This piston also has an in-built pressure relief valve. The oil from the relief valve returns to the pump reservoir connection by means of flexible pipe. The first piston is located axially; it extends beyond the end of the tube and is drilled to suit a pressure gauge and a high pressure flexible rubber hose connecting the hand operated pressure pump to the unit.
The thin cylinder unit and hand operated pump are mounted on a bench-top base plate.
A thin wall tube contains two pistons.
The cylinder unit which is resting on the four pins is supported on a frame and located axially by a fixed stop and an adjustable stop.
The second piston is free to move axially within the tube, but its travel out wards is limited by a plate and end-cap.
Maximum test pressure: 40 bar.
Technical data about the thin cylinder unit:
Reservoir Capacity: 75 cm3
Pre-set relief valve setting: 450psi approx.
Cylinder material: Aluminium alloy.
Recommended oil: Castor oil
Gauge Factor: 2.0
Pressure gauge (Manometer): 0-50 bar.
Strain gauges: Foil type.
