Abstract: A rotary channel-selector valve is provided, which includes: a valve-seat plate covering one end of a cylindrical valve housing and provided with low and high pressure ports and two switching ports all connecting the inside and the outside of the valve; and a main valve element accommodated in the valve housing and provided with low and high pressure connecting grooves on one end surface thereof, wherein one (or the other) of the switching ports communicates with the low pressure port through the low pressure connecting groove and simultaneously the other (or one) thereof communicates with the high pressure port through the high pressure connecting groove at a first (or second) channel-switching position of the main valve element.

Abstract: A double lobed seal comprises first and second annular seals, each having a radially inwardly projecting annular lobe that engages against a sealing surface of a valve element in a valve housing to seal the valve element in its closed position. With increasing fluid pressure exerted on the dual lobe seal, the upstream seal is compressed and moves radially away from the valve element sealing surface. This movement allows the fluid under pressure to enter a void between the two annular seals. The increasing fluid pressure in the void exerts a compressive force on the downstream annular seal that causes its annular lobe to move radially inwardly increasing the force of its sealing engagement with the disk valve sealing surface. In this manner, the dual lobe seal increases its sealing effectiveness when subjected to increasing fluid pressures.

Abstract: A seal for a shut-off device moved in a rectilinear manner, which is switched from a closed to an open position and vice versa so as to shut off material flows. The seal is formed of metallic components which define a pressure chamber to which external pressure can be applied to achieve seal tightness. Employing only metallic components makes it possible to use the seal in a wide temperature range and under conditions of exceptional wear caused by either frequent actuation or the composition of the flowing medium. The sealing system includes a shut-off device (1) against which a movable seat (5) forms a seal. The seat is connected to the tubular casing (2) in a pressure tight manner, and the casing in turn is connected to a flange (3). The assembly is connected to a housing (8) by a flange (6) and is sealed by seal (7). Membranes (9, 10) and support plate (14) form a pressure chamber (11) to which pressure Ps is applied through connecting nipple (13) and bores (12).

Abstract: A variable load mechanism for use in a valve seals the flow of a switched fluid. The flow passes through the mechanism in a region which includes shear seal surfaces. The lives of the components of the valve are extended by limiting the range of excursion in response to valve seat forces. The valve element is provided with a first force from a stack of Bellville washers, for example. A second force acts on the valve element through the spring and is determined by fluid pressure.

Abstract: A vacuum holder for use with an automated carton erecting and packing line and mountable on a rotary carton placer for removing cartons into which product is to be placed includes vacuum cup for removing a carton from a store of cartons. The cartons including a foldable flap. The vacuum holder includes a set of vacuum cups that will engage a flap and at an appropriate time in the carton erection sequence will be positively actuated under control of a power actuator to fold the flap to a desired position prior to depositing the carton on a conveyor line. A rotary manifold carries both vacuum for vacuum cups holding the carton, and fluid pressure for the power actuators to the rotating carton placer.

Abstract: This invention relates to a circuit breaker for an installation handling pressurized fluid comprising an internal valve, at least one joint of substanially toroidal shape being disposed in an accommodating housing around said valve and/or a member for maneuvering the valve, characterized in that the housing is connected, via at least one fluid-circulation channel, to a counter-pressure zone formed downstream of the joint around the valve or the maneuvering member. During a transitory phase of opening of the valve, a preferential flow circuit of the fluid is arranged between the housing and the counter-pressure zone through the channel. Thanks to the counter-pressure exerted on the seal, the latter does risk being dislocated with respect to its housing.

Abstract: A flow control valve for allowing the flow to be controlled on a proportional basis using a direct current(DC) motor thereby improving the flow control function. The flow control valve is constructed in a manner that a valve housing having a guide space and an inlet and an outlet is formed on the both sides of the valve housing, the inlet and the outlet being in communication with each other through the guide space. A spool is installed inside the guide space of the valve housing and up/down movably coupled therein so as to control the opening of the outlet. A spool guide is placed on the upper side of the guide space passing through liquified coolant by moving up/down along with the spool. A elastic support elastically supports the spool guide to one direction. A sealing member prevents the leakage of liquefied coolant by surrounding the spool on the lower side of the valve housing. A driving mechanism moves the spool up/down by use of a DC motor.

Abstract: A valve including a housing, a rotatable body which can turn inside the housing, and two sealing rings made of sealing material, preferably polytetrafluoroethylene or a similar plastic. The sealing rings are arranged in an axially spaced manner in the housing and rest against the spherical outer surface of the rotatable body and provide a sealing function. The valve is designed with at least one sealing ring having a sealing lip which lies essentially tangential to an outer surface of the rotatable body at a contact surface, and a junction region of the sealing lip is located on a radial interior of the valve housing and is attached to a base body of the sealing ring. The valve is designed such that increased pressure causes the tangential contact surface of the sealing lip to be urged radially inwardly against the rotatable body so that the rotatable body is supported by the junction region in cases of high stress. In this way the rotatable body can be operated with reduced and reproducible torques.

Abstract: A balanced valve for flows operated by the axial driving of a stem which commands a sealing body liable to axially slip between an opened position far from the valve seat and a closed seal in contact with the valve s eat. The valve basically consists in a valve body having an inlet opening for the flow with a valve seat at the bottom. The valve body also has an opening for the flow outlet oriented in a substantially cross-section way to the flow inlet. Between the inlet and outlet of flow there is a cylindrical cavity with a ring-shaped broadening in the zone communicating with the flow outlet above the valve seat. There is an elastomeric sealing body located inside the cylindrical cavity, which is mainly made up of a relatively solid sealing end, with a slightly greater height than the height of the ring-shaped broadening of the cylindrical activity.

Abstract: In a device (1) for supplying a pressurized medium from a fixed component (2) into a rotating component (3) with a radially aligned sealing gap (11) provided between the components and in which the fixed component (2) comprises two rings (12, 13), the ring (13) delimiting the sealing gap (11) being held in an axially movable arrangement and with at least one control pressure chamber (35) provided between the two rings (12, 13), the movable ring (13) has an intermediate pressure chamber (31) on its end surface (16) facing the sealing gap (11) with this intermediate pressure chamber (31) being permanently connected to the control pressure chamber (35) by means of ducts (36, 37) worked into the axially movable ring (13).This embodiment allows the width of the radial sealing gap (11) to be set automatically, thereby practically precluding metal-on-metal friction between the components (2, 3) in the area of the radial sealing gap whilst only small leakage oil losses have to be accepted.

Abstract: Apparatus and methods are disclosed for a valve seat wherein the geometry of the seat is such that the resultant axial forces due to the differential between internal and external pressure across the valve seat result in a resultant axial force that urges the valve seat into sealing engagement with the plug or other type of closure member, regardless of the direction of the differential pressure. Thus the valve seat is urged against the closure member regardless of whether the line pressure or bonnet pressure is higher. In the same manner, a resultant axial force urges a seal seat of the preferred embodiment into sealing engagement with the valve body. An axially moveable seal bearing ring is positioned between the valve seat and the seal seat that alters the effective geometry of the seat elements when it moves between a first position and a second position. The seal bearing ring moves responsively to the direction of the differential pressure across the seat elements.

Abstract: Isolation valves for selectively sealing a first region from a second region. A gate valve can include a housing which defines a channel between the first and second regions. The valve includes a gate, located in the housing, and displaceable between a stowed position and a deployed position. When the gate is in the stowed position, communication is permitted between the first and second regions. When the gate is in the deployed position, the gate spans the channel and can be controlled to isolate the first and second regions. The valves can be used, for example, in connection with systems for processing large glass substrates. The valves are particularly useful for isolating long rectangular openings, such as the openings in substrate processing chambers. Isolating processing chambers or load lock chambers from one another, for example, in a linear system, is facilitated.

Abstract: A water-sealing switch structure of wall-type faucet, including a main body, a pull rod, a water sealing seat and a water sealing ring. A front end of the main body is formed with a spout. An inner rear side of the spout is disposed with a close wall formed with a water outlet. Two sides of the spout are respectively disposed with two restricting plates. A top edge of inner front side of the spout is disposed with a guide post formed with a through hole. An upper end of the pull rod is disposed with an enlarged head section. A lower end of the pull rod is disposed with a tapered conic post. An upper side of the conic post is formed with a small diameter engaging section. A lower end of front side of the water sealing seat has a projecting U-shaped engaging seat. A rear side thereof is disposed with a projecting ring. An inner lower edge of the projecting ring is disposed with a draining channel.

Abstract: A device for closing an opening of a tank or a tubular conduit and including a plate for closing the opening and movable substantially perpendicular to a plane of the opening toward the opening to be pressed against a wall in which the opening is formed and away from the opening, and displaceable, in its position in which it is spaced from the opening, substantially parallel to the plane of the opening, first and second piston-cylinder units for displacing the closing plate parallel to the plane of the opening and perpendicular to the plane of the opening respectively, with each piston-cylinder unit having a housing with a cylinder bore and at least one piston displaceable in the cylinder bore relative to the housing, and conduits for communicating pressure medium to the cylinder bores of both piston-cylinder units for displacing respective pistons in respective bores.

Abstract: A valve for feeding abrasive particulate material to, and removal of particulate material from a pressurized vessel, adapted to operate at temperatures above 500.degree. C., comprises a valve structure wherein a single shutoff member of generally spherical shape performs both functions of shutoff the particulate material and the gas-tight sealing by means of a resilient inflatable circular seal element which engages the convex side of said shutoff member. Said seal element is inflated and cooled by a pressure regulated and continuously flowing stream of liquid water. The seal element is protected from being damaged at high temperatures by contacting it with the cooled shutoff member when the valve is closed and with a cooled circular extension of the shutoff member when the valve is open.

Abstract: An automatic center cavity equalizing valve for equalizing pressure in a main valve. The equalizing valve includes a body with a bore for providing fluid communication between an upstream port and a center cavity port, and a downstream port and the center cavity port. A metal ball is disposed within the bore and is arranged to mate with upstream and downstream seats to seal communication with the upstream or downstream port and the center cavity port depending upon the differential pressure across valve. The metal ball is spring biased against the downstream seat to prevent damage to the downstream seat due to rattling. In addition, access plugs are provided at opposite ends of the bore to allow for access to the interior of the bore for repairing or replacing the metal ball, the seats, and/or other internal components.

Abstract: A sealing member 10 for a valve 12 includes a body 14 defining a cavity 16 and, a resiliently deformable membrane 18 extending across a lower end 20 of the body 14. The membrane 18 is provided with an aperture 22 through which fluid can flow to enter the cavity 16. The valve 12 typically has an inlet 24, an outlet 26, and a seat 28 through which fluid must flow in order to pass from the inlet 24 to the outlet 26. The sealing member 10 is configured to seal against the seat 28. When the sealing member 10 is seated on seat 28 to at least partially seal the valve 12, fluid enters the cavity 16 through aperture 22 and, by action of fluid pressure in the fluid, forces the resiliently deformable membrane 18 against the valve seat 28 to further seal the valve 12.

Abstract: A slot valve assembly (10) including a housing (11) having a central opening (19), a valve plate (32), a strongback (20) for carrying the valve plate, a pair of actuators (34, 36) for raising and lowering the strongback to position the valve plate over opening (19), and a second set of actuators (240) for moving valve plate (32) into seating engagement with housing (11). Second actuators (240) are in fluid communication with the working chambers (48, 50) of the first pair of actuators (34, 36). First actuators (34, 36) are located within housing (11) to give the housing a much shorter height.

Abstract: A rotary coupling for communicating a pneumatic signal from a stationary pneumatic source to an apparatus. The rotary coupling has a housing and a rotating portion that rotates with respect thereto. The housing has at least two inlets in fluid communication with the pneumatic source. The rotating portion has at least two outlets in fluid communication with the apparatus. Inlet and outlet pairs are aligned radially relative to an axis of rotation of the rotating portion so that they are in fluid communication when the rotating portion is at an angular orientation at which the inlet and outlet pair are coincident. More than one inlet may be paired with an outlet, and vice versa. Channels can be formed to allow the inlet and outlet pairs to be in fluid communication when they are not coincident. Inlets and outlets can also be radially spaced different distances from the axis of rotation such that fluid communication between these inlets and outlets are blocked at all angular orientations of the rotating portion.

Abstract: A rotary valve is provided including a valve element mounted within the flow path of a valve body and rotatable about a stem axis. A peripheral seating surface on the valve body surrounds the flow path through the valve body and is spaced from the stem axis for sealing engagement with the valve element when rotated to its closed position. The peripheral seating surface on the valve body is preferably annular, and more preferably has an arcuate cross-sectional configuration and includes a central annular seating line spaced closer to the center point of the valve than adjoining upstream and downstream portions of the seating surface. The valve element includes a rigid body with a peripheral resilient overlay. The resilient overlay has a peripheral pressure-responsive sealing member for flexing in response to fluid pressure into sealing engagement with the seating surface.

Abstract: In an air duct selector, a supporting member has a grid shape, and is formed with four penetration holes. Since a film member is affixed to two fitting portions which are arranged on two ends of the supporting member, the film member is fixed on the supporting member. The supporting member and the film member are arranged in a duct to move in a vertical direction. When air flow is blown against the inside surface of the film member through the penetration holes 24a.about.24d, the film member is bent to swell against the film member, and presses against a peripheral portion of a cool air bypass opening portion to entirely cover the cool air bypass opening portion.

Abstract: According to the present invention, in an air conditioner for a vehicle, when the cool air passage is opened, the sliding door slides so as to incline with respect to the flowing direction of the cool air in such a manner that an end portion of the sliding door at a side of said cool air passage is located at the most air downstream side. That is, when the sliding door is controlled to fully open the cool air passage (i.e., the warm air passage is fully closed), for example, in the maximum cool mode, the sliding door slides while inclining with respect to the flowing cool air. In this operation, the air is blocked from flowing into the warm air passage, and such air is smoothly guided into the cool air by the sliding door, because the sliding door inclines with respect to the flowing direction of cool air, thus increasing the amount of cool air into the passenger compartment.

Abstract: A switching valve comprises a valve body to which a plurality of fluid passages are connected, a slider having a gas passage capable of selectively connecting two fluid passages, a balance port for letting the gas passage communicate with the outside of the slider, a pilot valve for opening and closing the balance port, a moving mechanism for moving the pilot valve and the slider as one body in a predetermined direction alone, and a forwardly and reversely rotatable motor unit for driving the slider to open the balance port, thereby canceling a pressure difference between the inside and outside of the slider and then moving the slider to switch the fluid passages.

Abstract: A submersible cleaner adapted for travelling across surfaces of swimming pools and which avoids significant wear on an associated suction pump includes a housing with a forward edge, a suction chamber within the housing and a vibratory oscillator positioned within the suction chamber to continuously vibrate the cleaner during operation. A shoe member is removably fitted to the bottom of the housing and has rows of segmented tread elements which are elongated in a direction parallel with the front edge of the housing and which are angled rearwardly from the bottom with respect to the direction of travel in order to cooperate with the vibratory movement and urge the cleaner along the direction of travel.

Abstract: A gate to block fluid flow in a large conduit with the packing provided by fire hose or other tube extending though a U-shaped channel along the interface of the gate and the conduit surface. The tube can be a plain tube retained in the channel by retaining members attached to sides of the channel.

Abstract: A rotary valve is provided including a valve element mounted within the flow path of a valve body and rotatable about a stem axis. A peripheral seating surface on the valve body surrounds the flow path through the valve body and is spaced from the stem axis for sealing engagement with the valve element when rotated to its closed position. The peripheral seating surface on the valve body is preferably annular, and more preferably has an arcuate cross-sectional configuration and includes a central annular seating line spaced closer to the center point of the valve than adjoining upstream and downstream portions of the seating surface. The valve element includes a rigid body with a peripheral resilient overlay. The resilient overlay has a peripheral pressure-responsive sealing member for flexing in response to fluid pressure into sealing engagement with the seating surface.

Abstract: An isolation gate and frame assembly has a frame having a frame sealing surface extending around the frame and a fluid impervious gate having a gate sealing surface complementary to the frame sealing surface extending around the gate. One of the first and second sealing surfaces carries an inflatable seal. A mechanism is provided to locate the gate within the frame with the first sealing surface sealed against the second sealing surface.

Abstract: A self wear compensating valve for controlling flow of a fluid employs seals for sealing between relatively moving parts. In one of the parts, an annular recess is formed. A conformable sealing member is placed in the recess, and a spring biased to expel the conformable sealing member and press it against a sealing surface on the other part is provided. An O-ring placed on the outside of the conformable sealing member prevents leakage of fluid through the recess outside of the conformable sealing member. As the conformable sealing member is worn away, after many cycles of the valve, the spring continues to press it against the sealing surface, while the O-ring continues to prevent leakage of fluid outside the conformable sealing member. A rotary valve suitable for railroad brake applications is provided, which controls flow of fluid from a supply to the brake cylinder, and provides for exhaust of fluid from the brake cylinder. The valve has a supply port, a delivery port and an exhaust.

Abstract: According to the present invention, in an automotive air conditioner system, a link mechanism is provided by using a cool air passage provided in parallel with a warm air passage and a cool air/heated air mixing chamber provided at a downstream side of the warm air passage and the cool air passage. The clearance between a sliding door and a cooler can be set to a minimum distance as required. Further, it is not necessary to ensure a space for installing the link mechanism outside the case of the air conditioner. As a result, the size of the air conditioning unit including the sliding door can be effectively reduced.

Abstract: According to the present invention, a sliding door is positioned between the cooler and the heater and slidable in a direction crossing both the cool air passage and the warm air to control each amount of air flowing to the warm air passage and air flowing to the cool air passage, and the sliding door slides vertically in such a manner that an upper portion of the sliding door inclines toward the cooler. Since the sliding door slides itself in the vertical direction, with the upper portion of the sliding door inclined to the cooler, condensed water, which is likely to move with the blown air from the cooling unit to the air downstream side, can be smoothly guided downwardly with the air flow along the inclination of the sliding door, thus preventing the stench caused by mold and corrosion of the heater.

Abstract: A cleaner for swimming pools includes a housing having a pressure differential chamber with an opening defined by opposing walls and an oscillator pivotally mounted within the opening on a pivot axis extending between the walls. A seal is loosely fitted within a recess along a side of the oscillator for movement outwardly across a gap between the oscillator and the wall of the opening to close the gap when necessary for purposes of starting the oscillator and for opening the gap when required to allow grit, leaves and the like to pass through.

Abstract: A ball valve disclosed herein is low cost and offers a fast and reliable valve operation. Furthermore, the actuating force the ball valve requires, when it is shut off, is small. The ball valve is capable of fine adjustment of the flow. The ball valve comprises a valve casing defining a flow path of a fluid, a valve seat disposed in the midway of the flow path, a valve element which is in engagement with the valve seat or out of engagement with the valve seat, to shut off the flow path or to regulate the flow rate in the flow path, a control rod inserted into the valve casing and movable upward and downward, and a connecting rod, one end of which is rotatably supported at the inner end of the control rod, and the other end of which is connected to the valve element. The valve element comprises a communication path which communicates with both the upstream side of the flow path and the downstream side of the flow path and an on-off means for opening or closing the communication path.

Abstract: A safety relief valve (12) for a pressure vessel (10) in which the main valve member (28) includes a valve plate or disc (52) and a retainer plate (64) having a flexible membrane or diaphragm (62) stretched therebetween in a taut relation to provide a frusto-conical shape (FIG. 3) for obtaining bubble-tight sealing against valve seat (26). A fluid chamber (116) is provided between valve plate (52) and retainer plate (64) and inlet fluid pressure is communicated through opening (118) of jack screw (106) to the fluid chamber (116) for providing inlet fluid pressure thereto to force valve plate (52) and retainer plate (64) apart for tensioning of flexible membrane (62) into a frusto-conical shape. A jack screw (106) is threaded within a bushing (94) carried by retainer plate (64). Upon rotation of jack screw (106), valve plate (52) and retainer plate (64) are forced away from each other for tensioning flexible membrane (62) into a frusto-conical shape.

Abstract: A self-propelled submersible suction cleaner as used to clean the surfaces of a swimming pool transfers a vibratory movement of an oscillator located within the flow path of a suction chamber for propulsion over the submerged surface of the pool. This vibratory movement of the oscillator is also converted to a unidirectional rotational motion used in conjunction with a gear train to cause the cleaner to rotate through at least a 90 angle allowing the cleaner to improve on the random path taken by the cleaner and to maneuver away from obstacles such as pool steps potentially stopping the cleaner movement. The cleaner includes a elevation limiter that keeps the suction chamber submerged as the cleaner climbs a vertical wall and attempts to rise above the water level in the pool. A pressure relief valve eliminates the concern over debris blocking the suction and causing potential damage to the pool pump and motor.

Abstract: A submersible suction cleaner includes a chamber, an oscillator pivotably mounted within the chamber for movement to and fro with a gap between an edge of the oscillator and a wall of the chamber through which water containing grit flows during operation. The chamber wall or the oscillator has a slidable, retractable seal operable to open when grit lodges between the oscillator and the chamber wall to thereby open the gap and allow the passage of grit therethrough.

Abstract: Low particulate slit valve system and method for controlling the closure pressure applied to a slit valve. An apparatus in accordance with the present invention includes a barrier having a slit valve aperture, a valve seat surrounding the aperture, a closure movable towards and away from the valve seat, a sensing mechanism for determining the pressure differential on the two sides of the barrier, a processing unit responsive to the pressure differential and operative to produce a control signal, and a valve actuator responsive to the control signal and operative to control the force applied to the closure. The method of the invention includes determining a first fluid pressure on a first side of the barrier, determining a second pressure on a second side of the barrier, and applying a closure pressure to the closure which is related to the pressure differential between the first fluid pressure and the second fluid pressure.

Abstract: A sealing arrangement for a valve or shaft is disclosed which is designed to respond to movements of a rotatable element in a particular manner and to increase sealing pressure with increasing fluid pressure. The seal undergoes a radial compressive type movement as the pressure within a vessel housing increases between opposed sealing sleeves and this causes an increase in the sealing pressure. This predetermined movement of the seal creates a spring bias in the seal, urging the seal to return to the original, less stressed condition. Preferably, the seal is of a composite structure and a particular component of the intermediate wall section creates this spring bias. This structure has improved operating characteristics and accommodates a wider range of resilient materials to be used for the sealing washer.

Abstract: The invention comprises a reusable closure for temporarily sealing a container to prevent escape of liquid and gas from the container with the closure having a molded, one-piece housing having internal threads for securing the housing to a container and a spout for discharging materials therefrom and an integral tapered sealing ring to prevent materials from escaping from the housing with the housing including a frusto-conical seat for engaging a valve stem with flared skirt for temporarily sealing liquid and gas within the container and a resilient push top, located on top of the housing for finger access by the user with the valve stem connected to the underside of the push top, valve stem axially displaceable to permit sealing and resealing of the skirt against the frusto-conical seat in the housing and the resilient push top providing a restoring force to return the valve stem and skirt to a closed condition where the fluid pressures within the container coact with the skirt to prevent escape of liquids o

Abstract: A rotary face valve for beverage filling machines provides a housing assembly defining a closed chamber. The stationary valving surface is provided open to the chamber, and a valve rotor is journaled in the chamber in engagement with the stationary valve surface. The chamber is pressurized to a pressure closely approaching the pressure of the beverage being valved so that a low differential pressure exists between the chamber and the port through which the beverage flows. This minimizes the tendency to encounter leakage. The rotor is supported by a shaft which is journaled in spaced bearings so that eccentric force applied to the operating shaft is absorbed by the bearings and is not transmitted to the rotor. Further, the rotor is connected to the operating shaft with sufficient freedom to ensure that the rotor properly engages the valve surface in a uniform manner.

Abstract: A rotary face valve for beverage filling machines provides a housing assembly defining a closed chamber. The stationary valving surface is provided open to the chamber, and a valve rotor is journaled in the chamber in engagement with the stationary valve surface. The chamber is pressurized to a pressure closely approaching the pressure of the beverage being valved so that a low differential pressure exists between the chamber and the port through which the beverage flows. This minimizes the tendency to encounter leakage. The rotor is supported by a shaft which is journaled in spaced bearings so that eccentric force applied to the operating shaft is absorbed by the bearings and is not transmitted to the rotor. Further, the rotor is connected to the operating shaft with sufficient freedom to ensure that the rotor properly engages the valve surface in a uniform manner.

Abstract: The disclosed valve provides a seal between the valve plug and the valve body to substantially prevent leakage therebetween when the valve is in its closed position. The seal can be arranged for minimizing the net forces acting on the valve plug to close the valve or to keep the valve closed; thus, the net result is a smaller valve actuator. Furthermore, the seal can be arranged to withstand high temperatures.

Abstract: An improved rotary plug valve of the type having a valve body with a fluid inlet conduit and a fluid outlet conduit therein has a rotary plug disposed for rotation in the valve body between an open position and a closed position. In the closed position the plug has a seat seal disposed in a groove in the cylindrical surface thereof which seat seal extends adjacent and surrounds the fluid inlet conduit to seal the inlet conduit against fluid flow. The groove in the plug has a radially inner wall, a radially outer wall and a base wall. The base wall extends at an angle so that the radially outer wall extends more deeply into the plug than the radially inner wall. Preferably the groove and the seat seal have an annular, cylindrical shape. Also preferably the seat seal has a shape so that a pressure space is formed adjacent the base wall of the groove and a gap is formed adjacent the radially inner wall of the groove. Fluid pressure in these urge the seat seal into sealing positions.

Abstract: A disc valve, in which the rotatable control disc (34) is securely held against the fixed control disc (26) with limited forces even when the pressure differences are great. For that purpose, a piston (44) is integrally formed on the rear side of the rotatable control disc (26), which piston is acted upon via a housing channel (66, 72) by the pressure prevailing at the valve outlet (14). The effective pressure-loaded surface area of the piston (44) is slightly smaller than the surface areas of the rotatable control disc (34) that are acted upon by pressure passing through the fixed control disc (26).

Abstract: A distributor body comprises in its contact surface connection grooves which can communicate in different ways, according to the angular position of the body, with intake and outlet conduits. Rotation of the body is controlled by a motor. A stack of elastic washers acting upon a pusher ensures a suitable pressure of the contact surface against a homologous contact surface.

Abstract: A diverter valve for use for domestic household water use which may be operated at a minimal use of manual forces disclosed. The diverter valve generally includes a plurality of water inlet sources opening to an inner chamber. Said inner chamber having a plurality of outlet sources at the base of said chamber, a sealing means communicating with said outlet sources for alternately turning on or off the flow of water from said inlet sources through said outlet sources. The sealing means is urged against the base of said mixing chamber by means of a spring, as well as by the pressure of water from said inlet sources above said sealing means. The sealing means is rotatable as the result of rotation of a spindle. In the preferred embodiment an O-ring is provided to further seal the water away from the inlet source and the outlet source.

Abstract: A diverter valve has an IN port and first and second OUT ports which are positioned along an arcuate path. A rotor has an external control knob and a stem extending within the cavity of the valve body. Mounted on the stem, at right angles thereto, is a closure pin which extends into the bore of the hub of a mushroom-shaped closure element. The surface of the domed head of the closure element is in contact with an O-ring seal at one of the OUT ports. When the rotor is moved, the O-ring, in contact with the surface of the domed head, cams the closure element inwardly causing the element to slide on the closure pin and causing the closure pin to enter more deeply into a recess in the head of the closure element. When the closure element is in place to close-off one of the OUT ports, the other OUT port is opened and the pressure of the water flowing through the valve exerts a direct pressure on the flat annular undersurface of the head of the closure element.

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 seat assembly (28) for a valve member (20) includes a seat carrier (40) defining a pocket to receive a rigid seat ring (42). The outer peripheral surface (56) of the rigid seat ring (42) is spaced radially from the inner peripheral surface (45) of the seat carrier (40) to define a radial clearance therebetween of at least around 0.001 inch per inch of flow passage diameter. The sealing surface (58) of the seat ring (42) extends at 45 degrees to the longitudinal axis of the flow passage and the flexing and expansion of rigid seat ring (42) when the valve member (20) is moved to closed position permit the seat ring (42) to conform to irregularities in the adjacent mating sealing surface.

Abstract: A gate valve provides an efficient and effective seal from high pressures to pressure differentials below 50 psi through a self-aligning gate of reduced mass (semi-gate). The invention provides a transmission between the gate and stem which permits its sealing surface to remain normal to the relative surface of the seat irrespective of pressure, circulation rate, or flow medium (gas or liquid). This is accomplished through the full floating nut element which, when loosely engaged to the stem and inserted into an oversized slot at the upper end of the semi-gate, allows the gate to move axially in the direction of flow without interfering with the vertical movement of the gate by the stem. This feature is accomplished by introducing a clearance between the stem and nut. The gate is of reduced mass to allow a more instantaneous response to pressure transients because of its lighter weight and reduced profile.

Abstract: A valve whose housing has valve spool receiving means arranged in it so that the spool is able to move between two switching positions reciprocatingly and is able to connect valve ducts in the housing with each other for the passage of fluid. For this purpose it has window-like transversely extending passages, through which the fluid may flow between two valve ducts. While offering a low resistance to flow the valve design leads to large orifices. Special means are provided for sealing and the control of frictional forces during operation.