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HIGH PERFORMANCE BUTTERFLY VALVE
FIGURE HPA
11
CAUTION:
•
If complete disassembly becomes necessary, replacement of seats and all seals is recommended.
•
Once the valve is dismantled, the soft seals and gasket shall be changed. Make sure these parts are available
before dismantling of valve.
8.5 DISMANTLING PROCEDURE
8.5.1 Depressurize the line and open the valve to drain
the line.
8.5.2 Before removal from the line, cycle (open and
close) the valve to relieve residual pressure in the
body cavity.
8.5.3 Always fully close valve before removing from line
to avoid damage to disc.
8.5.4 Valves shall be slung and supported properly
before loosening flange bolts.
8.5.5 Place the valve on a platform or base and
transport to repair shop.
8.5.6 Before disassembly, cycle (open and close) the
valve several times to clear it of fluid; then flush
with water.
8.5.7 Valve shall be positioned vertically by resting
body side flange on clean ground surface
(preferably covered with rubber sheet).
STOPPER BOLT ARRANGEMENT
Open position
Close position
Adjust right bolt for open position
Adjust left bolt for close position
Lock nut/check nut
Lock washer intact with nut
8.4 GEAR STOPPER ADJUSTMENT PROCEDURE
8.4.1 Before changing the setting, ensure that the nut
locking washer is intact. If not intact, then only
proceed for resetting.
8.4.2 Loosen the lock nut by unlocking the nut washer.
Loosen left side bolt for one rotation. Rotate the
handwheel in the clockwise direction to close the
valve till it is stopped by the left side bolt.
8.4.3 The adjustment of valve should be within ±5º of
mean position indicated by the indication plate.
8.4.4 Check valve leakage after adjustment. If valve is
found leaking again repeat the procedure. If no
leakage is detected, then tighten the lock nut and
lock washer.
Fig. 6
Gear unit