Abstract: A solenoid valve of the hung diaphragm type includes a diaphragm assembly having a pilot valve seat mounted for movement toward and away from a main valve seat in a valve body, a plunger assembly consisting of a valve disc holder reciprocably mounted in the pole piece of the electromagnetic valve resiliently supports a valve disc for cooperation with the pilot valve seat, being actuated by a plunger slideably mounted in an enclosure tube. The valve holder is biased to an upper position and a pickup extension spring is coupled between the valve holder and diaphragm valve assembly to lift the latter from the main valve seat. A necked down end of the valve holder prevents abrasion at the edge of the pole piece while a groove in the actuating face of the plunger prevents excessive distortion of the end of the pole piece due to repetitive impacts.

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 faucet includes a shut-off valve between its inlet connection and its spout, and a valve operator extending below the spout so as to be engageable by a user's hand when located below the spout to receive the water discharged therefrom. The valve operator comprises a stem passing through the spout and a latching device which latches the valve in the "on" position by one operation of the valve operator, and in the "off" position by the next operation.

Abstract: The piloted valve has three abutment surfaces for controlling the positions of the pilot lid and main lid. The abutment surfaces are disposed relative to each other so that the maximum stroke of the pilot lid relative to the casing is greater than the maximum stroke of the pilot lid relative to the main lid and less than the sum of the maximum stroke of the pilot lid and the maximum stroke of the main lid relative to the casing. With the pilot lid open and the main lid closed, a large flow cross-section is available; however, closing of the pilot lid with the main lid open requires only a very short stroke. The resulting valve operates very rapidly.

Abstract: The pressure responsive, pilot actuated, modulating valve comprises a main valve assembly which defines with the housing a first chamber and controls flow of fluid from an inlet port to an outlet port. A pressure responsive piston is provided which defines with the housing a second chamber. A vent passageway is provided in the piston for communicating the second chamber with the outlet port. A pilot valve assembly is provided to control flow through the vent passageway. A means is provided for selectively actuating the pilot valve assembly. A discharge orifice is comprised in the main valve assembly for communicating the vent passageway with the outlet port. A vent valve assembly is disposed to control flow of fluid between the first chamber and the discharge orifice.

Abstract: An orifice controlled poppet valve includes a pilot poppet pressure balancing arrangement which prevents fluid leakage between the valve inlet and outlet. The pressure balancing arrangement includes a pin slidable in a passage in the main valve member, which passage extends between the inlet and a pilot outlet passage. One end of the pin engages a stem which projects from from the pilot poppet. The other end of the pin engages a flexible diaphragm which forms a seal between the valve inlet and the passage which receives the pin. An inlet pilot passage includes an annular clearance upstream of an orifice. The radial dimension of the annular clearance is smaller than the diameter of the orifice.

Abstract: A flushing valve arrangement for controlling the flow of a pressurized flushing liquid includes a housing unit including an inlet and an outlet for the flushing liquid and a housing which bounds a flow passage that connects the inlet with the outlet. The housing is outwardly spaced from the outlet to bound therewith an annular channel which surrounds the outlet and opens into a communication region of the flow passage. A flushing valve unit is interposed in the flow passage downstream of the communication region and controls the flow of the flushing liquid from the inlet to the outlet. An externally actuatable shut-off valve unit is integrated into the arrangement and includes a shut-off sleeve surrounding the outlet and movable into and out of the annular channel toward and away from its closing position in which it extends into the communication region of the flow path and prevents the flushing liquid from flowing from the inlet toward the flushing valve unit.

Abstract: A proportional control valve is described having a housing with a bore formed therein. The first valve contains passages therein which communicate between the fluid inlet and the fluid outlet. Also positioned within the bore is a second valve which is aligned with one of the passages formed in the first valve. As the second valve is moved to a closed position, fluid flow through the passage is cut off and as the second valve is opened, fluid flow through the passage is permitted. A sleeve is also positioned within the bore which is constructed of a non-magnetic section sandwiched between two magnetic end sections. The sleeve contacts the first valve and is formed such that the non-magnetic section surrounds a portion of the second valve. The proportional control valve also contains an electromagnet for linearly moving the second valve in response to an input signal.

Abstract: A hydraulically unblockable non-return valve has a control piston (21), the control side of which can be connected with a control pressure medium source (35) and the other side of which can be connected with a supply container (33). In order to create a hydraulically unblockable non-return valve, in which the control side of the control piston does not need to be relieved of pressure, the other side of the control piston is perpetually connected with the supply container. Also provided is a throttle bore (27) which connects the two sides of the control piston with each other.

Abstract: The pilot operated valve assembly includes a flexible diaphragm (A) which selectively engages a valve seat (B) to open and close a fluid passage through the valve. The diaphragm has a plurality of filtering apertures 20 and an inward peripheral attaching projection 80. A diaphragm insert (C) is frictionally received in the diaphragm. The diaphragm insert has a pilot supply aperture 74 in fluid communication with a peripheral recess 76 extending inward from a peripheral edge. The diaphragm filtering apertures 20 are disposed in fluid communication with the peripheral recess 76 and the pilot supply aperture 74. The insert peripheral edge has a peripheral valley 82 for receiving the peripheral projection 80 of the diaphragm. The insert has a pilot outlet aperture 66 which is selectively opened and closed by an armature assembly (D). A guide shell (E) aligns the armature assembly (D) with the pilot outlet aperture 66 and defines a pilot reservoir with the diaphragm (A).

Abstract: A cartridge solenoid poppet valve (10) arranged to use a single size pilot valve (31) with any one of a set of a plurality of different size sets of valve seat members (14) and poppet valves (24). Pilot guides (175) are provided having different transverse extents to accommodate such different size valve members. The valve further includes a flatted pilot guide (32) defining flow passages communicated between a transfer chamber (35) and a pilot valve chamber (30) in which the pilot valve (31) is disposed. A T-slot (58) is provided in the solenoid plunger (38) extending fully diametrically thereacross and the pilot valve includes a T-shaped connecting head (71) received therein. The plunger (38) and plug (41) define cooperating stop surfaces (67,70) for maintaining a small spacing between the plunger and plug at all times.

Abstract: A pilot operated solenoid actuated valve assembly having a differential pressure sensing diaphragm for opening the main valve in response to loss of pressure through a pilot flow valve from a control pressure chamber. The pilot valve-armature is housed in a non-magnetic guide which is sealed about the diaphragm to form the control pressure chamber. Tubular pole segments surround the guide and define a magnetic air gap. An auxiliary pole piece is loosely received in the guide and is spring biased away from the armature. The pole piece enables the armature to be held fully open at a substantially reduced level of voltage from the actuation or service voltage.

Abstract: Upon energization a solenoid (58) activates a pilot valve means (44,46) for opening a pilot flow passage (34) causing flow from a pilot portion (52) of the valving chamber. Flow from the main valving chamber (18) and through a bleeder passage (50) is insufficient to prevent a loss of pressure in the chamber (52) and the pressure in valving chamber (18) urges diaphragm pad (29) upward away from contact with valve seat (26) to permit flow from chamber (16) to outlet (20). A diaphragm insert (30) has a portion (32) with a lip (68) extending into a narrow section (66) of outlet (32) for providing a downstream restriction to maintain sufficient pilot circuit differential to provide valve movement until rim (68) moves out of passage (66) thus providing any desired stroke by adjusting the level of (66) to prevent trapping fine particles of foreign matter at the valve seat.

Abstract: A timer in which the re-filling of a control chamber (26) via its inlet (56) causes displacement of a resilient wall (34). A surface (62) of the wall (34) thus engages a valve seat (64) to shut-off the inlet (14) of the timer from its outlet (20). To open the timer a cap (88) is depressed. A stem (90) depending from the cap depresses an element (44) against the action of a spring (60). The element (44) is thus displaced to open the outlet bore (42) of the chamber (26). Water pressure in the casing (12) acting on the wall (34) then urges it in the direction which separates the surface (62) from the seat (64). A series of stop surfaces (86) co-operate with a stop element (100) of the cap (88). The surfaces (86) are at different heights. The distance through which the cap (88) can be depressed is varied by rotating it so that the element (100) co-operates with a selected surface (86).

Abstract: A fluid flow control valve in which flow from an inlet (14) to an outlet (16) is controlled by engagement between a surface (92) and a seat (90). The surface (92) is displaced from the seat (90) when a closure member (44) is lifted to permit flow from a control chamber (26) through a bore (42). The resultant pressure drop in the chamber (26) enables pressure externally of the chamber (26) to displace the wall (34) which lifts the spigot 40 and hence the surface 92. When the closure member (44) re-seats, the chamber (26) can fill through a bore (56) and the wall (34) returns to its initial condition to close the valve. An operating member (66) protrudes through a shower rose (20). When the member (66) is pushed up, the piston (70) attempts to slide in the cylinder (74) and causes a pressure increase which thus displaced the cylinder (74 ) and hence the closure member (44).

Abstract: A hydraulic valve includes a valve body and slide, along with control pieces consisting of two thrust bearings rigidly mounted with a link which is mounted through an axial hole of the slide valve and through the axial holes of the two respective secondary pistons. The slide valve and the secondary pistons are mounted so as to provide an ample gap between the thrust bearings. The secondary pistons, located on either side of the slide valve, delineate two rear chambers which are fed with low pressure fluid. Thus, a gradual displacement of the slide valve is permitted.

Abstract: An automatic dishwasher includes a water inlet line, a flow control valve assembly, a wash water introducing means for introducing wash water into a container which is adapted to receive dishes, and control means for selectively controlling the flow control valve assembly. The flow control valve assembly includes a first flow control valve which is selectively actuated by a first solenoid coil and a second flow control valve which is selectively actuated by a second solenoid coil. A first ferromagnetic member is disposed between a first end of the solenoid coils and a second ferromagnetic member is disposed between the other end of the solenoid coils. The solenoid coils are so interconnected that when an actuating potential is applied across them, they are electrically in series. The series connection of the coils allows the coils to be configured such that a significant saving in the cost of coil wire is achieved over parallel connected coils.

Abstract: An automatic dishwasher includes a water inlet line, a flow control valve assembly, a wash water introducing means for introducing wash water into a container which is adapted to receive dishes, and a control for selectively controlling the flow control valve assembly. The flow control valve assembly includes a first flow control valve which is selectively actuated by a first solenoid coil and a second flow control valve which is selectively actuated by a second solenoid coil. A first ferromagnetic member is disposed between a first end of the solenoid coils and a second ferromagnetic member is disposed between the other end of the solenoid coils. The solenoid coils are so interconnected that when an actuating potential is applied across them, (a) they generate magnetic fields of the opposite polarity, and (b) they are electrically in series.

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: A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to the actuator, pilot operated meter-in valve means to which the fluid from the pump is supplied for controlling the direction of movement of the actuator, meter-out valve means associated with each opening of the actuator for controlling the flow out of said actuator, and a pilot operated check valve operable for controlling flow from the meter-in valve means to one end of the actuator and for preventing flow out the end of said actuator, the pilot operated check valve being operable at a lower pilot pressure than the meter-out valve means and including time delay means such that the valve functions to prevent flow out of the actuator after a predetermined time delay from the time when pilot pressure to said meter-out valve means is interrupted, insuring relief valve protection.

Abstract: The pilot operated valve assembly includes a flexible diaphragm (A) which selectively engages a valve seat (B) to open and close a fluid passage through the valve. The diaphragm has a plurality of filtering apertures 20 and an inward peripheral attaching projection 80. A diaphragm insert (C) is frictionally received in the diaphragm. The diaphragm insert has a pilot supply aperture 74 in fluid communication with a peripheral recess 76 extending inward from a peripheral edge. The diaphragm filtering apertures 20 are disposed in fluid communication with the peripheral recess 76 and the pilot supply aperture 74. The insert peripheral edge has a peripheral valley 82 for receiving the peripheral projection 80 of the diaphragm. The insert has a pilot outlet aperture 66 which is selectively opened and closed by an armature assembly (D). A guide shell (E) aligns the armature assembly (D) with the pilot outlet aperture 66 and defines a pilot reservoir with the diaphragm (A).

Abstract: An idle speed control valve for use in controlling the idle speed of an engine wherein the control valve utilizes a pilot valve to control a valve lift assist force generated by a pressure acting on a differential area associated with the valve. The control valve is actuated in response to a desired speed signal generated by sensed engine conditions as compared to the actual speed of the engine.

Abstract: The invention concerns a valve with servo-command, consisting of a seat (5) and a poppet valve (6) mounted in a valve body (1). Movements of the poppet valve (6) are prompted by the pressure prevailing in the control chamber (7). The intake of fluid under pressure in this chamber (7) takes place through an intake conduit (22) which opens across from the upstream edge of the seat (5) in relation to the direction of flow of the fluid, in proximity to the smallest cross section for passage of the fluid for all the possible positions of the poppet valve in relation to the seat (5).

Abstract: A normally-open two stage float valve for use with a suction tube leading om a vehicle fuel tank. As the fuel tank begins to run dry it is desired that the float valve close off the tank to the suction force. The valve of this invention includes a float-operated pilot valve element that equalizes forces on the opposite faces of the main valve element as the float moves through its actuation stroke. A lifting head is associated with the pilot valve element for mechanically lifting or lowering the main valve element relative to the main seat when the forces have been equalized.

Abstract: A diaphragm for a flush valve is made of molded rubber with a plastic insert for strengthening the diaphragm. The insert includes reinforcing means located at the points where the diaphragm is attached to the valve parts. There is also a plurality of spaced, rigid sections placed between the points of attachment. Connecting means are provided for connecting the reinforcing means and the rigid sections together. The connecting means is arranged to permit flexibility of the diaphragm in two planes. Thus, the diaphragm is permitted to flex both in the plane of the diaphragm and perpendicular to the diaphragm.

Abstract: A system for regulating the flow of a fluid in dependence of an input signal includes a valve housing, a valve between an inlet and an outlet of the valve housing, a cylinder substantially closed off from the cartridge valve housing, and a piston in driving connection with the valve, and movable within the cylinder in opposite directions. A resilient device urges the piston to drive the cartridge valves so as to close the outlet , and a fluid control device communicates with a main fluid conduit and with first and second openings of the cylinder disposed on respective opposite sides of the piston. The valve housing inlet and a source of fluid are connected to the first and second openings of the cylinder, respectively, in a first active station of the fluid switch, but this connection is reversed in a second active station thereof; the first and second openings, and the source of fluid are blocked in a neutral station of the fluid switch.

Abstract: A fluid pressure operated pilot control diaphragm valve having the pilot opened in response to energization of an electromagnetic actuator. The actuator includes a movable armature means operable to open the pilot and stop means movable with the armature for limiting the amount of opening of the pilot. The stop means includes means operative to prevent closing of the pilot when the armature means is subsequently moved by fluid pressure opening of the diaphragm valve.

Abstract: A valve arrangement, especially for controlling flow of hot water through a heating device of a motor vehicle, mainly comprises a closed housing provided with an inlet chamber and an outlet chamber communicating with each other through an opening forming a valve seat, and a valve member movable relative to the valve seat for opening and closing the opening. The arrangement includes further a flexible membrane which is clamped at its outer periphery to the housing and which forms a control chamber at the side of the inlet chamber facing away from the valve seat. The valve member is operated by an electromagnet which acts also on an auxiliary valve member in the control chamber to create during movement of the valve member toward the valve seat a higher pressure in the control chamber than in the outlet chamber and during movement of the valve member away from the valve seat a lower pressure in the control chamber than in the inlet chamber.

Abstract: A pilot controlled, diaphragm actuated valve having simplified construction is provided which is capable of maintaining a variety of valve operating positions. In the preferred embodiment, the valve pin is controlled precisely with respect to the pilot opening in the diaphragm to permit modulation of the diaphragm position. Control of the valve pin is maintained through the use of a power assembly which positions the valve pin in accordance with some sensed system variable. The valve includes structure for reducing instability of the valve over the valve operating range.

Abstract: A limiter for the filling of a tank with any liquid, comprising a hydraulic valve provided with a monitoring obturator connected to a first arm with a first float included in an arm-control assembly of which a second arm with a second float cooperates with said first arm through a stop and pawl arrangement, the position of the first arm controlling said obturator, the latter comprising a diaphragm acting as well under an impulse from said first arm as by a permanent action. The limiter provides for safe filling of a tank between predetermined levels without any water-hammer and overflow.

Abstract: Slow closing faucet control cartridge for removably mounting in a faucet casing. The depression of an operating knob activates the faucet and rotation of the knob permits the mixing of hot and cold water inlets.

Abstract: In a quantity control valve for controlling the quantity of a pressure medium, the valve spindle being axially movably guided in a bush fixedly disposed in a housing and coacting with a nut included in the gear train, the valve spindle also being connected to a position piston slidably adjustable within a sleeve having a control opening, the sleeve being rigidly attached to a valve closure, a compression spring bearing on one side against the housing and on the other side against the valve closure, the valve closure being stepped within the range of its valve seat in defining an annular chamber, a radial connection leading to a central conduit in the valve closure and opening out into a chamber receiving a position piston, a non-return valve in the duct communicating with the control opening, and a pressure medium supply duct connected to the annular chamber about the valve seat.

Abstract: An essential contactless control means is provided for operating a device which mixes and discharges two fluid media such as water faucet for discharging a temperature controlled mixture of hot and cold water. In the case of the water faucet, for example, the hot and cold water flow to the mixing chamber of the faucet is controlled by a pair of magnetic valves, preferably operated by an electronic circuit, which opens the valves when the hand or an object approaches the control antenna of the circuit. In this device, expensive separate additional controls are eliminated by providing the magnetic valves with manually adjustable knobs.

Abstract: An internally piloted shut-off valve for use with cryogenic fluids incorporates a short valve housing with normally closed valve closure means incorporated therein and fluid passages with ports for fluid flow therethrough including an elongated extended stem protruding therefrom on top of which a solenoid operator is received in the stem end opening so as to define a cavity therein housing a large piston interconnected with the valve closure means by an internally piloted concentric tubing disposed coaxially with the stem and, in combination with large piston, comprising valve actuating means which permit the use of conventional solenoid operator and a trickle of cryogenic fluid converted to vapor inside pilot passage of the tubing and supplied to the cavity at atmospheric temperature when solenoid is enerized, creating pressure differential therein capable of maintaining valve open until the solenoid operator is de-energized, allowing valve closing automatically.

Abstract: An automatic flue damper positioned respectively to open and closed positions by means of motive apparatus, such as a solenoid motor, is provided with mechanical means for automatically latching the damper in its open position.

Abstract: A pneumatically operated air lock, comprising in combination a casing one end of which is connected to an air conveying plant, while the other end is provided with an outlet grid, a choke duct arranged in the casing and having an outlet area coincident with the delivery area of the casing, and a membrane positioned within the choke duct, capable of taking an open position wherein the membrane is substantially adherent to one wall of the choke duct, allowing the passage of the air, and a second position wherein said membrane extends across the choke preventing the outflow of the air.

Abstract: A valve member including a flexible diaphragm movable into and out of engagement with a valve seat to close and open the valve, respectively. A rigid support plate rests against the face of the diaphragm opposite the face which engages the valve seat. A stem projects from the plate, through a hole in the diaphragm and into the orifice surrounded by the valve seat. The diaphragm and plate are not rigidly secured together, so that the entire diaphragm is free to flex with respect to the support plate. A pilot passageway may extend completely through the plate and stem. The stem is long enough such that the lower end of the pilot passageway is below the plane of the valve seat even when the valve is open. An abutment, such as an outwardly projecting bead, on the lower end of the stem prevents accidental separation of the plate and diaphragm before they are assembled with a valve.

Abstract: A valve assembly for evacuation of liquids from vessels of the type having a bottom wall provided with an outlet opening has a buoyant piston which forms part of a main valve and is movable to and from a closed position in which a sealing ring of the piston engages an annular seat surrounding the outlet opening. The upper surface of the piston is located below a liquid column in the chamber of a vertically movable housing having a valve member defining with a second sealing ring of the piston an auxiliary valve which is opened in response to depression of the housing to thus connect the chamber with the outlet opening whereby the pressure of the liquid in the chamber decreases. The difference of the pressure between the bottom of the vessel and the chamber pushes the piston upwardly because the effective area of the upper surface of the piston is larger than the effective area of its seat. Such upward movement is enhanced by the buoyancy of the piston.

Abstract: A check valve with pilot actuation for hydraulic systems has a valve housing with a main bore and main seat, a main valve member movable in the main bore between a closed position and an open position and having an additional inner bore with a conical mouth at one end thereof, a pilot valve member movable between a closed position and an open position in said additional bore, and a push rod operative for moving the pilot valve member to the open position thereof. The push rod has a first thinner portion and the second thicker portion forming a shoulder. A conical transitional portion is formed between the above two portions and is complementary to the conical mouth of the bore of the main valve member. The push rod has pressure-relief clearances formed in the region of the transitional portion and the shoulder, and so located that when the transitional conical portion is seated on the conical mouth fluid in said additional bore can pass through the clearances.

Abstract: A fluid pressure operated pilot control diaphragm valve having the pilot opened in response to energization of an electromagnetic actuator. The actuator includes a movable armature means operable to open the pilot and stop means movable with the armature for limiting the amount of opening of the pilot. The stop means includes means operative to prevent closing of the pilot when the armature means is subsequently moved by fluid pressure opening of the diaphragm valve.

Abstract: A temperature controlled valve assembly which comprises a temperature sensor for sensing variation in temperature of a mixed fluid of hot and cold fluid mediums, a proportioning valve member for regulating the amount of flow of the hot fluid medium relative to the amount of flow of the cold fluid medium in such a manner as to increase the amount of flow of the hot fluid medium to be mixed with the cold fluid medium when the temperature of the mixed fluid increases over a predetermined value and to increase the amount of flow of the cold fluid medium to be mixed with the hot fluid medium when the temperature of the mixed fluid decreases below the predetermined value, and a power piston for operating the proportioning valve member.

Abstract: A proportional pressure compensating hydraulic control valve having a valve body and a valve spool mounted in the valve body for movement from a neutral or open center position wherein fluid flows through the valve body to an operating position wherein the flow of fluid through the valve is restricted to direct inlet fluid through a flow control orifice to a pressure passage within the valve body, the pressure passage being connected to one of a pair of cylinder passages, the other cylinder passage being connected to a tank passage. The valve spool in an open center mode controlling the flow of fluid to the control orifice and being pressure compensated to maintain a predetermined flow rate through the control orifice, pressure compensation being achieved by imposing inlet and pressure passage pressures selectively to each end of the valve spool so that the valve spool responds to the pressure differential across the control orifice.

Abstract: A shutoff valve in a line containing fluid under pressure which after being closed is held closed by another fluid under pressure. The other fluid is one such as air which is available at the valve.

Abstract: Flushing valves of the type having a control chamber with a movable wall are disclosed, the chamber being partially emptied to cause the main valve surface and seat to separate and open the valve, and being slowly refilled to close the valve. A cleaning needle is provided which moves in the restricted inlet to the chamber to remove dirt and scale therefrom. In one form, the valve actuating element sequentially lifts a valve closure element, to which the needle is secured, from a seat to open said outlet and thereafter acts on the movable wall part to cause a reduction in the volume of said chamber and force some of its contents through the open outlet. In a further form, the actuating element pressurizes the chamber by forcing the movable wall in the direction which reduces the volume thereof. The increased pressure forces a flexible wall part of the chamber from a sealing surface to allow liquid to flow from the chamber.

Abstract: A power operated valve comprises a valve body having an inlet chamber and an outlet chamber, a movable valve element for selectively controlling a passage of fluid from the inlet chamber to the outlet chamber and an actuator rod for moving the valve element. A solenoid structure is removably mounted on the valve body for reciprocating the rod having a plunger positioned on the same axis as of the rod to be detachably connected with it. A manually operated knob is removably mounted on the solenoid structure for reciprocating the rod having a knob shaft positioned on the same axis as of the plunger to be detachably connected with it.

Abstract: A hydraulic servo valve assembly and a control system therefor employing a pneumatic sensor-actuator are disclosed. The servo valve assembly comprises a servo-operated power valve assembly including a differential piston, a solenoid operated override and hysteresis adjustment. The valve assembly is a "snap-action" device wherein the power valve differential piston is selectively positioned through use of the pneumatic sensor controlled servo valve to vent the pressure applied to the larger area reaction surface of the piston.

Abstract: A valve construction having a housing provided with an inlet and an outlet and a movable valve seat disposed between the inlet and the outlet. A movable valve member is provided for opening and closing the valve seat. A condition responsive unit is operatively associated with the valve member to move the valve member relative to the valve seat in response to the conditions sensed by the condition responsive unit. A snap opening unit is interconnected to the valve seat to rapidly move the valve seat away from the valve member when the valve member has initially opened the valve seat a certain amount.

Abstract: A valve body includes a base section having an inlet and an outlet and means forming a valve seat therebetween. A flexible diaphragm is supported for movement relative to the valve seat and includes a center by-pass port which is opened and closed by a valve member supported for axial movement by a closure section of the valve body. A pin-like actuating lever is pivotally supported by a flexible seal secured to the closure section and has an inner end portion projecting into an opening formed within the valve member. An elongated U-shaped bimetallic actuating element is mounted on the closure section generally parallel to the lever and includes a movable head portion. The bimetallic actuating element is preferably connected as a resistance in series with an electrical load, and a spring is compressed against the outer end of the actuating lever to cause rapid snap-action movement of the lever, and the valve member in response to slower movement of the head portion of the actuating element.