Abstract: A fluid pressure actuator having two connected pistons movable in a cylinder, and having a gear rack associated therewith to engage a pinion attached to the shaft to be rotated. Adjustable travel stops are located on each end of the cylinder to control the position of the actuator at the end of the stroke. Each stop has a pair of stop plates which have ramps on the mating faces such that rotation of one stop plate relative to the other adjusts the thickness of the pair, thereby adjusting the position of the end stop for the piston.

Abstract: A ball valve with a port (30) through the ball (26) has a groove associated with each end of the port with each groove (32,34) extending partially around the circumference of the ball. Each groove connects with its end of the port (30) and extends away from the port in the plane of rotation of the ball. The grooves decrease in size as they extend away from the port whereby the grooves serve to control the flow area depending on the degree of rotation of the ball. Diffusers (22,24) in the inlet and outlet of the valve assure that any cavitation will occur within the diffusers which are formed of material adapted to withstand the cavitation forces.

Abstract: A butterfly valve wherein at least one cam is mounted on the valve shaft and located in a cam chamber associated with the valve disc. The cam cooperates with the cam chamber to rotate the valve disc between an open position and a closed position in alignment with and spaced from the valve seat at which point further rotation of the disc is prevented by stop means. The cam then further cooperates with the cam chamber to force the valve disc linearly into a seated position in engagement with the valve seat. Belleville springs engage the cam and force the valve disc away from engagement with the valve seat. A normal 90.degree. valve actuator may be used.

Abstract: A wafer style butterfly valve has a valve body including a through opening with a cylindrical wall coaxially surrounding an end portion of the fluid passage. The insert is retained within the valve body by at least one wire form held in an annular channel defined by facing annular grooves in the valve body wall and the insert peripheral wall. The wire form includes a member projecting therefrom for engaging a surface of the annular groove in the valve body wall or the annular groove in the insert peripheral wall. A tapered wall at one end of the insert provides for expansion of the wire form during insertion of the insert into the valve body.

Abstract: An annular valve seat is fitted in a rotary fluid control valve of the butterfly type. The seat consists of a radially outer tail portion, a radilly intermediate metal support portion in the shape of an S and a radially inner metal seal portion having a metal sealing surface in the form of an annular semi-torus. The seal portion includes structure for retaining an elastomeric sealing insert. The valve seat is inserted in a groove between the valve body and an insert, with a small space existing between the axial sides of the groove and the axial sides of the S-shaped intermediate portion. The intermediate portion accordingly permits limited flexure in response to pressure stresses on the valve seat, but the flexure is limited by contact with the walls of the groove. The metal and elastomeric sealing surfaces provide leak-free sealing with an extending life.

Abstract: A wafer style butterfly valve has a valve body including a through opening with a cylindrical wall coaxially surrounding an end portion of the fluid passage. The insert is retained within the valve body by one or more resilient wire forms held in an annular channel defined by facing annular grooves in the valve body wall and the insert peripheral wall. The wire forms have circular sections while the insert groove has a semi-circular section, thereby providing a self-centering and self-locking effect. A tapered wall at one end of the insert provides expansion for the wire form during insertion of the insert into the valve body.

Abstract: A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top surface of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90.degree. causing the seat to be pushed back by the larger diameter of the pin.

Abstract: A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top entry of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90.degree. causing the seat to be pushed back by the larger diameter of the pin.

Abstract: Disclosed is a ball valve with seats having means to relieve harmful build-up of cavity pressure. The heel of the valve seat has grooves therein allowing cavity pressure to be applied over a portion of the seat surface in a fashion that produces a resultant force in a lip region of the seat. This resultant force causes the lip region of the seat temporarily to move away from the ball and thus vent the cavity pressure to a lower pressure zone.

Abstract: A pneumatic actuator having a cap-shaped diaphragm cam rigidly attached to a resilient diaphragm retained in an actuator housing. The diaphragm cam is provided with opposed drive slots cut through the wall thereof, and with at least one correction slot cut through the wall at a bottom edge thereof. A drive pin coupled to a drive shaft is rotatably mounted with the drive slot such that a vertical movement of the diaphragm cam produces a rotational movement of the drive pin and the drive shaft. A correction cam having a shape corresponding to that of the correction slot is formed in the actuator housing beneath the correction slot and is firmly seated within the correction slot upon descent of the diaphragm cam to correct any rotational movement of the diaphragm cam.

Abstract: Disclosed is a fire-tested butterfly valve having a resilient flexible seat member held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. Also positioned between the housing and the insert is a fusible washer means which has a lower destruction temperature than that of the annular flexible seat. Further, the insert is spring biased toward the fusible washer and valve housing so that when the valve is exposed to fire the fusible washer melts, the insert is biased toward the housing, and as the annular flexible seat is destroyed by heat, an edge of the insert into contact with the butterfly disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: Disclosed is a fire-tested butterfly valve having an annular resilient seat member and an annular, flexible metal seat member, both held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. In a first embodiment, a fusible washer with a lower destruction temperature than that of the annular resilient seat is positioned between the resilient seat and the metal seat. In a second embodiment, an integrally formed protrusion on the annular resilient seat contacts the metal seat. In both embodiments, the metal seat is held out of contact with the butterfly disc until exposure to a fire melts the fusible washer or the seat protrusion, at which time the metal seat comes into contact with the disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: Disclosed is a tank bottom internal valve housing. A low profile valve housing with a valve such as a butterfly valve and a means for opening and closing the valve is assembled to a saddle on the tank bottom by a number of bolts located around the periphery of the valve housing and engaging in threaded blind holes in the tank saddle. A discharge nozzle is mounted on the lower face of the valve housing in such a way that the discharge nozzle mounting can be sheared away from the rest of the assembly during, for instance, an accident without affecting the integrity of the valve housing itself.

Abstract: Disclosed is a lock for a valve having a stem which by rotation controls the opening and closing of the valve. The lock essentially comprises a housing having a first opening therein to receive the stem and a second opening; a locking member is disposed in the second opening and comprises a terminal portion which in its closed position contacts the stem and prevents the stem from rotating, a middle portion connected to the terminal portion and having a periphery substantially equal to the greatest periphery of the second opening, and an end portion connected to the middle portion and having a periphery less than the greatest periphery of the second opening.