User Guide

CHECKOUT

1. Drive the actuator so that the valve stem is fully up. If the valve is a three-way, check for

plunger compression. See Figure-6.

2. Drive the actuator so that the valve stem is fully down. Check for plunger compression.

See Figure-7.

Note:

Check the plunger spring compression, refer to Figure-6 and Figure-7. The length of

the stem extension should be adjusted so that the valve disc seats before the actuator

reaches the end of the closing stroke. The balance of the actuator stroke is taken up in the

plunger spring compression, which should be approximately 1/16" (1.6 mm). This provides

pressure on the disc in the closed position(s) and also compensates for disc and seat wear.

On three-way valves, spring compression must be provided on both upper and lower seats.

Figure-6 Valve Compression Stem Up.

Figure-7 Valve Compression Stem Down.