Abstract: A fire safe disc valve comprising a valve body having a flow passageway therethrough, a disc shaft rotatably mounted in the flow passageway and a disc mounted on the disc shaft, the disc being rotatable to and from a position normally closing the flow passageway by sealingly engaging a disc sealing member. An operating stem, extending through a stem operating aperture in the valve body, engages the disc shaft for rotation thereof, and an elastomeric packer seals the aperture about the operating stem. The disc shaft is displaceable along the flow passageway whereby the disc will close the passageway if the disc sealing member is destroyed, and the operating stem is axially displaceable in the stem operating aperture whereby the aperture is sealed by fluid pressure pressing the operating stem against a stem sealing seat if the stem packer is destroyed.

Abstract: A ball valve is disclosed wherein seal assemblies, extending about flow passages in the body of the valve to either side of a valve chamber containing the ball, are constructed to vent excess pressure in portions of the valve chamber cut off from the flow passages by the sealing of the seal assemblies to the ball and to the valve body without the need for backing the seal assemblies away from the ball. For this purpose, the seal between the valve body and each seal assembly is formed by an elastomeric biasing ring which is bonded on one side to the valve body or to other portions of the seal assembly and has an opposite, free side engaging the other of the valve body or other portions of the seal assembly. The biasing ring is positioned on a side of the seal assembly opposite the ball and fluid pressure in the cut off portion of the valve chamber is transmitted about the seal assembly to the free side of the biasing ring for venting thereacross into a flow passage.

Abstract: A tilting disc check valve wherein a valve module containing the tilting disc is positioned adjacent the inlet of the valve into a valve chamber by a cradle formed by a portion of the interior surface of the wall of the valve chamber and an arcuate ridge formed on such interior surface and spaced a distance from the inlet. A threaded port is formed through the wall of the valve chamber opposite the ridge and a bung, screwed into the port, closes the port and bears against the valve module to seat the module in the cradle provided for the module.

Abstract: A fire safe disc valve comprising a valve body having a flow passageway therethrough, a disc shaft rotatably mounted in the flow passageway and a disc mounted on the disc shaft, the disc being rotatable to and from a position normally closing the flow passageway by sealingly engaging a disc sealing member. An operating stem, extending through a stem operating aperture in the valve body, engages the disc shaft for rotation thereof, and an elastomeric packer seals the aperture about the operating stem. The disc shaft is displaceable along the flow passageway whereby the disc will close the passageway if the disc sealing member is destroyed, and the operating stem is axially displaceable in the stem operating aperture whereby the aperture is sealed by fluid pressure pressing the operating stem against a stem sealing seat if the stem packer is destroyed.

Abstract: A pressure actuated seat ring for a disc valve has a tubular, relatively flexible portion extending axially from a radially thicker, relatively inflexible portion. The flexible portion of the seat ring extends circumferentially about the disc of the valve when the valve is closed and a cavity is formed about the flexible portion such that fluid pressure in the cavity tends to force the flexible portion of the seat ring against the disc. The ends of the cavity are vented to the flow passage of the valve at opposite sides of the disc and an elastomeric sealing ring mounted on the tubular portion of the seat ring is movable within the cavity in response to a pressure differential at the vents to seal the vent exposed to the lower pressure so that the larger pressure is transmitted to the cavity.

Abstract: A tilting disc check valve is provided with a valve assembly comprising a clapper assembly and an annular seal member. The seal member abuts an annular face extending about an inlet passage of the valve and the opposing face of the seal member is abutted by a clapper support member, forming a portion of the clapper assembly, having the form of an interrupted ring. A clapper is pivotally mounted on the clapper support member via a tab extending into the interruption formed therein. A hole formed in the clapper support member and intersecting the interruption thereof and an aperture formed through the tab permit the tab to be connected to the clapper support member via the insertion of a pin into the hole and the aperture.

Abstract: A cam actuable valve wherein annular seats and a valve closure member are axially insertable into a flow passage bore of a valve body. The valve closure member is supported within the flow passage bore by cylindrical trunnions which are partially inserted into the flow passage bore from the exterior of the valve via laterally extending trunnion bores which intersect the flow passage bore and the exterior of the valve body. Cams are formed on the trunnions by forming recesses along chords of the trunnions, the recesses receiving portions of the annular seats when the valve is closed to permit the seats to engage the valve closure member.

Abstract: A disc valve includes a seat ring having a butt portion anchored to the body of the valve and a seal portion which extends axially from the butt portion. The disc of the valve is axially aligned with the seal portion of the seat ring so that the valve is sealed via engagement of the seal portion with the periphery of the disc. An annular cavity is formed about the seal portion of the seat ring and opposite ends of the cavity are vented to the valve chamber on opposite sides of the disc. An elastomeric seal disposed in the cavity is responsive to pressures of opposite ends of the cavity to close the vent to the low pressure side of the disc such that the higher of the fluid pressures on opposite sides of the disc is exerted on the outer periphery of the seal portion of the seat ring to foce the seal portion against the disc when the valve is closed.