Abstract: An improved water jet pool cleaner system includes a pool cleaner with a buoyant housing powered about the pool by forward and reverse driving nozzles so dirt and other debris is gathered at the low point on the bottom of the pool by the action of depending cleaner hoses. Water from the filter pump enters a fluid reservoir from which it flows along parallel flow paths to the forward and reverse driving nozzles, to a turbine, and to the cleaner hoses. Pressurized water is directed to the forward and reverse nozzles through a rotary valve which is rotated by the drive train connected to the turbine. The parallel flow paths permits water to be provided to the driving nozzles, to the turbine and to the cleaner hoses at pressures substantially equal to the fluid reservoir pressure. The system uses a flow diverter downstream of the main pool filter to divert the proper amount of water to the cleaner. Manual and automatic flow diverters and a novel in-line filter are also disclosed.

Abstract: A commutator feeding device for a demand valve, comprising a transducer adapted for controlling the movement of a shutter element for feeding predetermined quantities of air into a chamber of said demand valve in response to a pressure variation taking place inside said chamber, said transducer being activated following the shifting of a deformable membrane. The device comprises a spring, disposed inside a small piston, adapted for resting on said membrane, said small piston being provided with radial stakes or spokes, each one of which is adapted to rest on the active surface of a corresponding helicoidal profile cam, with manually operable actuating means being predisposed for controlling the rotation of said small piston around its own axis, and hence the axial shifting of the small piston itself in the spring-compressing sense.

Abstract: The invention relates to a two-position switching valve having hydraulic f-holding properties and comprising a closure piston disposed in a flow path for displacement between an open position and a closure position for controlling a pressure between a maximum value and a minimum value, and operatively coupled to a control piston mounted for displacement in a housing. In known switching valves of this type, a creeping approach of respective switching points is scarcely avoidable under certain operating conditions.

Abstract: A combination gladhand and dirt protection plug includes a gladhand body with a chamber within the body. There are a pair of air ports in communication with the chamber, with one of the ports functioning as an air inlet. A seal is positioned in one of the air ports and there is a dirt protection plug movable in the chamber toward and away from the seal to open and close said one port. A spring is positioned within the body to bias the plug toward a port closing position. The plug has a surface in communication with the air inlet, with air pressure at the inlet, applied to the plug surface, causing the plug to automatically move against the spring and away from the seal to an open position.

Abstract: A pressure-relief valve has a housing forming a chamber extending along an axis and a valve seat centered on the axis and subdividing the chamber into an outer high-pressure compartment and an inner low-pressure compartment. The seat defines generally the only fluid-communication path between the compartments. A pump and a load can be connected to the high-pressure compartment and a sump to the low-pressure compartment. A valve body is formed with a central radially outwardly open main groove, an outer face exposed in the high-pressure compartment, an inner face exposed in the low-pressure compartment, a radially outwardly open control groove offset axially inward from the main groove toward the inner face, and a diametrally throughgoing control bore at the main and control grooves.

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 diaphragm and exhaust valve for an underwater breathing apparatus second stage regulator are combined to conserve breathing gas during all orientations of the diver, to provide smooth operation of the diaphragm without interference from exhaust bubbles, and to provide unrestricted exhaust flow. In addition, the diaphragm and exhaust valve are fabricated and installed as a single component.

Abstract: A ball valve is turned relative to its seat by means of three concentric sleeves mounted within a housing bore. Pins carried by the middle piston sleeve extend outward into slots in an outer carrier sleeve and inward into cam grooves in the outer wall of an inner drive sleeve. Axial movement of the middle sleeve under hydraulic pressure causes turning movement of the inner sleeve which then drives through bevel gears to turn the ball valve. The parts are constructed so that hydraulic forces within the housing acting to hold the ball valve in closed position against its seat are substantially balanced by forces in the opposite direction acting against the outer sleeve. A hold-open tube may be passed through the opening in the ball valve, to come to rest upon a choke sleeve.

Abstract: A relief valve assembly for use in backflow preventers having at least one check valve, the relief valve assembly being operable in response to changes in differential pressure across the check valve and in fluid connection downstream of the check valve for discharging liquid therefrom to atmosphere when a backflow condition occurs. The at least one check valve prevents backflow from a service pipe to the supply pipe but when the at least one check valve is fouled, and a backflow condition occurs, the relief valve assembly operates to permit the discharge of the liquid from the service line and prevent contamination of the supply line.

Abstract: A pressure-limiting valve for hydraulic fluids comprises a stepped switching piston which is loaded by a closing spring to oppose high fluid pressure obtaining in an inflow duct of the valve. Radial transverse bores branch from an axially-extending bore in the switching piston. When the setting pressure established by the closing spring is exceeded, the transverse bores in the piston move past an O-ring seal as the piston compresses the spring, and pressure fluid thus flows from the axially-extending bore into a discharge duct of the valve. The stepped switching piston is guided in a pressure chamber by a portion of its cross-section which is greater than that in the zone of the O-ring seal. Adjacent the inflow duct, the axially-extending bore in the piston has a reduced flow cross-section. Further radial bores lead from the axially-extending bore in the piston in the region of the stepped portion of the latter.

Abstract: A system for maintaining a predetermined average liquid level in a pool comprises a pilot valve responsive to a float in the pool and a main valve controlled by the pilot valve to unblock a normally blocked supply conduit when the liquid in the pool drops below that level. The pilot valve, when opened by the float, lets incoming liquid under pressure--branched off the supply conduit at a point upstream of the main valve--enter a compartment under a membrane in the body of the main valve, that membrane carrying a control rod connected with a movable plate which coacts with a stationary plate obstructing the supply conduit inside the valve body; the two plates have apertures which are normally offset from each other but register upon pressurization of the membrane to give passage to the incoming liquid.

Abstract: The present invention comprises a valve body (24) with an inlet (28) and an outlet (30), and an inlet-closing poppet (32) moveably disposed within a chamber (26) in the valve body, the poppet incorporating a piston head (34) whose face (36) opposes the inlet and from which projects a plug (62) for closing-off the inlet (28) from the remainder of the piston face (36) when the poppet is at its inlet-closing position. A spring (54) urges the poppet towards its inlet-closing position with sufficient force to keep the inlet closed until the fluid reaches a preselected cracking pressure, whereupon the spring allows the poppet to be displaced slightly, exposing the remainder of the piston face to the fluid. The action of the fluid on the piston face is then sufficient to drive the poppet fully back to an annular stop (60) provided within the valve body whose engagement also serves as a partial seal about the periphery (70) of the piston.

Abstract: A diaphragm for a scuba diving regulator incorporates a contact member in the form of an axially thin spool cast or fabricated of low friction material. The contact member is installed at a central aperture of the diaphragm so that the end plates or flanges of the spool closely encompass the diaphragm on opposite sides. One of the flanges is located on the outside of the diaphragm, and the other is located on the inside, to be engaged by the actuating lever of the demand valve. No special sealing means need be provided about the spool, since the pressure difference between the ambient water and the air in the breathing chamber is always small, whatever be the depth of the diver in the water, but effective to maintain the seal.

Abstract: This scuba regulator second stage includes the following improvements:(a) a diaphragm assembly using a pair of generally conical flexible diaphragms facing each other and clamped together about a portion of their periphery, the unclamped peripheral sections flexibly spreading apart to function as an exhaust valve;(b) a "detune button" which prevents inadvertent turn-on of the breathable gas supply valve during unattended use of the regulator, and which is automatically disengaged when the user begins to breathe through the regulator;(c) a case configuration in which the breathable gas inlet tube is situated very close to the regulator mouthpiece so as to minimize the torque loading on the teeth of the user as the user's head is turned;(d) a unitary valve configuration in which the entire breathable gas flow valve assembly is removable from the regulator case as an integral unit, without the use of tools;(e) a valve poppet configuration which prevents tilting of the poppet when the breathable gas flow control

Abstract: A first and second stage breathing gas regulator having a first stage redundant piston assembly with a first piston encompassing a second piston. In the eventuality the first piston fails, the second piston provides regulated gas. A safety alarm is provided when a pre-established pressure drop occurs, signalling a decrease in breathing gas by opening to provide gas to drive an audio alarm. The second stage regulator has a balanced second stage that operates with a valve lever in operative relationship to a diaphragm. A hand wheel and cammed valve permit the bypass of breathing gas around the valve of the second stage regulator when required. The outlet of the second stage regulator is provided with a trap door cover to avoid dirt and debris being introduced to the second stage regulator when a hose is not connected thereto.

Abstract: A flow-regulating valve, with a body forming a flow channel between an entrance port and an exit port, has a shutter in the form of an apertured backing plate and an apertured slide which adjoin each other along a plane inclined or parallel to the axis of at least one of these ports so as to be accessible, for inspection or repair, through a neck with an opening offset from both ports but normally closed by a cover. The ports can therefore be formed by nipples rigid with the valve body, e.g. welded thereto, not requiring disconnection from their conduits. The slide is shiftable by a rod extending parallel to the aforementioned plane, specifically horizontally when the valve is controlled by a float in an adjoining tank. In order to isolate the interior of the tank from the flow channel during repairs, a thruster in the tank can be manually operated from the outside to move the rod into a limiting position in which the passage traversed by that rod is plugged.

Abstract: A reversing valve for a combination meter, including a closure element, movable in the axial direction, which is provided with a cylindrical closure ring which in the closed position of the reversing valve covers radially outwardly directed valve openings, and having at least one channel extending essentially axially associated therewith, which channel is closed in the closed position though already after slight shifting of the closure element in the direction of its open position communicates the working chamber of a hydraulic adjustment member with the main flow. The working chamber additionally has a presettable opening which is always open in the direction of the auxiliary flow or total flow. The effective-pressure-cross section of the closure element is suddenly enlarged inwardly during opening, and is reduced in a sudden manner during closing, by having the main flow act on the working chamber.

Abstract: A safety valve intended to limit the pressure of a fluid contained in a vessel to which the valve is connected by a nozzle closed off by a flap-valve pressed against its seat by a spring acting on a first side of the flap-valve. The valve has two operating states; either the flap-valve is closed when the fluid pressure in the vessel acting through the nozzle on the opposite or second side of the flap-valve is below a pre-determined value or the flap-valve is open allowing fluid from the vessel to escape via an escape chamber in the valve when the pressure in the vessel is above the pre-determined value. A casing surrounding the spring is connected with the escape chamber by calibrated holes whereby the pressures in the casing and chamber are equalized. In addition to the spring, fluid pressure in the chamber acts on the first face of the flap-valve. When the flap-valve is closed, the fluid pressure in the escape chamber and casing is low.

Abstract: A diaphragm (40) for use in an exhalation valve (20) in a respirator. The diaphragm is tapered in thickness to provide substantially reduced vibration and noise. The diaphragm flexes and peels up from its valve seat (32) to provide the improved operation at low flow rates through the valve.

Abstract: A demand regulator for use in underwater breathing employs a longitudinally movable tubular valve member having a transversely opening outlet orifice which is moved relative to the breathing port of the regulator as the valve member is moved axially between the fully opened and fully closed positions.

Abstract: An improved control valve for double-acting piston and cylinder asemblies is disclosed in which pressure for actuating a regeneration valve to direct hydraulic fluid from the contracting side of the piston to the expanding side, is controlled by a cylindrical check valve apparatus (86-112) which surrounds the valve plunger and controls the pressure of fluid flowing from the contracting side to the reservoir.

Abstract: An irrigation system flushing valve comprising a housing, a coupling inlet of said housing for coupling to an end of an irrigation line, a flushing valve outlet of said housing, a valve seating formed in said housing communicating with said inlet and with said outlet, valve obturating means juxtaposed with respect to said seating and displaceable with respect thereto from a sealing position wherein said inlet is closed with respect to said outlet to an open position wherein said inlet communicates with said outlet; an extensible membrane mounted in said housing and defining with said obturating means a valve enclosure located within said housing and sealed with respect to said outlet by said obturating means and flow restricting means effecting flow communication between said inlet and said valve enclosure; the arrangement being such that the hydraulic pressures in said valve enclosure and said inlet respectively act on opposite surfaces of said obturating means and when the hydraulic pressure in said valve e

Abstract: The valve includes a disk (8) one side of which is subjected to the action of an adjustable thrust unit and the other side of which is applied against a seat (3) connected to the pressure source of said hydraulic installation, the thrust unit (12) being constituted by an adjustably pressurized deformable chamber. The valve is used in particular for protecting hydraulic installations e.g. water pipes against accidental overpressures, e.g. water-hammer.

Abstract: The leak detection system includes a leak detection sensor for sensing the pressure of fluid product in a supply line and holding the flow rate of the fluid through the supply line to a value below a maximum when the sensed pressure is below a predetermined value. The sensor is connected to the supply line in proximity to a pump. A pressure responsive valve is connected in the supply line between the sensor and a dispensing nozzle for sensing pressure and stopping the flow of fluid product through the line when the pressure is below a minimum value. The pressure responsive valve allows the line pressure to build to a value sufficient to allow the sensor to complete its sensing cycle and permit full fluid flow.

Abstract: This scuba regulator second stage includes the following improvements:(a) a diaphragm assembly using a pair of generally conical flexible diaphragms facing each other and clamped together about a portion of their periphery, the unclamped peripheral sections flexibly spreading apart to function as an exhaust valve;(b) a "detune button" which prevents inadvertent turn-on of the breathable gas supply valve during unattended use of the regulator, and which is automatically disengaged when the user begins to breathe through the regulator;(c) a case configuration in which the breathable gas inlet tube is situated very close to the regulator mouthpiece so as to minimize the torque loading on the teeth of the user as the user's head is turned;(d) a unitary valve configuration in which the entire breathable gas flow valve assembly is removable from the regulator case as an integral unit, without the use of tools;(e) a valve poppet configuration which prevents tilting of the poppet when the breathable gas flow control

Abstract: A ball valve is turned relative to its seat by means of three concentric sleeves mounted within a housing bore. Pins carried by the middle piston sleeve extend outward into slots in an outer carrier sleeve and inward into cam grooves in the outer wall of an inner drive sleeve. Axial movement of the middle sleeve under hydraulic pressure causes turning movement of the inner sleeve which then drives through bevel gears to turn the ball valve. The parts are constructed so that hydraulic forces within the housing acting to hold the ball valve in closed position against its seat are substantially balanced by forces in the opposite direction acting against the outer sleeve.

Abstract: A control valve automatically regulating the flow of gas fuel to the inlet of a gas fuel compressor to maintain the pressure in a gas fuel line, leading to an appliance, above a minimum predetermined level.

Abstract: A pressure-responsive valve operable to close when the pressure falls below predetermined minimum level. After closure, the valve must be manually reset to its open position where it is retained by the pressure of the fluid against a diaphragm positioned within a chamber adjacent the valve. When used in conjunction with a oil-fired boiler, the valve prevents boiler flareback by closing when the pressure falls below a predetermined minimum level and by requiring a monitored, manual reopening, thereby preventing undesired ignition.

Abstract: A fuel dispensing nozzle having an aspirator valve which closes an aspirator line when there is a high negative or positive pressure in the fuel tank being filled, the closing of the aspirator line decreasing pressure in a chamber so that a shaft is released whereby the nozzle automatically shuts off. The nozzle also has a poppet valve controlled with the fuel valve of the nozzle, which poppet valve seals a vapor return line through the nozzle when the fuel valve is shut off.

Abstract: A tilt valve incorporated in a demand regulator for breathing apparatus has a head which seats over an opening through which the valve stem extends for operation by a pressure-responsive diaphragm. This opening defines the outlet port of a chamber wherein the valve head is disposed, the inlet port of the chamber opening to the same side of the valve head as the outlet port. Gas flowing from the inlet port to the outlet port therefore need not pass between the periphery of the valve head and the surrounding wall of the chamber, so that the head can be a close fit in the chamber to ensure a consistent seating of the head over the valved port.

Abstract: A vacuum pump is connected through a vacuum line to the milking apparatus, and a pressure regulator is employed to admit into the line the amount of ambient air necessary to maintain line pressure constant within narrow limits. The pressure regulator comprises a rolling-sleeve air valve to control the admission of ambient air, and which is itself controlled by a bias spring and an opposed diaphragm. One side of the diaphragm is subjected to pressure generally equal to line pressure, whereas the other side is subjected to the pressure of air within a dome. Means are provided to admit into the dome sufficient air to maintain dome pressure constant. Means are also provided to bleed air through the diaphragm, thus maintaining substantially constant the pressure drop thereacross. The air valve is constructed with a deflecting skirt which prevents false sensing of line pressure.

Abstract: Pressure acting on the face of the poppet valve is opposed by a gas charge or a spring in the bellows. The valve controls evaporator pressure in an automotive air conditioning system. Destructive response to pressure pulses from the compressor is prevented by the static friction obtained by having a leaf spring bear on opposed sides of a self-lubricating plastic sleeve carried on a shaft fixed on the valve. The various modifications show ways of minimizing the effect of temperature change through the valve and minimizing the differential of the valve. One modification provides a temperature responsive charge in the bellows and the mean effective area of the bellows is greater than the mean effective area of the valve orifice to compensate the closing force and reduce the valve differential.

Abstract: A pressure-relief valve device, especially for use with hydraulic props, has a main hollow housing containing a guide piece with a through bore in which a cylindrical shank of a valve or piston member is received. The shank is slidable within the guide piece bore and is held, by a spring force applied to a head thereof, in a closed position. The shank has a blind axial bore leading through five, or preferably six radial borings to outlets at is periphery. An O-ring held in a groove in the wall of the guide piece bore engages on the peripheral surface of the shank. An elastic deformable thrust disc is located in the groove and contacts a wall of the groove adjacent the head of the valve member as well as the O-ring. The thrust disc serves to prevent creep of the O-ring during use whereby excess fluid pressure acts to displace the valve member against the restoring force of the spring to move the outlets of the shank of the valve member passed the O-ring to allow pressure-relief.

Abstract: The invention contemplates a valve having particular application to the control of flow and pressure within a sanitary-sewer system which includes independently pumped feeders at elevations below an intervening region of greater elevation. The valve, located at the downstream side of the region, of greater elevation, and below the elevation of pumping on the upstream side of the region of greater elevation, provides (a) such a minimum level of pressure at its inlet as to assure against syphoning liquid sewage out of the greater-elevation region, (b) a reduction in hydraulic-head pressure for liquid sewage passed by the valve to the succeeding downstream region of lower elevation, and (c) such balanced response to excessive downstream-region pressure development as to prevent any development of upstream flow through the valve, i.e., such balanced response as to prevent changes in upstream pressure level with fluctuating downstream pressure level.

Abstract: A differential-pressure valve is described including a valve passageway formed through a fixed wall and closable by a valve member displaceable by a differential-pressure sensor biassed to close the valve passageway and subjected to the differential pressure such that the higher pressure tends to open the valve passageway and the lower pressure tends to close the valve passageway.

Abstract: A diaphragm for a dosaging valve in which one side of the diaphragm is exposed to the surrounding environment and the other side is exposed to a respiratory or breathing gas, comprises, a central layer or insert which is coated on both sides and an outer layer overlying the insert and facing the surrounding medium which comprises a silicone elastomer and an inner layer overlying said insert and facing the interior of the housing and exposed to the breathing gas which comprises a polypropylene oxide rubber.

Abstract: This scuba regulator second stage includes the following improvements:(a) a diaphragm assembly using a pair of generally conical flexible diaphragms facing each other and clamped together about a portion of their periphery, the unclamped peripheral sections flexibly spreading apart to function as an exhaust valve;(b) a "detune button" which prevents inadvertent turn-on of the breathable gas supply valve during unattended use of the regulator, and which is automatically disengaged when the user begins to breathe through the regulator;(c) a case configuration in which the breathable gas inlet tube is situated very close to the regulator mouthpiece so as to minimize the torque loading on the teeth of the user as the user's head is turned;(d) a unitary valve configuration in which the entire breathable gas flow valve assembly is removable from the regulator case as an integral unit, without the use of tools;(e) a valve poppet configuration which prevents tilting of the poppet when the breathable gas glow control

Abstract: An integrated valve device includes a base board means and control valve means mounted thereon for an exhaust gas purifying system. The control valve means is provided at its outer surface with a pair of fingers adapted to be inserted into openings on the base board means. The fingers engage therefore with shoulders of the openings when mounted on the base board means.

Abstract: An inside blowout preventer well tool includes an elongated body threaded at both ends and including an axial opening. A flapper is pivotally mounted on a side of the opening and movable between a lower-open position and an upper-closed position. A downwardly-facing valve seat is formed around the opening, the flapper engaging the seat in the upper-closed position. A spring urges the flapper toward the seat and a piston is movable in the opening between an upper position, where the lower end of the piston is above the valve seat, and a lower position, where the piston encases the flapper and holds it in the lower-open position. The piston is normally urged toward its upper position, the piston being shaped so that when the internal pressure of drilling mud normally circulating through the opening is greater by a predetermined amount than pressure outside the body, the pressure differential will overcome the force urging the piston upwardly and move the piston to the lower position.

Abstract: A pressure modulating valve 28 has a principal use for retrofitting into an original hydraulic system (10) to modulate the fluid pressure from a source (11) of hydraulic fluid to hydraulic clutches (50, 52) in a transmission (54). In prior art valves, the routing of hydraulic fluid from the original system to the valve involved the connection of many lines. The present invention is connected to the source (11) at only one location and discharges fluid to the clutches from said location. The valve (28) is operated by the fluid provided at the one location without the need to route fluid around the valve (28) to the various components thereof. The valve (28) also modulates the fluid supplied to the clutches from a low pressure to a high pressure to provide smooth clutch engagement.

Abstract: A valve device for pressure-relief of, e.g., hydraulic props of mine equipment, has a main hollow housing into which a guide is in screw threaded engagement for adjustment purposes. The guide has a through bore which slidably receives the cylindrical stem of a valve member. The valve member has a domed head with a stop face held against an inner end face of the guide by means of a compression spring located in the housing and bearing on a thrust bushing guided and located on the head of the valve member. The stem of the valve member has a blind axial bore leading to frusto-conical outlets at its periphery via radial borings. The axial bore in the stem receives pressure fluid to be controlled via the guide bore. A sealing ring held in a groove in the guide bore engages on the periphery of the stem of the valve member.

Abstract: A pressure control valve assembly for controlling the fluid pressure in an external fluid circuit at a predetermined or required pressure equal to or smaller than the set pressure comprises a valve housing having a movable valve seat member supported therein for axial movement relative to the valve housing, a valving member having a valve or poppet element normally seated against the movable valve seat member and closing a discharge path, a primary biasing spring for biasing the poppet element against the movable valve seat member and a set pressure adjustment exerting an axial pushing force on the movable valve seat member. By the operation of the set pressure adjustment, the valve assembly can be set to operate at a required pressure and in this condition, the movable valve seat member is held in a state of equilibrium.

Abstract: A regulator for underwater diving having an improved first stage wherein the bias of the coil spring is varied by changing the relative position of the piston seat which can be readily accessed. The second stage of the regulator is capable of satisfying the human breathing demand with the use of a linkage ratio adjustment feature which coupled with the selection of the proper angle for the housing of the diaphragm permits the amplification and faithful tracking of the diver's breathing cycle. Also, exhaust means has been provided to facilitate the purging of extraneous fluids from the regulator in the most common positions of the diver. The above mentioned features, in combination, will provide a perfect match of the first and second stages of the regulator.

Abstract: A valve adapted for installation at the lower end of a drilling kelly for closing the bore of the kelly when adding a section of drill pipe so that the mud content of the kelly is not discharged onto the derrick floor; the valve also being adapted with minimum change in parts, to be inverted and installed at the upper end of the kelly to serve as a safety valve, providing blow out protection.

Abstract: A valve structure for cleaning purposes extends at least with part of its housing through a hole in a wall to be cleaned. Outlet nozzles in the housing extend so as to direct a cleaning medium substantially in parallel to or at a slight angle relative to the surface to be cleaned. The nozzles are so arranged that substantially a circle is covered by the resulting flow pattern. A valve closure is normally biassed into a nozzle closing position and may be lifted off the valve seat by the pressure of the cleaning medium flowing through the valve structure.

Abstract: A regulating valve for dividing a flow of fluid into a plurality of equal flows, wherein a pressure responsive member is positioned in a casing in communication with inlet pressure fluid, and a movable valve member with a plurality of equal size openings therethrough is connected with the pressure responsive member for movement therewith and is positioned in operative association with a plurality of outlet openings in the casing, whereby when the pressure responsive member is moved by inlet pressure fluid, the valve member is moved accordingly to open or close the outlet openings and thus obtain a plurality of equal, regulated flows through the plurality of outlets.

Abstract: An improved adjustable relief valve is provided having a valve body with a valve body inlet and outlet disposed therein. A reciprocating plunger is disposed in said valve body, and is movable between a first closed position isolating said valve body inlet and outlet, and a second open position communicating said valve body inlet and outlet. A pilot valve means is operatively associated with said plunger to control the flow of fluid from said valve body inlet to said plunger. Both said plunger and said pilot valve means have adjustable spring means for urging them toward their respective closed positions. An auxiliary means is provided for opening said relief valve without varying the adjustments of said spring means, so that said relief valve may be purged with a cleansing fluid.

Abstract: A fluid control valve actuated by a biased diaphragm responsive to fluctuating pressure in the flow area of the valve to control the valve under conditions of high pressure or reduced pressure. A secondary safety diaphragm is provided separated from the controlled fluid, usually a hydrocarbon, to insure that a breach of a primary diaphragm will not permit leakage to atmosphere.

Abstract: A fluid system (10) has a shutoff valve (13) positioned between a fluid tank (11) and the intake side of a pump (12). The valve (13) includes a valve spool (21) movable between a first position at which an inlet port (18) connected to the fluid tank (11) is blocked from communication with an outlet port (19) connected to an intake side of the pump (12) and a second position at which the inlet port (18) is in communication with the outlet port (19). A passage (26) connects the outlet port (19) to a first chamber (23) at one end of the valve spool (21) while a port (27) connects the discharge side of the pump (12) to a second chamber (24) at the opposite end of the valve spool (21). A spring (29) resiliently urges the valve spool (21) to the first position.

Abstract: A fuel feed system having a fuel tank and a pump for pumping up fuel from said fuel tank and for feeding the same to a combustor, characterized in that there is provided between said fuel tank and said pump, a negative pressure actuating valve which is closed against fuel pressure in said fuel tank but opened by a negative pressure created by said pump.