the housing interior between first and second positions, a valve actuation control device is provided which is disposed in the housing interior, the valve actuation control device allowing the fluid to freely flow from one side of the piston to the other side during only a first portion of the piston's movement between the first and second positions.

Abstract: A timing lock device for a faucet includes a valve seat, a top cover, a locking washer, a relief rod, a locking valve shaft, and a compression spring. In use, the relief rod may be used to release the water pressure in the pressure storage chamber of the top cover. Then, the locking washer may be moved upward by the locking valve shaft, so that the water may flow outward. When not in use, the water may flow through the return through hole of the top cover into the pressure storage chamber. Thus, the water flow may be stopped automatically by the restoring force of the compression spring and the water pressure in the pressure storage chamber, thereby saving the manual work, and thereby achieving an excellent leakproof effect.

Abstract: A fuel injector comprising a main tubular body provided with at least one through duct that terminates in a spray nozzle adapted to atomise the fuel contained in the through duct, a shutter member moving axially in this through duct from and to a closed position in which the shutter member is disposed in abutment on the spray nozzle closing it off in such a way as to prevent any discharge of fuel, and lastly a hydraulic damper adapted to brake the shutter member during its return to the above-mentioned closed position.

Abstract: A valve (20B) is provided is provided for regulating the pressure differential between a high pressure side (16) and a low pressure side (18) of a fluid system component (14). The valve (20B) utilizes a damping washer (60) to restrict the flow of fluid from a valve bore (32) in response to translation of a valve spool (30) in the valve bore (32). The damping washer (60) includes an aperture (78) that is piloted on a valve stem (41) extending from the valve spool (30). The damping washing (60) is biased against an open end (66) of the valve bore (32) by a spring (62) engaged between the damping washer (60) and a spring seat (48) that is engaged with the valve stem (41). A separate spring (46) is provided to bias the valve spool (30) against the high pressure fluid acting on the valve spool (30).

Abstract: A metering valve assembly for use in sanitary applications and method of use is disclosed. The metering valve assembly has a relief valve hydraulically controlling a pilot valve covering a water supply inlet. The relief valve is controllably closed by a damping mechanism substantially independently of typical variations in water supply temperature and pressure.

Abstract: A control valve for a fuel injection nozzle, having a control chamber, into which a fluid conduit discharges, and a valve element, which rests on a valve seat in the control chamber, so that the fluid conduit is closed. An armature plate, which is disposed in a damping chamber and has a pressure piece that cooperates with the valve element, and an armature coil. The armature, formed by the pressure piece and the armature plate is prevented from bouncing in response to a closing motion. For that purpose, an overflow conduit is provided between the control chamber and the damping chamber.

Abstract: A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.

Abstract: A hydraulically actuated fuel injector includes an injector body that defines a high pressure passage, a low pressure passage, a control passage, a fuel inlet, and a nozzle outlet. The injector body includes upper surface and a lower surface that partially define an armature cavity. The injector body also defines a fluid displacement passage that is separated from the upper surface and the lower surface and extends between the armature cavity and a low pressure area. The fluid displacement passage is positioned and sized such that an amount of oil is always maintained in the armature cavity at least to a level below the fluid displacement passage but above the lower surface. In addition, the fluid displacement passage is sized and positioned to ensure adequate drainage for cold start, yet provide a flow restriction especially at idle conditions to produce sufficient valve damping that a substantial reduction in impact noise occurs.

Abstract: A hydraulically actuated fuel injector comprises a valve body and a stepped valve member. The valve body has a wide bore portion and a narrow bore portion. The stepped valve member has a wide member section and a narrow member section. The wide member section is slidably disposed in the wide bore portion and defines a first diametrical clearance therebetween. The narrow member section and the wide bore portion define a damping chamber therebetween that is wider than the first diametrical clearance. The stepped valve member is slidable between a first position at which the damping chamber is substantially fluidly open to a low pressure hydraulic fluid reservoir, and a second position at which a fractional portion of the narrow member section is slidably disposed within a portion of the narrow bore portion defining a second diametrical clearance therebetween that is less wide than the damping chamber and substantially restricts fluid communication between the damping chamber and the reservoir.

Abstract: A pressure balancing valve and method of assembly is disclosed. The valve includes a pressure balancer cartridge having a poppet assembly made up of releasably connectable poppet valves movably mounted on opposite sides of a diaphragm. The pressure balancer cartridge utilizes compliant members mounted on water flow controlling orifices to form a sealable opening in cooperation with the closure surface of a respective poppet. Each poppet has a reduced diameter end that fits within a damping chamber and uses a sealing member mounted on each poppet valve to increase tolerances and improve manufacturing yield. The method includes the step of aligning poppet halves and connecting the interlocking connectors of the two halves through a diaphragm.

Abstract: A control valve assembly for flushing a sanitary fixture includes a burst valve for supplying flush water flow at the beginning of a flush cycle and an independently controlled bypass valve for providing trap reseal flow after the burst valve closes. The burst valve includes a timing sleeve cooperating with a lifting piston to define a timing chamber communicating with inlet pressure through an orifice. A piston collar cooperates with the lifting piston to define the bypass valve. A lifting chamber defined between the body and the lifting piston communicates with the outlet through a metering valve assembly. Actuation of the metering valve assembly empties the lifting chamber and lifts the timing sleeve, opening the burst valve. The burst valve is closed when the timing chamber fills at a rate controlled by the orifice. The bypass valve is maintained open by pressure differential across the bypass valve to supply trap reseal flow until the metering valve assembly recloses.

Abstract: A method and device are provided for preventing a child or an object from being trapped by suction to a drain of a swimming pool filter pump system. The invention entails a safety valve capable of causing the filter pump to immediately lose its prime when a child or object becomes trapped against the drain of a swimming pool, so that the vacuum created by the filter pump is completely eliminated. The valve of this invention can be mounted directly to a suction line fluidically interconnecting the drain and the filter pump, and is constructed to permit air to rapidly flow into the suction line if a predetermined vacuum level is exceeded within the suction line, as is the case if the drain becomes partially or completely obstructed. The influx of air causes the filter pump to rapidly lose its prime, thereby completely eliminating the vacuum and the resulting hazardous condition.

Abstract: A hydraulically operated control valve with a cam member that pivots toward one or the other side of the neutral position in response to an operating member. A pair of push rods each with a piston interposed between the cam member and one of a pair of spool valves. A casing is provided wherein the cam member is mounted in the casing upper portion. A pair of piston chambers, each having an oil chamber formed at the top by the piston and a damper chamber formed at the bottom by the piston, are formed in the casing lower portion. A throttle in each piston communicates fluid between the corresponding oil chamber and the damper chamber. A pair of spring chambers each contain a spool valve at the center thereof. A pair of casing partition members separate the piston chambers and the spring chambers, and are adapted so the push rods extend through the center thereof. A pair of damping springs energize the pistons in the direction of departing from the partition members.

Abstract: A metering valve includes a valve body with an inlet passage and an outlet passage defined therein, and a movable stem member disposed between the inlet passage and outlet passage. An inner sleeve member is configured within the valve body and has an inner diameter surface defining a chamber, the stem member being movable through the chamber. A piston assembly is disposed within the chamber and is configured with the stem member to move therewith. The piston assembly includes a sealing device which engages with the inner sleeve member inner diameter surface during movement of the piston assembly to the closed mode. A metering passage is defined through the stem member between a location above the sealing device to a location below the sealing device such that the rate of return of the piston assembly from the open mode to the close mode is dependent upon the size of the metering passage.

Abstract: A fluid pressure control valve suitable for a pressure intensifying valve of an automotive anti-skid brake control system comprises a valve housing, a solenoid attached to the valve housing, a plunger slidably enclosed in the valve housing and having a main valve portion at one end thereof to close the valve in response to energizing of the solenoid, and a return spring disposed in the housing for biasing the plunger in a valve opening direction. The pressure control valve includes a dashpot like device arranged at the other end of the plunger, for dampening a motion of the plunger in a valve opening direction.

Abstract: An actuator and valve assembly for an electronically-controlled injector is disclosed which comprises an electrically-energizable actuator assembly and a device for communicating, collecting and draining damping fluid with respect to at least one cavity of the actuator assembly. If too much damping fluid remains in the actuator assembly after engine shutdown, that damping fluid may cool off and cause slow response of the actuator and valve assembly during cold engine starting. The end result is that quick starting and/or operation of the engine may be hindered, particularly under cold engine conditions. The communicating, collecting and draining means permits at least a portion of the hot damping fluid to automatically drain from the cavity after the engine has been shutdown.

Abstract: A hydraulic solenoid valve includes a valve housing with bores for receiving a hydraulic medium and having at least one consuming device connection and a return connection connected to the bores. A piston is connected within the valve housing and has at least one piston bore. A first valve with a corresponding valve seat is connected to the piston for opening and closing the piston bore. The first valve in its open position provides communication between the consuming device connection and the reservoir connection. A magnet housing has connected therein an armature. When the armature is displaced during normal operation in both directions, it rests at the first valve and forces the first valve into its valve seat. A return spring is positioned between the piston and the valve housing. The armature is displaceable by the force of the return spring. The piston is displaceable by the armature against the force of the return spring.

Abstract: A metering valve for controlling fluid flow is provided which includes a piston assembly disposed between a fluid inlet and a fluid outlet and mounted for relative movement within a tubular unit between a first open mode, a second open mode connecting the fluid inlet and outlet and a close mode. The assembly is biased to assume the close mode and assumes the first open mode when a predetermined first external form is applied to a valve actuating element forming a component of the metering valve. The assembly assumes the second open mode when the first external force is enhanced by a predetermined second external force applied to the valve actuating element. When the external forces are released, the piston assembly automatically returns to the close mode upon successively moving through first and second segments of travel relative to the tubular unit. The rate of travel during the first segment is substantially less than the rate of travel during the second segment.

Abstract: A self-shutting egress valve comprises a hollow valve body having an annular valve seat provided in a lower portion thereof, a valve piston movably positioned within the valve body and having an escape valve provided on an upper portion thereof, and a push rod depending from the valve piston. The valve body has an orifice and a set of inlet apertures formed respectively on a top portion and around a lower periphery thereon. The valve piston carries an annular, elastic flow controlling element thereon which engages the walls of an upper chamber in the valve body. A set of apertures formed around an upper portion of the push rod is in communication with the escape valve thereabove. Pushing up on the push rod opens the escape valve and thrusts the valve piston upward into the upper chamber of the valve body causing fluid to flow downwards therethrough and also around the flow controlling element.

Abstract: The coil arrangement of an electromagnetic valve has a stationary core that is provided with a stop face for having one end of an armature abut thereagainst. The stop face and the one end of the armature is located in a damping chamber, the other end of the armature mounting a closure member for abutting against a valve seat to block fluid flow therethrough. Between the armature and the guide member there is a throttle path that fluidly connects the damping chamber with the valve seat chamber. The electromagnetic valve is especially suitable for conveying contaminated media.

Abstract: The present invention is a thermally compensated noise control device for a solenoid-actuated valve. The device includes a thermally expanding ring which varies the amount of clearance between a damper assembly and a passageway in which the damper assembly is disposed to control fluid flow past the damper assembly.

Abstract: The present invention is directed to a mechanical hydraulic pressure dampening devices for use in a steering system of an articulated self-propelled work vehicle. The dampening devices are hydraulically positioned between the steering cylinders of the work vehicle and absorb hydraulic pressure spikes in the steering system. In the preferred embodiment, the pressure dampener comprises a pressure accumulator that is fluidly coupled to the steering cylinder by a shuttle check valve. The shuttle check valve shifts in response to a pressure spike so that it can be absorbed by the pressure accumulator. In a second embodiment, the pressure dampener comprises a cylinder having two pistons that are biased into a normal position by a spring extending between the pistons. Spaces are formed on either side of the pistons and are hydraulically coupled to the steering cylinders. A central space formed between the two pistons is hydraulically coupled to a sump return line.

Abstract: A self-closing valve assembly for sanitary installations is disclosed. The valve assembly includes upper and lower valve housings which define a metering chamber that is normally filled with a metering fluid. A metering means, shiftably mounted in the lower valve housing, includes a first one-way valve means which displaces a predetermined volume of the metering fluid when said valve assembly is shifted to its opened position. A closure means, which includes a second one-way valve means, is operably coupled to the metering means to automatically shift said metering means from its opened to its normally closed position, by transferring the displaced volume of said metering fluid in the metering chamber through a second one-way valve means after a predetermined period of time has elapsed, to thereby close said valve assembly.

Abstract: A control valve for limiting the flow rate of a fluidized medium to a hydraulic motor during start up of the motor so as not to induce loads which exceed predetermined torque limits of apparatus driven by the motor. The control valve includes a poppet which is spring biased to a seated closed position. Increasing inlet-to-outlet pressure differential unseats the poppet in a downstream direction uncovering bypass ports which allow an initial surge of fluid to the motor to accelerate the motor to a predetermined speed at a rate which does not exceed the torque limits. Further downstream movement of the poppet exposes greater cross-sectional areas of main inlet ports which permit additional modulated fluid flow to accelerate the motor to its operational speed. The rate of movement of the poppet in the downstream direction is limited by flow restrictor orifices which conduct fluid which is displaced from a chamber due to the downstream movement of the poppet.

Abstract: A pulsation limiter for a manually actuated hydraulic valve includes a spring biased, motion retarding plunger in an auxiliary bore within the valve housing and having a helical groove disposed on its periphery abuts against the input sleeve during the initial portion of its travel to actuate the brakes, a check valve in the plunger allowing filling of the expanding cavity in the auxiliary bore behind the motion retarding plunger. When the brake pedal is released partially or completely, the input sleeve moves until it abuts against the plunger. Thereafter, the pressure buildup in the auxiliary bore cavity closes the check valve in the plunger and the input sleeve can only move relatively slowly back to its initial position as the fluid trapped in the auxiliary bore cavity exits through the helical groove.

Abstract: The non-return valve comprises a housing provided with an inlet connection, a coaxial installation opening, and an outlet connection. An insert is secured in the installation opening to define a chamber with a cover on the valve. A movable valve body means includes a piston which divides the insert chamber into two cylindrical chambers while connecting ducts lead from the respective cylinder chambers to the housing chamber on the outlet side. A damping member is provided on the movable valve body system in the form of an annular ring to penetrate into the duct leading from the lower cylinder chamber when the valve closes to bring about a throttling action. Shock-like closure of the valve is thus eliminated in a simple and operationally reliably manner.

Abstract: An adjustable slow closing valve assembly includes a valve body having a bore to receive a valve cartridge with inlet and outlet ports communicating with the bore, the valve cartridge having a tubular retainer providing means defining a valve seat and means reciprocably mounting a valve stem with the stem carrying an operating handle at one end and a valve member adjacent the other end to cooperate with the seat.

Abstract: A check valve is comprised of a body having inlet and outlet passages and a cylindrical chamber within the body, the axis of which forms an angle with the axis of the inlet and outlet passages. An orifice plate in the cylindrical chamber divides the chamber into a dashpot chamber and a valve chamber which is in communication with the inlet and outlet passages. A valve seat in the valve chamber separates the inlet and outlet passages. A valve closure element is mounted for reciprocation in the valve chamber between a valve open position and a valve closed position where an element is seated upon the seat. A piston is mounted for reciprocation in the dashpot chamber. A piston rod extends through an opening in the orifice plate and connects the closure element and the piston. Means are provided to apply the pressure in the outlet passage to the piston to urge the piston and closure element toward valve closed position.

Abstract: A pulsation limiter for a manually actuated hydraulic valve includes a spring biased, motion retarding plunger in an auxiliary bore within the valve housing and having a helical groove disposed on its periphery abuts against the input sleeve during the initial portion of its travel to actuate the brakes, a check valve in the plunger allowing filling of the expanding cavity in the auxiliary bore behind the motion retarding plunger. When the brake pedal is released partially or completely, the input sleeve moves until it abuts against the plunger. Thereafter, the pressure buildup in the auxiliary bore cavity closes the check valve in the plunger and the input sleeve can only move relatively slowly back to its initial position as the fluid trapped in the auxiliary bore cavity exits through the helical groove.

Abstract: A dashpot assembly has a movable cylindrical element mounted within a housing. The movable element has a chamber with a first opening for restricting flow of fluid into the chamber and a second opening for permitting rapid flow of fluid out of the chamber. An enlarged head is disposed inside the chamber and is coupled to a poppet with a spring coupled between the poppet and the movable element. When the poppet moves in a direction away from the movable element, the enlarged head closes the second opening and pulls the element. Fluid then flows into the chamber only through the restricted first opening, thereby damping the rate of movement of the poppet. When the poppet moves in a direction toward the movable element, the enlarged head opens the second opening and the spring is effective to move the element in the same direction; fluid flows unrestricted through the second opening, thereby permitting an undamped movement of the poppet.

Abstract: A mixing valve for hot and cold domestic water has a control member (20,22 and 23) movable within a body (12) whereby axial movement of the control member controls opening and closing of communication from hot and cold inlets (13 and 14) to an outlet (32, 2) and rotation of the control member controls the relative proportions of fluid flow from respective inlets to the outlet. A pressure chamber (90) is supplied with pressure fluid from the inlets for assisting closing action of the valve upon closure of a vent (28,30) from the pressure chamber. In order to resist pressure surges at either inlet a restricted aperture (83) is provided to reduce flow from a reducing volume movement damping chamber towards the end of closing movement of the valve control member to prevent the final portion of the valve closing movement being too sudden.

Abstract: The valve of the pressure vessel has a head portion adapted to close the liquid orifice and a stem portion mounted slidably in a guide and defining therewith a variable-volume liquid chamber. A passage is provided between the chamber and an orifice disposed in the vicinity of the head portion. The passage comprise a cylindrical portion in which a ball or other closure member is mounted with a slight clearance, which makes it possible to prevent closure of the valve upon rapid restoration of the liquid in the course of operation, while nonetheless permitting complete emptying of the vessel when the liquid is restored slowly, for example for the purposes of maintenance or inspection.