Abstract: A valve is disclosed in which the wear-prone parts comprised of the valve, guides and valve seat are readily and easily removed through the bonnet area. The guides are maintained in position in the valve body by engagement with a stop and by securing the bonnet to the body without the requirement of being bolted to the body. Other features and details are disclosed.

Abstract: A balanced stem gate valve incorporating a slab gate having hard friction resistant sealing face surfaces that cooperate with friction resistant seat assemblies to provide for low operating torque under high pressure conditions. Seat carrier rings are supported within the valve chamber and define seal recesses within which are retained a metal back-up seal ring and a hard friction resistant face sealing ring that is compatible with the sealing surface material of the gate. Metal-to-metal back sealing is provided between the stem and bonnet and between the pressure balancing stem and the valve body structure, depending upon the position of the reversable gate member.

Abstract: A valve has a metal-to-metal seal system between the flow bores of the valve body housing and each of the valve seat hubs. Each seal system includes an elastic dished metal ring gasket and a retainer ring. Each metal gasket is softer than each of the seat hub and the valve housing, is of rectangular cross-section, and the edge at the inner periphery on the convex side is flattened. Each seal system is disposed on an annular groove cut in the outer periphery surface of the end of the seat hub. One side of the metal ring gasket is located adjacent to the shoulder of the seat hub formed by the groove cut into the outer periphery end of the seat hub. The retainer ring is reciprocably mounted on the seat hub groove adjacent to the other side of the metal ring gasket and extends beyond the end of the seat hub prior to activation of the seal system.

Abstract: A compact, hydraulically operated pressure valve for selective opening and closing of conduits or the like is provided which can withstand extremely high pressures in use, is easily repaired and/or replaced, and is low in cost. The valve includes a thin, circular metallic diaphragm which is mounted for bulging in response to pressure directed thereagainst, along with cavity structure adjacent to and in communication with one face of the diaphragm; in use when the diaphragm is located in closing relationship to a pressurized conduit, hydraulic fluid directed to the chamber establishes a desired pressure differential across the diaphragm such that the latter experiences only a desired pressure. The bulging of the diaphragm also causes the latter to sealingly engage a sharp marginal sealing edge associated with the valve, to further enhance the integrity of the closure effected thereby.

Abstract: An expanding gate valve having seats (74) which are mechanically secured in place. The valve body has seat pockets which include undercut grooves (78) intersected by a cylindrical body cavity (24) to form a pair of openings (80) to each groove. Each valve seat has a pair of lugs (90) which may be fitted through the openings and into the undercut groove. Subsequent rotation of the seat locks the lugs in the groove to secure the seat in place in its seat pocket. Each seat is able to pivot about an axis extending between the lugs in order to compensate for irregularities in the contact surfaces of the gate or seat.

Abstract: A packingless gate valve comprises a housing having two opposed resilient sleeve units that compressibly engage end to end in valve open condition and engage opposite sides of the gate in valve closed condition. Each sleeve unit is a resilient annular body formed at one end with an axially projecting seal lip near the inner periphery and has a bonded stiffening and gate guide element around the outer periphery at the one end. An integral gasket forming flange is formed on the other end of the sleeve body.

Abstract: In an expanding gate valve, tangential pins (70) are received loosely in peripheral grooves (62) of floating valve seats (26) to prevent the seats from moving inwardly far enough to drag against a gate mechanism (32) which is collapsed for movement between open and closed positions of the valve. Alternative arrangements provide retainer rings (122, 130) which engage shoulders (128) of the seats to limit their inward floating movement.

Abstract: An expanding gate valve having a pair of seat spacers (70) which hold apart a pair of floating valve seats (32) to prevent them from binding against a gate mechanism (40) which is collapsed for movement between open and closed positions. The spacers (70) are cylindrical segments which fit in the valve chamber of a gate valve having a cylindrical body cavity (20).

Abstract: A two-piece retainer ring fits within opposed grooves (80,82) in a gate valve seat (64) and the adjacent valve body (12). The opposed grooves are of a width greater than the width of the two ring segments (84) comprising the two-piece ring and limit the movement of the associated floating seat (64). A wave spring (86) urges the ring segments (84) radially outwardly in the grooves and an access opening (88) to the grooves permits the ring segments (84) to be actuated by a suitable tool for removal of the seat, if desired.

Abstract: A controlled or limited floating seat for an expanding type gate valve. The seat is received in a shrink fit in a groove formed around the flow passage of the valve adjacent the valve chamber. The seat is able to move in the groove toward the valve chamber until a frusto-conical outer side of the seat contacts a frusto-conical outer surface of the groove to prevent the seat from dragging against the gate assembly in the collapsed condition thereof. In the expanded condition of the gate assembly, the seat is bottomed in the groove with a sealing surface of the seat tightly sealing against the gate assembly.

Abstract: A damper assembly for closure of a duct for conveying hot corrosive gases is disclosed.

Abstract: A seating element is positioned in a flow cutoff device. The seating element includes a central opening for conducting fluid flow. The flow cutoff device includes an apertured sealing member which slides across a seating portion of the seating element between open and closed positions. The seating portion includes a rim surrounding the central opening and a transverse surface surrounding the rim. The rim projects axially beyond the junction of the rim and surface. The seating element is mounted under compression so that the transverse surface flexes against the sealing member and functions to scrape away particulate matter when the sealing member is opened and closed, and to prevent twisting of the rim.

Abstract: A slide gate mechanism embodying novel seal means for providing a watertight seal between a sliding gate member and its supporting members.

Abstract: A gate valve structure for use in large diameter mains carrying fluids under high pressure, the gate valve structure being provided with an improved annular resilient seal for engaging a valve seat of the type where the valve seat provides for a face-seal and an edge-seal with intermediate sections making both a face-seal and an edge-seal. The annular resilient seal member is provided with a pair of arcuate bulges oppositely disposed thereon at positions to engage the face-seat surface of the valve seat adjacent the face-seat surface's minimum radial thicknesses to provide an increased contact in this area when the gate member is in the closed position. Additionally, the improved gate valve structure utilizes opposed ribs in the elongated chamber of the casing, the ribs being received in guideways or recesses in the periphery of the gate member so as to guide the gate member during opening and closing. Such an arrangement permits the use of smaller and lighter valve casings for large diameter mains.

Abstract: A knife gate for use in pneumatic conveying equipment is the subject of the present invention. The improved knife gate device is constructed utilizing first and second guide plates disposed in spaced apart relationship with a resilient member positioned behind each of the plates. Each plate is characterized by an opening and a planar surface extending on either side of the opening. A reciprocating gate means is disposed between the plates and places the yieldable means under compression. The gate means has an opening and a planar surface extending on at least one side of the opening. The gate means is moveable between an open position wherein all of the openings are aligned and a closed position wherein the planar surface of the gate means moves past the openings in the guide plates to close the latter.

Abstract: A valve in which a blade having an opening is moved between two oval-shaped seals, each having a pair of spaced circular inner seals, all housed in a valve body. One set of aligned circular seals has a central opening flanked by two opposing and aligned openings through the valve body. When the opening of the blade is positioned in alignment with the opening through the seals and the body, the valve is, of course, opened. When the opening of the blade is repositioned opposite the other set of o-shaped seals, the valve is very tightly closed.

Abstract: A gate valve has annular metal seats mounted in seat pockets around the inlet and outlet passageways at the valve chamber. Each of the seat members has a front face which includes an outer seal surface around the outer perimeter of the seat and a flexible annular metal lip around the inner perimeter of the seat. The lip has an inner seal surface on its free end in spaced concentric relation to the outer seal surface and maintains a fluid-tight seal with the gate while deflecting to compensate for deformations of the valve body that would otherwise affect the seal. The inner peripheral surface of the seat has an annular groove which defines the back surface of the lip which tapers from the base to the free extending end thereof. Each of the seat members has a back face which rests in contact with the bottom outer peripheral portion of the associated seat pocket. The seat member preferably has an annular flexible member extending from its back face which may be welded to the valve body.

Abstract: The disclosed valve has a seating gasket with a cross-sectional profile which includes an anchoring portion disposed in the bottom of the gasket groove in the fluid passageway. A seating portion of the gasket extends up from the anchoring portion and is narrower than the anchoring portion, so that the anchoring portion is exposed in the groove on both sides of the seating portion. A pair of fillets are held in the groove on both sides of the seating portion of the gasket and adjacent the anchoring portion to fix the gasket in the groove and to guide the valve disc between them. The gasket has longitudinal ribs to improve sealing and may be integral with an elongate toroid gasket for sealing against the valve disc in the neck of the valve.

Abstract: A lined gate valve having a seat proportioned such that the ratio of the unit bearing stress to the unit shear stress is substantially 0.68. In one form of the valve, the seat comprises a plastic ring having an embedded metal band. The seat is removable and is held in place by the end pressure of a pipe flange. The seat can be removed by tapping against the seat in an axially outward direction. In another form of the valve, the seat is integral but has the same proportions as above recited.

Abstract: A gate valve structure has a one-piece cage (76) in the form of an open ended sleeve which fits in the valve chamber of the body. The cage includes a pair of openings (82) which are aligned with the inlet and outlet flow passages in the body. Seats (60, 62) are mounted within the openings of the cage and have outwardly extending lugs (66) which are received within slots (88) in flanges (86) about openings (82) in the cage. The flanges (86) limit the inward movement of the seats toward the gate assembly and maintain a predetermined minimum spacing between the seats to minimize binding of the seats against the gate. The seats are easily inserted within the openings of the cage after the cage is fitted within the valve body.

Abstract: A gate valve structure having a pair of opposed spacer carriers (72,74) fitting within the valve chamber in abutting relation to each other and spacing the floating upstream and downstream seats (60, 62) from each other a predetermined minimum distance. Each carrier (72, 74) has an annular base (76) adjacent one of the flow passages and a pair of spacers or guides (78, 80) secured to the base and extending from the base (76) in a direction axially of the flow passage. The spacers (78, 80) on opposed carriers are in abutting relation to each other and form a smooth continuation. An expanding gate assembly (28) fits between the spacers and moves between open and closed positions relative to the flow passages.

Abstract: A gate valve having a gate assembly of the expanding type employing a gate element (34) and segment (36) with adjacent wedge surfaces to expand the gate mechanism in both open and closed positons. Opposed floating seat skirts (68) having integral seat assemblies (52, 54) are positioned on opposite sides of the expanding gate valve and have facing slots (76) therein to receive spacer plates (82) therein which maintain a predetermined spacing between the skirts to minimize any binding of the skirts against the gate assembly and to provide a predetermined minimum clearance between the skirts at all times.

Abstract: A sliding gate valve comprising a housing; a sliding gate; an enclosed void space between the gate side edges and the wall of the housing when the gate is in the closed position; and a purge line for injecting pressurized fluid into the void space; improved by gate side edge sealing means comprising a downstream seat mounted on the interior wall of the housing and an upstream seat assembly comprised of a rigid, elongated channel on the interior wall of the housing, parallel to, and upstream of, the gate when in the valve-closed position, the channel having a back wall and at least one side wall, the back wall being substantially parallel to the gate; a rope positioned lengthwise in the channel; the channel having an elongated metal strip flexibly attached along the first of its two long edges to a side wall of the channel so as to sandwich the rope between the back wall of the channel and the rear surface of the metal strip; the seat assembly being positioned such that when the gate is closed the gate's upstr

Abstract: This invention is a novel valve of the slidable-gate type. The valve is designed especially for long-term use with highly abrasive slurries. The sealing surfaces of the gate are shielded by the valve seats when the valve is fully open or closed, and the gate-to-seat clearance is swept with an inflowing purge gas while the gate is in transit.A preferred form of the valve includes an annular valve body containing an annular seat assembly defining a flow channel. The seat assembly comprises a first seat ring which is slidably and sealably mounted in the body, and a second seat ring which is tightly fitted in the body. These rings cooperatively define an annular gap which, together with passages in the valve body, forms a guideway extending normal to the channel. A plate-type gate is mounted for reciprocation in the guideway between positions where a portion of the plate closes the channel and where a circular aperture in the gate is in register with the channel.

Abstract: A valve seal includes inner and outer concentric seal rings located side by side in a groove with the inner seal ring against the groove inner wall and the outer seal ring against the groove outer wall. Interfitting surfaces are provided on the seal rings to hold them together and prevent longitudinal movement between them. The groove and the seal rings cooperate to hold the seal rings in the groove. One of the seal rings is relatively soft and has good low pressure sealing characteristics while the other seal ring is relatively hard and has good high pressure sealing characteristics.

Abstract: A gate valve structure for use in mains carrying fluids, the gate valve structure being provided with an improved valve seat arrangement. The gate valve includes a casing having an unobstructed through-bore and a substantially rectangular shape or elongated chamber communicating with the through-bore in which a gate or disc member reciprocates between closed and opened positions of the valve. The valve casing is provided with a valve seat surrounding one of the ports in the casing defined at the intersection of the through-bore by the elongated chamber, the valve seat lying generally in a plane which converges at an acute angle to a plane normal to the axis of the through-bore and the seat has an upper planar portion facing the other of the ports except at the bottom portion where it merges smoothly into and forms a portion of the unobstructed through-bore.

Abstract: A gate valve having seal members adapted to allow fluid to flow between the upstream seat and the valve housing when the fluid is flowing or attempting to flow in a forward direction, or between the downstream seat and the valve housing when fluid is flowing or attempting to flow in a backward direction, to allow the pressure exerted by the fluid against the upstream and downstream seats and the gate to be substantially equalized while still preventing fluid from incorrectly flowing through the valve.

Abstract: A fire-safe valve structure has a metal seat with an annular groove therein in which a resilient sealing ring is positioned in face-to-face contact with a valve member movable between open and closed positions. The annular groove has an annular space behind the resilient sealing ring to permit displacement of the sealing ring. A fusible material which melts at a predetermined high temperature is associated with the annular space and holds the sealing ring in contact with the valve member. Upon melting of the fusible material and subsequent metering thrugh a metering opening, the sealing ring is displaced within the annular space and the valve member moves into a tight metal-to-metal contact with the metal seat.

Abstract: An adjustable loss-of-head valve with a mobile perforated plate sliding on a stationary perforated plate, constituted by an annular one-piece body comprising an annular constriction on the upstream side with an annular recess immediately downstream from said constriction and in which a mobile perforated plate moves, a stationary perforated plate being disposed in the downstream part of this recess, the assembly formed by the body and the stationary plate being clamped between two flanges of a pipe on which said loss-of-head valve is placed.

Abstract: The present invention relates to a new and useful adjustable packing assembly for a flat, slide-valve control member which comprises: a rectangular housing which supports a plurality of packing members in abutting contact with the flat control member; a plurality of stationary wedge members having a flat surface for abutment with the packing members and further having a surface including a plurality of interconnected, tapered steps; and at least one movable wedge member which includes a surface of a shape similar to and abutting the stepped surface of the stationary wedges, whereby movement of the movable wedges forces the stationary wedges to compress the packing members against the control member.

Abstract: A metallic seat assembly for a gate valve includes an annular seat pocket around the flow passageways to the valve chamber with a metallic annular seat support member rigidly mounted in the seat pocket and a metallic annular seat member movably mounted inside the seat support member and connected thereto by a resilient and flexible annular metallic member. The resilient annular member is secured continuously around its inner and outer perimeters to the seat support member and the seat member respectively and it functions as a spring to bias the seat member toward the gate and as a seal between the seat member and the supporting member. The resilient and flexible member permits axial movement of the seat member relative to the seat support member and also compensates for thermal expansion and contraction of the seat member and the seat support member relative to each other. The metallic seat member has an integral metallic sealing lip extending from an annular groove around the sealing face of the seat member.

Abstract: A limited float or controlled float seat assembly for a gate valve with a transversely expandable gate assembly has generally L-shaped annular seat retainers fixed in recesses around the valve inlet and outlet flow passageways and generally L-shaped annular seat members mounted in a complementary relation within each of the seat retainers. The seat retainers each have an inturned lip opposite to and spaced from the end of the recess. The inturned lips form limit stops for the seat members. The seat members have an outturned lip which contacts the inturned lip of the seat retainer thereby limiting movement of the seat member when the seat member moves to an extended position. The combined amount of float for both seat members is less than the total expansion of the gate assembly from a collapsed position to an expanded position where it seals with the seat members so that drag of the seat members on the gate assembly is minimized.

Abstract: A non-floating seat structure for an expanding gate valve in which a seat ring is pressed within a body recess and a sealing member is inserted in a groove between a rear face of the seat ring and an opposed wall defining the recess to form a fluid-tight barrier. The groove for the sealing member is of a generally rectangular cross-section and is formed by a counterbore in the valve body and a rearwardly extending inner lip on the seat ring which abuts the recess wall when the seat ring is pressed within the body recess.

Abstract: A replaceable one piece bore and chest liner is enclosed within a pair of mirror image castings to define a gate valve. A cast gate, enveloped within molded material, cooperates with the liner to open and close the gate valve.

Abstract: A gate valve structure having a hollow body with inlet and outlet conduits mounted thereon and opposed seat support members mounted on inner ends of the conduits. The opposed seat support members have seat pockets which are finish machined before insertion into the hollow body. The opposed seat support members are in a predetermined spaced relation to each other and they are welded in such spaced relation to the hollow body from a position within the hollow body. One arrangement includes inlet and outlet conduit sections welded to the hollow body and opposed inner conduit sections having the opposed seat support members thereon with the inner conduit sections welded to the inlet and outlet conduit sections from a position inside the conduits to form a continuation of the outer conduit sections. Another arrangement includes inlet and outlet conduits having seat support members welded and finish machined prior to assembly.

Abstract: An apparatus and method for sealing a flow control apparatus, such as a damper, suitable for controlling the flow of fluids in a conduit, especially high temperature gases in flue ducts. The damper includes a closure member which may be removed entirely from the fluid stream by sliding movement through an aperture. Fixedly mounted, cooperating, flat, resilient strips seal the aperture in both the open and closed positions of the damper. Resilient support strips on both sides of the sealing strips control the resistance to flexure of the sealing strips. To prevent damage to the sealing strips as the closure member is withdrawn from the closed position, the sealing strips are allowed to buckle by moving from a condition of concave bending with respect to the interior of the fluid passageway to a condition of convex bending with respect thereto.

Abstract: A gate assembly has a frame with a sill and an opening for the passage of a fluid, and a gate slide mounted on said frame for movement toward and away from said sill, between open and closed positions. The improvement, in combination therewith, comprises a first flange projecting from the frame on both sides of the opening, a resilient sealing member fixed to the first flange, and a second flange substantially identical to the first flange projecting from the back side of the gate slide. The first and second flanges are so positioned that, when the gate slide is in the closed position against the sill, the first and second flanges overlap and the resilient sealing member is compressed so as to produce a water tight seal.

Abstract: A gate valve for high and low pressure service conditions. Flanges extend from side edges of the gate member, the width of the gate member through the flanges being substantially identical to the diameter of the cylindrical valve chamber in the valve body. A relief is provided on either side of the valve chamber and so positioned that the flanges are received therein when the gate member is in the closed position, whereby the gate member is not guided in the closed position to eliminate any possible binding thereof. A cylindrical recess is formed in the wall of the valve chamber encircling each inlet and outlet opening, the recesses being concentric, and a valve seat is received in each recess.

Abstract: A gate valve structure is shown embodying an elongate slide member movable within an elongate housing. The slide member carries a pair of annular seals spaced apart along the length of a valve body and has a bore therein extending through the valve body at a location between the seals. By linear movement of the slide member the bore and seals are each selectively registerable with aligned openings through the housing. This valve structure has operating and maintenance characteristics, which are particularly advantageous for use in the charging and/or discharging of fixed bed coal gasifiers.

Abstract: A pair of seat ring members are loosely mounted in annular recesses around the longitudinal bore in a gate valve body at the intersection of the bore and the valve chamber on opposite sides of the gate member. Each of the seat ring members has a rear face comprised of a pair of stepped portions connected by an outwardly facing annular surface portion. Each seat ring has a groove at the juncture of the outer stepped surface portion and the outwardly facing annular surface. A seal ring chamber is formed between the recess annular wall, the stepped outer surface portion, the outwardly facing annular surface and the groove. A resilient O-ring is positioned in the seal ring chamber. The O-ring has a sufficient cross section to seal between the recessed end wall and the outwardly facing annular surface when initially positioned in the seal ring chamber upon assembly of the valve.

Abstract: A gate valve structure having a valve body with a body recess therein surrounding the valve bore and an annular floating seat member or ring in the body recess for contacting a gate member. The seat ring has an annular groove around a mid-portion of its outer periphery with a resilient sealing member mounted therein. The body recess is defined by a pair of radially stepped wall portions having different diameters and joined by an abutment. The seat ring has a pair of complementary stepped outer peripheral portions facing the wall portions with the groove being positioned between the stepped portions of the seat ring. The seat ring is positioned in the recess and the annular resilient sealing member between opposed sides of the groove is compressed between the abutment on the valve body and an opposed side of the groove in the seat ring to provide sealing between the seat ring and the body and to resiliently urge the seat ring toward the gate member.

Abstract: A fluid control valve of the short gate type having means for maintaining a minimum spacing between the seat rings when the gate is moved to open position. The means makes use of two spreader members that can be readily installed as the valve is assembled.

Abstract: A generally cylindrical seat for a gate valve is pressed in a recess in the valve body with a tight fit. A deformable seal fits within an opposed pair of grooves on the back face of the seat and the gate valve body and the seal is deformed when the seat is pressed in the recess. The seat has a relatively small annular channel spaced in outer concentric relation to the seal groove to provide a lubricant pocket to receive lubricant forced along the adjacent contacting surfaces defining the recess when the seat is pressed in and permit metal-to-metal abutting contact between the seat and valve body.

Abstract: A gate valve having a replaceable one piece bore and chest liner enclosed within a pair of mirror image castings is disclosed. The gate is cast and enveloped within molded material to cooperate with the liner in a sealing relationship.

Abstract: A valve seat - to - body connection, and an installation therefor. A resilient metallic ring having an inside diameter slightly smaller than the outside diameter of a valve body in which the seat member is to be installed, is placed around the section of the seat member. When the seat member is then inserted in the body, it provides initial sealing pressures, but is still readily detachable. Apparatus is provided for injecting a material of plastic consistency or the like into the area surrounding the metallic ring, which deforms the ring into fluid tight engagement with the seat member and the body. Additional seals may also be provided associated with the seat member.

Abstract: A gate valve body having annular tapered seat rings retained in counterbores at inlet ends of an axial flow passage with the seating surfaces of the seat rings engageable by a tapered gate which is vertically guided by outwardly extending tongues on the gate slidably retained in grooves between laterally spaced pairs of guide rails on the body, the seat rings having a minor height less than width of the groove between the pairs of guide rails and an outer diameter greater than the lateral spacing between the guide rails, the seat rings being inserted into the associated counterbore by initially rotating the seat rings 90.degree.

Abstract: A valve comprised of a valve body having a body with flow passages therethrough and a valve member mounted therein movable between open and closed positions. An annular groove in the body around a flow passageway has an open end, a closed end, and a pair of divergent side walls with the groove width at the closed end portion being greater than the width of the open end. An annular seal is positioned in the groove. A chemical fastener in the groove secures the seal ring in the groove. A method of making the valve seal structure includes forming the groove with divergent side walls in a seal ring supporting position of a valve body and then partially filling the groove with a chemical fastener material. The seal ring is inserted into the groove within the chemical fastener material and the chemical material is cured to secure the seal ring in the groove.

Abstract: A gate valve having a valve body particularly designed and constructed of a "slim" design, or of a minimum overall length whereby the valve may be interposed in a flow line in a minimum of space.

Abstract: A valve comprising a housing with an inlet and outlet and a chamber in between, a reciprocating gate mounted in a gate seat disposed within the chamber for opening and closing the valve, an upper bonnet for closing the chamber at one end and a lower bonnet for closing the chamber at the other end, the gate being disposed between upper and lower stems which extend into the upper and lower bonnets respectively. Metal-to-metal seals are provided at all junctures between the above members in the lower gate position with back-up seals at the junctures of all moving members.A double edged seal ring integral with the upper stem self-contained within the upper bonnet provides a metal-to-metal seal with the upper bonnet in the upper and lower gate positions of the valve.A metal gasket arrangement is provided between the upper bonnet and valve body whereby the assemblage of all points of contact between the gasket and body form an annular ring.

Abstract: A selectively biased seal for a gate, which gate is translatable within a one piece liner of a gate valve, is disclosed. Lever means for operating the gate and oriented with or normal to the direction of flow through the gate valve are also described.