Waukesha Cherry-Burrell Operation
10/2012 95-03087 Page 19
Valve Closed, Upper Seat Lifted
For cleaning the upper seat on seat lifting models only. Chamber
2 is pressurized, and Chambers 3 and 1 are vented. See Figure
12.
Valve Closed, Lower Seat Push
(for W72RS/W72RSP Series Only)
Chamber 3 is pressurized, and Chambers 1 and 2 are vented.
See Figure 13. For W72RS/W72RSP Series valves, the lower
seat is pushed down for seat cleaning.
Valve Closed, Lower Seat Lift
(for W71/W73 Series valves only)
The lower seat is lifted for seat cleaning. See Figure 14.
NOTE: On W73 Series valves, the middle-to-lower port divert
stem has single-seat protection and cannot perform an
independent seat clean operation when the valve is closed or
open.
Figure 12 - Valve Closed, Upper Seat Lifted
Figure 13 - Lower Seat Lowering for
W72RS Series
Figure 14 - Lower Seat Lift for W71/W73
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