Instruction manual

Instruction Manual
D500248X012
A31D Valve
April 2014
15
WARNING
Avoid personal injury or property damage caused by the impact of a falling or tipping of a large valve. Support large valves
during maintenance.
6. To complete this step, stand the valve up. Support the valve securely using methods appropriate for the valve size.
Ifaviseorotherclampsarebeingused,besuretonotdamagetheflangegasketsealingareaofthevalvebody.
7. Manually rotate the drive shaft (key 3) to turn the disk clockwise to meet the seal.
8. Tap the disk with a rubber mallet to drive it against the internal travel stop. When the disk makes contact with the
stop, manually rotate the disk counterclockwise back out of the seal to a 90-degree open position. Repeat steps 7
and 8 three times.
Note
When attaching the actuator to the valve, make sure the valve disk is not in contact with the valve internal travel stop (see figure
5). The valve disk should be positioned from 0.25 to 0.76 mm (0.010 to 0.030 inch) away from the internal stop in the valve body
(see figure 5).
9. Use an appropriate tool (such as a feeler gauge) to position the disk (key 2) from 0.25 to 0.76 mm (0.010 to 0.030
inch) away from the internal stop in the valve body.
This adjustment is necessary to be certain that the actuator output torque is fully absorbed by the actuator travel stop
or by the actuator. The internal travel stop in the valve body should not absorb any of the actuator t orque.
CAUTION
When using an actuator, the actuator travel stop (or actuator travel, for actuators without adjustable stops) must be
adjusted so the disk stop in the valve does not absorb the output of the actuator. Failure to limit the actuator travel as
described in the Adjusting the Actuator Travel Stops or Travel steps can result in damage to the valve, shaft(s), or other
valve components.
10. The final seating of the retaining ring screws can now be done. For the screw torque values, refer to table 5.