Abstract: A flow control valve in which the hydraulic pressure difference exerted on a spool valve is controlled by regulating the degree of throttling of a variable orifice and the oil which is discharged from an oil pump is partly returned to the suction side of the oil pump in response to the degree of actuation of the spool valve according to the above hydraulic pressure difference, thereby controlling the quantity of oil that is fed to hydraulic devices. The flow passage to communicate the oil pump with the hydraulic devices includes a flow passage which permits the hydraulic oil to pass through a hole in which the spool valve is fitted, and a variable orifice is composed of an opening of the flow passage into the hole and a small diameter portion formed on the spool valve. The throttling of the variable orifice is attained by covering the opening with a predetermined clearance by the above small diameter portion.

Abstract: A combination by-pass and check valve for use in a fluid flow system comprising a valve body having an inlet and outlet and a passage therethrough. A seat disposed in the valve body between the inlet and outlet for location of a check disc thereon, the disc and seat cooperating to prevent fluid flow from the outlet to the inlet. A sleeve having one or more orifices therein extends from the check disc and substantially surrounds a portion of a perforate tubular by-pass located intermediate the seating surface and the inlet. The orifices in the sleeve and the perforations in the by-pass are in at least partial alignment and communication when the disc is on the seat, permitting fluid flow through the by-pass. When fluid flow from the inlet to the outlet has raised the disc a substantial distance off the seat, the orifices in the sleeve are non-aligned with the perforations on the by-pass, preventing fluid flow through the by-pass.

Abstract: The standby supply for delivering pressure fluid to a user component includes a fluid pump as a primary fluid source coupled to the user component by a first check valve, an accumulator as a secondary fluid source coupled to the pump by a second check valve for charging the accumulator and a valve arrangement coupled to the pump, the accumulator and the user component responsive to pressure from the pump to control a connection from the accumulator to the user component.

Abstract: A dual-function deflation valve for hand-held blood pressure measuring devices with a finger-depressible valve actuating lever which has a detent mechanism capable of retaining the lever in the fully open valve position, for a quick release of residual air pressure from the measuring cuff. The detent mechanism has two detent members with cooperating cam formations defined by the valve housing and valve actuating lever, respectively, either on coextending wall portions of both, or on a wall portion of the actuating lever and on a spring member which is mounted in a recess of the housing.

Abstract: A bypass valve with a tubular housing having an inlet at one end, a main outlet at the other end and a bypass outlet between the ends. A larger-diameter valving element controls the flow of fluid from the inlet to the main outlet, and a smaller-diameter valving element which is coaxial with the larger-diameter valving element controls the flow of fluid from the interior of the housing to the bypass outlet. The valving elements are mounted on a rod which confines them to movement in and counter to the direction of fluid flow from the inlet to the main outlet. Each valving element is movable by the fluid to an infinite number of positions in each of which they permit the fluid to flow to the respective outlets at a different rate. The smaller-diameter valving element is movable against an annular seat to seal the bypass outlet from the interior of the housing.

Abstract: A butterfly valve disk plate having a plurality of fluid directing ribs extending from the disc perpendicular to the plane of the disk, the ribs on one side of the disk being located opposite the spaces between the ribs on the other side of the disk and the ribs on one half of one side of the disk being staggered with respect to the ribs on the other half of the same side of the disk.

Abstract: An illustrative embodiment of the invention provides a valve seat that has hot, cold and discharge water apertures. A plate, relatively rotatable with respect to the valve seat, is pressed against the valve seat surface. A cavity formed in the plate adjacent to the surface in contact has a pair of axisymmetric lobes which are asymmetric with respect to an axis that is perpendicular to the axis of symmetry. This configuration permits cold water flow first through the valve with counterclockwise motion of the plate in spite of the relative sources of hot- and cold-water through simple inversion of the plate, as appropriate. Hot- and cold-water pressure loss and surge protection, moreover, is provided through a pressure balancing valve.

Abstract: A shower-tub diverter valve has a housing with a diverter chamber and a water inlet and shower and tub outlets in communication with the chamber. A diverter formed of a stem and a loosely attached cylindrical member are reciprocal in the chamber between a position providing communication between the inlet and the tub outlet, and a second position in which the diverter cylindrical member blocks said communication. The diverter cylindrical member is in substantial sealing relation with the tub outlet when in the blocking position. The cylindrical portion of the diverter is movable relative to the stem and the diverter chamber includes guide means for use in aligning the diverter cylindrical portion as it moves between the described positions.

Abstract: Improved actuator for a control valve especially useful for a compressed air-operated dentist's drill comprises a foot actuated roller connected to provide axial movement through a screw threaded connection to a spring-biased valve control element.

Abstract: A pressure compensating mixing valve incorporating a flow control spool has an equalizing passage interconnecting opposite end zones of the spool, to reduce or obviate the need for connecting the respective end portions of the spool to pressure fluid supplies, such as the respective valve outputs. This reduces the significance of spool seals, owing to equalization of pressure between certain pressurized zones, so that seal leakage is of lessened adverse significance. Also valve malfunction due to silting-up or liming-up is made less probable.

Abstract: An annular valve seat having a resilient metal seal for use in a variety of types of valves provides positive control of fluid flow, with effective metal-to-metal sealing, long life and easy replacement of the seal. The metal seal is in the form of an annular ring comprising approximately one-quarter of a torus that cooperates with the valve's flow control element to establish a metal-to-metal fluid seal which is especially useful at relatively high temperatures. A first edge portion of the torus is held in position against a radial surface of the valve's body by a retainer ring which centers the torus about the flow control element. When the valve is closed the flow control element presses against the outside portion of the resilient metal torus forcing the free edge of the torus against a portion of the retainer ring so that the seal is loaded as a structural span supported at the ends by the valve's body and the retainer ring.

Abstract: Flow control apparatus is disclosed in which a closure element is reciprocated between flow controlling positions by means of a stem which is substantially counterbalanced with respect to forces on the stem due to the pressure of the fluid being controlled as well as ambient pressure conditions.

Abstract: The stackable modular element for a flow divider unit for a hydraulic circuit has a flow regulator with a piston controlling an opening as a function of the variations in the pressure upstream between the fluid input and output. The internal cylinder of the regulator piston (11, 111, 211) opens, on the one hand, onto a stacking face of the element and, on the other, into the exit hole (5, 105, 205) of the element, passing through its entry hole (3, 103, 203) and communicates, via the said stacking face, with a passage (12, 112, 212) for equalization of output pressures traversing the element between its stacking faces and connecting them with the corresponding passages in the adjoining units, the equalization passage communicating, in addition, with the exit hole (5, 105, 205) of the element.

Abstract: For maintaining a predetermined pressure at a controlled pneumatic device, a unit of this invention has a body with an inlet port connectable with a pressure gas source, an outlet port connectable with said device, a pressure chamber at all times communicated with the outlet port, and an annular valve seat through which gas can flow from the inlet port to the pressure chamber. The position of a valve element that throttles gas flow through the valve seat is controlled by a diaphragm having one surface exposed in the pressure chamber and a helical compression spring having an inner end bearing against the opposite diaphragm surface. A cam rotatably supported on the body controls the position of the other end of the spring, for quick stepless adjustment of spring preload and thus of outlet port pressure. An eccentric bushing enables calibrating adjustment of the position of the cam axis for either a maximum or a minimum outlet port pressure.

Abstract: A valve assembly for use in building water systems where hot and cold water supply line pressures vary, and having separate valve means for regulating the hot and cold water pressures. Independently mounted pressure equalizing means operated by the supply water pressures are connected to operate each of the valve means responsive to any pressure differential caused by changes in the supply pressures, to change the water pressure regulated by each of the valve means, with the magnitude and sense of the change reducing any such differential to zero and equalizing the pressures. The separate valve means are actuated by diaphragm assemblies forming a pair of movable walls mounted in a cartridge each one separating one water chamber from an associated hydraulic fluid chamber. Each diaphragm movable wall assembly includes a nonperforated diaphragm clamped between elements and held at its periphery in the cartridge to form a movable wall.

Abstract: In accordance with the present invention an air inlet and outlet valve is disclosed which automatically opens and closes when a bottom operable tank lading valve is opened and closed. The air valve is mounted adjacent the top of the tank and is in fluid communication by means of a conduit with an opening in the tank. The air valve is automatically opened and closed when the lading valve opens and closes by means of an air valve linkage including an operating shaft which extends from the lading valve up through the tank to operate the air valve. The air valve is located in a chamber in the upper portion of the tank and seats on a valve seat located in the lower portion of the chamber.

Abstract: A fuel flow distribution system having a hydraulically actuated flow sensing valve, a hydraulically operated switch assembly and at least one hydraulically operated on-off valve assembly. These elements are operably connected to a metered flow manifold and a plurality of distributor lines. The flow sensing valve supplies fuel to the manifold. Various flow rates of the fuel within the distributor lines causes the flow sensing valve to emit a signal. Upon receipt of this signal the switch assembly transmits the signal to the valves making up each valve assembly. The on-off valve assembly (assemblies) alters the flow restriction at the distributor lines in such a manner as to limit the change of pressure therein.

Abstract: In accordance with the present invention an air inlet and outlet valve is disclosed which automatically opens and closes when a bottom operable tank lading valve is opened and closed. The air valve is mounted adjacent the top of the tank and is in fluid communication by means of a conduit with an opening in the tank. The air valve is automatically opened and closed when the lading valve opens and closes by means of an air valve linkage including an operating shaft which extends from the lading valve up through the tank to operate the air valve.

Abstract: A combined unloader and check valve for use with a motor driven air compressor (70) in which pressure trapped in the compressor head when the compressor is shut down is unloaded by means of an unloaded valve element (44) which opens a port (26) to unload the head pressure to atmosphere through an exhaust port (62) in response to the closing of a check valve element (34) in the compressor outlet line. When the compressor is operating and the check valve is open, pressure above the unloading valve element keeps the unloading valve element in position to shut off flow through the exhaust port. Air trapped above the unloader valve element when the check valve is initially closed is bled off through a filter element (52). In a preferred embodiment of the invention, the unloader valve element (144) is in the form of a diaphragm. The filter element (52) can be a compressible material to permit adjustment of the bleed rate therethrough by varying the density thereof by means of an adjustable bleed screw (48).

Abstract: In accordance with the present invention an air inlet and outlet valve is disclosed which automatically opens and closes when a bottom operable tank lading valve is opened and closed. The air valve is mounted adjacent the top of the tank and is in fluid communication by means of a conduit with an opening in the tank. The air valve is automatically opened and closed when the lading valve opens and closes by means of an air valve linkage including an operating shaft which extends from the lading valve up through the tank to operate the air valve.