Abstract: A locking device for a butterfly type valve is provided with an actuating shaft extending through a bore provided in a conduit in which the valve is located; the inner end of the shaft carries a locking arm that is movable upon rotation of the shaft between a locking and unlocking position relative to the valve.

Abstract: A valve actuator includes two parallel tracks in each of which a slider block is disposed to slide with a pivot pin and nut carried between the slider blocks; a valve stem engaging member is provided with an arm terminating in a sleeve in which a pin having an eccentrically shaped central portion is disposed; from each slider block, an arm extends to connect to an end of the pin in the sleeve; a set screw is employed to fix the position of the pin once the angular position of the arms is set to obtain the optimum mechanical advantage.

Abstract: A method for adjusting sealing engagement of a valve seat includes providing a valve with a disk in a flow passageway and a valve seal with a seat positioned for sealing engagement with the disk, the valve body and seal together defining a channel having a seal surface lubricated to resist adhesion of the surface and polymeric material, the valve body defining a passage for external access to the channel; injecting liquid polymeric material through the passage into the channel, the polymeric material in the channel pressuring the valve seat toward sealing engagement with the disk; allowing the polymeric material to harden; producing a tunnel through the hardened polymeric material from an external port to the lubricated surface of the seal; and injecting liquid polymeric material under pressure through the tunnel into the channel and causing the liquid polymeric material to flow along the lubricated surface of the seal to collect in selected regions to improve sealing engagement of the seat with the disk.

Abstract: A flexible seating apparatus is disclosed for use in rotary valves comprising a flexible seat ring attached to one of the valve body and valve closure member in a cantilevered fashion and maintained thereagainst by a resilient member, the latter being held captive in a pre-formed channel in the flexible seat ring. Slotted fastener holes spaced radially along the flexible seat and corresponding fasteners permit automatic axial ring adjustment and proper positioning of the flexible seat ring upon assembly and initial closure of the valve's closure member. An alternate embodiment is disclosed in which the flexible seat ring is mounted to the other of the valve body and the valve closure member. The present flexible seating apparatus can be used with rotary ball valves and butterfly valves, for example, and further, is advantageously used to permit droptight metal-to-metal valve seating.

Abstract: A new and improved butterfly valve, and particularly, an inexpensive seal therefor. A valve body having a fluid passage is provided with a flexible valve seat about the periphery of the passage, while a butterfly valve disc is journalled within the passage for movement between an open and closed position and includes an annular, radially outwardly extending, peripheral lip. The lip receives a C-shaped hoop which may be stamped, rolled or extruded from a corrosion resistant material for sealingly engaging the valve seat when the disc is in the closed position. Suitable sealing means may be interposed between the hoop and the valve disc. The use of such a hoop permits the construction of a more economical valve than those heretofore known.

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.