Data Sheet for Product

656 Powermite Valve with 3-inch Top Rebuilding Technical Bulletin
Document Number 155-240P25
March 7, 2005
Siemens Industry, Inc. Page 3
Diaphragm and
Quad Ring
Replacement,
Continued
9. Before installing the new quad ring, clean the stem and the quad ring recess to
remove any foreign matter. Apply a light coating of silicone grease to the valve
stem, bonnet chamber, and quad ring.
10. Place the new quad ring in place and reinstall quad ring retainer over new seal with
the shorter portion of the retainer next to the quad ring.
11. A new push-on retaining ring must be used because the old ring is usually damaged
when it is removed. Place a little silicone grease on the end of a piece of 5/8-inch
OD copper tubing to hold the ring. See Figure 2. Use the tubing to press the ring
into place.
NOTE: The bent edges of the retaining ring must face the tubing.
Figure 2. Replacing the Push-on Retaining Ring.
12. Slip the spring washer and spring over the stem. Place the piston plate with the cup
side up over the spring. Press down on the piston plate to compress the spring. Clip
the E-ring into the groove in the stem. Place the piston cup over the piston plate.
13. Replace the diaphragm with the word “Top” and the letter “A” on the outside facing
the upper housing. Diaphragm can be turned inside out to do this.
14. Place upper housing over the lower housing and fasten with the housing screws.