Abstract: A forged steel male end valve provided with a new and improved body with a centering end ring adapted for butt welding as for instance with respect to a tank or pipe, said body being greatly enlarged in diameter, compared to the bore of the body, adjacent to the centering ring, and tapering gradually downwardly from a maximum to a minimum cross-sectional area intermediate the ends of the body. The valve body as a whole is greatly elongated to provide space for application of insulation. The valve body includes in addition to the enlarged end portion, a portion of generally uniform cross-section, extending from the gradually tapered portion, the uniform portion being preferably of equal or greater length than the downwardly tapered portion. Thereafter the outer diameter of the body may e.g. remain uniform for a short distance and then it slopes gradually downwardly to the portion of uniform diameter.

Abstract: A control system equalizes the torques of a lead and a slave engine driving a common load by comparing the throttle settings of the engines and controlling the slave engine throttle with a speed signal equal to the algebraic sum of the lead engine speed signal and a control adjustment signal equal to the sum of an adjusted, selected gain times the sum of the instantaneous error signal and the integral of the error signal over an adjusted, selected reset time.

Abstract: This invention provides a valve consisting of a body and rotatable valve member, both of which are made of plastic, the valve body having a passageway intersected by a frustoconical opening which receives the valve member. The valve member is rotatable for controlling the flow through the passageway, the rotation being accomplished by engaging a recess in the outer end of the valve member. The body includes an outwardly deflectable shoulder that fits over the outer end of the valve member to hold the valve member in the body. The valve member is made to a greater major diameter than that of the opening in the valve body to provide an interference fit. Deep annular grooves around the valve opening provide a thin wall for the valve body around the opening, allowing distortion-free molding of the valve body.

Abstract: A plastic valve assembly includes a body member and a controller member each having alignable transverse flow passageways and constantly aligned longitudinal flow passageways. The controller member is positioned in the body member for rotatably aligning the transverse passageways. Axially spaced about the exterior of the transverse body passageway are a pair of lands and axially spaced about the transverse controller passageway are a pair of resilient seals. A recess completely surrounds the exterior of the transverse controller passageway with a resilient wiper seal seated in the recess. The controller member is so positioned in the body member that the resilient seals constantly and sealingly engage the lands and the wiper seal constantly and sealingly engages the interior wall of the body member surrounding the transverse controller flow passageway.

Abstract: A disc-type valve assembly and method of making same. The assembly includes a valve body having a flowway with a disc-like valve element therein. A shaft has an inner portion directly rigidly connected to the valve element by a pre-stressed self-connection and an outer portion rotatably mounted in the valve body. A handle is directly rigidly connected to the outer portion of the shaft by a pre-stressed self-connection whereby the handle and shaft form a rotating body. A positioning sleeve is interposed in tight pre-stressed relation between the valve body and the rotating body for preventing relative rotation between the bodies under torque loads below a pre-determined magnitude, the positioning sleeve being yieldable under torque loads greater than or equal to that magnitude to permit such rotation.

Abstract: A mobile sprinkler propelled by water pressure has a bellows coupled with a ratchet drive, water being alternately admitted to the bellows under pressure via one conduit and discharged therefrom via another conduit forming part of a squeeze-duct assembly. The assembly includes a rigid housing against whose sidewalls the two conduits are alternately flattened by a rotating valve body coupled with the ratchet drive, each conduit being of substantially O-shaped cross-section in its uncompressed state and consisting of a relatively thick-walled inner tube of elastomeric material, a relatively thin-walled intermediate tube of flexible synthetic-resin fabric and a relatively thin-walled outer tube also made of elastomeric material.

Abstract: A valve actuator provides preselected automatic spring-powered actuation of a rotary-actuated valve in response to fire, or other occurrence of a specific exigent type. The actuator is secured to a valve having a shaft extending from the valve body and rotatable through a predetermined rotational extent, e.g. 90.degree., for moving a valve element between open and shut portions. The actuator comprises a coiled or spiral torsion spring in an enclosure protectively covering the spring. One end of the spring is secured relative to the cover. A coupling is operatively connected to the other end of the spring and biased by spring force for being drivingly rotated for valve actuation. A camming arrangement holds the coupling against rotation by camming force against the spring force, a releasable link being operatively interconnected with the camming arrangement for maintaining the camming force.

Abstract: Apparatus for combining fluid flows in variable proportions is adapted for blending an active constituent gas and a diluent gas to calibrate gas analyzers used in monitoring pollution.Diluent gas passes from source 34 through a downstream differential pressure regulator 17 and a constant flow restrictor 12 to outlet 14 which communicates with control port 20 of regulator 17. Active gas passes from source 35 through differential pressure regulator 23, through three fixed parallel flow restrictors 22, 29 and 30 to combine with the diluent gas upstream of restrictor 12. Control port 26 of regulator 23 communicates with the input to restrictor 12. Switching of valves 31, 32 and 33 varies the rate of flow along conduit 16 and hence the proportions of gases combined upstream of restrictor 12. Regulator 23 maintains flow along 16 substantially constant for given valve settings, and regulator 17 maintains flow along outlet 14 substantially constant despite changes in flow rate in the conduit 16.

Abstract: In a valve structure, a valve plug apparatus to provide a leak-tight valve shut-off, is disclosed. The valve structure includes a valve body provided with an inlet passage, an outlet passage and an internal web portion intermediate the inlet and outlet passages. A closeable passage-forming means is arranged in the web portion and a two-member valve plug is mounted on a valve stem for controlled axial movement within the web portion and operable to close said closeable fluid passage-forming means to shut the valve. In accordance with the invention, the two-member valve plug comprises a lower plug member and an upper plug member which are in a generally axially spaced relation on the valve stem. Packing means is held in a snug-fitting condition between the lower and upper plug members by an axially resilient member which acts between one end of the valve stem and the valve plug to urge the lower and upper plug members together.

Abstract: An excess pressure valve particularly for props having telescopic parts which are extensible or retractable by fluid under pressure used in underground mining operations, comprises a valve housing having a bore therethrough with a connection end connectable to the fluid under pressure and an opposite opened end. A tubular sleeve is slidable in the bore and has a passage therethrough for the fluid under pressure and it has an annular inlet end face facing the connection end and an opposite annular pressure end face which opposes a piston which is also slidable in the bore between the sleeve and the opened end. The fluid under pressure maintains the sleeve and the piston in slightly spaced relationship so that there is a small space therebetween which is sealed by an annular pressure seal.

Abstract: A concentric rotary valve having a rotatable stem of a valve disc supported by bearing portions and metal seats mounted in a valve housing to contact metal seats on the valve disc. Clearances in directions parallel to a closed disc surface and radial of the valve stem are barely enough to permit a shift of the valve disc to provide a good seat-to-seat contact when the valve is closed, and clearances in directions normal to the closed disc surface and radial of the rotatable stem are barely enough to permit normal rotations of the stem.

Abstract: A vacuum breaker for use on a moving tank for allowing atmospheric air to enter the tank to relieve a reduced pressure condition in the tank. The vacuum breaker has a light-weight closure assembly including a closure member of relatively large area. The closure assembly is normally held closed by permanent magnets. The magnets and the light-weight construction of the closure assembly substantially prevent the vacuum breaker from opening due to vibration of the moving tank. However, the vacuum breaker opens readily in response to a relatively slight reduced pressure in the tank because of the large area of the closure member. The permanent magnets are shielded from undesirable proximity of ferrous objects to prevent the magnets from being drained. The vacuum breaker may be opened manually to test for a positive pressure condition in the tank.

Abstract: A safety relief valve especially suitable for connection in a pressure gas system for beverage dispensing equipment has a body that defines a vented cylindrical valve cage and a coaxial annular valve seat at one end of the cage with an annular seating surface that faces axially into the cage. A pressure chamber in the body is communicable with the valve cage through the valve seat. A valve element, coaxially movable in the valve cage, is biased towards engagement with the seating surface and presents a pressure surface to the pressure chamber. Opposite tubular nipple portions of the body have bores that are symmetrical to the valve cage axis and communicate at their inner ends with the pressure chamber, said inner ends being separated by a baffle which is symmetrical to said axis and projects into the pressure chamber from the side thereof opposite the valve seat.

Abstract: A valve installed in a sewer pipe or drain pipe extending from a house or other building to a street sewer pipe or the like which will automatically close when sewage backs up from the street sewer pipe toward the house or building structure thereby preventing back flow from the sewer pipe into the house thereby protecting the basement or other lower portions of the house or building structure from becoming flooded due to sewer backup. The valve is motor actuated and includes a vertically reciprocal gate controlled by a float operated switch structure disposed downstream of the valve to quickly and positively move the valve to fully closed position upon flood conditions existing in the lateral sewer pipe downstream of the valve thereby preventing back flow and flood conditions occurring on the house side or upstream of the valve.

Abstract: An elongate flexible cable is used as a fastener for preventing sliding movement between adjacent surfaces of two valve components. The cable is inserted through a closable port in the valve, and extends through a uniform channel formed by aligned grooves in the two components. In a preferred aspect, the cable fastener is used in conjunction with a spring to retain axial cylindrical seats in operating position in a ball valve.

Abstract: A clamp for providing a stable fluid flow rate through a flexible tubing has a channel having a bottom wall including an anvil for supporting the tubing and an opening along its entire length for readily receiving and supporting the tubing against the bottom wall and the anvil. The channel also includes a pair of slots adapted for receiving and retaining a tube-constricting means. The constricting means comprises a rotatable cam having a groove of varying depth along its surface which coacts with the anvil to define a reduced-flow passageway in the tubing. As the cam is rotated from an opened position, corresponding to a maximum fluid flow rate through the tubing, to a closed position, the groove presents to the tubing a plurality of similar triangles progressively reduced in size to reduce the flow passageway in the tubing.

Abstract: In a butterfly valve, comprising a valve disk which is pivotally mounted in a valve housing for movement between a closed position, in which it prevents the flow of fluid along a passageway defined by the housing, and an open position in which the flow of fluid is allowed, an annular seal is provided to seal between the periphery of the disk and the wall of the passageway when the disk is in its closed position. The seal comprises two deformable sealing members of P.C.T.F.E. with a rigid fireproof ring independently mounted between the sealing elements. The disk is located for pivotal movement by locating means constituted by fire-destructible members of a similar material to that of the sealing elements, so that in the event of a fire that destroys the sealing elements the disk becomes free to move a small distance along the passageway into engagement with the fireproof ring to effect a seal.

Abstract: A fluid control valve has a cylindrical body member with inlet and outlet passages in spaced relation to one another. A control stem is movably positioned in a control chamber formed by the body member. A split expandable sleeve in the control chamber is movable by the control stem to provide overall volume control.

Abstract: A self-restricting shutoff valve for use with a fluid leak detector to prnt excessive loss of fluid in event of a high flow-rate leak. A valve spool within a valve body is spring-biased to a partial flow position and is maintained in an opened position by fluid pressure. Upon loss of fluid system pressure, springs move the valve spool to a position to restrict fluid flow through the valve body. When sufficient loss of fluid occurs, a fluid leak detector actuates a pilot valve so that system fluid moves the valve spool to a closed position.

Abstract: A two piece roller clamp is disclosed for regulating the fluid flow rate through plastic tubing by defining the size of the tubing lumen. The clamp includes a U-shaped body with a base and two side walls and a longitudinally movable roller mounted in tracks formed in the side walls. The roller is biased against a roller bearing surface running along the length of the base. Adjacent to the roller bearing surface is a tube compression slot having a lower wall uniformly spaced below the roller. A channel of varying cross-section is provided in the lower wall of the tube compression slot. The roller exerts a uniform, but minimal force on the tubing compressing it against the lower wall of the slot permitting the formation of a lumen defined by the contours of the channel.