Liquid End

Steam driven pumps use as displacer either a piston that is sealed to the hydraulic cylinder by piston rings, or in case of high discharge pressures, a plunger with packing.

Double-acting means that during pump operation, the fluid on one end of the piston is in the suction phase while the other end of the piston is in the discharge phase.

Therefore, a double - acting pump makes two suction and two discharge strokes for each complete reciprocating cycle and has two suction and two discharge valves.

The valves installed on the liquid end are either wing type for clean fluids with low viscosity, or ball valves for fluids having high viscosity and/or containing solids. The piston rod packing prevents liquid from leaking out of the hydraulic cylinder.

All models can be supplied with a stuffing box cooling jacket on the hydraulic side.