Abstract: A fluid control valve includes first and second valves. The first valve is adjustable under the control of a first valve actuator between a closed position in which flow of fluid through the first valve is prevented and an open position in which flow of fluid through the first valve is permitted. The second valve comprises a second valve actuator adapted such that the first valve actuator bears against the second valve actuator in each of said first and second positions to urge the second valve into an open configuration allowing flow of fluid. The first valve actuator is adjustable to a third position in which the first valve actuator is spaced from the second valve actuator by a separation sufficient to allow fluid pressure at the inlet to cause the second valve to close, preventing flow of fluid through the fluid control valve.

Abstract: A system for quickly removing and installing check valve parts without disturbing system piping attached to a pump. The system includes a first adapter attached to the outlet of the pump head. The first adapter includes a valve seat and a housing with a side wall having external threads. A second adapter includes a hollow body with a space for a check valve. The body has an opening in the side wall for inserting the check valve. The second adapter fits over the first adapter and the adapters are attached by means of a collar. Tightening the collar onto the threads on the first adapter causes the check valve to be held firmly between the valve seat and the top wall of the second adapter.