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A displacement ram is a special form of single acting ram, and can be of the ‘out stroking’ style only. The diagram shows a displacement ram. Pumping fluid into port A will fill the space around the piston rod, as there is a seal between the gland and the rod the oil is contained, pumping further fluid into the cylinder will displace the volume of the piston rod and it will stroke out.
The force exerted is dependent on the piston rod diameter and the fluid pressure. Since there is no moist air passing in and out of the cylinder problems associated with rusting bores are avoided. A disadvantage is that a displacement ram of the same capacity of an ‘out stroking’ single acting ram, will be larger in diameter.