Data Sheet for Product

Technical Bulletin 656 Powermite Valve with 3-inch Top Rebuilding
Document Number 155-240P25
March 7, 2005
Page 6 Siemens Industry, Inc.
Throttling Plug
Replacement for
Water Mix Flared
End Valves,
Continued
3. To disassemble the stem assembly, put 20 psi (138 kPa) air pressure on the valve
actuator. Hold the stem with a 3/32-inch hex Allen wrench and use a 1/4-inch wrench
to unscrew the throttling plug locknut from the stem assembly. Note the orientation of
the plug before removing it because the replacement plug must be installed with the
same orientation.
4. Separate the throttling plug from the stem. Replace with new plug.
5. Put 20 psi (138 kPa) air pressure in the actuator. Insert the allen wrench in the end of
the stem and while holding it steady, tighten the locknut against the throttling plug. Be
careful not to twist the stem.
6. When assembling the lower seat, assemble gasket, lower seat, and seat retainer into
the valve to within one turn of being tight using the special seat removal tool.
7. Apply 20 psi (138 kPa) air pressure to the top of the valve. Turn the seat retainer until
it is tight. The plug is now making contact with the lower seat.
8. Tighten the valve cap to the valve body.
Figure 7. Water Mix Flared-End Throttling Plug Replacement.