Precautions with Over-Centre Valves and Check Valves

Cylinders, fitted with Check Valves and or Over-centre Valves, can remain pressurised. The pipes connecting the 'B' port to the Check/Over-centre Valve Block Assembly, mounted to the 'A' port, can remain pressurised.

To relieve the pressure in these systems, carry out the following steps:

(For units fitted with Over-Centre Cartridges)

• Slacken the adjustment lock nut and relieve the cylinder pressure by turning the adjustment screw anticlockwise until no resistance is noticeable (about 5 full turns)
• The Over-Centre Cartridge can now be screwed outward to a point where the sealing surfaces are separated, thus guaranteeing no pressure remains trapped in the cylinder or pipe work