Abstract: A flush control valve (10) for metering a predetermined amount of flush fluid, or other liquid, to a facility, such as a urinal, to be flushed. The flush control valve (10) has a push button cap (166) that is actuated to cause the primary valve assembly (33) to open and distribute the flush fluid from the inlet chamber (35) of the flush control valve (10) to the outlet chamber (36) of the flush control valve (10). Depressing the push button cap (166) activates a timing assembly (109), the interior working components of which do not come in contact with the flush fluid controlled by the flush control valve (10), thereby eliminating corrosion to that critical portion of the valve (10). The timing assembly (109) is pneumatically operated and is effective through a diaphragm (108) to actuate a pilot valve assembly (83) which controls the opening and closing of the primary valve assembly (33).

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: A vacuum security valve includes a buffer volume in a movable piston. The movable piston has two orifices communicating with the buffer volume, the first orifice communicating with a clearance volume above the piston. A flexible diaphragm is connected to the piston for separating the clearance volume from the remainder of the interior of the valve body. Another orifice, disposed to communicate with the remainder of the interior of the valve body rather than with the clearance volume, is provided in the piston wall, and also communicates with the buffer volume. A solenoid operated valve, which is normally in the opened position, communicates through the valve body with the clearance volume, and also communicates with a vent. The security valve is connected at one port to a vacuum system which is to be protected upon power failure of a vacuum pump. The other port of the security valve is connected to the lines leading to the vacuum pump.

Abstract: A solenoid-operated pilot valve of the diaphragm type which includes an assembly for controlling the flow of liquid through the valve. The valve has particular although not exclusive utility for irrigation purposes. The valve includes a diaphragm chamber into which fluid is introduced to establish a fluid pressure which normally forces a diaphragm against an annular seat in the valve to assist a spring in maintaining the valve in a closed condition. A stationary bleed tube is provided which extends through the diaphragm into the diaphragm chamber. A solenoid is mounted on the cap of the valve, and the plunger of the solenoid normally closes off the upper end of the bleed tube. However, when the solenoid is energized, the plunger is withdrawn and the bleed tube opens and drains the diaphragm chamber sufficiently to reduce the pressure therein to a point at which the diaphragm is forced off its seat by upstream fluid pressure, and the valve is opened.

Abstract: A valve for delivering a metered flow of liquid for flushing of a plumbing fixture or the like includes inlet and outlet ports and a main valve controlling flow from the inlet to the outlet port. A control chamber is in pressure communication with the main valve and a restricted flow path from the inlet port to the control chamber increases the control pressure to hold the main valve closed in a standby condition. A pilot valve is opened by an actuator to reduce control pressure and initiate a cycle of operation of the main valve. A snap acting mechanism is movable between two stable positions for opening and closing the pilot valve. The actuator is capable of operating the snap acting mechanism for opening the pilot valve in its fully opened position closes the pilot valve regardless of the position of the actuator.

Abstract: A device that maintains the water level of a swimming pool within acceptable limits. The device includes a valve member that has a valve chamber and a diaphragm chamber. The valve member is held in submerged relation to the water level in the pool by a weighted member that is provided with a stabilizer so that the correct position of the submerged valve member is maintained at all times. A garden hose is connected at one end to a source of water under pressure and its other end is connected to the valve chamber. One side of the diaphragm is exposed to the water in the pool and its other side is exposed to atmospheric pressure so that when the pool level changes, the change is detected by the diaphragm. An on-off valve in the valve chamber is normally closed so that a valve at the water source may be left in its open position at all times.

Abstract: A rolling diaphragm regulator valve is affixed in a globe type valve body and includes a non-stretchable fabric reinforced liner for covering and uncovering, by rolling action in response to changes in pressure in a control chamber, a plurality of slots in a baffle positioned between the valve body inlet and outlet. An axially movable spring-biased nose cone, mounted behind the diaphragm, provides a surface over which the diaphragm is draped for controlling substantially all movement of the diaphragm. A travel indicator is operable by movement of the nose cone to provide a visual indication of the position of the valve.

Abstract: A valve which opens on reduced pressure comprises: a hollow body (1) divided into first and second portions (2 and 3) by an internal partition (4), with the first portion being provided with a first opening (5) for connection to an enclosure to be evacuated and with a second opening (6) for connection to the aspiration side of a vacuum pump; a moving valve plate (7) disposed inside the first portion; a spring (8) urging the valve plate to close the first opening; a rod (10) having one end connected to the valve plate and passing through the internal partition; and a piston (b 11) which is connected to the other end of the rod, and which divides the second portion into a first chamber (13) and a second chamber (14) which are sealed from each other, the first chamber being on the rod side of the piston and being in communication with the outside (19), and the second chamber including an orifice (22) for communication with the outside, which orifice is fitted with closure means (23), the second chamber further i

Abstract: A bleed screw is built into a solenoid actuator used to control a diaphragm controlled valve so that the valve can be opened manually by means of the bleed screw or remotely or automatically through use of the solenoid. Both the bleed screw and the solenoid actuator are configured to relieve diaphragm pressure maintaining the valve normally closed so that either or both can open the valve.

Abstract: A fill valve for controlling liquid level in a toilet water tank or other tank includes a valve head assembly positioned at a selected level in the tank by a telescoping riser assembly with liquid inlet and outlet conduits extending toward the tank bottom. An adjusting nut on a stationary riser engages thread structures on inlet and outlet conduits for raising or lowering the valve head assembly and adjusting the liquid level. A main valve in the head assembly is controlled by a non-horizontal diaphragm separating a vent chamber and a control chamber. The control chamber is pressurized as liquid rises to the selected level by a standpipe extending downwardly in the tank. The valve closing and opening levels are offset by partly filling the vent chamber with liquid when the main valve is open to hydraulically load the diaphragm. A vacuum breaker valve obstructs backflow through the valve, vents the flow path when the valve is closed, and regulates flow into the vent chamber when the valve is open.

Abstract: A pneumatically amplified conservation valve controls a flow of gas, such as oxygen, to a hospital patient. A sense tube monitors pressure variations as a result of exhalation by the user. The exhalation pressure variation deflects a diaphragm which closes a check valve that serves to vent gas through a bleed port. When the check valve closes the bleed gas is restricted in a chamber which deflects the diaphragm which in turn drives a connector that pushes a plunger to close a port that is connected to the source of gas through a supply tube. The gas is normally supplied through the supply tube and a normally open pneumatic valve to an output tube and then to the user. The pneumatically amplified conservation valve provides gas to the user except when the user is exhaling thereby substantially saving the amount of gas that must be provided to a user.

Abstract: A ballcock assembly having an upright standpipe for delivery of flush water, a control valve assembly at the upper end of the standpipe, and a float and ballast assembly slidably mounted for up and down movement relative to the standpipe and connected to the control valve assembly. The control valve assembly operates to open the valve to flow of flush water from the standpipe assembly in response to downward movement of the float and ballast assembly. When the float assembly is caused to rise by incoming flush water from the standpipe, it ultimately causes the control valve to shut off incoming flow of flush water from the standpipe.

Abstract: An apparatus for controlling the flow of liquid from a conduit into a tank to maintain a selected level, which is an improvement on the conventional type of float-operated flow valves which use a diaphragm clamped between two flanges and positioned over the end of the conduit through which liquid is supplied at a selected pressure. There is a small opening in the center of the diaphragm and there is a second small opening in the second flange of the flow means. The improvement of this invention, is the use, instead of a float mechanism, a pressure-sensitive diaphragm which is responsive to the hydrostatic pressure in the liquid at the level of immersion of the diaphragm. The diaphragm is adapted to close and open the second small opening, and thus to control the flow through the first valve.

Abstract: A pilot-operated ball cock valve of the type wherein a vent to a pressure chamber is controlled by a lever arm to thereby control the flow of fluid through the valve. A movable rod is slidable in aligned relief and pilot conduit openings and has a valve sealing element carried on the rod. The valve sealing element is adapted to seal off the relief opening in one position of the rod and to open the relief opening in another position of the rod. Further, the sealing element is adapted to close off the pilot conduit between the pressure chamber and the inlet opening when the rod is in the other position. The valve is advantageously formed in two pieces which screw together through a threaded core. The float on the arm has a hole in an outer portion thereof and is rotatably mounted on the arm to adjust the buoyancy of the float and thereby adjust the height to which the arm will rise in the tank.

Abstract: A liquid flow control valve having a valve seat and a valve plug for engaging said valve seat, said plug being connected to a pressure responsive device, such as a diaphragm, for movement therewith, said control valve being opened and closed by forces acting on opposite sides of said diaphragm, an anti-syphon valve located below said diaphragm for directing air into said flow control valve when a suction occurs at the inlet to said valve seat; said anti-syphon valve comprising an annular array of flaps which control the flow of air through openings in the body of said liquid flow control valve. Said flaps can be arranged to also provide a barrier to reverse flow from the liquid flow control valve exit through said valve seat to its inlet. Said liquid flow control valve can be of the pilot valve operated type or manually operated.

Abstract: A solenoid-operated pilot-actuated valve is provided of the diaphragm type which has particular utility for irrigation purposes. The valve also finds industrial utility where it is desirable to control large amounts of flow energy with a small control signal. The valve includes a diaphragm chamber into which fluid is introduced to establish a fluid pressure which normally forces the diaphragm against an annular seat in the valve to maintain the valve in a closed condition. A stationary bleed tube is provided which extends through the diaphragm into the diaphragm chamber. A solenoid plunger normally closes off the upper end of the bleed tube. However, when the solenoid is energized, the plunger is withdrawn and opens the bleed tube, the diaphragm chamber is drained sufficiently to reduce the pressure therein to a point at which the diaphragm is forced off its seat by the upstream fluid pressure, and the valve is opened.

Abstract: An improved metering valve, or flush valve, incorporates a rolling diaphragm mechanism of a cylindrical elastromeric material providing a smoothly transitioning flow rate control from the full open to the full close position. The rolling diaphragm sealing means is actuated by a floating cup driven by the differential pressure between the valve fluid inlet and an intermediate actuation control chamber. The valve control is spring biased to the normally closed position and is actuated by dumping all fluid from the control chamber through a poppet mechanism which is triggered mechanically through a sealing diaphragm. Upon dumping fluid from the metering chamber, the actuating cup is compressed by the pressure of the inlet fluids to roll the diaphragm to a substantially open position.

Abstract: A shut-off valve includes a valve stem or actuating member operatively connected to a pressure-responsive apparatus. The pressure-responsive apparatus is acted upon by fluid in a pressure chamber such that the valve mechanism is held open to permit fluid flow therethrough. A spring or biasing means is provided that automatically closes the valve mechanism whenever the pressure chamber is evacuated or depressurized such that the pressure-responsive apparatus can no longer maintain the shut-off valve in an open position.

Abstract: A non-chattering, float-controlled, pilot-operated diaphragm valve for controlling the flow of liquids from a conduit under pressure to a tank where the surface is in turbulent condition. The lightweight float and pilot valve follow the relatively high frequency fluctuations of level and the diaphragm valve responds causing a rapid opening and closing of the main flow through the conduit into the tank. The chattering is eliminated by the insertion of operative means between the float closure means and the movable diaphragm. A small diameter rod of selected length is positioned between the diaphragm and the closure means so that when the main flow through the conduit starts, the movement of the diaphragm away from the conduit forces the pilot valve to open and submerge the float to a considerable depth.

Abstract: An irrigation control system includes a rotary water motor which receives water from a valve, which has either a full on or a full off condition, depending on the alignment of an associated irrigation line. A pilot valve which is not susceptible to being clogged by contaminants that can be found in the water actuates the valve to the on or off position for controlling the water motor.

Abstract: A float operated valve for controlling the rate of flow of water from a pipe carrying water under pressure, to a vessel, comprises a pipe having an end opening of selected diameter and a flange of larger diameter surrounding the pipe. A flexible diaphragm is attached over the flange having a central closure pad adapted to cut off water flow when pressed against the pipe. A small orifice is drilled through the diaphragm so that when the flow is shut off, water can still flow through the orifice to the second side of the diaphragm. A second short pipe having a similar flange is bolted against the diaphragm to the first flange, to provide a water tight seal. There is a second small orifice in the second end of the second pipe, and a float mechanism is provided with a closure tip to close the second orifice when the water level is at a selected value. The closure tip provided can vary the size of the second orifice so that as soon as it is opened, the orifice size is a minimum.

Abstract: An improved flushing device is disclosed for use in tanks such as are used for flushing toilets. The flushing device has an inlet means including an improved two-stage valve which uses inlet line pressure in operating each of the two stages. A float is movably mounted on an inlet fixture for use in controlling the tank filling operation with a lever operatively coupling the float to the first stage of the valve. A vertical hollow overflow tube including a bowl filling aperture cooperates with a liquid operated variable buoyancy means on the float and alternatively a tube connects the inlet means with an overflow tube.

Abstract: A valve comprising a valve housing having a flow passage extending through the valve housing and a cavity communicating with the flow passage, a valve seat in the flow passage, a diaphragm extending across the cavity to define a control chamber on one side of the diaphragm and a valve element for controlling the flow of fluid through the flow passage. The valve element is mounted for pivotal movement about primary and secondary pivotal axes. The opening and closing of the valve element is controlled by the pressure in the control chamber.

Abstract: A diaphragm operated valve including a valve housing having a passage extending therethrough with an inlet and an outlet and a cavity communicating with the passage. A diaphragm extends across the cavity to define a control chamber on one side of the diaphragm. The other side of the diaphragm communicates with the passage. A passageway in the valve housing leads to the control chamber so that the pressure in the control chamber can be varied. A diaphragm support having an opening therein is mounted in the cavity to support the diaphragm, and a vlave element is pivotally mounted within the valve housing for cooperation with the valve seat. The valve seat forms an acute angle with the axis of the passage through the valve housing to minimize pressure losses.

Abstract: Improvements are disclosed for a float valve of the type including a main valve that controls an inlet port, a control chamber having a bleeder port and a pilot valve member unitary with a float to control the bleeder port and thereby adjust pressure in the control chamber for regulating actuation of the main valve. In order to increase the float cycle of the valve, a water reservoir is formed by the float for receiving water and increasing weight of the float while the valve is actuated during each float cycle, the reservoir including vent means for emptying the reservoir when the valve is deactuated in order to then reduce the weight of the float. Additional improvements are provided to facilitate operation of the valve.

Abstract: A pilot valve is described for control of a pulse valve for e.g. production of pulses of compressed air. The pilot valve comprises a housing having an inlet and an outlet, a movable valve element disposed inside the housing, and means for switching said valve element between a closed and an open position, said inlet and outlet communicating in the open position. At least a portion of the interior of the housing presents in one plane a circular shape, the outlet being formed as a radial slot from this portion around at least a part of the periphery. The valve element is designed as a flexible disc which in the closed position is located in said plane to seal the slot with its outer edge at the inner side of the housing. Said means are arranged to switch the valve element to the open position by giving the disc a curved shape so that the outer edge no longer covers the slot.

Abstract: The valve comprises a flap controlled in function of the pressure prevailing in a chamber limited by the flap in accordance with an escape circuit being opened or closed by an electro-magnet. The inlet of the escape circuit comprises a filter operatively mounted on the flap to be movable therewith, and the passage cross-sections of the escape circuit are greater than the biggest impurities able to pass through the filter.

Abstract: A valve for controlling fluid flow in a fluid system such as a pipeline which includes a body defining an internal chamber in fluid connection with an inlet and an outlet. The valve further includes a deformable valve liner mounted within the chamber which sits against a valve seat and a frustoconical grill having a plurality of ports therein. The liner and the body define a control chamber which is coupled to a source of controlled pressure. A relief region is provided between the liner and the grill at the plane of intersection of the liner and the grill.

Abstract: A metering apparatus for controlling the rate of closure of a pressure-actuated valve of a type normally used in irrigation systems. When a pressure-actuated valve is closing, fluid from a supply line must flow into a pressure-actuating chamber, gradually filling it to force the valve's plug member against its seat. The metering apparatus is a compressible spring through which fluid must flow to enter this pressure-actuating chamber. As the valve closes, it compresses the spring through which the fluid must flow, thereby restricting the rate of flow into the pressure-actuating chamber. This reduction in flow reduces the rate at which the valve's plug member approaches its seat in an exponential manner, allowing rapid closure at first which is reduced considerably as the plug approaches its seat.

Abstract: A main valve diaphragm closes the liquid inlet to the tank when the latter is full because ballast members associated with a pilot valve have their gravitational effects negated as a result of liquid in the tank being above or at substantially the same level as such members, thereby allowing the buoyancy of a float to maintain the pilot valve closed. On the other hand, when the liquid in the tank drops to a predetermined level, the ballast members become effective to gravitationally operate the pilot valve which in turn releases hydraulic pressure in a chamber above the diaphragm that otherwise keeps the diaphragm seated.

Abstract: A valve is provided for controlling fluid flow between the inlet and outlet of a closed valve housing. A stationary insert body in the housing includes a through channel with cross channels extending transversely therefrom. The latter open on the inner side of an expansible U-shaped ring which surrounds the periphery of the insert body and is spaced from the wall of the valve housing. A piston is movable to close the outlet of the through channel so as to increase the pressure in the cross channels and cause expansion of the ring to close off the passage around the insert body between the inlet and outlet.

Abstract: A normally-open pilot-operated valve assembly is provided which closes when a solenoid-operated pilot valve is energized. The pilot valve is open when the solenoid is de-energized to remove fluid pressure from a chamber in the valve housing causing the main valve to open. When the solenoid is energized, the pilot valve closes causing hydraulic pressure to build up in the valve chamber so that the main valve is closed. The solenoid-operated valve includes a plunger which extends into a discharge port, the plunger having a spherical member attached to its distal end which is drawn inwardly against a seat in the pilot discharge port to close the port when the pilot solenoid is energized.

Abstract: A fill valve for controlling liquid level in a toilet tank or other tank includes a housing with an inlet, an outlet, a valve, and a level sensing mechanism for opening the valve to permit flow when the liquid level is below a predetermined value. A flow impedance path including a compact array of many baffles defining multiple consecutive right angle turns dissipates fluid pressure without substantial velocity increases and consequent cavitation and noise. Stable valve closure when the predetermined level is reached is effected by the mounting and configuration of a valve control lever. The fill valve may be disassembled for service without removal from the tank. A coupling and mounting nut assembly facilitates mounting without tools in a variety of tanks. A backflow preventer including few simple parts may be incorporated to provide redundant cross-connection protection.

Abstract: A pilot operated ball cock valve for controling the height of fluid in a tank. The rotary pilot valve has an inlet port and an outlet port which are interconnected and communicate with a fluid channel which bypasses an evacuation chamber and a diaphragm valve permitting fluid to flow directly to the inlet port of the rotary pilot valve. The outlet port of the rotary valve is positioned by a predetermined fluid height in the tank into alignment with a fluid channel which transmits fluid pressure into a pressure chamber above the diaphragm. Such positioning allows fluid pressure to act upon the diaphragm which closes a discharge orifice thereby preventing flow of fluid into the tank. A decrease in fluid height in the tank induces the rotary pilot valve to rotate such that the outlet port will move out of alignment with the fluid channel leading into the pressure chamber.

Abstract: A pilot type diaphragm valve assembly is provided which includes a solenoid-operated pilot valve which may be opened to remove fluid pressure from a chamber in the valve housing causing the main valve to open, and which may be closed to cause a buildup of hydraulic pressure in the valve housing causing the main valve to close. The solenoid-operated pilot valve includes an outlet which may be coupled to a reservoir at atmospheric pressure, or to any other suitable receptacle, to make the pressure differential across the diaphragm within the valve independent of pressure differentials in the fluid flow through the valve so as to obviate instability at low flow rates.

Abstract: A shutoff valve installed on the discharge side of a pump to automatically shutoff hazardous liquid flow in the event of a rupture on the downstream side of the shutoff valve. The shutoff valve operates in response to a predetermined pressure drop across a valve and may also function to stop the driver of the pump and close the shutoff valve in response to excessive temperature conditions. Various installational arrangements may be provided in order to associate the shutoff valve with the hazardous fluid flow line.

Abstract: An improved pilot operated valve which may be used in fluid control systems which may have one or more latching unit for controlling the valves. The valves utilizing a concentric arrangement of the major components thereof, each being coaxially located with respect to a single housing member. These major components include the valve closure member, the pilot valve, the diaphragm separating the high and low pressure areas, and the latching actuator controlling the pilot valve. A mounting flange member is provided for threading into a valve body, and is in turn threaded to the valve body member so that the entire valve assembly may be rotated much like a conventional valve handle to provide a flow control, and a manual shutoff if desired. The control electronics may be battery operated and may locate with respect to one valve to provide drive signals to control one or more valves in sequence. Other controls and actuators may be used.

Abstract: A flow control valve of the type in which flow through the valve is controlled by means of a diaphragm which operates by differential pressure on its opposite faces to move between open and closed positions with respect to the flow path through the valve. In this type of valve an aperture is formed through the diaphragm to place its opposite faces in communication with the pressure existing in the flow path through the valve and a metering rod extends through the aperture in the diaphragm to meter flow through the aperture and maintain it free of foreign material. The metering rod in the valve of the present invention is mounted so that it can move about one of its ends to allow it to accommodate non-uniform movement of the diaphragm and prevent binding of the metering rod in the diaphragm aperture.

Abstract: A system for controlling liquid flow from an inlet into a tank comprising a normally closed poppet valve controlled by dual pressure chambers each containing a diaphragm movable by the pressure of the liquid in the inlet to cause the valve to close. Pressure against the diaphragms is relieved by bleed passages extending from the chambers which are closed by dual solenoid operated closing mechanisms. Actuation of either one or both of the mechanisms can open the bleed passages.

Abstract: There is disclosed a liquid level control valve ideally suited for water closets and the like that employs a submersed liquid pressure responsive diaphragm as an actuator for the control valve. The control valve is supported in the tank on a liquid inlet vertical column, above the normal, controlled liquid level thereon. The control valve has a flexible valve closure member that subdivides the control valve housing into main and secondary chambers. A small orifice provides liquid communication through the diaphragm between the chambers and the secondary chamber is provided with a bleed orifice in the housing wall with a closure member therefor carried on an actuator arm which is mechanically coupled through a vent pipe to the diaphragm actuator.

Abstract: An actuating valve serves as a pilot to a control valve for a valve controlled flushing system for a tank-type toilet installation which comprises a siphon flush valve, and a control valve that allows supply water to flow into the tank to initiate siphonic action, to supplement flow through the siphon flush valve and to refill the tank, which control valve utilizes a piston which is ordinarily seated in a closed position by supply line pressure. The actuating valve is located in a bypass passage between the supply pressure and a timing pressure chamber of a control valve.

Abstract: A float controlled valve has a chamber and a first diaphragm forming a part of the chamber walls; a passage admits liquid from the valve inlet to the chamber; a second diaphragm forms a further part of the chamber walls and has a bleed-off passage which may be closed by action of the float; pressure build up in the chamber acts on the first diaphragm to close the valve; the pressure build up also acts on the second diaphragm to deflect the bleed off passage and so depress the float below the liquid surface when the valve closes; a sharp pointed and reduced diameter entrance to the passage at the valve inlet reduces blockage likelyhood; a helix on the float actuated means for closing the bleed-off passage provides facility for adjustments.

Abstract: A vacuum safety valve comprises a closed cylindrical valve body having one end connected to a system to be evacuated, and a tube extending from the side wall to a vacuum pumping system. The other end of the valve body includes a port connected to ambient air through a solenoid operated valve which is normally open when de-energized. An extendable bellows is secured about the port on the inside of the valve body, and the distal end of the bellows is sealed by a plate having a small bleed hole in the edge thereof. Should the pumping system fail, the solenoid valve is deactuated to open the bellows interior to ambient air. The air pressure expands the bellows and drives the plate against the interior port to seal off the system side of the valve before the vacuum therein is destroyed.

Abstract: A valve for controlling the level of water in a toilet flush tank includes a body and cover having interfacing surfaces defining a valve chamber and a diaphragm chamber. A valve seat in the valve chamber communicates with a water inlet by way of a projection integral with the body adapted to extend through the flush tank water inlet opening to mount the housing in a normally submerged position. A diaphragm is held in the diaphragm chamber between the cover and body, and a flexible valve member is held in the valve chamber between the cover and body. An air passage defined in part by the projection vents the diaphragm chamber to atmosphere through the flush tank floor, and liquid pressure is communicated through the cover to the opposite side of the diaphragm. The water inlet passage extends to the center of the valve seat, which is surrounded by a valving surface having a number of segment shaped outlet ports communicating with water outlet passages in the valve body.

Abstract: A valve having a valve body formed with an internal orifice between the valve inlet and outlet ports, and a main valve member for opening and closing the orifice. A chamber above the valve member is supplied with high pressure fluid through a bleed passageway extending between the chamber and the inlet port. A pilot valve controls exhausting of the chamber when the main valve is to be opened. A flow control element in the bleed passageway maintains a constant rate of fluid flow for filling the chamber, to close the main valve, regardless of the pressure differential across the flow control element. The bleed passageway may be in either the valve body or the main valve member. The flow control element may be an annular rubber washer.

Abstract: A control chamber of a float valve is formed in part by a diaphragm which is integral with an elastomeric main valve member that opens and closes the supply port of the float valve. A small tube to supply water to the control chamber is mounted in the main valve member and extends upward through and beyond the supply port. The upper end of the small tube tapers to an inlet opening that is sufficiently restricted to keep large solid particles out of the control chamber. The control chamber has a lower bleeder port which is controlled by a fixed upright pilot valve member on a float. A hood integral with the bottom wall of the control chamber extends downward to form a float chamber enclosing the float, the hood having ample vent ports for siphon prevention. Water is discharged from the bleeder port into an expansile chamber, the outlet of which is sufficiently restricted to cause the expansile chamber to depress the float thereby to increase the volume of water released on each float cycle.

Abstract: A valve assembly comprises a body having an inlet and an outlet, a chamber between the inlet and the outlet, a valve diaphragm fitted in the valve body and attached to a rigid closure member adapted to close the inlet with the periphery of the diaphragm supported by a wall of the chamber, and an auxiliary control, or pilot valve communicating with the chamber, said diaphragm comprising an annular member of rubber-like material with a thin outer peripheral portion and a thickened inner portion.

Abstract: A diaphragm-type irrigation valve having a molded plastic body, and including a metal valve-seat ring with sidewalls embedded in the plastic body. The seat ring has a generally U-shaped cross-section, at least one ring sidewall being non-parallel to a central axis of the ring. An O-ring seal is positioned within the ring to bear against the plastic material in which the sidewalls are embedded.

Abstract: The present invention deals with a bag diaphragm comprising one or more flattened extremely flexible bags assembled together, to be mounted between rigid plates at a variable mean distance and to be inflated in operation by a variable pressure difference, and with an air damper operated by means of a bag diaphragm as mentioned above, this air damper being suitable for air conditioning plants, in constant flow, or constant variable flow, or mixing appliances, in fresh air and return air ducts, where an air flow is to be controlled, the operation of the air damper being possible without any electrical or pneumatic energy supply system, due to the particular characteristics of the aforesaid bag diaphragm and particular design of the damper.

Abstract: An improved metering valve, or flush valve, incorporates a rolling diaphragm mechanism of a cylindrical elastomeric material providing a smoothly transitioning flow rate control from the full open to the full close position. The rolling diaphragm sealing means is actuated by a floating cup driven by the differential pressure between the valve fluid inlet and an intermediate actuation control chamber. The valve control is spring biased to the normally closed position and is actuated by dumping all fluid from the control chamber through a poppet mechanism which is triggered mechanically through a sealing diaphragm. Upon dumping fluid from the metering chamber, the actuating cup is compressed by the pressure of the inlet fluids to roll the diaphragm to a substantially open position.