Data Sheet for Product

Technical Bulletin 656 Powermite Valve with 3-inch Top Rebuilding
Document Number 155-240P25
March 7, 2005
Page 4 Siemens Industry, Inc.
Disc Replacement
Normally Open Valves
(See Figure 3 )
1. Loosen and unscrew the bonnet from the valve body.
2. Holding the disc holder securely with pliers, use a hex Allen wrench to unscrew the
throttling nut from the stem assembly.
3. Remove the disc from the stem assembly and replace with new disc.
4. Return the throttling nut to the stem assembly.
5. Remove and replace the O-ring, if present. Apply silicone grease to the O-ring.
6. Thread bonnet onto the valve body and tighten it.
Figure 3. Normally Open Valve Disc Replacement.
Normally Closed Valves
Model 1
1. Unscrew the valve cap from the bottom of the valve body. Remove the valve spring
and throttling nut assembly.
2. With a 7/16-inch wrench hold the disc holder guide, and with a wide blade
screwdriver in the throttling nut slot, separate these parts and remove the disc.
3. Replace the disc in the disc holder. Tighten the throttling nut while holding the disc
holder guide.
4. Place the throttling plug assembly into the valve body and tighten the valve cap.
Figure 4. Normally Closed Valve Disc Replacement Model 1.