Maintenance; General; In-Line Leakage; Stem Leakage - Flowserve Worcester V-Flow 51 Series User Instructions

7

Maintenance

7.1

General

Worcester valves are trouble free and maintenance is rarely needed. The following
checks will help extend life further and reduce downtime:
a) Every 25 000 cycles or three months, check for signs of leakage (section 7.2, 7.3,
7.4) and that all fasteners (including gland nut) are tightened to their correct
torque value (see section 0)
b) The valve should not be left standing without operation for more than one
month. After this period, the valve should be operated through three full cycles.
c) The valve should not be left in a partially opened position as this may cause
damage to the seat and reduce its life.
7.2

In-line leakage

Any leakage when the valve is fully closed will be due to damage to the body,
connector, seat or ball sealing surfaces. It will be necessary to disassemble and
repair the valve (see section 9).
7.3

Stem leakage

Remove the wrench (see section 9) or the actuator (see appropriate IOM), followed
by the gland nut locking clip, and tighten the gland nut to the correct torque (see
section 10.1). If leakage persists, it may be necessary to replace gland packings and
thrust seals (see section 9).
7.4

Body/Insert/Connector leakage

Insert: Remove the valve from line. Then remove the insert to assess whether the
body and insert seal faces have been damaged. Replace the body seal, and
tighten the insert to the correct torque (see section 10.3).
Connector: Ensure that the bolting between the two halves of the body is tightened
to the correct torque (see section 10.4). If leakage persists, remove the valve from
line and replace the body seal and also establish whether the seal faces of the body
and connector have been damaged.
8

Repair Kits

a) Repair kits are available for all Worcester valves. Control valves have special
features over standard valves and as such, repair kits for standard valves must
not be used. Details of their contents are found in the instruction sheet supplied
with the kit.
b) If other parts are required, it is usually recommended that the complete valve is
replaced. Parts from different sized/rated valves must not be interchanged.
c) Only Worcester authorised spare parts should be used. This includes basic
components such as fasteners. Flowserve Flow Control accepts no responsibility if
the valve is altered in any way without consent.
Worcester V-Flow 51 / 52 Series User Instruction – WCENIM0026-01
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