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Operation and Maintenance Instructions
Operation
also that all pin joints and linkages are greased and checked for freedom of movement.
Maintenance
It is always recommended that wherever work is being carried out on a valve that may involve the
release of any internal pressure, the valve is fully isolated and depressurised prior to carrying it out,
It is essential that the user of the valve is aware of the weight of the components and / or
assemblies that must be handled and manipulated during installation and maintenance. It is the
users responsibility to ensure that safe working practices are followed at all times.
· Regularly lubricate cylinder and all pin joints and linkages.
· Check for freedom of operation and/ or movement.
If tight:
External Check
1. Ensure all pin joints and linkages are free from bending and are lubricated.
Internal Check
2. Remove the piston assembly
4. Inspect piston seal and face seal for wear, damage or cuts etc. (to replace seal see P12)
6. Inspect valve guide and seat ring for damage/ scoring due to grit, stones or other debris
8. Reassemble piston components and use correct torque on piston bolt (50-100) and bolts
(150mm to 300mm) diameter
10. Ensure that piston is free moving vertically and rotates freely through 360 degrees
13.
Touch up any coating or damage
·
After re-commissioning check for leaks
· Periodically check
1. Freedom of movement (lubricate)
3.
All bolts and fasteners for tightness
4. Coating and touch up as required
Damage in Rubber Seal
