Abstract: A piston assembly for use in a flush valve for operating toilets and urinals, with the flush valve having a body having an inlet and an outlet and a valve seat at the outlet. The piston assembly is movable in the body toward and away from the valve seat to control flow from the inlet through the outlet. There is a relief valve in the piston assembly for venting a flush valve pressure chamber to the flush valve outlet. The piston assembly has an outwardly directed lip seal which bears against an interior wall of the body, with the lip seal being held between facing elements of the piston assembly. The lip seal includes an insert and an elastomer overlying and substantially enclosing the insert. Both the elastomer and the insert have portions extending toward the flush valve body wall and the insert has support elements which are in contact with the facing elements of the piston assembly to take the load from such elements off of the elastomer body of the lip seal.

Abstract: A hydraulically controllable globe valve having a stem piston to which pressure can be applied by a spring connected to a pressure source, with the stem piston being able to move from a first end position in the direction of a second end position. Pressure control means are provided which maintain a constant pressure of the hydraulic spring means on the stem piston while the latter moves from the first end position in the direction of the second end position by connecting the hydraulic spring means to a pressure source during a variable portion of the valve lift. The valve can be used, for example, as a gas exchange valve in a reciprocating engine.

Abstract: A valve arrangement (10) for hydraulically actuated machinery installations, especially for powered support assemblies in underground mining, with hydraulically actuated working valves (12, 13, 14) to control hydraulic cylinders (11) or other hydraulically actuated machinery units of the machinery installation and with pilot valves (15) controlling the working valves. In order to avoid the pilot valves (15) and working valves (12, 13, 14) entering an unstable operating condition in the event of a falling off of pressure in the hydraulic fluid supply to the valves, and opening and closing in an uncontrollable and undesired manner, the pilot valves (15) are attached to their own pressure medium supply (17), separate or separable from the hydraulic fluid supply (20) to the working valves (12, 13, 14), so that pressure variations in the hydraulic fluid supply circuit do not affect the pressure medium for the switching of the working valves (12, 13, 14), but the pressure in them is maintained largely constant.

Abstract: A fluid control valve has a valve member which, on closing creates a stagnation zone between the valve member and a surface within the valve. In the stagnation zone fluid pressure is greater than it is in an adjacent constriction zone. This causes the valve to close slowly, thereby reducing the likelihood that water hammer will occur on closure of the valve. The design of the valve member also reduces resonances which can cause annoying noises and premature wear. A flow restriction chamber further slows closure of the valve. The fluid control valve may be controlled by a conventional 3-way pilot valve. Preferably the fluid control valve is used with a pilot valve according to the invention having a rocker member which, on actuation, first closes an inlet valve member and then opens an outlet valve member. The pilot valve may be used in other situations where a 3-way valve is needed.

Abstract: A hydraulic diaphragm valve comprising a housing, an inlet, an outlet, a diaphragm valve seating between the inlet and the outlet, a sealing diaphragm mounted in the housing and displaceable about the diaphragm valve seating, so as to close and open a flow path between the inlet and outlet, a valve control chamber and a command valve comprising a first duct communicating at one end thereof with the valve inlet, and at an opposite end thereof with a first command valve seating, a second duct communicating into one end with the valve outlet, and at an opposite end thereof, with a second command valve seating. A third duct communicates at one end with the valve control chamber and at its opposite end it selectively communicates with the first and second command valve seatings.

Abstract: A high pressure fuel system includes tapped high pressure flows (22,24) with restrictors (44,46) to provide low pressure flows with which, via a valve (50) to enable either a low pressure flow to bias a main, high pressure fuel cut off valve (16) to close at a steady given rate, or a high pressure flow across a further valve (30), to close the valve (16) at a faster rate.

Abstract: Herein is provided an improved proportional fluid control valve. The proportional valve includes a fluid valve that controls the flowrate of an output fluid. The fluid valve is coupled to a pressure chamber of the control valve. The position of the fluid valve, and the corresponding flowrate of the output fluid, can be varied by changing the pressure of a working fluid within the pressure chamber. The pressure within the pressure chamber can be increased by a piston that pumps working fluid from a reservoir to the chamber. The piston is coupled to a first solenoid and a spring that move the piston in a reciprocating pumping motion. The pressure of the working fluid within the pressure chamber can be decreased by opening a bleeder valve that allows working fluid to flow from the pressure chamber back to the reservoir. The bleeder valve is coupled to a second solenoid and a spring that open and close the valve.

Abstract: An on/off valve (O/OV) and directional valves (DV1, DV2) are packaged with a switching valve system (10) in a housing assembly (156, 157, 158, 160). The on/off valve (O/OV) is operated by a control handle (154) that is located at one end of the housing assembly (156, 157, 158, 160). The direction control valves (DV1, DV2) are operated by a handle (141) located at the opposite end of the housing assembly (156, 157, 158, 160). The control handles (154, 141) operate to position cams (152, 136, 138) which function to help position valve plugs. In a second embodiment, the handle (141) and cams (136, 138) for controlling the directional valves (DV1, DV2) are replaced by a solenoid valve system (SV2). A second solenoid valve (SV1) is added to the control system for the off/on valve (O/OV). The solenoid valve (SV1, SV2) allow for a remote positioning of the controls for the off/on and directional valves (O/OV, DV1, DV2).

Abstract: In order to achieve repeatable, consistent operation of a counterbalance valve, a poppet valve element within the valve has a radial bore therein in communication with a control fluid port and an axial bore therein which receives a rod that is anchored to a poppet valve cage that surrounds the poppet valve element. The poppet valve element is urged by a spring into engagement with a valve seat and pilot pressure is applied in opposition to the spring. By virtue of this arrangement, control fluid pressure is applied via the rod directly to the valve body in which the poppet valve element and cage are mounted. By changing the diameter of the rod and axial bore through the poppet valve element which receives the rod, the relief set pressure can easily be changed.

Abstract: In a hydraulic valve control arrangement particularly of an internal combustion engine wherein the valve has a valve stem by which it is supported so as to be slideable between a closed and an open position and first there are provided first spring means biasing the valve in the closed position and second spring means providing an opening force which is transmitted via a valve tappet and an end of the valve tappet is received in a cylinder which is engaged by the second spring means so as to form a hydraulic force transmitting structure to which hydraulic fluid can be admitted for tensioning the second spring means. The valve tappet has a control piston received in a control chamber to which pressurized fluid is admitted which holds the control piston in either of its open or closed valve end positions and a pressure space is arranged adjacent the closed valve end positions of the control piston to which pressurized fluid can be admitted for initiating opening of the valve.

Abstract: In a hydraulic operating mechanism for a valve which comprises a valve stem with first spring means acting on the valve stem in the valve closing direction, and second spring means acting at least intermittently on the valve stem in a valve opening direction, the compressing force of the second spring means is controlled hydraulically during the operation of the valve control device. In order to keep the control forces required for operating the valve as low as possible over its entire operating range, the second spring means comprises a spring combination composed of at least two springs which have different spring forces providing for a maximum spring force of the second spring means at the start of the valve opening stroke.

Abstract: A diaphragm valve for use with cryogenic systems controls the flow of cryogen and is capable of operating at high pressures for extended periods of time. The diaphragm consists of a polyamide film sandwiched between to manifold sections. A pilot valve controls the pressure of cryogen against one face of the diaphragm to open and close the diaphragm.

Abstract: An on/off, protective circuit has a pressure line with an inlet for connection to a pressure source and an outlet for connection to the pressure port of a hydraulic system, such as a reciprocating conveyor. A relief valve is spring biased into a closed position and openable by pressure in the pressure line to short circuit pressure from the pressure line to a return line when an on/off valve is in an off position. The spring biasing of the relief valve causes residual pressure in the pressure line. To prevent communication of the residual pressure out through the pressure outlet and into the hydraulic system and thereby prevent creeping movement in the system, a check valve is provided in the pressure line downstream of the relief valve. The check valve has a valve plug positioned to be closed by pressure in the pressure line.

Abstract: A flow control valve that has a solenoid operated pump that moves a poppet between an open and a closed position. The valve has a housing with an inlet, an outlet and a housing chamber that can allow fluid to flow from the inlet to the outlet. The poppet is located within the housing chamber and is adapted to move from an open position to a closed position, to control the flow of fluid through the valve. Attached to the poppet is a pump that has a first pump chamber separated from a second pump chamber by a wall. The wall has a first one way valve that allows fluid to flow from the second chamber to the first chamber. The second chamber has a diaphragm attached to a solenoid. The solenoid is provided with a series of energizing pulses that move the diaphragm and cause the second chamber to expand and contract. The pumping action of the second chamber causes fluid to flow into the first chamber. The first chamber thereby expands and moves the poppet into the open position.

Abstract: A rate-of-flow control valve assembly actuable as a function of velocity of fluid in a conduit includes a sensing plate projecting into the conduit, substantially perpendicular to a direction of flow in the conduit and a sleeve valve located downstream of the sensing plate. The sleeve valve includes a substantially cylindrical, flexible rubber sleeve surrounded by a control chamber, and an outer rigid sleeve, the flexible sleeve adapted to vary the flow rate of the fluid through the sleeve valve. Also included is a spool valve controller operatively connected to the sensing plate and in communication with the control chamber in the sleeve valve, the spool valve operable to control the flow of fluid into and out of the control chamber as a function of movement of the sensing plate in the conduit.

Abstract: The invention relates to a freely activatable hydraulic valve control device for a stroke valve, which valve control device is arranged particularly in an internal-combustion engine. The stroke valve includes a valve stem and a first spring acting on the valve stem in the valve-closing direction as well as a second spring acting at least periodically on the valve stem in the valve-opening direction. The valve stem is connected at least to a control piston arranged in a working space and capable of being loaded on two sides with a working fluid. The pressure of the working fluid in the working space can be regulated via a pressure source together with a switching valve and a supply conduit.

Abstract: An actuator has been developed for actuating a valve for controlling fluid flow in a conduit, the actuator having, in one aspect a housing with a main interior housing space, a rod with a mid-portion, a top end and a bottom end, the mid-portion movably disposed in the housing, the bottom end movably extending from the housing and interconnected with the valve, a first piston member secured to the rod and movable in the housing as the rod moves, a second piston member movably disposed in the housing above the first piston member, the second piston member movable to contact the first piston member, first power apparatus for moving the rod to open or close the valve, and second power apparatus for moving the second piston member to contact the first piston member moving the first piston member and the rod to close the valve. In one aspect the rod has a stop shoulder above the first piston member, and the second piston member is movable to contact the stop shoulder to move the rod.

Abstract: A faucet control device to provide asepsis and conservation of water consisting of a diaphragm valve block connected inline between the hot and cold water supply and faucet. Pilot hot and cold water pressure from said valve block is routed through three flexible conduit assemblies to a three-way valve remotely located to facilitate operation by knee, foot or elbow. The application of force to the three way valves cycles the diaphragm valve block from the closed to open position while preventing crossflow between the hot and cold water supplies.

Abstract: A valve comprises a first rigid layer having a substantially planar first surface, a second rigid layer having a substantially planar second surface facing the first surface and a substantially planar third surface opposite the second surface and a flexible layer positioned between the first and second surfaces. A valve chamber is demarcated by a concave surface in the substantially planar first surface and one surface of the flexible layer and at least one first fluid passageway in the first rigid layer opens into the valve chamber at the concave surface to alternatively apply a vacuum and pressure thereto. A fluid chamber is demarcated by another surface of the flexible layer and a concave-convex surface in the substantially planar second surface which comprises an inner circular convex portion and a concentric annular outer concave portion. At least two second fluid passageways in the second rigid layer open into the valve chamber at the convex surface.

Abstract: A spill valve for a fuel injection pump includes a valve member movable towards a seating to prevent spillage of fuel from the pumping chamber of a fuel injection pump. The valve member is actuated by a piston against which fluid pressure can be applied to close the valve member onto the seating. The movement of the valve member away from the seating is limited by a stop member but this can move to allow increased movement of the valve member when fuel at high pressure is spilled from the injection pump.

Abstract: A thermostatic mixing valve and method of use thereof. The thermostatic mixing valve is controlled by the incoming hot and cold fluids, which are mixed in a mixing chamber, by a thermally responsive element disposed in the flow of the fluid mixture in a fluid outlet from the mixing chamber. A distributor for distributing the flow is controlled by the thermally responsive element. A drive is activated by pressure of the fluid and is connected to the distributor for controlling the position of the drive. The distributor is used to control the hot and cold fluid flows. Channels are provided to connect the distributor with one of the fluid inlets, to connect the distributor with the outside of the valve body to conduct away used operating fluid and to connect the distributor with the drive.

Abstract: A protective circuit (40) for pressure and return connections of a hydraulic system. The protective circuit includes a four-way, two-position on/off valve (65) having a first (66), second (68), and third (70) port. In its "off" position, valve (65) connects ports (68, 70) and blocks port (66). In its "on" position, ports (66, 70) are connected and port (68) blocked. A pilot valve (46) is provided including a valve plunger (56) and piston (58), which defines a valve chamber (52) and pilot chamber (54). Valve chamber (52) is connected to pressure and return, while pilot chamber (54) is connected to port (70) of valve (65). A first one-way check valve (96) and second one-way check valve (78) are also provided.

Abstract: The reliability of a fluid multiplexed actuation system is increased by arranging a pair of fluidic multiplexers in a parallel fluid flow path between a selector valve and several fluid actuators. Position sensors associated with the fluidic multiplexers and with the fluid actuators provide feedback signals to a microprocessor. In the event the feedback signals identify a malfunction in the fluidic multiplexer currently supplying fluid to the actuators, the microprocessor will deactivate the malfunctioning fluidic multiplexer and activate a redundant or back-up fluidic multiplexer by actuating the selector valve.

Abstract: A timed watering system for lawns, gardens, and the like, utilizing a flow actuated timer valve. The system is configured to provide a reliable and cost effective, easily implemented system for automatically dispensing a pre-determined amount of water on the area to be watered, with the valve shutting off the flow automatically once the desired amount of water has flowed through the valve. The present system can also be installed directly into the water system by municipal authorities or the like as a means of controlling the use of water and preventing waste of same. Upon reaching the predetermined maximum amount, flow to outdoor faucets would cease, and could not be re-initiated until the end of the month, when the meter is read and the valve re-set. This design may also be utilized in a reverse flow configuration, wherein the backflow pressure initiates closure of the valve, allowing for automated filling of tanks, or preventing damage to equipment to excessive pressure or lack of adequate flow.

Abstract: This hydraulic safety and regulating system for a steam feed of a turbine has a rapid-action (4) and a steam regulating valve (3), and a line system monitored by a safety downward-control unit (22). The monitored line system is designed as both a power oil supply and as a safety oil system. This results in a hydraulic safety regulating system which is simple to build and has a reduced number of possible leakage points.

Abstract: A back pressure control device is connected to the actuator of a control valve to limit the amount of gas released from the actuator after each actuation. Approximately two thirds of the volume of the actuation gas is retained in the actuator by the subject device after each actuation, this being both the release of a sufficient volume to assure actuation of the control valve while retaining gas which was heretofore wasted.

Abstract: Control valve for a hydraulic elevator provided with a speed regulating plug which moves in response to the flow of the hydraulic fluid and whose position determines the flow of hydraulic fluid into the actuating cylinder of the elevator. At each end of the speed regulating plug, there is connected a system of hydraulic channels in which the hydraulic fluid flows, and which communicates with the main hydraulic circuit. An additional channel is connected to the hydraulic channel system, the additional channel being provided with a flow resistance component comprising a capillary throttle and a pressure compensated reservoir, such that the flow of hydraulic fluid through the additional channel is varied in inverse relation to the viscosity of the fluid. By this means, the closing speed of the speed regulating plug, and thus the deceleration rate of the elevator, is maintained constant throughout the operating temperature range of the hydraulic fluid.

Abstract: A gas accumulator and blaster apparatus including a pressure tank (12) and a quick release valve (14). The quick release valve includes an elongated outer sleeve (22), an end cap (28), a check valve (32), a shouldered guide member (38), a cup shaped piston (56), and an annular seat member (68). The tank is filled with a gas by means of a conduit (36). The gas accumulated in the tank is quickly exhausted through a second end (26) of the quick release valve and into a storage bin as and when gas is exhausted from interior of the piston, guide member, and conduit. The piston quickly returns to a closed position as and when the flow of air from said tank stops.

Abstract: A filler spool valve is disclosed having an open ended housing with an elongated cylindrical passage therethrough. A valve core having a plurality of evenly spaced arcuate and inline passages is reciprocated by a pneumatic cylinder connected thereto by a quick connect coupling to alternately cause a flowable product to flow along generally C-shaped passages, and thereafter linear passages, in the spool valve in response to reciprocation of the valve core. The valve core is easily removed from its housing for cleaning by opening a quick release coupling and manually pulling the core from the cylindrical housing.

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: A slide valve for fluid wherein a slide (3) is axially reciprocally movable in a housing chamber (2) of a valve housing (1). A housing channel (7) in the valve housing (1), which housing channel communicates with a first external connection (8), is provided with a recess (16) directed toward the slide (3) and the piston (3) has a slide channel (14) which communicates with a second external connection (11) via a further recess (15). The slide valve is designed such that passage of fluid does not become blocked by impurities in the fluid, and the slide valve is capable of fine-variability. This is achieved in that the upstream recess (16) has a cross-section which narrows in the direction of the slide valve axis toward the housing channel (7) when the slide (3) is in the closed position. In order to achieve finely variable dosage regulation by the slide valve, the upstream recess (16) has variable cross-section, as the slide (3) is moved in the housing chamber (2).

Abstract: A damper for an air handling system in which the blade or blades are normally positioned to permit air to flow through the damper by a pneumatic cylinder which, when pneumatically actuated, overcomes the force of a spring within the pneumatic cylinder which would otherwise position the blade or blades to close the damper to air flow. The pneumatic cylinder normally receives air through a primary outlet of a three-way valve, the three-way valve also having a vent outlet and a valve member which is movable to permit pneumatic flow either from a source of pneumatic fluid through the primary outlet or from the pneumatic cylinder back through the three-way valve for venting through the vent outlet.

Abstract: An actuating device for pipe-chamber feeders of hydraulic transport equipments comprising valves or other closing appliances having a closing element that is movable reciprocally between an open and a closed position, the improvement being characterized in said closing element being associated with at least one speed control means, especially a speed reducing means acting at least at the end phase of the closing stroke of said closing element.The speed reducing effect of at least one of said speed control means may be adjustable.

Abstract: A gas valve for providing a short duration, high volume gas pulse includes an outer chamber having an exhaust gas outlet at its front and an inner chamber which extends along the outer chamber, and terminates, at its forward end, in an opening aligned with the gas outlet of the outer chamber and spaced rearwardly therefrom. Within the inner chamber, a piston is mounted for front-to-rear reciprocal movement, and the length of the piston is selected to be greater than the distance between the valve outlet and inner chamber opening. The piston is provided with an intermediate forwardly-directed, peripheral seat, and the piston's front is dimensioned to close the exhaust gas outlet when the inner chamber is filled with gas at a moderate pressure, which forces the piston forward. The outer chamber can then be filled with a charge of gas at a high pressure.

Abstract: A means for transmitting logic information from two members which move relative to one another by means of fluid logic signals.

Abstract: A control valve for increasing or reducing the air pressure in a tire of a vehicle wheel that is to be carried out over a short period of time, has a valve chamber that is connected, on one side, to the interior of the tire and, on the other side, to a supply duct. The valve chamber has a space that extends axially through the wheel hub, the interior end of this space being sealed off with respect to an axle part carrying the vehicle wheel. In this space, an automatically closing valve member is arranged that can be controlled into its open position against the interior pressure of the tire by a control piston that is also guided in this space and can be acted upon by a pressure medium. For supplying air to and removing air from the tire, the axle part projects into an axial duct of the control piston with a cylindrical projection that is penetrated by the supply duct.

Abstract: A diaphragm valve for controlling fluid flow. The valve contains a first and second diaphragm and a piston therebetween. The piston cooperates with the diaphragms controlling their movement within predetermined limits. The piston is preferably limited in travel to limit pressure applied to one diaphragm by means of a mating seat disposed between the diaphragms.

Abstract: An automatic safety mechanism including an actuator for operating a valve or other controlled unit and which is operable by compressed air or other pressurized fluid, a valve structure for controlling the delivery of pressurized fluid from a source to the actuator, a shock responsive mechanism operable by shock forces to actuate the valve structure to a condition operating the actuator by fluid from the source, and a device operable automatically in response to a decrease in the pressure of fluid from the source to admit pressure fluid to the actuator for operating it. An assembly for resetting the shock responsive mechanism to a cocked position includes a shaft operable by rotation about an axis to set the mechanism, a sleeve disposed about the shaft, and a retaining element movable to a position in the path of axial removal of the sleeve from the device to retain both the sleeve and shaft against withdrawal.

Abstract: The device has one valve body that can be set at a constant minimum cross-section and another valve body that is not activated until the pressure in a supply connection becomes too high. The valve bodies are accommodated in separate and parallel-streamed valve housings. Since the design allows free selection of the cross-section in the valve housings, extremely wide fluctuations in the concentration of cream can be mastered in accordance with controls technology by means of the second valve body.

Abstract: A poppet valve in which a poppet is slidable in a valve body and opens or closes a main valve path for pressurized fluid at one end. The pressurized fluid is conveyed to a back pressure chamber at the rear of the poppet either through a reduced flow path or through a valve arrangement between the surfaces of the poppet and a poppet spool slidable within the poppet. Either a control rod or the poppet spool moving relative to the poppet opens a flow path at the side of the back pressure chamber and the flow continues through a hollow in the spool or the control rod to an oil chamber away from the back pressure chamber where it is released to a tank.

Abstract: A sanitary control back pressure diaphragm valve employed in a sanitary control system wherein the sanitary valve controls the pressure applied to a fluid in a sanitary contained system, which valve comprises: a valve body having an upper and lower valve member defining a generally conical fluid passageway and a valve seat, the members adapted to move between an open position and a closed position; a diaphragm support between the upper and lower members and a resilient diaphragm on the members on the diaphragm support to provide a seal between the upper and lower members and to provide for relative movement of said valve members between the open and closed valve position, the upper and lower valve members defining a generally conical valve passageway between the valve members, and the valve including a pressurized air inlet to provide controlled air pressure of one member; a sanitary fluid inlet extending in a straight line at an angle into the fluid passageway and a sanitary fluid outlet for the discharge of

Abstract: A device for controlling the displacement of a moving member by means of of a fluid distributor connecting a single-acting actuator for displacing the moving member to a source of fluid under pressure and to an exhaust, wherein the fluid distributor comprises a fixed element (68) having hoses providing fluid connections to the actuator, to the source of fluid under pressure, and to the exhaust, a moving element (64) constrained to be displaced by manually-operated control means, and a moving element (66) constrained to move with the moving member or the piston rod of its actuator. The invention is particularly applicable to controlling the displacement of flaps in an installation for heating and ventilating or for air conditioning a motor vehicle.

Abstract: A discharge valve and baffle assembly is provided in a refrigeration system having either one or more compressors. The discharge valve and baffle assembly eliminates the effects of an established head upon starting the associated compressor, thereby permitting the compressor to quickly come up to speed for the established head. During compressor operation, the discharge valve and baffle assembly provides a suction force for holding the valve in the open position to prevent bouncing of the valve during part-load conditions and cycling of the valve between the open and closed positions during surge conditions. The assembly prevents backflow of refrigerant through the nonoperating compressor, and also provides a baffle effect to direct the flow of high pressure gaseous refrigerant uniformly into the condenser.

Abstract: A flow control valve in which the main body of the valve and the first and the second cylinder is disposed coaxially with each other. The valve body disposed in the main body forms a first and a second separate chamber in the main body. A first and a second valve rod projecting from the valve body opposes the first and the second cylinder, respectively. The displacements of the pistons in the first and the second cylinder due to a fluid limits the displacement of the valve rods and the valve body. The opening and the closing of the passageway between the first and the second separate chamber is adjusted by the movement of the valve body, thereby flow of fluid being controlled.

Abstract: A valve assembly is provided which includes a seat structure and a cage structure. A valve member is movable between open and closed positions and includes an upstream side adapted to engage the seat structure with the valve member in its closed position and a downstream side connected to the cage struture. The cage structure includes a manifold communicating with the valve member downstream side. A pilot valve is provided for selectively venting the manifold to an area of low fluid pressure whereby the valve member is held in its open position.

Abstract: A domestic pillar faucet has a main flow path and a control flow path, both connected to the same inlet. A diaphragm supports a valve member for displacement between a position in which the valve member is held open and a position in which the valve member closes the main flow path. Displacement of the diaphragm is controlled by fluid from the control flow path. The control flow path includes an inlet valve and an outlet valve and the section of the control flow path between the valves communicates with the diaphragm. By opening the outlet valve, the force on the diaphragm is reduced and the valve member will open. By closing the outlet valve and opening the inlet valve, the force on the diaphragm is increased and the valve member will close. The valves are operated by a lever through push buttons. The faucet is thus operated in a power assisted manner, not needing the dexterity required when opening or closing conventional faucets.

Abstract: A pilot-operated diaphragm valve in which the diaphragm seats on a valve seat having an unconstricted flow annulus therearound, and support regions are provided on the valve seat and on the valve body for support of the diaphragm when in closed position. The support region on the valve seat further performs important sealing functions, as does a sealing lip disposed radially-inwardly of the sealing and support region of the valve seat. To stabilize the diaphragm at various partially and fully open positions, and to augment sealing action when the valve is closed, a spring-pressed poppet is disposed above the diaphragm and is guided by a valve stem and bearing. A peripheral region of the poppet bears a certain relationship to the sealing portions of the valve seat.

Abstract: A trip throttle valve with a manual exerciser and combination of a hydraulic piston and a biasing force bearing sleeve is provided in place of a piston. The piston is not directly connected to a valve stem and the sleeve is threadably engaged with the valve stem so as to cause relative axial movement between the sleeve and the valve stem when the stem is rotated through the manual exerciser. The hydraulic portion of the valve is provided with a by-pass passage so that the piston is made axially movable toward the sleeve under the pressure which occurs when the by-pass passage for the hydraulic liquid is blocked but the piston is arrested at a certain axial position where the by-pass passage is still blocked and the axial movement of the sleeve is restricted against the piston.

Abstract: The switching time in opening and closing a valve is determined by a closing throttle and an opening throttle which both together are arranged in series with a check valve. For closing the valve the check valve is opened thus making the opening throttle ineffective so that the closing speed is solely determined by the cross-section of the closing throttle. For opening the valve the check valve is closed so that the control pressure is decreased across the opening throttle defining a desired opening speed.

Abstract: A reservoir loading valve accomplishing a pressure protection of the reservoir circuit comprises a pre-control valve subject to the pressure of the control circuit and which controls depending on this pressure a switching valve the piston of which in turn controls the connection between a pump and a working hydraulic and the reservoir circuit. The reservoir circuit is supplied with pressure fluid through a blind bore and a transverse bore in the piston of the switching valve, while a flow control orifice is provided in the blind bore and controls the size of the flow of volume flowing to the reservoir circuit. When the reservoir is loaded and the working hydraulic circuit is connected, the piston of the switching valve will be displaced by the high pressure delivered by the pump into a position in which the connection between the pump and the reservoir circuit is completely interrupted.