
Maintenance
Waukesha Cherry-Burrell Brand W71/W72RS Sch. 5 Mix Proof Valves
Page 24
95-03091
08/2018
Cleaning Procedure
Mix Proof valves are designed to use a cleaning solution supplied
by a CIP system. The vent outlet/cavity must be unobstructed to
guarantee the leakage of fluid to atmosphere.
Establish cleaning procedures for each installation depending on
product characteristics, operating parameters (temperature,
velocity, valve cycles), and product velocities.
The following statements are intended as suggestions or
guidelines for cleaning procedures and will vary by application:
•
For seat lifting valves, when the upper or lower body is in
CIP, seat movement should occur. Seat cleaning positions
are factory-set and marked in the yoke area. Seat cleaning
will produce visible leakage from the vent outlet. Brief
multiple lifts should occur for each step in the CIP program,
excluding the initial rinse.
NOTE:
Seat cleaning is not
recommended during the initial rinse.
•
Maximum Solution Temperature is 180°F (82°C).
•
Maximum line pressure during seat cleaning is 90 psi (6.2
bar).
•
Minimum cleaning solution velocity is 5 ft/s (0.3 m/s).
•
Cleaning time is dependent on the inlet pressure. The
recommended cycle time is 3 to 5 seconds per cycle after the
valve achieves the seat clean position. This seat clean cycle
time of each valve should be visually confirmed during
commissioning.
•
Typical cleaning procedures include pulsing the seat during
cleaning until the valve has been demonstrated to be clean.
This is usually accomplished in 3 to 5 consecutive pulses per
step in the CIP program; however, each installation and
product varies, so pulsing should continue until all product/
debris is removed.
•
For the optional external flush of the vent cavity, water flush
can be activated during the final rinse.
•
Every few months of operation, remove and inspect one
valve in the system to ensure that complete cleaning is being
achieved.
CAUTION
During valve opening and CIP cleaning,
fluid escapes from the drain port. Drain it
off to prevent any possible hazard to
personnel.