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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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SPX W Series Specifications

General