Flowserve F519 Flanged ANSI - Manual (Page 7)

7 MAINTENANCE
7.1 GENERAL
With self wipe ball / seats and patented pressure equalising slots, Worcester valves have long, trouble
free lives and maintenance is seldom needed. The following checks will help extend life further and
reduce plant problems:
Routine checks / maintenance:
i) Every 25000 cycles or 3 months: Check for any signs of leakage (see 7.2, 7.3 & 7.4 below)
and that all fasteners (including the gland nut) and joints are tightened to their correct torque
value (see Section 10).
ii) Infrequent operation: The valve should not be left standing without operation for more than
1 month. After this period the valve should be operated through three full cycles.
7.2 IN-LINE LEAKAGE
Check that the valve is fully closed. If it is, then any leakage will be due to damage to the body,
insert, seat or ball sealing surfaces and it will be necessary to dismantle the valve to repair it.
(see Section 9 & 10).
7.3 STEM LEAKAGE
Remove the wrench assembly as detailed in section 9 or the actuator as detailed in the relevant
actuator I.O.M., followed by the gland nut locking clip, and retighten to the recommended torque. If the
leakage persists then it will be necessary to dismantle the valve to establish the cause and/or replace
gland packings and thrust seals (see Section 9 & 10).
7.4 BODY/INSERT LEAKAGE
If leakage occurs here, it will be necessary to remove the valve from line. Remove the insert and
establish whether the body and insert seal faces have been damaged. Replace the body seal,
refit and tighten the insert to to the recommended torque value (see Section 9 & 10).
8 REPAIR KITS
Repair kits are available for all Worcester valves. Details of their contents are found in the Instruction
sheet supplied with the kit.
If other parts are required, it is usually recommended that the complete valve is replaced, although
piece parts are available. Parts from different sized / rated valves must not be interchanged.
Only Worcester authorised spare parts should be used. This includes basic components such
as fastenings. Flowserve Flow Control (UK) Ltd will accept no responsibility if the valve is
altered in any way without the consent of Flowserve Flow Control (UK) Ltd.