Waukesha Cherry-Burrell Maintenance
10/2012 95-03087 Page 21
Cleaning
Cleaning-In-Place (CIP)
CAUTION: Avoid splashing any
liquid into the air vent of the
actuator during clean up..
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.
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” on
page 13.
CAUTION:
During valve opening
and CIP cleaning, fluid escapes
from the drain port. Drain it off to
prevent any possible hazard to
personnel.
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 guide-
lines 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 visi-
ble leakage from the vent outlet. Brief multiple lifts should occur
for
each step in the CIP program, excluding the initial rinse.
NOTE: If heavy soils are experienced,
seat cleaning is not recommended
during the initial rinse.
The lower seat lift cleans the full lower stem product contact area.
The cleaning solution exits the valve from the vent cavity.
Maximum Solution Temperature is 160°F (71°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 recom-
mended 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.
NOTE: Ac
tuate 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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