Abstract: A wafer type butterfly valve having a spherical segment body interior contoured to receive a disc seal having upstream and downstream seals. The seals are configured to fit disc grooves and are curved to fit the body contour. Mechanical retainers are provided and there is provision for adjustably applying pressure to the seals.

Abstract: A combination valve assembly is provided for controlling fluid flow through a housing within which a ball element is operatively positioned and has a throttle valve element operatively mounted within its bore. The ball element has a latching slot to receive a latching spline carried on the inner end of an outer sleeve-like stem that extends through the side wall of the housing. The throttle valve is operated by a stem extending inwardly along the outer sleeve stem which operates the ball element. The throttle valve element may be set for any desired size of fluid control opening, and may have either a bubble or a sealed closing-off fit within the bore of the ball element.

Abstract: A butterfly valve construction for use particularly on pipelines through which fluid under pressure is adapted to flow and to be selectively cut off. The butterfly valve disc is rotatably supported within the valve casing. Within the valve casing at a region whereat the valve disc is adapted to be turned for closing an elastomeric ring is supported and a plurality of clamp ring segments are supported about the casing periphery to abut one face of the elastomeric ring. Each clamp segment is adjustable to a fixed selective position by positively acting means to compress the elastomeric ring against an internal surface of the disc, thereby also extending the ring in a direction toward the valve disc edge when the latter is in a closed position. This extension is adequate to force the elastomeric ring to fit tightly to the valve ring at valve closing times and directly form a tight seal thereto.

Abstract: A method of mounting valve seats in a butterfly valve comprising a valve body mounted in a valve stem in a valve housing. The valve seats are attached to the valve housing so as to contact the periphery of the valve body when the valve is closed. End surfaces of the valve seats are adjusted relative to the valve stem and seal members by means of first bolts. Then, the first bolts are replaced with third bolts for pressing the valve seats against the periphery of the valve body.

Abstract: A valve seat insert is disclosed which is useful in a butterfly valve of the type disclosed and claimed in U.S. Pat. No. 3,608,861. In such valves, disc and sealing ring contact pressure is enhanced by fluid pressure in the fluid line regardless of the direction of fluid pressure. The valve seat mechanism provides a fulcrum to control deflection of the seat ring when the seat is pressurized from the stem side, and also, by means of an insert with a locking ridge, limits undesirable inward radial movement of the seat ring.

Abstract: A butterfly valve in which a gasket is secured about the vane periphery and in cooperation with an annular body seat effects a seal for closure of the valve passage. Supporting the gasket in a manner to enable controlled enlargement by a locally applied compression force is an annular recess in the vane face inwardly extending from the periphery and a radial clamping ring securing the gasket in the recess. A plurality of screw fasteners extending through the ring and gasket into the vane body operate when tightened to radially enlarge the elastomer for increasing its sealing capability against the seat. Combined surface interference afforded by each of the ring and recess radially constrain the gasket between the ring and vane enabling the energy of compression imposed by screw tightening to remain stored. In this manner the effected enlargement is substantially restricted to within a controlled peripheral portion of the gasket.

Abstract: An improved butterfly valve with self energizing seal, having a body with parallel faces and a substantially circular opening therethrough, and a shaft transverse to said opening. A closure disc is rigidly attached to said shaft and spaced from said shaft a selected distance, with its plane parallel to a plane through the axis of said shaft. A seal ring, comprising a thin cylindrical metal ring with an elastomeric ring bonded to the inside surface thereof, is inserted into the upstream face of said body. The elastomeric ring has an internal seating surface which is a truncated conical surface, tapering upstream, and which is tangent to a spherical surface centered at the intersection of the axes of said opening and said shaft. The edge of the closure disc is in the form of a ridge, having a peak which is circular in crosssection. When the valve is closed, by rotating the shaft, the disc is in the plane of the seating surface and the ridge has a small radial penetration into the elastomeric surface.

Abstract: A combined stop and intercept valve is provided for controlling steam flow from a high-pressure steam turbine to a low-pressure steam turbine and comprises a substantially cylindrical casing having two identical butterfly discs fixed to rotatable shafts and disposed within the casing one immediately downstream of the other. Under normal operating conditions, both the stop (upstream) and intercept (downstream) valves are opened providing a relatively unrestricted passage for the flow of steam. During a turbine overspeed condition when the turbine speed reaches 103% of rated speed, the intercept valve closes substantially all the way. The stop valve backs up the intercept valve. Should the turbine speed reach 108% of rated speed, the stop valve closes completely shutting off the flow of steam to the low-pressure turbine. When opened, the discs partially overlie each other so that any wakes in the steam flow produced by the stop disc will not cause the intercept disc to flutter.

Abstract: A valve body has a closing member rotatably mounted in a passage for opening and closing said passage. An annular groove having a substantially dove-tailed cross sectional portion is formed in said valve body for receiving an elastomeric annular seal ring. Said groove is positioned so that the seal ring is engaged by the periphery of the closing member when said closing member is in the closed position. The annular seal ring includes a pair of annular axially extending arms disposed on each side of said seal ring and an annular spring member embedded in said seal ring and extending into the axially extending arms so that when the seal ring is disposed in the groove the spring member forces said arms into engagement with the dove-tailed portion of the groove thereby rendering the seal ring self-retaining.

Abstract: An adjustable seat for butterfly valves wherein an annular groove is provided in the valve body for receiving an annular sealing member against one sidewall thereof for sealingly engaging the valve closure member in the closed position of the valve. A plurality of circumferentially spaced inwardly directed lugs are provided on the valve body conterminous with the groove and spaced from the sidewall thereof. A plurality of arcuate seal retainer members are disposed in the groove and interposed between the lugs and the sealing member for retaining the sealing member in a sealing position within the groove. Adjustment members are provided on each lug for selective adjustment of the pressure of the arcuate segments against the sealing member for adjusting the sealing pressure of the sealing member.

Abstract: Disclosed herein are valve seals wherein an annular seal member is retained in an annular recess in a valve body wall, the seal member being axially flexible. A resilient annular garter spring is provided between the seal member and a converging surface on a wall of the valve body recess. When a valve employing this seal arrangement is closed, differential pressure urging the seal member in a downstream direction tends to deflect the seal member around the garter spring, while the garter spring tends to coact with the converging surface of the recess to provide a radially inwardly moving fulcrum for forcing the seal member into tighter engagement with a valve closure member.

Abstract: A rotary valve for providing control of fluid flow throughout a wide range of pressures and temperatures. The valve includes a pressure sensitive and temperature responsive annular yieldable seat that cooperates with the valve's flow control element to establish a fluid seal, and a temperature responsive rigid energizer ring for maintaining both a radial and an axial load on the seat at all temperatures. The valve seat includes an annular, radially outwardly extending leg that is held in position against a radial surface of the valve's body by the energizer ring, and at least one pressure sensitive annular sealing lip that extends in a generally axial direction from the leg and in contact with the valve's flow control element when the valve is closed. The energizer ring has a generally wedge-shaped cross-sectional configuration and is held in position in the valve body by a retainer ring that is releasably secured, as by screws, to the valve body for quick and easy servicing of the seat.

Abstract: A positive shut-off seal mechanism for use in pressurized fluid systems subject to high temperatures or fire risk. The seal mechanism includes a metallic valve seat in the form of an annular thin-walled skirt-like lip, preferably formed in a valve seat insert ring or retaining ring, the lip extending generally upstream toward the high pressure side of the valve. The edge of the lip engages a mating circumferential sealing surface of a valve disc, preferably at a location downstream from the plane of maximum disc diameter, with an interference fit to provide a preloaded radial sealing force between the edge of the lip and the sealing surface of the disc. The annular lip preferably forms the downstream side of an undercut groove for a resilient seal ring that provides a primary seal, the engagement of the lip edge with the sealing surface of the valve member providing a metal-to-metal backup seal in the event of damage to or destruction of the resilient seal ring.

Abstract: An improved check valve having a housing or body with parallel faces and a substantially circular opening therethrough, and a shaft transverse to the opening. A flapper disc is rigidly attached to the shaft. A seat means comprising a metal ring is inserted into the upstream face of the body, and has a seating surface which is a truncated conical surface, tapering upstream. The conical surface is tangent to a sphere centered in said body. The disc, when closed, is in the plane of the seating surface. The edge of the plate is in close spacing to the seating surface, and is correspondingly tapered. The edge of the plate has a rectangular groove having a cylindrical base and walls perpendicular to the base. An O-ring is seated in the groove, and provides a self energizing seal. Means are provided to center the disc in the seat. Means are provided to apply a selected torque to the shaft.

Abstract: This device is essentially a butterfly type valve which acts as a flow constriction by rotating a disc body with its planar axis parallel to or at right angles to fluid flow through a channel. The disc body has an additional capability of extending sectors from the body beyond the original boundary or peripheral edge of the body, thereby increasing the restriction of the flow area surrounding the disc.

Abstract: A butterfly gate valve for control of water in treatment, waste water plants and the like, wherein the gate is mounted on a one-piece shaft. The lower end of the shaft rotates in a radial bearing, and a radial bearing and a thrust bearing are provided on the upper end of the shaft above the gate. The upper bearings are housed in a protective bonnet and may be sealed from access of water. The upper bearings are easily accessible through a removable bonnet cover. The vertical position of the leaf within the frame is adjustable by means of a rotatable threaded member reacting against a mating member above the frame.

Abstract: A valve, such as a butterfly valve, having an adjustable valve seat. The valve includes a valve body having an interior passage and a valve member journalled in the body for movement between positions opening and closing the passage. The body further includes an inwardly opening groove for receiving a valve seat formed of a flexible material. Also received within the groove is an arcuate structure, the circumference of which can be selectively adjusted. As the circumference is increased, the arcuate structure bears against the valve seat to compress the same and distort a portion thereof into the passage to provide good sealing contact with the valve member.