Abstract: A rotary plug valve is disclosed in a preferred embodiment that has two telescoping seat assemblies that fit into respective recesses provided in the valve body surrounding a passageway through the plug valve. A valve chamber is formed in the valve body into which the rotary plug may be positioned to control flow through the valve by rotation thereof. In a preferred embodiment, the telescoping seat assemblies provide an upstream and a downstream seal with the rotary plug. The telescoping seat assemblies preferably function differently when in the open and closed position so that both assemblies expand when in the open position whereas in the closed position one assembly expands and one is compressed A line pressure surface is provided to provide a force against the plug seal seat element. The plug seal seat element and plug mate with a curved surface and the contact stress varies depending on the location along the curved surface.

Abstract: A pressure relief valve has a main valve body, a fluid inlet passageway, a fluid outlet passageway, and a piston contained within the main body. The piston has a piston head, slidingly and sealingly engaged within a pressurized cavity in the main valve body. The piston head's principal face, having a given surface area, is exposed to a pressurized gas in the cavity. A piston stem, connected to the piston head, is in sliding communication with a packoff assembly and has an exposed face whose surface area is smaller than the piston head's principal face. The piston stem's exposed face is in communication with the pressurized gas or fluids to be regulated. In operation, a gas or fluid pressurized to a predetermined value in the pressurized cavity acts against the piston head, forcing one or more ports in the piston stem sidewall to be sealed from the fluid outlet passageway.

Abstract: A gate valve seal for a gate valve including a body having an inlet aperture and an outlet aperture, and a gate closure reciprocally disposed within the body between a closed valve position where the gate closure blocks the apertures and an open valve position where the gate closure does not block the apertures. The seal includes a first resilient seat for placement in the inlet aperture of the gate valve body and a second resilient seat for placement in the outlet aperture of the gate valve body. The seats sealingly engage one another and the gate closure when the closure cycles between the valve positions. Each of the seats includes an inner diametrical surface which generates sealing pressure that increases as internal pipeline pressure increases.

Abstract: A ball valve having an upstream seat (92) with the seat actuated by outside pressure (14, 16). Retraction members (100, 102) continuously urge seat (92) to a retracted position out of sealing engagement with the ball. A sealing member (104) fits loosely within an annular recess in the seat (92).

Abstract: A rotary plug valve is disclosed in a preferred embodiment that has two telescoping seat assemblies that fit into respective recesses provided in the valve body surrounding a passageway through the plug valve. A valve chamber is formed in the valve body into which the rotary plug may be positioned to control flow through the valve by rotation thereof. In a preferred embodiment, the telescoping seat assemblies provide an upstream and a downstream seal with the rotary plug. The telescoping seat assemblies preferably function differently when in the open and closed position so that both assemblies expand when in the open position whereas in the closed position one assembly expands and one is compressed A line pressure surface is provided to provide a force against the plug seal seat element. The plug seal seat element and plug mate with a curved surface and the contact stress varies depending on the location along the curved surface.

Abstract: A rotary plug valve is disclosed in a preferred embodiment that has two telescoping seat assemblies that fit into respective recesses provided in the valve body surrounding a passageway through the plug valve. A valve chamber is formed in the valve body into which the rotary plug may be positioned to control flow through the valve by rotation thereof. In a preferred embodiment, the telescoping seat assemblies provide an upstream and a downstream seal with the rotary plug. The telescoping seat assemblies preferably function differently when in the open and closed position so that both assemblies expand when in the open position whereas in the closed position one assembly expands and one is compressed. A line pressure surface is provided to provide a force against the plug seal seat element. The plug seal seat element and plug mate with a curved surface and the contact stress varies depending on the location along the curved surface.

Abstract: A method and an apparatus for opening/closing a valve are provided. The method includes the steps of varying a position of a seat assembled into an inner side of a fluid passage of a valve body using a pneumatic pressure or a magnetic force so as to be separated from a turning radius of a valve member for opening/closing the fluid passage, rotating the valve member in a forward or reverse direction by an actuator, rotating the valve member in the forward direction and opening the fluid passage, rotating the valve member in the reverse direction, and returning the position of the seat so that an inner side of the seat is sealingly contacted with an outer face of the valve member and closing the fluid passage.

Abstract: A gate valve is disclosed having a telescopingly interfitted seat assembly that fits into a recess in a gate chamber between the gate valve body and the gate. A sealing cavity is formed between two seat elements that form the telescopic connection. A preferably unidirectional seal is disposed therein having two lip seals. The unidirectional seal is preferably oriented to allow leakage for a pressure differential wherein the gate chamber has a higher pressure than the pressure on the opposite side of the seal from the gate chamber. The seal is preferably made of non-permeable material and the material is preferably flexible but non-elastic with little or no memory. Additional such seals may be used for sealing with the gate valve body. In one embodiment, an expansion member is provided for extending into an open end of the seal to expand the two lip seals.

Abstract: A burner isolation valve or gate for use in the coal-delivery pipes of coal-fired power plants. Safety regulations often require that two valves be placed in the coal delivery line between a combustion chamber and an exhauster or pulverizer type deliver source to isolate the section of pipe in between for maintenance and other access. The invention includes a novel valve plate and actuation assembly, a novel housing adapted to sealingly enclose the valve plate, and a novel sealing mechanism for the valve plate and housing adapted to keep coal fines and dust out of the outboard portion of the housing in which the valve plate rests in the valve-open position.

Abstract: The invention comprises a rotary valve having first and second inlet/outlet flow passages, as well as one or more (preferably between 6 and 8) flow ports. The valve has a plurality of positions simultaneously interconnecting the first and second flow passage to selected flow ports. In a preferred embodiment, the valve has a housing and the flow ports are disposed on outer peripheral walls of the housing. The valve may further include an internal rotary plug that is rotatable about a longitudinal axis to move between the positions, and containing openings to connect the flow passages to the flow ports. The plug may be divided into two chambers in the valve which may or may not be moved independently of each other. The valve may further include a movable seal between the housing and the internal plug member which is retractable to permit freer movement of the plug.

Abstract: The invention provides a valve 10,30 for connecting first and second conduits 12,14. The valve 10,30 comprises; a valve member 16 rotatably mounted in a housing 18, to define a space 22 between the valve member 16 and the housing 18; and inflatable seal means 20,32, operable to provide a seal between the valve member 16 and the housing 18. The invention further provides a valve assembly 40 for connecting first and second conduits 12,14. The assembly 40 comprises: a valve member 16 movably mounted in a housing 18, to define a space 22 between the valve member 16 and the housing 18; inflatable seal means 20,32, operable to provide a seal between the valve member 16 and the housing 18; and an air inlet controller 42 for supplying compressed air into the space 22, for driving a pig 44 along the conduits 12,14. The invention also provides methods of cleaning the valve 10,30 and assembly 40 in situ by in-line fluid flow.

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: 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: A metering device includes an inlet and outlet for a material (liquids, gases or solid particles) to be metered, a rotatable ball driven by a shaft and interposed between the inlet and outlet seats. The rotatable ball has a transverse bore containing a sealess shuttling member which can reciprocate back and forth along the bore between two sealing seats so as to seal against one or the other. The sealess shuttling member is propelled by pressurized material which flows into the bore without surface-to-surface contact of the shuttling member with the bore wall until is engages one of the two sealing seats. Each time the rotatable ball rotates 180.degree., a metered shot is ejected resulting in a quasi continuous flow depending upon a rotatable ball revolution rate.

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: A metering device includes an inlet and outlet for a material (liquids, gases or solid particles) to be metered, a rotatable ball driven by a shaft and interposed between the inlet and outlet seats. The rotatable ball has a transverse bore containing a sealess shuttling member which can reciprocate back and forth along the bore between two sealing seats so as to seal against one or the other. The sealess shuttling member is propelled by pressurized material which flows into the bore without surface-to-surface contact of the shuttling member with the bore wall until is engages one of the two sealing seats. Each time the rotatable ball rotates 180.degree., a metered shot is ejected resulting in a quasi continuous flow depending upon a rotatable ball revolution rate.

Abstract: There is provided a gate valve arrangement consisting of at least one sealing ring defining a valve seat, and having a reciprocable gate plate in sealing contact with the valve seat, which effects a pressure seal in one direction on the seat and at the same time allowing the seat to vent in the opposite direction to relieve pressure within the gate valve.

Abstract: A ball valve for controlling fluid flow comprises a housing with a chamber therein and a fluid flow passage therethrough having an inlet and outlet portion to and from the chamber adjacent the lower end of the housing, and generally annular recesses extending about the inlet and outlet ends of its inlet and outlet portions. An opening in the upper end of the housing communicates with the chamber and is sealed by a bonnet which is removably fastened to the housing and has a passage seating a stem which will rotate. A valve member is rotatably seated in the chamber. Body seats are removably seated in the annular recesses of the chamber about the inlet and outlet portions of the flow passage. Valve seats are removably seated in the body seats and have concave surfaces which seat the ball member and seal about the flow passage therethrough. The bonnet has a shoulder about the passage and the stem has a collar thereabout which bears upon a sealing member disposed therebetween.

Abstract: An in-line fuel fill valve assembly which provides for rapid and efficient refueling of compressed natural gas powered vehicles is provided and includes a receptacle adapted to mate with a fuel supply nozzle and a valve body having an in-line gas flow passage therethrough. The gas flow passage has first and second ends, with the first end communicating with the receptacle, and the second end terminating at an outlet which is adapted to communicate with a fuel storage vessel. A check valve is positioned in the gas flow passage of the valve body and is normally biased into a closed position to prevent the flow of gas through the first gas flow passage, but which opens in response to a flow of fuel under pressure.

Abstract: The gate valve 10 suitable for controlling fluid flow into a gas injection well of a hydrocarbon recovery operation includes a thru-conduit valve body 12, a bonnet 30, an operator handle 36 for raising and lowering a gate 22. A pair of seat assemblies 26, 28 are provided on opposing sides of the gate. Each seat assembly seals with a planar face of the gate, and includes a metal seat ring 56 and a pair of concentric face seals 70 and 72 supported on the seat ring. The seal rings are fabricated from a selected plastic material, and may be easily removed and reinstalled on the seat ring for customizing the gate valve for specific applications, and for reduced maintenance. The seat ring 56 is configured to facilitate its removal from the valve body.

Abstract: A balance seal for a valve, said seal comprising an annular seal element retained within a valve housing. The seal element has a seal well which links with the pressure on one side of the valve to urge a flexible seal leg with a foot into engagement with a moveable valve plug. The seal leg is prevented by an annular retainer from over-deflection.

Abstract: This invention relates to a valve assembly for granular and/or abrasive materials. The valves comprises a housing having an inlet and an outlet wherein the ratio of the outlet diameter to inlet diameter is no less than 1:1 for unrestricted flow of materials through the valve assembly. There is an annular recess in the housing adjacent the valve seat containing a resilient inflatable sealing ring, the ring being dimensioned so as to sealably contact the closure member when the closure member is in the first position upon inflation of the ring. A fluid inlet supplies a fluid under pressure to the sealing ring to inflate the sealing ring. A shaft channel and contains an external hub disposed on the outer end of the shaft which hub is dimensioned and arranged so as to engage the housing to restrict longitudinal movement of the shaft in the channel.

Abstract: A high pressure valve is disclosed having dual, independent seat to closure member seals, the dual seal arrangement including a primary seal and a second seal, each operating independently, in proper sequence, each acting in the same direction, and each being pressure actuated, with provision for sealing fluid.

Abstract: A slide valve for pipelines for the transporting of slide-laden gaseous or liquid fluids comprises a slide-valve housing within which a displaceable closure member rests in closing position with its closure surface against an inflated annular packing (66). The annular packing (66) is developed with a circumferential hollow space (82) which is in communication with a connection (78) for a source of pressure. An annular support spring (84) is arranged within the hollow space (82). The spring supports the annular packing (66) in its uninflated starting position, and rests in supporting manner for this purpose with its vertex region directed towards the closure surface of the closure member against the inner circumference of the hollow space (82) of the pressure-relieved, undeformed annular packing (66) which is inserted in the slide-valve housing and rests on all sides against its supporting walls.

Abstract: The metering device comprises a housing, defining at least one inlet for the material to be metered and at least one outlet for that material, and at least one rotatable ball driven by a shaft, the ball having a transverse bore containing a shuttling ball moving linearly in the bore between two seats and seals against the one or the other seat. The rotatable ball is captured between the seats and seals under pressure against the outlet seat. Such a metering device allows an exact metering, in shot or rapid shot resulting in near continuous flow form, has great simplicity of construction with few working parts such as that it may easily be placed at the dispensing end of a pressure transfer system for liquids and gases and acts as shut off valve between metering use such that it prevents stalled hydrostatic fluid pressure behind the metering device from causing a flow surge ahead of the metering device at start up.

Abstract: A high pressure valve is disclosed having dual, independent seat to closure member seals, the dual seal arrangement including a primary seal and a secondary seal, each operating independently, in proper sequence, each acting in the same direction, and each being pressure actuated, with provision for relieving excess fluid pressure.

Abstract: An apparatus for sealing shut-off devices located in gas or liquid transporting pipelines having a sealing arrangement, which seals the shut-off device against a casing, the sealing arrangement having a gasket engageable against the circumferential surface of the shut-off device, a seating ring supporting the gasket, two chambers which can be supplied in a controlled manner with a pressure medium, and a method by which the gasket can be raised from the circumferential surface and pressed against the circumferential surface. The sealing arrangement has a driving member positively connected to the seating ring and a displaceable intermediate piston located on the driving member. The first chamber is located between the driving member and the intermediate piston and when subject to the action of the controlled pressure, brings about a movement of the driving member in the gasket raising direction.

Abstract: A ball valve for controlling fluid flow comprises a housing with a chamber therein and a fluid flow passage therethrough having an inlet and outlet portion to and from the chamber adjacent the lower end of the housing. An opening in the upper end of the housing communicates with the chamber and is sealed by a bonnet which is removably fastened to the housing and has a passage therethrough. A ball member is rotatably seated in the chamber and has a spheroidal lower portion with an anticlinal shaped fluid flow passage therethrough which intersects its axis of rotation. Valve seats are removably seated in the chamber about the inlet and outlet portions of the flow passage and have concave surfaces which seat the ball member and seal about the flow passage therethrough. The opening in the housing is cooperatively dimensioned with respect to the ball member and the valve seats to permit their removal therethrough.

Abstract: A high pressure ball valve is disclosed having dual, independent seat to ball seals, the dual seal arrangement including a primary seal and a secondary seal, each operating independently, in proper sequence, each acting in the same direction, and each being pressure actuated, with provision for relieving excess fluid pressure.

Abstract: A rotary valve has a valve housing with a wall defining a flow passageway, a closure member journalled within the valve housing and mounted for movement between a first position for permitting flow of fluid within the flow passageway and a second position for ceasing flow of fluid within the flow passageway, and a flexible seating ring disposed at least partially within the flow passageway in a position for sealing engagement with the closure member in second position. The flexible seating ring has a flow-through section sized to fit within the flow passageway with a clearance fit, and a flanged seating section extending outwardly from the flow-through section and positioned for sealing contact with the closure member to seal the valve. A seating ring support member is positioned to support the seating ring in a manner to permit the seating ring to move axially and radially within the flow passageway to provide improved tolerance to dimensional variation in manufacture.

Abstract: A gate valve [10] is disclosed having a primary [300, 302] and secondary [316] seal on the upstream and downstream sides of the gate [15], wherein the gate [15] forms a seal with the seat [300] which is activated mechanically [320] and is fluid powered, and wherein a resilient seal [316a] is moved toward the gate [15] by mechanical actuation [31 ] to form a fluid powered secondary fluid-tight seal with the gate [15].

Abstract: Valve, in particular large ball valve for use in oil and gas installations, of the kind comprising a valve member (2) having a through flow passage (6), a movable seat or seal holder (8, 9) and means (11, 12) for moving the holder in directions towards and from cooperating parts (21, 22) of the valve member. At least one opening from the flow passage (6) is surrounded by a protruding edge portion (20) provided with an annular sealing surface (21). A front portion (17) of the seat or seal holder (8, 9) also has an annular sealing surface (18) adapted to cooperate with the sealing surface (21) on the valve member (21) in the open position thereof (FIG. 1B). Outwardly of its sealing surface (18) the front portion (17) has a seal member (19) adapted to cooperate with a second sealing surface (22) on the valve member (2) in the closed position thereof (FIG. 1A).

Abstract: A high pressure ball valve is disclosed having dual, independent seat to ball seals, the dual seal arrangement including a primary seal and a secondary seal, each operating independently, in proper sequence, each acting in the same direction, and each being pressure actuated, with provision for relieving excess fluid pressure.

Abstract: A gate valve [10] is disclosed having a secondary seal, wherein the gate [15] forms a metal to metal seal with the seat [29, 134] and wherein a resilient seal [36a] is moved toward the gate [15] in a closed position to form a secondary fluid-tight seal with the gate [15]. A device [31, 34] for deenergizing the secondary seal is provided in order to prevent wear of the secondary seal upon opening of the gate and also to reduce the gate [15] drag caused by the energized secondary seal. Also disclosed is a pressure relief mechanism [40, 141] for the secondary seal adapted to prevent damage to the seal and a mechanism for evenly applying opposing secondary seals.

Abstract: A reciprocating positive displacement compressor is described having an intake or exhaust valve provided with a deformable seal means, such as a Belleville spring, that makes edge or area contact with a valve seat in the closed condition of the valve, is described.

Abstract: A surface valve with pressure energized seals and having gear actuation. The valve comprises a body with a rotating valve plate therein. The pressure energized seals provide sealing engagement between the valve plate and body. An actuation gear with a geared surface having a cam-shaped pitch line is positioned adjacent to the valve plate. An eccentrically rotated pinion gear is engaged with the actuation gear for providing rotation of the actuation gear and corresponding movement of the valve plate between open and closed positions thereof.

Abstract: A multiport selector valve incorporates a polished interface between a respective poppet of each port and a displaceable valve spool. A controlled gap exists between each poppet and its respective port fitting to pressurize a recess in which an O-ring is seated during operation of the valve. This results in the O-ring seal being urged against a confronting surface of the poppet which increases the contact force between optical surfaces of the poppet and the spool, particularly during periods of dynamic flow. The construction of the valve results in a unit of high reliability and useful life with attendant reduction of replacement costs.

Abstract: Apparatus for providing a dust free environment in the filling and discharge of bins and other containers is disclosed. The apparatus includes a dual seal which seals directly against a gate assembly. The invention also provides for the introduction of air between inner and outer seals to prevent contaminants from reaching the product. Dust covers are employed on the fill station and discharge station and also on the fill and discharge ends of the bin.

Abstract: A top entry, trunnion-type ball valve has identical, but oppositely arranged sealing assemblies on both sides of the ball. These sealing assemblies include a seal carriage that holds and maintains in position an annular body seal, an annular ball seal and a resilient O-ring interposed therebetween. The O-ring is located in a cavity between the body seal and ball seal which is open to fluid in the valve through-passage and therefore subject to high pressure in the line. Pressure in the O-ring cavity forces the ball and body seals apart and causes the O-ring to compress and resiliently urge the ball and body seals into sealing engagement with the ball and body, respectively. Angled surfaces formed on the seals enhance sealing by concentrating contact pressures.

Abstract: An improved gate valve is provided having improved operating characteristics. Bore pressure in the body cavity of the valve in the open or closed position is isolated. In the closed position a double metal sealing barrier is provided across the gate and in the open position the pressure is isolated from the stem packing and bonnet gasket by the seats on either side of the gate. Formation of hydrates in the body cavity is eliminated and better retention of the body grease is achieved during flow through the valves. Metal-to-metal seal surfaces are developed thereby eliminating wear on the non-metal components and reducing torque requirements.

Abstract: A cartridge intended to be inserted into a body chamber of a mixer valve, which comprises a cage, a fixed plate of hard material, a movable plate of hard material operatively displaceable in the cage and contacting the fixed plate, the plates having mutually cooperating conformations for controlling the flow rate delivered by the valve and the mixing ratio between hot and cold water, and an operator for effecting the displacement of the movable plate in order to execute these controls. The cartridge cage comprises an operatively fixed bottom which is provided at the outside with seals intended to operate between the cartridge fixed bottom and the bottom of the valve body chamber as a consequence of the tightening of the cartridge, and is provided at the inside with couplings complementary to couplings operatively solid with the fixed plate of the cartridge.

Abstract: A shut-off and regulating valve including a housing in which a valve disk is journaled for rotation, especially with double eccentricity. A metal seat ring is associated with a sealing surface of the valve disk. The seat ring includes an integral seat holding portion and has a radially deformable, resilient sealing lip. This sealing lip is permanently deformed radially outwardly by initial closure of the valve disk and contacts the sealing surface of the valve disk in a resiliently elastic manner. The valve has a simplified structure which exhibits improved sealing tightness and reduces the torque necessary to operate the valve.

Abstract: A device for transport of material between chambers at different pressures, comprises a feed chamber, a main chamber having an upper housing with an inlet and a lower housing with an outlet. The feed chamber is coupled to the main chamber at the inlet, and a first slide valve opens and closes the inlet. A second slide valve for opening land closing the outlet may be provided. At least one hollow gasket with an essentially closed wall, preferably an inflatable gasket, is provided between the upper housing and the first slide valve for sealing the inlet; and, at least one gasket with an essentially closed wall, preferably an inflatable gasket, may be provided between the lower housing and the second slide valve for sealing the outlet. Alternatively, a first flap valve for opening and closing the inlet is provided which is pivotally coupled to the upper housing at one side.

Abstract: A valve, with a ball having a shaft (5), comprises, at least on the "upstream" side, a seat (14) that can move in the direction in which the fluid flows (F). Seat (14) is connected to body (1) of the valve by an annular membrane (21), constituting a wall of an annular chamber (22) relatively isolated from the "upstream" conditions for example, by a calibrated hole (23). Equilibration means (26) are provided, with a channel (28) and a conduit (29) connecting annular chamber (22) to central volume (27) of the valve, a communication being formed when the valve is opened, thus moving seat (14) away from ball (5). Said communication can be caused to form by control rod (10) of ball (5) when the valve is adjusted for opening.

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.

Abstract: A valve comprises a valve member engageable with a valve seat provided in a valve body, an annular seal slidably supported on the valve member or adjacent the valve seat and having an axial end face which is sealing engageable with the valve seat or valve member respectively on engagement of the valve member with the valve seat, the axial end face providing at least some of the sealing between the valve member and valve seat. In use the differential in pressure existing between the upstream side of the valve member, and thus closed space, and the downstream side of the valve member when the valve is closed produces an axial force on the seal to drive it axially into sealing engagement with the valve seat or valve member respectively. Any wear of the axial end face of the seal is accommodated by such axial movement.

Abstract: The device comprises a housing with a circular passage orifice, a pivoting closing element in the form of a spherical dome and a circular gasket surrounding the said orifice and mounted on an annular support axially displacable towards the closing element under the action of a pneumatic fluid, the said annular support possessing for this purpose a passive annular surface exposed to the pressure in the said housing, the active surface of the support being larger than its passive surface.

Abstract: A spray valve is disclosed for controlling and directing the flow of a fluid. The spray valve includes an integral trigger/waterway, that is movable between an open and a closed position, and a non-movable fluid seal that plugs the end of the waterway to prevent the flow of fluid. A spring normally biases the trigger to the closed position. The force needed to activate the trigger is substantially independent of the water pressure flow and is defined almost exclusively by the force needed to compress the spring. The spray valve assembly is held together by an integral snap-fit construction, eliminating the need for fasteners such as screws, pins, or the like. The spray valve includes a spray cap that provides a variety of spray patterns. At least one of the bores in the spray cap which is used to produce a coarse spray is also used to produce a mist, so that a conventional bore having a relatively small diameter for producing a mist is not required and the likelihood of clogging is reduced.

Abstract: Gate valve having a primary seal, actuated by fluid pressure in the flow conduit, for preventing leakage along the gate member on the upstream side of the gate valve and a secondary seal actuated by fluid pressure upon leaking of the primary seal and including a self-actuating relief means to prevent build-up of fluid pressure in the valve body in excess of the pressure in the flow conduit.

Abstract: A kelly valve includes a ball valve structure (10) having a ball valve member (40) with a central bore (42) therethrough mounted within a valve chamber (38) for rotation between open and closed positions. A fluid pressure equalizing opening or port (60) is provided in the quadrant of the ball valve member (40) exposed to the upstream flow passage (20) in closed position (FIG. 2) and exposed to the valve chamber (38) in open position (FIG. 1) thereby making the ball valve member (40) easy to rotate manually even at high downstream fluid pressures.