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gruvlok installation and assembly
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FTV-S (Straight) & FTV-A (Angle Body)
Tri-Service Valve
OPERATION
To assure tight shut off the valve must be closed using a wrench with
25 to 30 ft./lbs of torque.
To assure trouble-free check valve operation and shut off operation,
the valve should be periodically opened and closed to keep valve seat
and valve disc guide stem free of build up of system contaminants.
REPACKING OF FTV VALVE UNDER FULL SYSTEM PRESSURE
Should it be necessary, stem “O” Ring can be changed under full
system pressure.
1Record the valve setting.
2Turn the valve stem counterclockwise until the valve is fully open
and will not turn any further. Torque to a maximum force of 45 ft./lbs.
This will ensure good metal-to-metal contact and minimum leakage.
3The valve bonnet may now be removed. There may be a slight
leakage, as the metal-to-metal backseating does not provide a
drip-tight seal.
4Clean exposed portion of valve stem (Do not scratch).
5Remove and replace the “O” Ring and gasket.
6Install the valve bonnet.
7Tightening valve bonnet is necessary to stop any leaks.
8Open valve to balance set point as recorded in Step 1.
CAUTION: Safety glasses should be worn.
MAXIMUM NUMBER OF TURNS FULL OPEN VALVE
On valve sizes 21/2" and 3", full open position of valve is 5 turns.
However, valve will open to 51/2 turns which is just back of seating of
valve.
SEAT REPLACEMENT
1Drain system and remove valve from piping.
2Remove the body bolts from the body using an Allen Key.
3Remove seat and “O” Ring. “O” Ring is not used on valves 8" and
larger.
4Clean exposed portion of valve stem (Do not scratch).
5Remove and replace the “O” Ring and gasket.
6Inspect and clean “O” Ring cavity and install new “O” Ring and seat.
Valve disc stem also should be inspected and replaced if worn.
Valve stem “O” Ring should be replaced at this time.
GL-2.10