Operation Waukesha Cherry-Burrell
®
Brand W70 Series Mix Proof Valves
Page 18 95-03087 10/2023
Automatic Fail-Safe
System
1 = Energized, LED is lit; 0 = De-energized, LED is off
Upper Sensor: Sends an input signal when the valve is properly open.
Lower Sensor: Sends an input signal when the valve is properly closed.
Additional Sensor: A third yoke-mounted proximity sensor is available for additional signal feedback.
* W71/W73 Valves: Seat lift during both upper and lower seat clean; indicator stem raises;
W72RS/W72RSP Valves: Seat lift during upper seat clean; seat push during lower seat clean, indicator
stem lowers.
1 = Feedback; 0 = No Feedback
* Normally Closed External Proximity Sensor; LED is opposite of feedback signal.
1 = Feedback; 0 = No Feedback
WCB 2-Piece Control Top W71/W73 W72RS/W72RSP
Valve Stem Detection Condition
Upper
Sensor
(NO)
Lower
Sensor
(NC)
Upper
Sensor
(NO)
Lower
Sensor
(NC)
Sensor Symbol
Valve Closed 0 1 0 1
Valve Open 1 0 1 0
Valve Closed with Upper Seat Clean * 0 1 0 0
Valve Closed with Lower Seat Clean * 0 0 0 1
Bürkert 8681 Control Top All W70 Series Valves
Valve Stem Detection Condition S1 S2 S3 S4* Top LED Indication
Valve Closed
1 0 0 0
Steady Red
Valve Open
0 1 0 1
Steady Green
Valve Closed with Upper Seat Clean
1 0 0 1
Fast Flashing Green
Valve Closed with Lower Seat Clean
0 0 1 0
Slow Flashing Green
CU4 Control Top W71/W72RS/W73
Valve Stem Detection Condition
Open Sensor
(Upper)
Closed Sensor
(Lower)
Valve Closed
0 1
Valve Open
1 0
Valve Closed with Upper Seat Clean
0 1
Valve Closed with Lower Seat Clean
0 0
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