Abstract: Each gas expansion station of a distribution network fed with gas in accordance with the invention comprises at least one regulator-expander provided with a valve member disposed on a main duct, a pilot valve, a safety valve provided with a valve member disposed in the main duct, and a differential member co-operating with the pilot valve and the safety valve which is disposed upstream from the regulator-expander to close the safety valve automatically under the control of the pilot valve in the event of the downstream pressure in the main duct downstream from the expansion station concerned exceeding a predetermined threshold value, and to operate automatically, after the downstream pressure has been restored to below the predetermined threshold value, either to reopen the safety valve if the regulator-expander of the expansion station concerned is not itself giving rise to a leak at its valve member, or else to keep the safety valve closed if the regulator-expander is not itself providing gastight sealing a

Abstract: A fluid flow control valve, comprising: a housing having an inlet connectable to a source of pressurized fluid, an outlet connected to the inlet via a connecting passageway, and a valve opening in the connecting passageway; a valve member movable to an open position and to a closed position with respect to the valve opening; and an actuator for actuating the valve member to its open and closed positions; the actuator including a control chamber which is expansible by receiving a quantity of fluid from the housing inlet and which is contracted by discharging the quantity of fluid from the housing via the housing outlet, whereby repeated operations of the valve repeatedly flush the control chamber with fresh fluid from the source of pressurized fluid.

Abstract: The invention relates to a sanitary safety device which is interposed in a water-supply line and there is insertable in an opening in the region of a coupling point or joint. It is characteristic of the sanitary safety device according to the invention that the sanitary safety device has a flow regulator (2) or similar restrictor as well as a backflow preventer (3), these being combined in the sanitary safety device to compose a constructional unit in the form of a cartridge (1). Such is insertable for example, in the opening of a recess in the form of a cartridge mount provided in a hose connector. The cartridge (1) composed of the flow regulator (2), backflow preventer (3) and any strainer attachment (8) at the inflow end can thus be interposed in a water-supply line in a simple fashion and with little effort.

Abstract: A fluid pulsator includes a housing containing a fluid reservoir, an inlet port, an outlet port, and a valve assembly biassed to an open position by a predetermined biassing force, the valve assembly includes a surface exposed to the inlet pressure to close the valve assembly when subjected to an inlet pressure greater than the biassing force. An inlet control passageway into the reservoir is dimensioned to produce a flow rate smaller than that in an outlet control passageway from the reservoir.

Abstract: A pressure relief valve (10) for a pilot operated fluid system (FIG. 4) for a pressure vessel (12). Pressure relief valve (10) has a valve body (14) forming a valve chamber (16) accessible by upper cover plate (24). A cylindrical housing (32) is mounted in the valve chamber (16). A valve stem (38) has a diaphragm assembly (40) on its upper end and a valve assembly (42) on its lower end. Diaphragm assembly (40) includes a rolling loop diaphragm (44) fitting between opposed surfaces (36, 60) of housing (32) and piston member (56). A circular guide (66) on valve stem (38) fits within housing (32) for guiding the movement of the valve stem (38). Valve assembly (42) is connected to valve stem (38) about a ball and socket joint formed by ball (70) on the valve stem (38) and a socket (84) on the valve assembly (42).

Abstract: A variable overpressure relief valve for a buoyancy compensator including an open hole base member for securement to a buoyancy compensator and a pair of spring biased floating disks in the base member sealing the hole and biased apart and held in place by a vented cover secured to the base member and having an adjustment button for changing the spring bias separating the floating disks.

Abstract: An electromechanical actuator-operated pressure regulator for supplying control pressure for a diaphragm-operated gas control valve, the actuator also operating an on-off control valve for the gas valve. A passageway including a pressure adjusting device for supplying a minimum gas valve output pressure extends from the downstream side of the on-off valve to the gas valve outlet.

Abstract: A gaseous fuel pressure regulator includes a moveable diaphragm that subdivides the regulator housing into a pressurized gas chamber and a reference pressure control chamber. A coil spring in the control chamber exerts a control force on the diaphragm in opposition to the gaseous fuel pressure that is to be regulated. The diaphragm is connected to a lever that carries a poppet valve element associated with a gaseous fuel inlet port supplying unregulated pressurized gaseous fuel to the gas chamber. An arcuate baffle structure partially surrounds the inlet port, such that gaseous fuel flow is directed from the inlet port toward the gas chamber central axis, instead of flowing directly from the inlet port to a nearby outlet port.

Abstract: A valve has removable internal components including a disc, an orifice plate, and guides for engaging and guiding the disc. The internal components are removably secured to a valve seat plate by tee bolts. The seat plate is drilled, bored, or machined to include a plurality of cavities. Each cavity has a cantilevered projection extending over avoid in the cavity, and a slot is formed in each projection to form a tee slot for receiving the tee bolt. Each tee bolt has a head which is slipped into the void in the cavity so that the head engages the cantilevered projection while a shank of the tee bolt extends outward through the slot. The orifice plate has bolt holes for receiving the tee bolts, and an opening in the orifice plate is aligned with a passageway through the valve. A nut is tightened onto the shank of each tee bolt. After extended service, the tee bolts are still easily removable and replaceable, and the tee bolts can be aligned with bolt holes in a replacement orifice plate.

Abstract: A valve includes two outlet ports and two inlets communicating with a chamber and includes two valve seats. A membrane is secured in the chamber. Two plugs are slidably engaged in the inlets for engaging with the valve seats and each includes one end engaged with the membrane and the other end slidably engaged with a cap. Two springs are engaged between the plugs and the caps for balancing the membrane and the plugs. One of the plugs is forced to engage with the valve seat by water from the inlet when no water is supplied to the other inlet.

Abstract: A valve for venting a container has a valve housing with an annular chamber. A ring member with a first axial and a second axial end is arranged in the annular chamber. The ring member has a first sealing lip at the first axial end and a second sealing lip at the second axial end. A first channel and a second channel extend axially along the ring member for venting the container. The first channel vents in a first direction and the second channel vents in a second direction opposite the first direction. The first sealing lip closes off the first channel such that the first sealing lip and the first channel function as a relief valve. The second sealing lip closes off the second channel such that the second sealing lip and the second channel function as a relief valve.

Abstract: A mixer control valve comprises a base, a cover covering the base, and a washer, a cylinder and a control shaft disposed between the base and the cover. The mixer control valve couples with a water volume control valve. The water volume control valve has a control rod and a plurality of positioning rods. The cover has a first outlet, a second outlet, a plurality of fasteners, and a plurality of positioning holes to receive the corresponding positioning rods.

Abstract: A manifold valve has a pair of inlet ports and a pair of outlet ports with separate passageways extending separately between a respective inlet port and a respective outlet port of the pair. The manifold valve has a body portion in which a plurality of valves are disposed for controllably directing and selectively blocking the flow between selected inlet and outlet ports. The manifold valve also has a flange portion that is integrally formed with the body portion and has a means disposed therein for selectively providing a separately modulated flow path between each of the internal passageways and an environment external of the manifold valve.

Abstract: A fluid flow device has a body which includes an inlet and an outlet with a valve seat therebetween. A valve stem having a valve member thereon is mounted in the body, and the valve member is operably connected to a diaphragm which separates a region within the body into a pair of separate pressure chambers. A fluid passage is formed in the body communicating one pressure chamber with upstream pressure in the inlet, while the other pressure chamber communicates with downstream pressure in the outlet. A pressure differential between the chambers will normally hold the valve member in an open position against the action of a biasing means, until the pressure differential reaches a predetermined amount, whereby the valve member is slowly closed until fluid flow through the device is stopped.

Abstract: A five valve flanged manifold valve in a straight-flow configuration has a height that is less than 25 percent greater than it width, and in 90.degree. angled flow configuration is less than 50 percent greater than its width. A vent pert is advantageously positioned on the front face of the valve in both configurations. A vent pert control valve is located a rear surface of the straight flow configuration manifold valve, and on a bottom surface of the 90.degree. flow configuration manifold valve. Neither configuration of the manifold valve requires a separate access hole for use during manufacture to form and shape the internal crossflow passageways. Both configurations have significantly less mass than the counterpart prior valves of their respective types.

Abstract: A flow-responsive diverting valve is particularly useful with pressure washers of the type having a water pump coupled to an internal combustion engine equipped with a pull-rope starter. The valve provides an "easy-start" feature and has a valving chamber and a fluid inlet and two fluid outlets. A magnet is fixed on the valve body and when fluid flows into the inlet at the low flow rate occurring when operating the starter, a valving device, e.g., a check ball, is restrained by the magnet. When fluid flows into the inlet at a higher flow rate (as when the engine is running and the pump is delivering water at a substantial rate), the device closes the first outlet and diverts water to the second outlet. A method for operating a pressure washer includes magnetically restraining the valving device away from the first outlet while operating the starter and then running the engine, thereby urging the device to close the first outlet.

Abstract: A check valve or backflow preventer has a valve mechanism mounted to a valve cover for removal and replacement as a unit. The valve clapper is resiliently supported to accommodate variations in tolerance. The valve seat is removably secured within the valve body by compression of a resilient seal ring to engage opposed walls of the seat and body. A spring pretensioning member facilitates safe replacement and removal of the valve mechanism.

Abstract: A uni-directional fluid valve particularly for use as an exhalation valve for a filter mask comprises a flexible flap attached at one end to a concave portion of a seat. The mounting of the flap imparts to it a transverse curvature, stiffening the flap sufficiently for it to remain seated in the absence of a pressure differential across it even when orientated with the seat above the flap.

Abstract: A servovalve includes a casing presenting an inlet and an outlet, and a primary valve supported on the casing and including a valve plug that is movable between a closed position blocking flow through the casing, and a plurality of open positions in which the valve plug presents a restriction of variable size for varying the flow. A diaphragm supports the valve plug and includes a first side proximal to the plug and a second side remote from the plug. A control chamber is provided on the first side of the diaphragm, and is connected to the inlet by a pilot inlet passage and to the outlet by a pilot outlet passage. A pilot valve controls the flow of fluid through the pilot outlet passage, and includes a control plug that is movable between a closed position in which the control plug blocks the pilot outlet passage, and a plurality of open positions in which the control plug presents a restriction of variable size within the pilot outlet passage for varying the flow between the control chamber and the outlet.

Abstract: A plurality of concentric annular plates (1) are braced against a valve guard (2) by means of radially arranged spring-loaded bridges (5). The guided height (6) of the bridges (5) is at least equal to the maximum lifting height (7) of the annular plates (1) which abut against centering elements (8) of the bridges (5) and are guided by means of the bridges (5) relative to the valve guard (2) along the entire lift. A very simple guiding of the annular plates (1), which preferably impact against the valve guard (2) only via the bridges (5) and thus show a reduced tendency to sticking, is achieved particularly by constructing the annular plates (1) and/or bridges (5) from fiber-inforced plastic material.