JAG
flocomponents FB2 IOM
2012
Page
5
of
8
www.JAGvalve.com
JAG.FB2.IOM.Rev.0
seat or ball necessitates dismantling the
valve.
Leakage at Pipeline Joint: Test for tightness
of flange bolting. If slack, tighten bolting to
gasket/bolting manufacturer's recommended
torque. Ensure pipe work flanges etc., are
square, true and that piping is properly
supported to prevent line buckling.
Note: Over tightened bolts can cause flange
leaks as excessive force can cause flanges
to bow.
7.2
Dismantling the Valve
Remove the gland nut (14) and handle
(22) (or gear box if applicable);
Remove stopper (16), gland nut (14), lock
washer (18), locking plate (17), belleville
washers (21) and packing ring (6);
Remove nuts (13);
Remove cap (2);
Place Valve in closed position and
remove Ball (3);
Push stem (4) through body (1) from
the outside in;
Remove seats (5) from body (1) and cap
(2)
Remove old packing (10) from body (1)
The valve has now been dismantled. It can
be cleaned and checked for wear and
damage. Damaged seats must be replaced
and therefore a new set of seats should be
fitted into body of cap. New sets of 'O' Rings
and firesafe seals should be fitted and any
other defective parts replaced.
7.3 Assembling the Valve
Replace seats in body (1) and caps (2);
After replacing thrust washer (7) and O-ring
(11) push stem (4) internally through the
body (1)
When fully located turn stem one complete
revolution to ensure smooth action;
Line up stem (4) and replace ball (3) into
body (1);
Replace body seals (8) (9)
Fit cap (2) over studs (12) and replace and
tighten nuts (13). (See Section 11.1 for
tightening torques);
Replace packing (10) over Stem (2) and into
body (1);
Replace packing ring (6) over stem (2) and
onto packing (10);
Replace belleville washers (6) over stem (2);
Replace gland nut (14) and torque nut to
30ft/lbs of torque;
Replace lock washer (18) and bend over
gland nut (14)
Replace stopper (16) and locking plate (17),
Replace Handle (22) and gland nut (14)
Check stem action. (4)
Check Open and closed position.
Always maintain valve cleanliness during
assembly procedure.
The valve has now been assembled ready
for test.