Abstract: A fuel system supplying fuel to an internal combustion engine of a vehicle. The fuel system includes an integrated pressure management system managing pressure and detecting leaks in the fuel system. The integrated pressure management system also performs a leak diagnostic for the headspace in a fuel tank, a canister that collects volatile fuel vapors from the headspace, a purge valve, and all associated hoses and connections.

Abstract: An integrated pressure management system manages pressure and detects leaks in a fuel system. The integrated pressure management system also performs a leak diagnostic for the headspace in a fuel tank, a canister that collects volatile fuel vapors from the headspace, a purge valve, and all associated hoses and connections.

Abstract: A pressure operable device for an integrated pressure management apparatus. The pressure operable device includes a poppet moving between a first configuration permitting fluid communication between first and second ports of the integrated pressure management apparatus, and a second configuration preventing fluid communication between the first and second ports. A spring biases the poppet toward the second configuration, and a diaphragm operably engages the poppet to move the poppet toward the first configuration.

Abstract: An integrated pressure management system manages pressure and detects leaks in a fuel system. The integrated pressure management system also performs a leak diagnostic for the head space in a fuel tank, a canister that collects volatile fuel vapors from the head space, a purge valve, and all associated.

Abstract: A pressure relief valve for relieving excess pressure in a fluid distribution system comprising a valve body having an inlet port and an outlet port in communication with an interior of the valve body. The inlet port is connectable to the fluid distribution system. A valve member within the interior of the valve body is movable between a closed position to prevent fluid flow through the body and an open position to permit fluid flow. The valve member is exposed to a first opening force exerted directly by the pressure in the fluid distribution system. There is a movable piston/diaphragm member co-operating with the valve member such that the piston/diaphragm is exposed to the pressure in the fluid distribution system to provide a second opening force for the valve member. A biasing system exerts a default closing force to move the valve member to the closed position. The closing force is set to be equivalent to a pre-selected pressure in the fluid distribution system.

Abstract: A gas operated lantern includes a regulator having a simple mechanism allowing a user to start or stop the flow of gas through the regulator. The regulator preferably exhausts an air/gas mixture in the same direction as which gas enters the regulator. The regulator includes a diaphragm assembly which presses down on a valve assembly to open the valve assembly. A stem enters the regulator and is turnable by the user to raise the diaphragm assembly and thus cause the valve assembly to close. The lantern also includes an automatic choke. The choke is preferably a strip of metal located in the burner tube of the lantern which acts to close off a portion of the burner tube when the lantern is cold, causing the air/fuel mixture to become richer and thus easier to light. As the lantern heats up, the choke straightens to open the burner tube, allowing a greater flow of air through the lantern and causing the air/fuel mixture to become leaner and thus raising the efficiency of the lantern.

Abstract: A regulator valve has a housing with a seal member therein. First and second plungers are movable in the housing toward and away from the seal member. The plungers are sealed to the housing and have passages therethrough. The plungers are biased toward the seal member by fluid pressure at the housing outlet end. The plungers are biased away from the seal member by a spring. First and second diaphragms connected to the plungers engage the housing inner wall in sealing engagement so that fluid must flow through the passages. The diaphragms and housing define an expansion chamber. A port in fluid communication with the expansion chamber allows selectable introduction of pilot pressure into the expansion chamber to force the first plunger into engagement with the seal member and prevent flow through the passages.

Abstract: A gas stream monitor shall be provided that facilitates the adjustment of the reseat flow. The gas stream monitor consists of a gas-tight casing whose interior is equipped with a seat for a reseat body that is movable inside the casing and is kept in open position against the flow direction by weight and/or spring force, in which the flow cross-section, surface area of the reseat body and the forces are determined in such a manner that gas stream monitor leaves its open position at a defined value of the reseat flow and is moved towards the seat of the casing, so that the gas conduit is closed in the shut position, and has outside the casing at least one manipulator to adjust the spring pre-tension and/or the stroke of the reseat body. The gas stream monitor serves to automatically shut off gas conduits upon the occurrence of an inadmissible flow increase due to, e.g. a damaged gas conduit or a defective consumer.

Abstract: A pressure regulator for supplying water to a poultry watering system or the like includes a control assembly for operating the pressure regulator in a normal or “on” mode, an off mode or a flush or bypass mode. A desired operating pressure is set by loading a diaphragm responsive to output pressure changes. Diaphragm movement is transferred by the control system to a valve member cooperating with an inlet orifice. The control system includes a spring captured in a preloaded state between first and second end members, one connected to the valve member and the other connected to the diaphragm. A knob is rotated from a normal “on” position to an off position and a collar pushes the end members together and pushes the valve member against the orifice. The knob is rotated to a flush or bypass position and the collar pulls the end members together and pulls the valve member away from the orifice. The inlet orifice and an inlet port are parts of a removeably mounted inlet member.

Abstract: The flow control valve (10) has a body (11) and a valve mechanism (40). The body defines a chamber (20). The chamber involves an inlet (12) for receiving fluid to control, a valve seat (16) for passing the fluid, and an outlet (15) for discharging the fluid. The valve mechanism consists of a valve plug (41) for opening and closing the valve seat, a first diaphragm (50) arranged in the vicinity of the inlet, and a second diaphragm (60) arranged in the vicinity of the outlet. Each of the diaphragms is in the chamber and has a periphery fixed to the body. The diaphragms divide the chamber into a first pressure chamber (21) outside the first diaphragm, a valve chamber (25) between the diaphragms, and a second pressure chamber (30) outside the second diaphragm. The valve chamber includes the inlet, valve seat, and outlet.

Abstract: A simple ammonia tool bar throttle valve is disclosed which is primarily for use with those systems which will utilize a stripper pump unit to increase the ammonia system pressure prior to the metering devices. The ammonia tool bar throttle receives the metered ammonia at a greater pressure than that of the system storage tank, and enters a lower chamber where it crosses a filter before exiting the unit across a throttle orifice which is throttled by the action of an aluminum throttle diaphragm which separates the lower chamber from a control chamber. The aluminum throttle diaphragm is positioned to maintain the desired mass flow by the forces of a separately regulated ammonia control fluid which is throttled to the control chamber before being bled back to the storage tank across an orifice.

Abstract: A fluid control device is disclosed which is capable of permitting flow through the fluid control device in response to a control signal and in response to a predetermined high pressure. The fluid control device includes a valve body having a first end, a second end, and a bore extending between the first end and the second end. A plurality of inlet ports extend from the valve body into the bore. A moveable sleeve is located within the bore and includes a check valve seat. A valve rod extends from the first end of the valve body into the sleeve and sealingly engages the check valve seat. The sleeve and associated check valve seat is moveable out of sealing engagement with the valve rod in response to a predetermined pressure within the inlet ports. In addition, the valve rod can be moved out of sealing engagement with the check valve seat in response to actuation of a solenoid armature that is in contact with the valve rod.

Abstract: A gas feed system is disclosed for supplying a gas such as chlorine to a water system for chlorinating the water. The gas feed system includes multiple containers and provides for automatic switching over from one container to a second container once the first container is empty and such that the first container can be completely emptied. The invention also includes a gas feed regulator for controlling the supply of gas from a container such as a chlorine cylinder, the regulator having a simplified construction.

Abstract: An apparatus for exercising an emergency shutoff valve of a steam turbine and methods for installing and operating the same. A frame of the apparatus mounts on top of an emergency shutoff valve body and spans the axis of a valve stem of the emergency shutoff valve. A plunger is suspended from the frame and connects to the top of the valve stem of the emergency shutoff valve. The emergency shutoff valve, which is biased to spring closed, is held in place by the apparatus. With the valve thus secured, the tripping mechanism for the emergency shutoff valve can be disconnected from the valve stem and exercised, tested, or serviced. Additionally, the valve stem can be moved or exercised to assure its operability and to dislodge deposits or corrosion from the valve stem. Movement of the plunger is limited by retainer means that restrict movement of the plunger relative to the frame.

Abstract: A fluid pumping apparatus (10) includes a soft start valve (16) coupled with the outlet of a pump (14) driven by an electric motor (12) for reducing the startup current of the motor (12). The preferred valve (16) includes a fluid chamber (32), a valve operator in the nature of a ball (22) shiftable in the chamber (32) between the inlet (36) and a valve seat (48), and a biasing assembly (24) including an axially shiftable rod (54) and a spring (56) for biasing the rod (54) against the ball (22) in order to bias the ball (22) toward the chamber inlet (36). Upon startup, the valve (16) provides a reduced start pressure, less than the pump pressure under load, at the inlet (36) as the operator (22) moves toward the seat (48). The chamber (32) presents a volume sufficient for the valve (16) to provide the start pressure long enough for the motor (12) to achieve synchronous speed, thereby reducing motor startup current.

Abstract: An absolute pressure regulator valve assembly for controlling the absolute pressure (P.sub.C) of a fluid source. The absolute pressure regulator valve assembly includes a hollow housing having an inlet port and a discharge port. The inlet port is in fluid communication with the fluid source. The discharge port is associated with a valve seat. A bellows assembly is positioned within the housing. The bellows assembly has an open first end and a closed second end. The first end is gas-tight sealed to the housing and is in fluid communication with a means for providing a reference pressure (P.sub.R) within the bellows assembly. A valve closure element is attached to the closed end of the bellows assembly. The valve closure element is positioned relative to the valve seat wherein motion of the bellows assembly provides opening and closure of the discharge port.

Abstract: A portable system of inter-connected smaller and larger canisters for near simultaneous vacuum and liquid transfer free from any external power. Captured vacuum in the canisters is employed for waste liquid extraction and a subsequent pressure transfer may take place without any liquid being exposed to the atmosphere. A mechanical manifold is adapted to receive the canisters, and one or more canisters may be physically connected to the manifold and are left in place as a user drives to another site location. An intermediate canister in the system is fitted with either manual or a self tending valve for the vacuum and pressure modes of the system.

Abstract: A valve for relieving an excess negative pressure condition inside a medical device comprising a diaphragm with an inner periphery and an outer periphery and an actuator having a piston extending axially therefrom which is inserted through the inner periphery of the diaphragm. The piston comprises a plurality of legs that form a void therebetween at the free end thereof. The outer periphery of the diaphragm is sandwiched between the upper and lower housings so as to create a hermetic seal that separates the valve into a venting side and a suction side. To relieve an excess negative pressure condition the diaphragm is operable in one of two positions. In the first position, a biasing members forces the inner periphery of the diaphragm in sealing engagement around the circumference of the piston so that a hermetic seal is maintained between the suction side and the venting side.

Abstract: A high pressure water gun for washing electrical insulators and other related articles, which gun has a barrel, a water inlet, a water outlet (nozzle), a pistol grip and a main body portion, which portion communicates with both the inlet and with a lower valve chamber separated from an upper piston chamber. A piston is vertically slidably mounted in the upper chamber. A check valve is slidably mounted horizontally in the lower chamber and is spring biased, when the gun is in the inoperative position. A port extends between the lower chamber and communicates with the upper chamber. Another port in the lower chamber communicates with the barrel. Water introduced into the inlet follows a dual path and ejects out of the nozzle with relatively little pull required on the trigger.

Abstract: A shut-off valve is mounted between an injection nozzle and a mold. The valve has a piston within the valve body, A material passage is formed through the piston having an exit aperture and a terminal end. When material is injected through the material passage, the piston is forced to a downstream position which allows the material to flow into the mold. A pneumatic pressure applied to the piston forces the piston to a closed position after injection.

Abstract: A fluid control assembly that includes fluid valving, fluid regulation, automatic safety shut-off valving and manual shut-off valving in one assembly, a novel fluid control unit that integrates the above functions in one unit, and a novel ignitor and a novel seal and diaphragm for use in the assembly.

Abstract: A quantity regulation valve for controlling liquids in which a valve member can be moved by an electromagnet, permitting different through flow cross sections to be set so that a high pressure pump that is supplied with fuel via the quantity regulation valve can feed a variable quantity of high pressure fuel. At the same time, the valve member of the quantity regulation valve is equipped with a sealing face that cooperates with a valve seat for the purpose of absolutely preventing the high pressure fuel delivery.

Abstract: A two-way insert valve having an insert assembly which can be installed in a receiving bore hole and having a valve cover for closing the receiving bore hole, the insert assembly consisting of two parts, has a bush with several radial passages and with an axial passage and a ring arranged between the bush and the valve cover and has a valve piston by which a connection between the radial passages and the axial passage can be controlled and which is displaceable in opening direction up to a stop. A closing spring urges the valve piston in closed direction. The valve piston in its closed position is guided by the bush at least approximately up to the first end of the bush facing the ring.

Abstract: A valve is disclosed which is adapted to be disposed between a first chamber and a second chamber for the purpose of selectively interconnecting the two chambers or isolating them from one another. The valve comprises a body, a sleeve disposed therein and provided with a number of orifices which open into a first duct in the body for the delivery of fluid to the second chamber, and a piston which is slidable in the sleeve to close or open the orifices and which separates a feed chamber communicating with the first chamber from a control chamber communicating, by way of a second duct, with the throat of a venturi formed in the first duct. The opposite faces of the piston are thus both exposed to the fluid, and a spring is provided in the control chamber for biassing the piston towards closing the orifices.

Abstract: A breathing regulator for use in underwater breathing comprising a diaphragm and poppet actuated upon user demand. The poppet including at least one baffle located intermediate its ends wherein when air is demanded by a user of the regulator air travels through the valve and continuously impinges upon the baffle and reduces the effort of the user required to operate the valve. The regulator further comprises a sleeve which is concentric about the air passage chamber which facilitates more efficient air delivery to the user. The sleeve is selectively controlled by the user either to enhance the venturi flow of air or to cancel the venturi effect, dependent upon the needs of the user.

Abstract: A valve, especially a thermostatic expansion valve, has a setpoint spring which bears on a plate having a sloping face. A setpoint adjusting device is provided in a housing connecting tube. The adjusting device has a pressure-applying piece having a contact face engaging the sloping face, is secured against rotation and has a threaded bore. An adjusting screw which is supported on the connecting tube against axial displacement engages in this threaded bore. In this construction, the connecting tube requires no machining.

Abstract: An improved check valve for selectively controlling the flow of fluid through a valve seat. A spring biases a plunger against the valve seat when the fluid is stationary. Movement of the fluid pushes the valve plunger against the spring to open the aperture of the valve seat. An actuator selectively exerts a force against the plunger to close the plunger against the valve seat. In one embodiment of the invention, the actuator directs a pressurized fluid against a second end of the plunger, and a seal prevents leakage of such fluid toward the plunger first end in contact with the valve seat. A cavity between the seal and the plunger first end can be vented to the atmosphere to maintain the pressure differential created by the pressurized fluid against the plunger second end.

Abstract: A pneumatic pressure regulator comprised of at least an obturator actuated by at least an elastic membrane comprised of at least an inlet orifice which permits the entry of a fluid under pressure and comprises at least an outlet orifice which permits the exit of a fluid under regulated pressure, characterized by a programmable means (6) which creates a force F on the obturator (2), this force F being defined at the end of a test by varying the value of at least a parameter P of the functioning of the regulator in such a manner that the outer pressure PS=f(P) of the regulator is exactly equal to the value of the predefined pressure PD=f(P) for each value of the parameter P of the operation of the regulator.

Abstract: A wastegate valve for use with turbocharged engines. The wastegate valve vents exhaust gasses upstream of the turbocharger high pressure turbine to reduce turbocharger speed and associated boost pressure. The wastegate valve includes a piston attached to a poppet valve and movable within a housing. The housing receives pressurized intake gasses at a side of the piston to actuate the popper valve between open and closed positions. A diaphragm is sealingly disposed between the piston and housing. The housing includes mechanical stop means to limit the piston travel, thereby reducing flexure of the diaphragm. Additionally, the diaphragm is disposed in the housing in such a way that the diaphragm flexes between reduced peak compressive and tensile stresses.

Abstract: In a constant timing valve for the discontinuous metering of a volume flow, in particular the flow of cooling water flowing through a heat exchanger of a motor vehicle heater, the volume flow flowing through the valve outlet (17) is maintained constant regardless of the magnitude of the volume flow available at the inlet (16) in the valve housing (15) in that a bypass channel (28) is formed which leads from the inlet (16) to a return (18) and is closed by a spring-loaded, pressure-contro led bypass valve (29). The bypass valve (29) is designed in such a way that the excess volume flow flows off via the return (18) when the connection between the inlet (16) and outlet (17) is not blocked, at least after reaching a given minimum pressure in the bypass channel (28). The integrated bypass valve (29) is coupled with the timing valve (14) in such a way it is compulsorily pushed opened by the timing valve (14) when the timing valve (14) is closed (FIG. 1).

Abstract: Disclosed is an improvement to a direct pressure regulator including a timer device, transmission means, and a valve controlling the gas flow. The improvement is characterized in that the transmission means that transmits power from the timer device to the valve includes an indirect transmission member that transmits the power indirectly rather than directly as in the prior art. The structure allows the assembly of the constituent parts of the direct pressure regulator to be much more easily accomplished. No adjustment or calibration is needed after the assembly. Manufacture cost and fault rate are both significantly reduced.

Abstract: A gas flow safety valve assembly having a main housing of generally solid rigid construction with a main interior chamber divided into an upper compartment and a flow through compartment by a primary diaphragm. Further, the main housing includes an inlet passage leading into the flow through compartment and an outlet passage leading out of the flow through compartment. Upon a gas flow pressure within the flow through compartment dropping below a predetermined minimum acceptable gas flow rate, the primary diaphragm is downwardly displaced resulting in the engagement of a primary displacement member connected thereto with a lever element pivotally positioned within the main housing.

Abstract: A hot-water thermoregulating valve is disclosed including a hot-water supply cap; a cold-water supply cap; a main body located between the hot-water supply cap and cold-water supply cap; first and second disks formed with a circular hole on the center, respectively; first and second stems for opening/closing the first and second disks and formed with a smaller-diameter portion inserted into the slide cavity of the first and second protrusions, a taper portion inserted into the hole of the first and second disks, and a larger-diameter portion having a reception hollow; first and second pistons contained in the main body, one end being coupled to the reception hollow of the first and second stems, the other end coming into contact with the damper, and having first and second springs; and a step motor, thereby automatically controlling the temperature of hot water.

Abstract: A solenoid valve for hydraulic brake units with slip control is described which has a magnetic armature (2) surrounded by a valve dome (14), the magnetic armature (2) positioned by energization of a magnet coil (16), so that a valve needle (1) which is carried by the magnetic armature (2) is moved onto a valve seat (3). A hydraulic actuating force is generated by an arrangement causing the valve needle (1) to open even through the solenoid valve is energized causing the valve to act as a pressure relief or limiter valve.

Abstract: A fuel injection control mechanism for use in a fuel system is adapted to be connected between a fuel injection pump and a fuel injector. The mechanism includes a main passage, a chamber, a primary valve connecting the main passage to the chamber, a piston disposed within the chamber, a spring biasing the piston toward the primary valve and an adjustment compartment. A wall separates the chamber from the adjustment compartment, and a removable cap encloses the adjustment compartment. Apparatus is provided for adjusting the biasing force of the spring and travel limits of the piston. Adjustment can be accomplished to vary fluid characteristics in the fuel delivered to the injector without the need to disassemble the mechanism or disconnect the mechanism from the fuel system.

Abstract: A pilot stage for pressure control valves includes an axially displaceable valve piston which bounds a valve chamber axially on one side and includes a valve seat for a closure cone therein. Valve piston has an actuating surface in a pressure chamber that is substantially larger than the free cross section of the valve seat. By pressurization of this pressure chamber, a large hydrostatic force is exerted on the valve piston which opposes the closing force of the pressure-setting spring. A housing stop fixes a first axial end position of the valve piston in the direction of this hydrostatic force. The pilot control stage has improved properties for both manually adjustable pressure control valves and proportional pressure control valves.

Abstract: In a solenoid valve comprising a first solenoid valve for regulating pressure and a second multifunctional solenoid valve integrated with the first solenoid valve, even if a solenoid of the first solenoid valve is energized, a diaphragm valve of the solenoid valve is not immediately opened, thereby providing a safe and compact solenoid valve. The first solenoid valve comprises a first spring provided between the upper end of a plunger which is movable by the solenoid and a stator, while the lower end of the plunger is disposed to be brought into contact with the diaphragm valve and a second spring is provided for urging the diaphragm valve in the direction to close it even if the plunger is moved away from the diaphragm valve and the second solenoid valve which is integrated with said solenoid valve for controlling to selectively open or close a closing valve and a one way valve.

Abstract: A flow rate control valve reduced in size and improved in mountability has a structure comprising a communicating passage which has openings on opposite ends and includes valve seats which surround the respective openings, an outflow port which communicates with an intermediate portion of the communicating passage, a first valve disk disposed at a corresponding position to one of the valve seats, a diaphragm connected to the first valve disk, a diaphragm chamber formed on one side of the diaphragm, a spring which urges the first valve disk in the valve closing direction, a second valve disk disposed at a corresponding position to the other valve seat, an electromagnetic solenoid which opens/closes the second valve disk, a valve chamber formed around the second valve disk, and an inflow port which communicates with the diaphragm chamber and the valve chamber.

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: A vacuum valve for use in a tanker is constructed with means (11, 12, 13, 33, 35, 36) for applying a supplemental closing force to the valve body if the pressure drop across the vacuum valve rises substantially above a value designated for the vacuum valve. Such an extraordinary rise of the pressure drop will occur by escapage from an injury under the waterline caused by grounding, and the supplemental closing force will therefore close the valve very fast and will thereby contribute to maintaining a high vacuum in the tank, counteracting continued escape.

Abstract: An improved vaporization system includes an automated valve and positive displacement pumping system using a pair of pumps operating in opposition to one another to provide continuous and constant volumetric flow at a constant predetermined pressure to an improved vaporizer using a stack of heated disks to flash vaporize the liquid. The valves are improved by providing one way flow.

Abstract: A positive pressure demand regulator having a housing with a connection for delivering breathing gas with an outlet connected to the housing for attachment to a mask. A diaphragm is mounted in the housing and a passage connects the outlet and the diaphragm so that the diaphragm can be in fluidically connected relationship to the outlet. A main valve interconnects the breathing gas connection to the outlet for valving breathing gas to the outlet. A cam is attached to the diaphragm for lifting the diaphragm into an inoperative mode with a detent connected to the cam operated by a cam rod engaging a cam surface to lift the detent into a position for placing the detent in displaced relationship from where the diaphragm is in an operative mode, mounted in the housing on the side of the diaphragm opposite from the outlet.

Abstract: Disclosed is a valve assembly in which a valve is actuated by a flexible high pressure hose in cooperation with a commonly attached linkage. The valve assembly is attachable between a fire hose and a source of high pressure fluid. The assembly allows a user to open the valve to the high pressure fluid source from a remote location.

Abstract: A bistable pneumatic valve assembly has a valve containing a flange and is adapted to be associated with a combustion chamber of an internal combustion engine. A control outlet opening of the valve assembly housing is opened for responsively causing the valve to both open and close for controlled passing of fluid from the valve assembly.

Abstract: The present invention provides an automatic monitoring and shutoff system for utilities which allows the user to set the system to permit certain uses of gas or water without triggering the shutoff, depending on whether the user is home or away, and is able to provide for specific usual or unusual uses.

Abstract: A cartridge valve assembly is slidably and sealingly receivable in a recess therefor in the housing of a pressure regulator for supplied air breathing apparatus. The cartridge valve is preassembled and slidably inserted as a unit in the pressure regulator housing recess, and the body is provided with an external shoulder engaged by a headed fastener in the housing to retain the cartridge valve assembly in the housing recess. The cartridge comprises a cylindrical body having a bore therethrough in which a valve stem is slidably supported for a valve element thereon to open and close the bore at one end thereof providing an air outlet for the valve. An air inlet port opens radially through the body into the bore, and the outer surface of the body carries O-ring seals on axially opposite sides of the air inlet port which sealingly engage the cartridge recess. The end of the body opposite the air inlet pivotally supports a valve stem actuating lever arm.

Abstract: A valve for controlling intravenous fluid includes a flexible membrane (11), which together with a rigid body (21) forms a valving chamber (29). Two mouths (27, 32) lead into and out of the valving chamber. In one embodiment, a stem (23) having an enlarged portion (15) is attached to the membrane's inner face and extends into the outlet mouth. Fluid pressure on the inner face causes the enlarged portion of the stem to press against a narrower portion (38) of the outlet conduit, thereby preventing flow through the outlet conduit. External pressure on the membrane's outer face causes the enlarged portion of the stem to separate from the outlet conduit's walls, thereby permitting flow through the outlet conduit. In another embodiment, a groove (43) is placed near one of the mouths. The membrane may be pressed against the rigid body and the groove, so as to prevent flow except through the groove and to variably restrict flow through the groove.

Abstract: A fuel pressure regulator controls the pressure differential across a nozzle which is subject to variations in exhaust gas backpressure having a solenoid actuated valve member which is actuable in response to signals from a controller to establish a predetermined fuel pressure across the nozzle consistent with a control strategy. A pressure dependent valve actuator is operable on the valve member, independently of the solenoid, to adjust the valve opening and, as such, the fuel pressure at the nozzle to adjust the fuel pressure in response to exhaust gas.

Abstract: An air valve having a runaway control feature, including a movable piston which is insertable into air blocking position in a valve passage, a diaphragm separating two chambers, one chamber being coupled to the air passage upstream of the movable piston and the other chamber coupled to the air passage downstream of the movable piston, a rod movable by the diaphragm to activate a second air valve, the second air valve controlling the flow of air from the air passage upstream of the piston valve to the piston valve itself, thereby forcing the piston valve to move into air closure position in the passageway when the pressure drop upstream and downstream of the piston valve exceed predetermined limits. The invention includes a test feature which includes a third valve for manually unbalancing the air pressure across the diaphragm chambers to simulate the runaway air flow condition and thereby actuate the piston valve closure.

Abstract: A gas valve having a main valve closure member carried by a first diaphragm biased to close the main valve, the first diaphragm being exposed on opposite sides to gas supply pressure and to pressure in a control chamber. The control chamber is connected to the main valve outlet through a normally closed control valve, whose position is primarily determined by an electromagnetic voice coil, in series with a normally open control valve, whose position is primarily determined by a second diaphragm exposed to the valve outlet pressure.