Valve Operating Conditions; Valve Open; Valve Closed; Valve Closed, Upper Seat Lifted - Waukesha Cherry-Burell W75RS PMO Operation And Maintenance Manual

Waukesha Cherry-Burrell

Valve Operating Conditions

August 2008
See Figure 5 on page 11 for port and corresponding chambers.

Valve Open

The valve is open when Chamber 1 is
pressurized and Chambers 3 and 2
are vented. See Figure 7.
Figure 7 - Valve Open
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 9.
Figure 9 - Valve Closed, Upper Seat
Lifted
95-03076
Operation

Valve Closed

The valve is closed when Chambers
3, 1, and 2 are vented. Large spring
closes the valve to fail-safe position.
See Figure 8.
Figure 8 - Valve Closed
Valve Closed, Lower Seat
Push
For cleaning the lower seat. Chamber
3 is pressurized, and Chambers 1 and
2 are vented. See Figure 10.
Figure 10 - Lower Seat Lowering
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