Abstract: A tamper-proof locking mechanism for a rotatable control device, such as a quarter turn valve, including a valve member connected to a stem rotatably mounted in a body housing the valve member and an operating handle connected to the stem via an elongated extension for rotating the valve member between open and closed positions. The locking mechanism includes a bracket mounted on the body and having a flange spaced outwardly from the body and generally perpendicularly to the rotational axis of the stem and including an aperture through which the extension extends and a pair of circumferentially spaced projections extending radially outwardly relative to the rotational axis of the stem at locations corresponding to the open and closed positions of the valve member.

Abstract: A rotatable control device or valve including a body housing a control mechanism and a rotatably mounted control shaft connected to the control mechanism. Stops are spaced circumferentially relative to the control shaft. A stop arm is operably connected to the control shaft and engages the stops to limit rotational movement of the control mechanism between first and second positions. An elongated extension is drivingly connected to the stop arm, and an elongated operating handle is connected to the extension with the orientation of the longitudinal axis of the operating handle corresponding in a predetermined relationship to the position of the control member. A registration mechanism permits the extension to be drivingly connected to the stop arm only when the orientation of the longitudinal axis of the operating handle corresponds in the predetermined relationship to the position of the control means.

Abstract: A rotatable control device including a body housing a control structure and having an external box; a control shaft journalled in the boss for rotation about an axis and having an internal portion connected to the control structure and an external portion extending outwardly from the boss; an operating handle having an inner end portion connected to the external portion of the control shaft, a gripping end portion for rotating the control structure between first and second positions and an intermediate portion; first and second locking structure circumferentially spaced on the body at locations corresponding to the positions of the intermediate portion of the handle when the control structure is in the first and second positions, respectively; a slider member slidably mounted on the intermediate portion of the handle for reciprocative movement between locked and unlocked positions; interlocking structure for cooperating with the first and second locking structure, when the handle is in the first and second po

Abstract: A tamper-proof locking mechanism for a rotatable control device, such as a quarter turn valve including a valve member connected to a stem journalled in a body housing the valve member and an operating handle connected to the stem for rotating the valve member between open and closed positions. The locking mechanism includes a pair of lugs on the valve body at circumferentially spaced locations corresponding to the locations of an intermediate portion of the handle when the valve member is in the open and closed positions. A slider member is slidably mounted on the intermediate portion of the handle for reciprocative movement between a locked position and an unlocked position. The slider member includes a latch element having an open portion for receiving the lugs and arranged to restrain both rotational and axial movement of the handle when the handle is in the open or closed position and the slider member is in the locked position.

Abstract: The butterfly valve includes a pair of tailpieces which are threaded onto the outer ends of axially spaced pipe sections of a piping system and have a radially extending flange, a valve unit having a wafer-like body which fits between the tailpieces, and a pair of clamping members, each encircling one of the tailpiece flanges. All of these components preferably are fabricated by a powder-metallurgy process.The valve unit is supported between the tailpieces by a plurality of bolts which extend through axially alignable, circumferentially spaced apertures in the clamping members and the outer periphery of the valve body. After the butterfly valve has been installed, the valve unit can be removed without disturbing the piping system by removing the bolts or rotated 360.degree. without disturbing the piping by loosening the bolts so that the valve unit and clamping members can be rotated relative to the tailpieces.

Abstract: The butterfly valve includes a body having a cylindrical bore, a continuous internal groove in the bore and a resilient O-type, sealing ring mounted in the groove. Rotatably mounted in the bore for shutting off flow is a valve member which preferably is disc-shaped and includes a peripheral seating surface of spherical shape for sealingly engaging the sealing ring when the valve is in a closed position. The valve member also includes a plurality of circumferentially spaced retainers, such as a plurality of axially extending fins located on the opposite sides of the disc and having a curvilinear outer face, which slidably engage normally unrestrained sections of the sealing ring and mechanically retain these sections against dislodgment from the groove during valve operation, particularly by the differential fluid forces existing across the valve member during initial opening and final closing.

Abstract: The valve includes an upper or inner portion housing, a first spring which acts on the top of a valve member and normally urges it into sealing engagement with a seat, and a lower or outlet portion carrying an actuator pin having an inner end which disengageably abuts the underside of the valve member and is actuated to lift the valve member against the biasing force of the first spring. The valve actuator pin has a vent passage extending from its inner end to atmosphere. When the actuator pin is actuated to open the valve, the valve member covers the inlet of the vent passage. When the valve is closed, a smaller second spring, carried on the inner end portion of the valve actuator pin, urges the inner end of the actuator pin away from the valve member, thereby opening the vent passage inlet so that the portion of the valve body below the valve member is vented to atmosphere. This permits the discharge conduit connected to the valve to be gravity drained after the valve is closed.

Abstract: A vent system includes a spring-loaded closed vent valve mounted in the upper portion of the truck tank and a spring-loaded closed safety valve mounted in the bottom of the tank. The safety valve has a discharge portion carrying an actuator pin which disengagably abuts the underside of the safety valve member and is actuated to lift the valve member to permit flow of gasoline from or into the tank. The vent valve member is operatively connected to the safety valve member by an actuating rod so that the vent valve is opened or closed when the safety valve is opened or closed. The safety valve, actuating rod and vent valve are provided with an overboard vent passage which extends from an inlet in the safety valve member to an outlet in the vent valve member. When the actuator pin is actuated to open the safety valve, the inner end of the pin covers the vent passage inlet and vapors are vented from the tank through the vent valve in a normal manner.

Abstract: The butterfly valve includes a body having a generally cylindrical bore defining a flow passage and a generally circular, stem-mounted disc member rotatably mounted within the bore for shutting off flow. The disc member is comprised of two identically arranged halves which are formed from an inexpensive, relatively thin material. The disc halves include central semicylindrical portions defining a hub for receiving the stem and a flange defining a continuous, peripheral groove including diametrically opposed annular portions which encircle the stem. Disposed in the disc groove is a unitary, resilient sealing ring including annular sections which engage flattened portions of the bore to provide stem seals throughout all positions of the disc and semicircular portions which sealingly engage the bore when the disc member is in a closed position.