Abstract: The present invention is a faucet which can be opened to a user settable degree, thus allowing a user to set the water temperature. The faucet knob has an internal cavity which houses a left-hand threaded sleeve. As the faucet knob is turned counter-clockwise, a threaded stop collar, which matingly engages the threaded sleeve, is drawn up within the faucet knob cavity until the collar encounters a setscrew. The setscrew prevents further movement of the stop collar along the threaded sleeve, thus preventing further turning of the knob. The surface, of the stop collar, which contacts the setscrew can be provided with resilient ramps which allow further adjustment of the knob position by an adult user, and raised flats or steps which completely prevent any further turning of the knob once the stop collar reaches the setscrew. More than one setscrew can be provided to accommodate the water temperature preferences of different users.

Abstract: A closed-system, combination infusion and flush set which enables safe administration of both medicaments and flush solutions to a patient with great accuracy using conventional large volume parenteral bags. The administration set comprises a specially designed rotatable valve member for controlling fluid flow through the set and includes a stop post which positively blocks rotation of the valve member to a position that permits the flow of flush solution toward the patient.

Abstract: A manually operable pressure relief valve for swimming pool filter systems and the like, including a valve housing, a valve stem movable axially in the housing to open and close the valve, and a top cover that serves as an operating handle. The valve housing and the valve stem have components that cooperate to provide an axial movement from closed to fully open with only a quarter turn of the stem, and to prevent inadvertent removal of the stem from the housing. The stem must be moved deliberately through a sequence of required rotational and axial displacements to remove it. The top cover must also be manipulated in a prescribed manner to effect removal of the stem from the housing.

Abstract: A valve assembly is disclosed which comprises a screw spindle threadingly mounted to a valve housing and having a tap handle secured to a first end and a valve disc located at a second end, and wherein rotation of the spindle causes the valve assembly to move between an open and a closed position. The valve assembly further incorporates an indicator arranged to indicate a predetermined degree of rotation of the spindle from the closed position.

Abstract: A flow-control valve has a valve housing and a valve element in the housing rotatable about an axis through at most 360.degree. between a fully open position for substantially unimpeded fluid flow through the housing and a fully closed position for substantially no fluid flow through the housing and through intermediate positions for intermediate levels of flow through the housing. A spindle coupled to the element extends along and is jointly pivotal with the element about the axis. A handle fixed on the spindle is provided offset from the axis with a handle stop so that the handle stop orbits about the axis as the handle and spindle are rotated to adjust the valve.

Abstract: A multiple flow rate fluid control valve assembly in which the mode of fluid flow is interfaced with the rate of fluid flow has a mode control valve having a switch for selectively setting the valve to either of a continuous fluid flow mode or a pulse fluid flow mode. A fluid flow rate control valve is connected to the mode control valve for selectively controlling the rate of fluid flow from a source of fluid through the rate control valve to the mode control valve, to thereby provide fluid from the source of fluid to the mode control valve at a rate which is appropriate for the mode of fluid delivery and the particular fluid use.

Abstract: A valve handle latching assembly having a selectable latching slider which engages a detent on a fluid control device such as a ball valve. During assembly, a particular slider is selected for inclusion in the final assembly resulting in a valve tailored for its intended purpose. Depending upon which latching slider is selected, the valve handle latching assembly latches in the open and/or closed position(s) thereby preventing inadvertent rotation. The latching handle assembly may be manually disengaged to permit rotation of the handle in the opposite rotational direction.

Abstract: The valve upper part has a head piece (1), a spindle (2) and a valve piston (3). The valve piston (3) can move axially in the head piece (1). The spindle (2) can rotate in the head piece (1). Spindle (2) and valve piston (3) are connected together via a movement thread (24, 32). The movement of the valve piston (3) in the axial direction is limited by a stop arranged internally on the head piece (1) and arranged externally on the spindle (2) in the same cross-sectional plane. For axial location, the valve piston (3) and the head piece (1) each have a polyhedron (31; 14) which is formed by teeth which are triangular in cross-section and which interlink. When the valve piston (3) is closed the sealing is hydrostatic by means of a sealing ring (42) retained in the head piece (1).

Abstract: A removable cartridge type valve which affords right and left hand conversion in the same valve. A stop member which affords the conversion is preferably positioned outwardly of the valve housing so that the conversion can be made without turning off the water supply. The stop member requires only a rotation of 90.degree. on the valve stem and also serves to retain the valve stem in a valve housing.

Abstract: A frost-resistant hydrant includes a conduit or body tube connected with a fluid source, a valve, an actuator stem connected with the valve, and a flow-through stem defined by a fluid passage through the valve and the actuator stem. The valve preferably includes a ceramic disk stack rotatable between an open position and a closed position. A combination back-flow preventer and vacuum breaker is positioned in the flow-through stem. The actuator stem has a rotation limit enabling the valve to move between fully open and closed positions within 90 degrees. A cartridge body incorporating the valve includes an anti-rotation key engaging the conduit and fixing the rotational position of the valve cartridge relative to the conduit.

Abstract: A device for controlling the rotation of a valve and/or valve actuator, such device including a housing secured to said valve and actuator, hub member rotatably received by said housing, at least one stop member receiving device provided said housing, and at least one stop member engageable surface provided said hub.

Abstract: A closure valve assembly for the discharge outlet line of a garbage disposal has a resilient deformable housing which defines a fluid passage and a rigid valve element pivotal in said housing and having an outer circumferential surface with a greater diameter than that of the inside surface of said housing.

Abstract: A toilet seat box device to be mounted on the rear part of the top of a toilet contains a nozzle for spraying washing water onto the buttocks of the person using the toilet and a water flow adjustment valve for adjusting the flow of water supplied to the nozzle. The toilet box device has a projecting part on one side which projects toward the front of the toilet. A washing strength dial for operating the water flow adjustment valve is located on the side of the projecting part, and an axle rotated by the dial is mechanically connected to the water flow adjustment valve by gears.

Abstract: A hot/cold water mixing faucet includes a conical bonnet fastened to the faucet body thereof at the top and fixed in position by a flush bolt, which has a longitudinal stop edge on the outside to limit the turning angle of the handle of the faucet, and a spring-supported stop member mounted on the handle and having a front stop bar stopped against the a low-level surface on the conical bonnet at one side of the longitudinal stop edge, whereby the conical bonnet can be set at the desired position closer to the hot water inlet or the cold water inlet, by means of controlling the flush bolt, so as to limit the maximum output water temperature within the desired range.

Abstract: A device for controlling the rotation of a valve and/or valve actuator, such device including a housing secured to said valve and actuator, hub member rotatably received by said housing, at least one stop member receiving device provided said housing, and at least one stop member engageable surface provided said hub.

Abstract: A device for controlling the rotation of a valve and/or valve actuator, such device including a housing secured to said valve and actuator, hub member rotatably received by said housing, at least one stop member receiving device provided said housing, and at least one stop member engageable surface provided said hub.

Abstract: A stop assembly for a valve is disclosed. Two stop rings are interfitted by meshing teeth and driven by a valve stem. In one embodiment, an escutcheon provides a mounting for one of the ring members as well as a stop surface for contact with both rings. The stop assembly provides a stop for maximum rotation of a valve member, as well as an adjustable temperature stop function.

Abstract: Liquid flow through a conduit in a branch of a hydronic system provided with a balancing valve and, in series therewith, a metering valve to obtain a desired rate of flow in the branch is regulated by positioning immediately adjacent the metering valve in the conduit a pitot having an upstream side directed upstream against a direction of flow through the conduit and a downstream side directed downstream in the flow direction. The metering valve is settable in a plurality of predetermined positions each corresponding to a respective flow cross section through the conduit. A differential pressure meter is connected to both sides of the pitot, the one of the predetermined valve positions is selected that gives a near full-range reading on the meter, and the metering valve is set in this selected one position.

Abstract: A metal diaphragm valve is disclosed, which has an improved locking mechanism capable of locking the valve in closed position. The mechanism comprises a roller that is snugly disposed in a cutout formed in the bonnet made integral with the knob which drives the diaphragm through a reciprocating plunger. The roller is made rotatable on a horizontal plane with the bonnet which is in turn turned by the knob. When the knob is turned, for an angle of 90 degrees, from the fully-opened position of the valve to the fully-closed position, the roller slips into a groove formed in a stationary member provided in the bonnet. When the roller fits into the groove, the operator can tactically feel the drop and hear a clicking sound, confirming that the valve is closed.

Abstract: The oil draining control valve comprises a valve housing having a fluid passage and a shaft housing; a valve body pivotally housed in the fluid passage of the valve housing; a rotary shaft also rotatably housed in the shaft housing and engaged with the valve body to pivot the valve body from a closed position to an open position or vice versa; a control lever extending outside through a lever guide slot formed in the valve housing and engaged with the rotary shaft to pivot the valve body; and an elastic member for covering the lever guide slot formed in the valve housing at least when the control lever is pivoted at the closed position. The lever guide slot covering member is a C-shape cross-sectional annular ring, a bellow member, or a blade member, which can prevent the lever guide slot from being clogged with muddy water or grass for providing a smooth valve control operation.

Abstract: A foot-operated control for adjusting a water faucet valve mechanism is disclosed herein having a turning mechanism coupled to a faucet valve in a water line responsive to a foot pedal or treadle for selectively opening and closing the valve to control the flow of water therethrough. Examples of a turning mechanism may be a looped cord about a drum or a lever arm attached to the valve, either of which is operated by a push rod or cable actuated by the foot pedal or treadle.

Abstract: An automatic selector device for multi-gear change-speed gearbox includes a multi-way valve which can be driven into several valve positions each associated with one gear by a stepper motor whose operation depends on an electronic control unit. Each of the valve positions causes the appropriate gear to be selected. The multi-way valve is connected kinematically to a selector unit which can be actuated manually in order to block gears through the intermediary of a stop and an opposing stop.

Abstract: A trouble-shooting, one-quarter-turn quick shut-off valve is mountable directly to a compression-type fitting outlet of a defective shut-off valve in series with the defective valve so that the quick shut-off valve becomes located immediately downstream from the defective valve. Projecting from an inlet end of a housing of the quick shut-off valve is an inlet-tail-tube having an inlet passage extending axially through the inlet-tail-tube. This inlet-tail-tube is adapted for insertion directly into a socket in a compression-type fitting outlet of a shut-off valve. The inlet-tail-tube is made of suitable material for making a compression connection thereto, and the outside diameter of this inlet-tail-tube is equal to an outside diameter often used for flexible plumbing tubing of the type adapted for insertion into a socket of a compression-type fitting for enabling a compression connection to be made between the inlet-tail-tube and the compression-type socket into which the inlet-tail-tube has been inserted.

Abstract: A valve extension actuator subassembly for rotating an extending valve stem of an HVAC valve, having a rotational, polymeric, cylindrical, hollow projection body extending on a central axis coaxial with the valve stem, having an inner end and an outer end, and defining a central space therein, a transverse polymeric handle on the outer end of the projection body, a metal valve plate at said inner end of the projection body, rotatable therewith, and receiving the extended valve stem to rotate it, a removable thermal insulative plug in the central space for thermally insulating the subassembly, and a removable cap closing the outer end of the body. Connection of the body to the valve plate preferably includes snap-on detents. The body preferably has drive lugs interfitting with the valve plate. One embodiment has an adjustable memory stop plate serving as the valve plate, the stop mechanism being accessible with a tool extended through the central space of the body after removing the insert and cap.

Abstract: A three-way valve assembly connected between the purified water delivery tube and the pressure tank of a reverse osmosis water purifier, which includes a casing having a three-way valve controlled by a rotary lever to open or close the passage way through the casing, and a meter fastened to the casing to measure the quantity of water in the pressure tank.

Abstract: A locking mechanism for an actuator prevents the unauthorized operation of the actuator and also permits a viewer to determine whether the actuator is in a locked open, locked closed or unlocked position. The invention utilizes a clear cover guard which is positioned and locked on an actuator body which is attached to a housing. The actuator body comprises threaded bores which permit a bolt to be inserted into the actuator body until it contacts an integral locking cam and driver arm rotatably disposed within the actuator body. The bolt contacts the locking cam in order to selectively lock the integral locking cam and driver arm in a desired position.

Abstract: A ball valve comprising a body including a valve chamber having inlet and outlet ports, and a rotatable ball element disposed within the valve chamber, the ball element having a conduit therethrough which communicates with the inlet and outlet ports. The ball element is movable by a control lever between an open position and a closed position. The valve is provided with a lockable security device which automatically locks the ball element in a positive closed position when the control lever moves the ball element from an open position to a closed position. The lockable security device includes a rotatable cylinder, a locking cylinder slidably mounted on the rotatable cylinder, a supplemental locking member to selectively allow manual locking of the locking cylinder in a position to prevent sliding movement of the locking cylinder on the rotatable cylinder.

Abstract: A plug valve having a body with an inlet, an outlet and a plug-receiving opening which intersects the inlet and outlet. A plug is mounted in the opening and has an outer wall and an orifice extending therethrough. The plug is movable from an operative position in which the orifice connects the inlet to the outlet to allow fluid to flow to an inoperative position in which the orifice is disconnected from the inlet and outlet to prevent the flow of fluid from the inlet to the outlet. The plug outer wall has a seal-receiving portion which is spaced from the orifice and which is adapted to removably receive a seal retainer assembly. A seal is interposed between the seal-receiving portion of the plug and at least a portion of the seal retainer assembly to form a seal.

Abstract: A rotatable control device including a body housing a control structure and having an external box; a control shaft journalled in the boss for rotation about an axis and having an internal portion connected to the control structure and an external portion extending outwardly from the boss; an operating handle having an inner end portion connected to the external portion of the control shaft, a gripping end portion for rotating the control structure between first and second positions and an intermediate portion; first and second locking structure circumferentially spaced on the body at locations corresponding to the positions of the intermediate portion of the handle when the control structure is in the first and second positions, respectively; a slider member slidably mounted on the intermediate portion of the handle for reciprocative movement between locked and unlocked positions; interlocking structure for cooperating with the first and second locking structure, when the handle is in the first and second po

Abstract: A device for limiting rotary movement in two directions comprising a housing (18) having a wall (17). A first stationary component (10) is attached to the wall (17) of the housing (18), the first stationary component having an arcuate segment (11) defined by lateral surfaces (11a, 11b) limiting the arc length thereof. A shaft (14) is rotatably mounted in the first component (10). A second component (20), also having an arcuate segment (21) defined by lateral surfaces (21a, 21b) limiting the arc length therof, is attached to the shaft. The first and second components (10, 20), respectively, have the same shapes and sizes and each of them is provided with a bearing (12, 22) which defines a bore (12a, 22a) and is molded on the arcuate segment (11, 21). Pins (11c, 21c) are positioned, respectively, to extend from oppositely directed faces of the arcuate segments (11, 21). The lateral surfaces ( 11a, 11b; 21a, 21b) of the first and second components (10,20) form abutments acting on both sides.

Abstract: A lever-operated rotary valve having a rotary body for permitting fluid flow therein includes a locking device for selectively locking and unlocking the operating handle such that the operating handle of the rotary valve can be locked in a plurality of predetermined positions. The operating handle of the rotary valve can be oriented in any one of a plurality of positions and locked in that position without requiring the removal of the locking device. The locking device is an L-shaped member which fits on the stem of the rotary valve and includes aligned holes for receiving a padlock so that the locking device and handle are locked together.

Abstract: A self closing valve assembly is disclosed. A retainer member provides support for a spring for biasing the valve actuating cam members as well as providing a valve seat. The component parts are housed in a cartridge for easy placement in a faucet as well as for conversion of other faucets to the self closing type. Opening of the valve is accomplished by only a rotary motion of the valve stem without an axial handle motion.

Abstract: A screw type valve for the delivery of water in hydrosanitary installations with superimposed ceramic sealing disks, a fixed one (13) and a rotating one (15). The valve also comprises a sleeve (11) fitted into an externally threaded ring (10) and with a bottom ring (12) bearing the fixed ceramic disk (13), a driving spindle (14) with said movable ceramic disk (15) on its bottom rotating inside said sleeve, while on its top end a control handle is fitted, said sleeve, ring and spindle being made of a plastic material, while the threaded ring is made of metal to allow a safe installation of the valve.

Abstract: A single-handle faucet has a valve, a connecting rod and a handle on the connecting rod which can be pivoted between an OFF position and a full ON position. The handle is movably mounted on the connecting rod. When the handle is moved to a first position, the handle is prevented from pivoting past an intermediate position between the OFF position and the full ON position. When the handle is moved to a second position, the handle can be moved to the full ON position.

Abstract: An indicator for measuring the amount of closure of a valve with a valve handle mounted adjacent a valve bearing housing. A pointer for the indicator being mounted between the valve handle and valve bearing housing. To show the amount the valve is open the indicator pointer is firmly attached to the valve drive shaft. A slot is provided in the valve handle so that the relationship of the indicator pointer to the valve bearing housing can be seen, and rotation stubs are included on the valve handle which can abut against the indicator pointer so the valve drive shaft can be turned using the valve handle.

Abstract: A spring loaded locking handle assembly for an angle cock or the like wherein the helical windings of a torsion type spring are mounted on a fulcrum pin about which the handle proper of a two-piece, locking style handle assembly is pivotally connected to the handle socket. One leg of the torsion spring is fixed to the socket via a pilot hole therein and an aligned index hole in the fulcrum pin to properly locate and secure the fulcrum pin in place. The other leg of the torsion spring bears against the handle proper under tension to positively maintain the handle member in its locked position and to prevent accidental operation of the angle cock.

Abstract: A control valve for use in plumbing fittings such as shower control valves or the like includes a housing, a valve member within the housing, and a handle attached to the rotatable stem of the valve member. The handle and valve stem are rotatable relative to the housing to control discharge from the valve. There are cooperating stops on the handle and housing limiting rotation of the valve stem. The improvement comprises a device for retarding rotational movement of the handle and stem relative to the housing.

Abstract: A water flow regulating device which comprises a casing having a control chamber at the upper middle for holding a regulating valve and a division wall at the lower middle to block up the water outlet from the water inlet thereof. A teflon washer is set inside the control chamber and squeezed by the regulating valve, which has two through-holes disposed in alignment with the two through-holes on the bottom of the control chamber respectively in communication with the water inlet and the water outlet. The regulating valve is secured to the casing by a lock nut and is confined by a control ring to rotate on the teflon washer within a fixed range for controlling the alignment of its two through-holes with the through-holes on the teflon washer and the through-holes on the control chamber so as to regulate water flow rate from the water inlet into the water outlet.

Abstract: A tamper-proof locking mechanism for a rotatable control device, such as a quarter turn valve including a valve member connected to a stem journalled in a body housing the valve member and an operating handle connected to the stem for rotating the valve member between open and closed positions. The locking mechanism includes a pair of lugs on the valve body at circumferentially spaced locations corresponding to the locations of an intermediate portion of the handle when the valve member is in the open and closed positions. A slider member is slidably mounted on the intermediate portion of the handle for reciprocative movement between a locked position and an unlocked position. The slider member includes a latch element having an open portion for receiving the lugs and arranged to restrain both rotational and axial movement of the handle when the handle is in the open or closed position and the slider member is in the locked position.

Abstract: A fluid control valve is disclosed. Preferably, a plastic body member of the cartridge is provided. A valve stem is provided that includes a pair of metal stop elements extending radially outward. A metal stop table is mounted around the stem to limit rotational movement of the valve stem through contact with the stop elements. The legs have radially-projecting extensions which are designed to fit in recesses within the valve housing to prevent rotation of the stop table. Excess rotational forces applied to the valve stem after the cartridge reaches a fully open or closed position are translated through the stop table and directly into the valve housing without stressing the plastic body member.

Abstract: A metering apparatus and system for controlling the administration of IV fluids having a valve housing with a valving chamber therein. A rotatable valve body member is positioned within the valve chamber and a valve passageway of variable cross-sectional area is provided at either the chamber or on the valve member. The effective area and length of the valve passageway interposed between the inlet and outlet to the valve is adjustable to regulate flow by moving the valve body relative to the valve member. Various accessories can be selectively attached to the basic valve configuration including a backplate which facilitates single-handed operation and an optional cover plate which may be secured to the backplate to provide security from patient tempering. In the preferred embodiment the valve housing and internal valve members are fabricated from dissimilar plastic materials of different hardness to improve the sealing therebetween.

Abstract: Improved ball valve for refrigerating systems, formed by a valve body and an inlet duct and an outlet duct. The other component parts such as a ball shutter, a circular flange, a closure member, an actuating means and sealing means are all mounted by introducing them from the above.In this ball valve the operations of replacing the components are very much simplified, rapid and economical.

Abstract: An air valve for controlling the supply of air to a venturi jet of a spa includes a housing, a cylindrical barrel, means for sealing between the housing and the barrel, and means for rotating the barrel. The housing has an interior chamber extending between an open, cylindrical bore at one end and a pipe coupling at the other end. The housing mounts on the inside wall of the spa, with the open end of the bore facing the inside of the spa and the rest of the housing extending through the side wall and positioned outside the spa. The cylindrical barrel is insertable into and rotatably mounted within the cylindrical bore of the housing. The housing and barrel each include ports that, when overlapping, provide a path for air to flow from a point exterior of the housing, through the overlapping ports, through the interior of the barrel and housing to the pipe coupling. Rotating the barrel to a position where the ports do not overlap blocks the air flow path.

Abstract: A mixing valve (10) has a modular cartridge (60) rotatably mounted in housing (12). The cartridge has a bottom volume control valve plate (58) attached to a lower section (62) housing a pressure balance valve (80). The lower section (62) is secured to an upper section (120) that rotatably receives a temperature control plate (150). The plates (58) and (150) are both rotatable about a common axis (64). The plate (58) is controlled by operation of stem (180) attached to handle (34). The plate (150) is controlled by stem (160) which is operated by knob (38). An insert (250) allows the knob (38) to operate even when hot and cold water supplies are inverted. A splined hot water stop ring (228) sits in handle (34) and adaptably limits rotation of knob (38) for a selected maximum water temperature. Outer seals (58) assure that all water flows through cartridge (60) when the volume is set for partial flow.

Abstract: An improved valve apparatus and a method of operation thereof having a spring retainer member means suitable for accommodating a spring means therein for operably coupling thereabove a pipe coupling body means are disclosed. Inside the pipe coupling body means is a ball headed member means having an aperture passing therethrough for blocking off or allowing passage of medium through the pipe coupling body means. The spring retainer member means is turned in one direction in order to allow unimpeded passage or to control the amount of flow thereof of said medium and can be rapidly and efficiently sprung back to its original position in order to completely block off the passage of said medium through the pipe coupling body means for a rapid and efficient "on-off" control thereof.

Abstract: A pressure filter assembly having a bleed valve assembly for releasing trapped gas from with the filter chamber in a controlled manner. The bleed valve assembly includes a stem secured to the filter assembly having a bore therethrough for communication with the filter chamber and a cap for controlling the release of trapped gas within the filter chamber. The cap has a plunger with a contact surface which mates with a portion of the inside surface of the stem bore and an extension which fits with a narrow portion of the bore.

Abstract: A ball valve of the type comprising a body including a valve chamber having inlet and outlet ports, and a rotatable ball element disposed within the valve chamber, the ball defining a conduit communicating with the inlet and outlet ports. The ball is actuated by a control lever to rotate between a first open position and a second closed position of the valve; a manually operable lock is provided to retain the control lever and the ball element in those first and second positions and in at least one intermediate operative position.

Abstract: A ball valve with a built-in check valve includes a valve casing having a passageway for a fluid, a ball having a through hole formed therein, also having a valve seat formed inside thereof at a position in the vicinity of one end of the through hole, and rotatably housed in the valve casing so that the through hole is capable of communicating with the passageway, a guide bush provided within the through hole for guiding the check valve, a spiral spring wound on the guide bush for biasing the check valve in the direction of forming a seal contact between the check valve and the valve seat, and rubber or resin damping members attached to the check valve. The check valve is received within the through hole for cutting off the communication between the passageway and the through hole and preventing a counter flow of the fluid, and has a sealing contact portion and a shoulder portion.

Abstract: A water hydrant specifically adapted for use in domestic and non-domestic water systems for commercial, institutional and residential use with the water hydrant including a unique valve structure incorporating ceramic components and a unique actuating structure requiring only a quarter turn of a valve operator in order to move the valve from a fully open to a fully closed position. The valve operating mechanism includes an elongated operating rod extending through a casing installed in a wall of a building and having a fitting for a garden hose. The valve structure itself includes a valve body having an arcuate slot-like structure therein to receive a projection on the valve actuator to limit the rotational movement to one-quarter turn when moving the valve components from fully open to fully closed position.

Abstract: A butterfly valve having a two piece body, an annular seat carried in the body and a disk mounted in the body for rotation within the seat. An indicator plate mounted at one end of the body and a valve actuator attached to the disk shaft and overlying the plate with a detent arrangement for indicating valve position. Outlet nozzles carried on the disk with a flow path from the exterior of the valve to the nozzles for introducing fluid flow into the pipeline, with check valves in the valve body and in the nozzles. A special disk configuration for reducing damage to the disk edge.