MKS T3PIA, Instruction Manual, Page: 49 / 70

Preventive Maintenance Chapter Five: Maintenance and Troubleshooting
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Reassembly
1. Insert the seal ring into the valve body so it is approximately centered within the valve bore and the
handle is located approximately as indicated on the body. Refer to Figure 21.
Figure 21: Seal Ring in Valve Body
2. With one hand, hold in the MAINTENANCE button. (This will move the locking pins into a position that
allows the seal ring to be locked.)
Note The software looks for the MAINTENANCE button only if the valve is in position mode AND
the valve is at 100 percent.
3. While keeping the MAINTENANCE button depressed, align the seal ring with the locking pins in the
body and lock the seal ring by moving the handle in the indicated direction on the handle.
4. Release the MAINTENANCE button.
5. Install the gate and tighten the bolt. The bolt(s) that attach the gate to the shaft are to be torqued to
175 lbf-in (20 Nm). Make sure the gate is fully engaged on the shaft before tightening. For gates with two
bolts, only one bolt will be accessible; tighten this bolt only.
6. At the Pendulum Maintenance Mode Screen, select the “ Move Gate to 50 Percent Position ” command.
(This will move the gate to the 50% position and allow access to the outer bolt (if applicable) holding in
the gate.)
7. If the valve has two bolts, tighten the outer bolt now.
8. If this valve is controlled via DeviceNet or Analog/TTL, at the Pendulum Maintenance Mode Screen ,
select the “ Learn Valve ” command.
9. If, and only if, this valve is controlled via an analog/TTL I/O interface, change the “Control Mode” on the
top of the valve enclosure to the “Learn Valve” position.
10. The Learn Valve sequence will take approximately 1 minute.
11. Install the valve cover and tighten the screws to the following torque.