Waukesha Cherry-Burrell
®
Brand W70 Series Mix Proof Valves Maintenance
10/2023 95-03087 Page 23
Inspection
Inspect the following on a regular basis:
• Actuator connections for air leaks
• Valve body and stem O-rings
• Valve seats (If leakage occurs, see “Troubleshooting” on
page 94.)
• Pneumatic connections:
– Air pressure at supply connection
– Air lines for kinks and leaks
– Threaded connections for tight fit
– Clean air filter at regular intervals
• Electrical connections secure on control module:
– Wire connections tight on terminal strip
– Electrical connections to control module
– Threaded strain relief for tight fit.
Lubrication
No lubrication is required other than as noted in the disassembly
and assembly procedures. Use Dow Corning #7 or equivalent
food grade non-petroleum (silicone) grease on seals and O-rings.
Apply Bostik Never-Seez
®
White Food Grade with PTFE or
equivalent to all bolts and threaded stem parts.
Cleaning
Cleaning-In-Place (CIP)
CIP methods can be used to clean installed automatic valves
without disassembly. Select methods based on the specific
requirements of sanitarians and each application. Check with
local chemical suppliers for the most effective cleaning agents
and procedures intended for the application, in order to properly
dissolve the product residue. Ensure that the cleaning agent is
compliant with the temperature range and elastomer material.
Mix Proof valves can be fitted with a 1/4 NPT flush connection for
rinsing the area between the seats and the vent/drain port. The
area can be flushed regularly in the event of long times between
CIP cleanings. See "External Flush - Liquid Vent Cavity," starting
on page 14.
Do not put a hand into the yoke or body
of a pneumatically-actuated valve.
Avoid splashing any liquid into the air
vent of the actuator during clean up
NOTE: Actuate each valve or use seat
lifting to ensure effective cleaning and
sanitizing. Expose all product-contact
surfaces to the appropriate cleaning
solutions.
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