9650 Valve Series
Installation and Maintenance Manual
35
6.3
MAINTENANCE – 2 PIECE FLANGED VALVES
Caution: following ANY valve maintenance it is required to fully test valve operation and to complete fps valve
automated valve repair check sheet FP081.0.
NOTE: FPS DOES NOT AUTHORIZE BODY OR ACTUATOR REPAIRS ON FM APPROVED VALVES. PLEASE CONTACT
THE FACTORY FOR ANY REPLACEMENT OF VALVE OR ACTUATOR.
CAUTION: BALL VALVES CAN TRAP FLUIDS IN THE BALL CAVITY WHEN CLOSED. RELIEVE LINE PRESSURE PRIOR TO
SERVICING VALVE.
Rebuilding:
A repair kit may be ordered for these valves, consisting of seats, stem seals, stem O-ring, gland packing
and gaskets. See Section 9 for applicable part numbers.
Disassembly (Refer to exploded view of flanged valve):
To replace the seats and seals:
1)
Ensure valve is in its fail-safe (not actuated) position fully open or closed position before disassembly. Pressure
trapped in the valve or actuator if partially stroked could be hazardous.
2)
De-pressurize process media and instrument air and turn off electrical power to the valve before attempting
any repair.
3)
Remove the handle/actuator/solenoid /limit switch.
4)
Place the valve in the open position using a wrench on the valve stem. Unscrew all flange bolts or studs & nuts
and remove valve from the line.
5)
Remove end cap bolts.
6)
Remove end cap to expose the ball and ball seats.
7)
Remove the valve stem from the bottom of the valve body including the stem seals and O-ring.
8)
Remove body seal, ball & seat.
9)
Remove the gland packing at the top of the valve body.
10)
Clean all sealing surfaces of the valve including the ball.
Note: The ball and surfaces against which the seats and seals are installed must be undamaged, clean and free of pit
marks and scratches. Light marring from the action of the ball against the seats is normal and will not affect the
operation of the valve. Flaws which can be seen but not detected with fingertips are acceptable. The stem and body
surfaces that the stem seals contact must be undamaged, clean and free from pit marks and scratches.
Assembly (Refer to exploded view of flanged valve):
1)
Lightly lubricate the ball and seats with AeroShell Grease 22.
2)
Place new stem seal and O-ring on stem and insert assembly through the body cavity.
3)
Place the new gland packing into the top of the valve body cavity.
4)
Insert far seat in body ensuring that the seal rests firmly on the back surface of the recess.
5)
Place stem in the closed position. The scribed line on the top indicates direction of flow through the ball.
6)
Insert ball into body so that stem slot engages tang on stem.
7)
Insert body seal ensuring that it is resting squarely on the seal surface of the body.
8)
Insert seat in recess of end plug and slide the end plug into the body as far as it will go.
9)
Secure the end cap in place by threading in the end plug body bolts and tightening each one firmly.
10)
Ensure that all seats and body seals are in the correct position.
11)
Replace the handle/actuator/solenoid /limit switch.
