includes a precheck valve, load/unload valve, and float
(b) The fluid raises a float in the float valve
which shuts off fluid flow through port Y (load/unload
valve must be in a load position).
(1) Precheck Valve.
(c) With flow shut off, the pressure in the
(a) In the open position, this valve allows
fluid from the inlet of the 4-inch control valve to reach the
4-inch control valve then closes the 4-inch control valve
and stops bottom load operation.