Flowserve F519 Flanged ANSI - Manual (Page 8)

9 REFURBISHMENT INSTRUCTIONS
Prior to commencing any work on the valve or removing it from line, refer to the 'Health
& Safety' Instructions.
NEVER remove or maintain a valve or joint unless the line has been fully de-pressurised,
drained and where necessary, purged of toxic / explosive / flammable media.
9.1 DISMANTLING
a) Ensuring that it is correctly supported, remove the valve from the pipeline by extracting the flange
bolting from each end.
b) With the valve securely clamped and in the open position, undo the insert using the appropriate drive
adaptor. It will be necessary to use a heavy mallet on the tommy bar of the insert tool to break the
metal to metal seal.
c) Remove the insert to allow access to the cavity.
d) Remove the body seal and discard. Close the valve and using a soft drift through the body port, tap
out the ball and insert seat.
e) Turn the stem back to the open position and, using a suitable hook, pull out the body seat being
careful not to damage the seat sealing face of the valve body.
f) To dismantle the stem assembly remove:
Wrench Nut
Wrench Nut Spring/Star Washer
If fitted
Wrench
Gland Nut Locking Clip
Gland Nut
Disc Springs
Gland
g) Withdraw the stem from inside the body (N.B. with 15mm (½") valves the gland packing must be
removed and the wrench flats of the stem must be aligned across the valve to allow withdrawal of the
stem). The gland packing and thrust seal can now be removed from their recesses, being careful not
to damage the seal faces.
h) All components not replaced by items in the repair kit should be thoroughly cleaned and stored in a
clean secure area. All sealing faces on the body, insert and ball must be checked for corrosion,
erosion and scratches. If damage is found or there is any doubt, replace the component.
i) Cleaning the valve parts should be carried out using a suitable degreasing agent. Hard deposits can
be removed using stainless steel wire wool. Care should be taken on all seal faces to avoid damaging
them.
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