Waukesha Cherry-Burrell
®
Brand W70 Series Mix Proof Valves Operation
10/2023 95-03087 Page 17
Operation
All functions of W70 Series Mix Proof valves are pneumatically
controlled using a 75 min. to 90 max. psi (5.2 to 6.2 bar) clean air
supply.
The valve contains a large and small spring in the valve actuator.
The springs compress the valve seats to seal closed.
Large Spring
• Located in top air chamber of cylinder.
• Holds valve in the closed position.
Small Spring
• Located in the extended hub of the upper piston.
• When the valve is open, the spring acts on the upper seat
stem to hold the upper and lower plugs together.
Solenoid Valve Port
Connections
Up to three air supplies controlled by solenoid valves supply air to
the valve actuator (Figure 10).
1 = Valve Open Inlet Solenoid
2 = Upper Seat Clean Inlet Solenoid*
3 = Lower Seat Clean Inlet Solenoid*
ON = Solenoid energized (OPEN). LED is lit.
OFF = Solenoid de-energized (CLOSED). LED is off.
Solenoids are normally closed.
Air connections are 1/8" NPT x 1/4" push-to-connect poly tube
fittings.
* Seat lifting is an option which requires (2) two additional air
supplies. Non-seat lifting valves (NSL) only have one air inlet (1).
For specific air-routing and solenoid porting, please refer to
control module publication 95-03083.
Figure 10 - Solenoid Valve Port
Connections
Table 3: Solenoid/Valve Position
Condition Solenoid 1 Solenoid 2 Solenoid 3
Closed OFF OFF OFF
Open ON OFF OFF
Upper Seat Clean * OFF ON OFF
Lower Seat Clean * OFF OFF ON
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