TOV
Installation, Operation and Maintenance Manual
8
WKM-TOV-IOM
Procedure
The following procedure applies to new installation
between standard ASME B16.5 pipe flanges.
When replacing a valve from an existing installation,
The flange faces shall be cleaned of any residual
gasket material before starting.
Actuation shall not be removed from the valve for
installations unless the actuator must be transferred
during replacement.
1. Protective covers shall be removed from the valve.
Be sure valve is completely closed.
2. Lug body valves shall be positioned between the
flanges with gaskets properly centered and then the
bolting inserted (Figure 4).
3. Disc clearance shall be carefully checked by placing
the valve in the full open position. Should automated
valves be difficult or impossible to cycle, check that the
raised face of the flange matches the raised area on
the valve face.
4. All bolting shall be tightened in a crossover or star
pattern to insure even sealing (Figure 4), refer figure 9
for star pattern tightening method
5. Packing retainer tightness is pre-tested at the
factory. Should shaft leakage occur at start-up, the
packing retainer can be adjusted to stop the leak.
Avoid over tightening which may result in excessive
operating torque or premature packing wear.
Worm gear operated
Worm
gear
operators,
available
as
standard
equipment on all valves, which are not power actuated,
have an arrow on top of the operator that indicates the
"OPEN - CLOSED" position of the disc (Figure 5)
Counter-clockwise rotation of the hand wheel opens
the valve, clockwise rotation closes the valve.
Raised Face Area
Lug Body
Figure 5: Gearbox
Figure3: Flange detail
Figure 4: Lug body
Close stop
adjustment
Open stop
adjustment
