GLOBE VALVES OS & Y - FORGED - ISO 15761/API 602/B16.34
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
15
Back seating the valve and attempting to repack under pressure is hazardous and is
not allowed under any circumstances. Rather than attempting to repack under
pressure, it is preferable to use the backseat to control the stem leakage until
shutdown of the line provides safe repacking conditions.
Prior to replacing the packing rings, remove all pressure from the valve. If the
backseat faces have been damaged by foreign material the backseat may leak into
the packing chamber.
3.4 PREVENTATIVE MAINTENANCE AND PERIODIC INSPECTIONS
APV recommends that periodic inspections be carried out on all valves. The frequency of these inspections
depends on the severity of the service and the frequency of the valve operation. As a minimum, all valves
should be inspected quarterly to ensure proper operation and discourage the damage compounding
effects of leakage. The following list details the specific valve types and areas requiring inspection and
maintenance.
Item to Inspect
Stop Check
Globe
Check all lubrication points
Check body/bonnet join for leaks
Check for packing leaks
Check stem threads for wear
Ensure stem and seal areas are free from debris
If conditions permit, operate valve
Inspect all external connections
Inspect condition of actuator and/or gear operators (if applicable)
Inspect valve for obvious damage
Do not remove or loosen the packing gland or bonnet bolts while the valve is
pressurised.
1. The valve stem packing should be inspected monthly. If the stem packing shows signs of leakage,
simply tighten the adjusting nuts to compress the packing. Do not over tighten the adjusting nuts as
this will make operation of the valve more difficult. If, after tightening the adjustments nuts to their
fullest extent, the leakage does not stop, it is then necessary to replace the stem packing. It is not
recommended that additional packing rings be added to the stuffing box as this may cause damage to
the stem sealing system. For packing replacement see Section 3.3.
2. The lubrication of the yoke nuts should be inspected at least monthly. A high pressure grease gun
should be used for valves supplied with ball type grease fittings.
