Waukesha Cherry-Burrell
®
Brand W70 Series Mix Proof Valves Operation
10/2023 95-03087 Page 21
Valve Closed, Lower Seat Push
(for W72RS/W72RSP Series Only)
Chamber 3 is pressurized, and Chambers 1 and 2 are vented.
See Figure 15. 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 16.
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 15 - Lower Seat Push for W72RS
Series
Figure 16 - Lower Seat Lift for W71/W73
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