Abstract: Fluid flow control valves such as plug valves or cocks have the plugs thereof supported and sealed in the valve housing by a rigid but somewhat elastic plastics bearing member which is preloaded and compressed from its free state condition and seeks to reclaim this condition for taking up wear and preventing leakage in the valve assembly. The bearing member is preferably stretched over the plug and compressed in the housing by a retainer which is pressed into one end of the housing.

Abstract: A ball valve with an actuator wherein a seal assembly with a combination O-ring swivel and seal for producing a tight seal is hidden in a pocket isolated from the flow of fluid through the valve by an inlet reentrant flange and the valve body. The swivel and other parts of the seal assembly including but not limited to the seal thereof, because the O-ring swivel makes the seal assembly mount tenuous and subject to chattering and vibration, can be damaged. This is true because the seal assembly seal receives large and rapid impact loads. The chattering and vibration also thereby produce serious damage to and wear on the seal assembly seal. A great deal of chattering and vibration is usually caused by exposing the seal assembly to the fluid passing through the valve. In the ball valve disclosed herein this is prevented by mounting the seal assembly in the isolated pocket. The valve disclosed herein also has other features.

Abstract: A distribution member for mixing cocks, having the form of a lamellar skirt of an elastically yielding material cooperating with fluid passage ports, and having a backing of a compressed resilient material which exerts an elastical backing action substantially onto the whole surface of the operatively active portion of the skirt.

Abstract: A small ball valve for chemically active materials is provided which does not require the strength of metal parts and which permits the use of brittle material such as glass or ceramic as well as materials such as fluorocarbon polymers and polytetrafluoroethylene which are resistant to the action of chemically active fluids. A free-floating construction is provided without requiring a stem packing gland and permitting the stem to be integral with the ball. Identical sealing rings are provided with clamping screws which press the sealing rings inward against the ball and outward against the openings in the valve body, the diameter of the valve stem being smaller than the opening in the sealing ring and clamping screw therefor so that the portion of the ball surrounding the valve stem may also float freely under the sealing means with the seal around the ball stem being against the ball itself instead of against the valve stem.

Abstract: A ball valve having a seating ring held in a recess in the valve bore by threaded portions of the ring and bore such that, when the ring is in position, the threaded portion on it has passed right through the threaded portion of the bore, there being a radial expansion gap between part of the ring and the recess.

Abstract: External leakage around the actuator-stem of a plug valve is prevented by the application of forces to the lower surface of the valving member whereby to normally advance and maintain sealing surfaces on the upper end of the valving member against and in sealing relationship with a diaphragm.