Abstract: Various embodiments of pinch valves include an annular rib 5 formed on the inner walls of an elastic tube 4. The annular rib 5 is obliquely oriented in the elastic tube 4 and permits passage of fluid therethrough when the tube 4 is not deformed. Upon selective deformation of the tube 4 by choking means 6,7, the annular rib 5 prevents passage of fluid through the tube 4.

Abstract: The invention is directed to a detent and a method for maintaining a valve body of a valve in a predetermined position. The valve has an outer housing and a valve body is slideably positioned in the outer housing. A raised diameter section is located on the outer periphery of the valve body. A resilient detent member is positioned around the outer periphery of the valve body. The detent member has a diameter less than the diameter of the raised diameter section. The detent member is positioned to engage the raised diameter section when the valve body is in the preselected position. The engagement of the raised diameter section by the detent member maintains the valve body in the preselected position.

Abstract: A blowout preventer comprises a housing with a pair of opposed rams carrying sealing blocks for sealing against tubing extending through the housing. Openings in the front side of the housing provide access to the sealing blocks for changing the blocks and a door closes the openings during normal in-service use of the preventer. A door guide permits the door to be slid in either of two opposing edgewise directions for exposing the openings one at a time but keeps the door from being movable substantially in a broadwise direction. Sealing inserts disposed within the openings between the door and the sealing blocks serve to seal against leakage and a rack and pinion mechanism provides the means for sliding the door from a centered position closing both openings to opposite edgewise positions exposing one or the other of the openings.

Abstract: A pressure regulator and safety valve assembly comprises pressure regulating means and safety valve means. The pressure regulating means is so coupled to the safety valve means that the pressure at which the safety valve means opens varies independence upon the setting of the pressure regulating means. The safety valve means includes a safety valve member mounted for movement relative to a static surface between a closed position in which the safety valve member seals against the static surface and an open position in which the safety valve member is spaced from the static surface.

Abstract: A chemical injection system for automatically injecting chemicals into a fluid process line in direct proportion to the fluid flow. A fluid flow meter in the line operates a cam which in turn operates an air valve for pneumatically actuating a controller by air pulses. The controller in turn supplies pressurized air to an injector pump to operate the pump in cycles corresponding to the air pulses. By manipulating valves the controller can be changed from operating in response to the fluid-flow related air pulses regulated by the meter to a self-contained adjustable speed of operation and such valves may be remotely controlled.

Abstract: A liquid metering injector assembly for injecting metered quantities of a first liquid into respective metered quantities of a second liquid comprising a metering cylinder, metering ports formed at either end of the metering cylinder; a metering piston displaceable in the metering cylinder; a valve unit having a valve inlet for coupling to a pressurized source of the first liquid; means for coupling the valve to a hydraulic pulse source; a valve outlet for coupling to a source of the second liquid; a pair of communication valve ports of said valve unit respectively communicating with the metering ports and selectively communicatable with the valve inlet and outlet and a displaceable spool valve of the valve unit responsive to the hydraulic pulses so as to be displaceable between two positions in which the respective communication of the valve unit communicating ports with the valve unit inlet and outlet are successively reversed.

Abstract: In a squeezed tube valve which comprises a valve block with a longitudinal groove to guide a flexible tube and a transverse groove for an electromagnetically actuated clamping bolt to shut off the tube, the crossing between the longitudinal and the transverse groove is rounded off at its edges, and the clamping force exerted by the bolt rises from zero according to an asymptotic rise function over the duration of the shutting action.

Abstract: This invention provides a valve by means of which a major portion of the suction flow of a swimming pool filtration system is channeled through an automatic cleaning device which cleans the floor and/or wall of a swimming pool, and a minor portion of the suction flow is drawn from the surface of the pool thereby to skim the surface. The valve has a main inlet opening connectable to the device, an outlet opening connectable to the filtration system and an auxiliary opening which is closed to some extent by a closure member to normally provide a restricted aperture through which the water drawn from the surface flows. The closure member is biassed closed by a spring located in a variable volume chamber which communicates with the interior of the valve between the auxiliary opening and the main inlet opening. When the restricted aperture is blocked by leaves or the like, the pressure in the chamber decreases, compressing the spring and allowing the closure member to open.

Abstract: A guide for a poppet in a check valve includes an annular, cylindrical rim and a guide hub concentric therewith. At least one web extends radially from the guide hub to the rim. The outer periphery of the rim includes at least one projection defined at a position angularly spaced from the web. The projection is engaged by the inner periphery of the check valve such that the guide is held within the check valve, with a stem on the poppet extending through the guide hub. The guide hub includes at least one lug to engage the stem to prevent rotation of the stem relative to the check valve. The guide is formed of a smooth bearing material, and the rim thereof is capable of flexing, in the area where the projections are provided.

Abstract: A system for selectively dispensing and/or mixing or otherwise utilizing materials contained in respective storage tanks, including a material conveyance means, such as a pump, and a specialized selector valve programmably controllable to supply the materials to one or more processing containers in desired quantities and in a desired sequence.

Abstract: The steam throttle valve has water injection ducts disposed about the valve axis. The ducts are situated between two abutting flanges of a valve cage and a valve spindle guide. The ducts are in the form of grooves in the flange while the adjacent peripheral surface of the flange is plain. The valve cage forms a replaceable wearing component and the configuration of the water injection ducts avoids thermal stress cracks in the duct zone.

Abstract: A three-way or three-ported flow-regulating valve for use in a hydraulic system comprises a two-position two-ported throttle valve inserted between an inflow conduit and an outflow conduit and a pressure-relief valve connected to the inflow conduit at an upstream point thereof and at a downstream point proximate to an intake port of the throttle valve. A servovalve is connected in parallel to the throttle valve via small-diameter pressure-transmission channels extending to the intake port and to an output port of the throttle valve. Upon a jump in the pressurization of the inflow conduit, for example due to the activation of an auxiliary pump, the pressure-relief valve opens; it closes again only upon an equalization of the pressure throughout the inflow conduit. The servovalve has a biasing spring which exerts a force determining the maximum pressure drop across the throttle valve.

Abstract: A valve assembly for use in a system carrying radioactive slurry. The valve assembly consists of a valve body with a bore, an inlet and an outlet port communicating with the bore; a valve member having a passage extending therethrough. The valve member is received in the bore of the valve body and is rotatable between a first position in which the passage of the valve member is aligned with the inlet and outlet ports of the valve body providing fluid communication between the inlet and outlet ports of the valve body and a second position in which the valve member shuts off or blocks the above fluid communication. The valve body and valve member are removable as a unit from the valve housing via a tubular extension which extends from the bore in the valve body to a location above and remote from the valve housing.

Abstract: A buoyancy prime mover that converts the potential energy of a gas buoyant within a liquid into rotating mechanical energy comprises a plurality of rigid or collapsible buckets joined by one or more chains with rotatable sprockets and shafts to form a continuous loop so that when the buoyant gas is trapped within the buckets, the buckets rise through the liquid and rotate the chain and sprockets to generate power.

Abstract: A system for controlling the viscosity of flexographic and gravure printing ink. The system includes a variable weight hydrometer which monitors the density of circulating printing ink. The hydrometer is in cooperative relationship with a supply of solvent. When the density goes above a predetermined level solvent is fed to the ink until the predetermined level is reached.

Abstract: A hydraulic fluid discharged from a pump is delivered to a power steering device from a supply passage through a restricted passage and a throttled passage so that as the flow through the supply passage increases in response to an increase in the number of revolutions of the pump, the flow path resistance presented by the restricted passage increases the pressure prevailing in the supply passage to cause a control spool to control the flow area of the throttled passage, thus decreasing the flow delivered to the power steering device. In this manner, a constant and invariable flow decrease characteristic can be maintained despite a loading pressure upon the power steering device, thus enhancing the stability under high speed running conditions. A mechanism to provide a variable control of the flow delivered to the power steering device is provided in a union which is fixedly mounted in one end of a bore in a pump housing.

Abstract: An improvement in blowout preventer apparatus of the type having a radially compressible annular packing mounted within a housing chamber, the housing having axially aligned upper and lower conical bores communicating with an inner bore of the annular packing, the packing axially expanding towards said upper and lower bores upon said radial compression, a plurality of rigid end ring segments attached to sectored webs of the ends of the packing and thereby individually movable axially outwardly and radially inwardly relative to the upper and lower conical bores to control the packing axial expansion during radial compression of the packing has keying means cooperating with the rigid end ring segments of the packing and the conical bores for guiding a sector-wise movement of the segments in individually separate and predetermined paths along the conical bores to a common radial position independent of the uniformity of the packing radial compression and/or axial expansion.

Abstract: A back flow valve comprising a housing having an inlet and an outlet and a tube mounted in the housing and having an open end communicating with the inlet in said housing. The tube has the other end thereof closed and has a plurality of circumferentially and longitudinally spaced openings at the center thereof such that liquid can only flow from the inlet to the housing through the openings in the tube to the outlet of said housing. An elastic sleeve is telescoped over the tube and normally closes the openings, the inside diameter of the sleeve being less than the outer diameter of the tube. The tube has longitudinally spaced abutments adjacent the ends of the sleeve and the length of the sleeve is less than the longitudinal distance between the abutments.

Abstract: A butterfly valve includes a gasket on the pivotable member which has a peripheral ring portion and two end rings which are concentric to the shaft supporting the pivotable member, each end ring having a flange held under spring pressure between the pivotable member and bushings on the shaft ends. The gasket thus seals the valve against leakage to the outside and to the shaft.

Abstract: A hydrocentrifugal machine is disclosed in which the rotor is a vortex-expeller rotor defining two generally spiral-shaped vortex-expeller passages and a hydraulic induction coil comprising a helical, inwardly-opening channel is affixed to the inner face of the outer, cylindrical wall of the centrifugation chamber.