Waukesha Cherry-Burell W75RS PMO User manual

Read and understand this manual
prior to installing, operating or servicing this equipment.
Operation and Maintenance Manual
W75RS PMO Double Seat Mix Proof Valves
with the W-Series 2-Piece Control Module

611 Sugar Creek Road
Delavan, WI 53115 USA
Tel: [phone] or [phone]
Fax: [phone] or [phone]
E-mail: [email protected]
Web site: www.spxpe.com
Information contained in this manual is subject to change
without notice and does not represent a commitment on
the part of SPX Corporation. No part of this manual may
be reproduced or transmitted in any form or by any
means, electronic or mechanical, including photocopying
and recording, for any purpose, without the express writ-
ten permission of SPX Corporation.
Copyright © 2008 SPX Corporation. All Rights Reserved.
Revision Date: August 2008
Publication: 95-03076

August 2008 95-03076 Page 1
Waukesha Cherry-Burrell Table of Contents
Waukesha Cherry-Burrell Warranty ............................................... 3
Shipping Damage or Loss .............................................................................3
Warranty Claim .............................................................................................3
Safety .................................................................................................... 4
Care of Stainless Steel ......................................................................... 5
Stainless Steel Corrosion ..............................................................................5
Elastomer Seal Replacement Following Passivation ....................................5
Introduction ......................................................................................... 6
General Information ......................................................................................6
Factory Inspection .........................................................................................6
Models and Specifications ............................................................................6
Materials ...........................................................................................6
Equipment Serial Number ............................................................................6
Applications ..................................................................................................6
Operating Parameters ....................................................................................7
Temperature Range: ..........................................................................7
Seat Options ..................................................................................................7
Pressure Ratings ............................................................................................7
Installation ........................................................................................... 8
Location ........................................................................................................8
Welding Instructions .....................................................................................8
Air Supply .....................................................................................................8
Flow Direction ..............................................................................................8
Fittings ..........................................................................................................8
Pipeline Support ............................................................................................9
Stem Flush Adapter ......................................................................................9
Installing the Valve .......................................................................................9
Connecting Flush Supply Line (Optional) ....................................................10
Operation ............................................................................................. 11
Solenoid Valve Port Connections .................................................................11
Automatic Fail-Safe System .........................................................................12
Valve Operating Conditions .........................................................................13
Valve Open .......................................................................................13
Valve Closed .....................................................................................13
Valve Closed, Upper Seat Lifted ......................................................13
Valve Closed, Lower Seat Push ........................................................13
Test Procedures .............................................................................................14
Stem Gauge .......................................................................................14
Positive Fail-Safe Detection Test .....................................................14
Corrective Action ..............................................................................14
Maintenance ......................................................................................... 15
Maintenance Intervals ...................................................................................15
Inspection ......................................................................................................15
Lubrication ....................................................................................................15
Cleaning ........................................................................................................15
Cleaning-In-Place (CIP) ...................................................................15
Cleaning Procedure ...........................................................................16

Table of Contents Waukesha Cherry-Burrell
Page 2 95-03076 August 2008
Seat Lifting Adjustment ................................................................................17
Lower seat .........................................................................................17
Upper seat .........................................................................................17
Removing Valve from System ......................................................................17
Disassembly of Valve Stems ........................................................................18
Adapter Bearings and O-rings ......................................................................18
Inner O-ring and Bearing Replacement ............................................18
Outer O-ring Replacement ................................................................19
Tri Ring Seat Replacement ...........................................................................19
Radial Seal Installation .................................................................................20
Lower Bearing Carrier O-ring and Bearing Replacement ............................20
Actuator O-ring and Bearing Replacement ..................................................21
Control Top Removal and Disassembly .......................................................22
Removal from Valve .........................................................................22
Switches ........................................................................................................22
Micro-Switch ....................................................................................22
Proximity Switch ..............................................................................22
Switch Adjustment ............................................................................23
Parts Lists ............................................................................................. 24
W75RS PMO Double Seat Mix Proof Valves - Seat Lift .............................24
W75RS PMO Double Seat Mix Proof Valves - Seat Lift with Flush ...........26
W75RS PMO Double Seat Mix Proof Valve Actuator ................................28
W75RS PMO Double Seat Mix Proof Valve Bodies ...................................30
Troubleshooting ................................................................................... 31

August 2008 95-03076 Page 3
Waukesha Cherry-Burrell Warranty
Waukesha Cherry-Burrell Warranty
Seller warrants its products to be free from defect in materials and workmanship for a period of one
(1) year from the date of shipment. This warranty shall not apply to products which require repair
or replacement due to normal wear and tear or to products which are subjected to accident, misuse
or improper maintenance. This warranty extends only to the original Buyer. Products manufactured
by others but furnished by Seller are exempted from this warranty and are limited to the original
manufacturer’s warranty.
Seller’s sole obligation under this warranty shall be to repair or replace any products that Seller
determines, in its discretion, to be defective. Seller reserves the right either to inspect the products
in the field or to request their prepaid return to Seller. Seller shall not be responsible for any
transportation charges, duty, taxes, freight, labor or other costs. The cost of removing and/or
installing products which have been repaired or replaced shall be at Buyer’s expense.
Seller expressly disclaims all other warranties, express or implied, including without limitation any
warranty of merchantability of fitness for a particular purpose. The foregoing sets forth Seller’s
entire and exclusive liability, and Buyer’s exclusive and sole remedy, for any claim of damages in
connection with the sale of products. In no event shall Seller be liable for any special consequential
incidental or indirect damages (including without limitation attorney’s fees and expenses), nor shall
Seller be liable for any loss of profit or material arising out of or relating to the sale or operation of
the products based on contract, tort (including negligence), strict liability or otherwise.
Shipping Damage
or Loss
If equipment is damaged or lost in transit, file a claim at once with the delivering carrier. The
carrier has signed the Bill of Lading acknowledging that the shipment has been received from
WCB in good condition. WCB is not responsible for the collection of claims or replacement of
materials due to transit shortages or damages.
Warranty Claim Warranty claims must have a Returned Goods Authorization (RGA) from the Seller before
returns will be accepted.
Claims for shortages or other errors, exclusive of transit shortages or damages, must be made in
writing to Seller within ten (10) days after delivery. Failure to give such notice shall constitute
acceptance and waiver of all such claims by Buyer.

Safety Waukesha Cherry-Burrell
Page 4 95-03076 August 2008
Safety
READ AND UNDERSTAND THIS MANUAL
PRIOR TO INSTALLING, OPERATING OR SERVICING THIS EQUIPMENT
Waukesha Cherry-Burrell recommends users of our equipment and designs follow the latest Industrial Safety Standards. At a
minimum, these should include the industrial safety requirements established by:
1. Occupational Safety and Health Administration (OSHA), Title 29 of the CFR
Section 1910.212- General Requirements for all Machines
2. National Fire Protection Association, ANSI/NFPA 79
ANSI/NFPA 79- Electrical Standards for Industrial Machinery
3. National Electrical Code, ANSI/NFPA 70
ANSI/NFPA 70- National Electrical Code
ANSI/NFPA 70E- Electrical Safety Requirement for Employee Workplaces
4. American National Standards Institute, Section B11
Attention: Servicing energized industrial equipment can be hazardous. Severe injury or death can result from electrical shock,
burn, or unintended actuation of controlled equipment. Recommended practice is to disconnect and lockout industrial equipment
from power sources, and release stored energy, if present. Refer to the National Fire Protection Association Standard No.
NFPA70E, Part II and (as applicable) OSHA rules for Control of Hazardous Energy Sources (Lockout-Tagout) and OSHA
Electrical Safety Related Work Practices, including procedural requirements for:
• Lockout-tagout
• Personnel qualifications and training requirements
• When it is not feasible to de-energize and lockout-tagout electrical circuits and equipment before working on or near exposed
circuit parts
Locking and Interlocking Devices: These devices should be checked for proper working condition and capability of performing
their intended functions. Make replacements only with the original manufacturer’s renewal parts or kits. Adjust or repair in
accordance with the manufacturer’s instructions.
Periodic Inspection: Industrial equipment should be inspected periodically. Inspection intervals should be based on environmental
and operating conditions and adjusted as indicated by experience. At a minimum, an initial inspection within 3 to 4 months after
installation is recommended. Inspection of the electrical control systems should meet the recommendations as specified in the
National Electrical Manufacturers Association (NEMA) Standard No. ICS 1.3, Preventative Maintenance of Industrial Control and
Systems Equipment, for the general guidelines for setting-up a periodic maintenance program.
Replacement Equipment: Use only replacement parts and devices recommended by the manufacturer to maintain the integrity of
the equipment. Make sure the parts are properly matched to the equipment series, model, serial number, and revision level of the
equipment.
Warnings and cautions are provided in this manual to help avoid serious injury and/or possible damage to equipment:
DANGER: marked with a stop sign.
Immediate hazards which WILL result in severe personal injury or death.
WARNING: marked with a warning triangle.
Hazards or unsafe practices which COULD result in severe personal injury or death.
CAUTION: marked with a warning triangle.
Hazards or unsafe practices which COULD result in minor personal injury or product or property damage.

August 2008 95-03076 Page 5
Waukesha Cherry-Burrell Care of Stainless Steel
Care of Stainless Steel
Stainless Steel
Corrosion
Corrosion resistance is greatest when a layer of oxide film is formed on the surface of stainless
steel. If film is disturbed or destroyed, stainless steel becomes much less resistant to corrosion and
may rust, pit or crack.
Corrosion pitting, rusting and stress cracks may occur due to chemical attack. Use only cleaning
chemicals specified by a reputable chemical manufacturer for use with 300 series stainless steel. Do
not use excessive concentrations, temperatures or exposure times. Avoid contact with highly
corrosive acids such as hydrofluoric, hydrochloric or sulfuric. Also avoid prolonged contact with
chloride-containing chemicals, especially in presence of acid. If chlorine-based sanitizers are used,
such as sodium hypochlorite (bleach), do not exceed concentrations of 150 ppm available chlorine,
do not exceed contact time of 20 minutes, and do not exceed temperatures of 104°F (40°C).
Corrosion discoloration, deposits or pitting may occur under product deposits or under gaskets.
Keep surfaces clean, including those under gaskets or in grooves or tight corners. Clean
immediately after use. Do not allow equipment to set idle, exposed to air with accumulated foreign
material on the surface.
Corrosion pitting may occur when stray electrical currents come in contact with moist stainless
steel. Ensure all electrical devices connected to the equipment are correctly grounded.
Elastomer Seal
Replacement
Following
Passivation
Passivation chemicals can damage product contact areas of WCB equipment. Elastomers (rubber
components) are most likely to be affected. Always inspect all elastomer seals after passivation is
completed. Replace any seals showing signs of chemical attack. Indications may include swelling,
cracks, loss of elasticity or any other noticeable changes when compared with new components.

Introduction Waukesha Cherry-Burrell
Page 6 95-03076 August 2008
Introduction
For control top information, please refer to publication 95-03083. For
additional product information please see our web site at http://www.spxpe.com/
sites/wcb/literature.asp.
General Information Information in this manual should be read by all personnel involved in
installation, setup, operation, and maintenance.
Always use installation tools and lubricants recommended by Waukesha Cherry-
Burrell. Waukesha Cherry-Burrell products are subject to intensive intermediate
and final leakage and functional tests.
Waukesha Cherry-Burrell Mix Proof valves meet standards for sanitation,
design, and style.
W75RS PMO Mix Proof valves are double seat shutoff valves for separating
different media. The valves are equipped with a drain/vent for the space between
the seats equal in size to the largest port into the valve body. The seats are tended
by stems equipped with electrical switches capable of signaling whether the
upper and/or lower seat is in the proper location. W75RS PMO valves are air-
operated (air-to-raise).
Factory Inspection Each Waukesha Cherry-Burrell valve is shipped completely assembled,
lubricated, and ready for use.
Models and Specifications Materials
• Product Wetted: ASTM 316L (UNS-S31603); (DIN-1.4404)
• Non-Product: ASTM 304 (UNS-S30400); (DIN-1.4301)
• Seat Material: Tri Ring (optional)
• Elastomers: EPDM (optional)
FKM (standard)
Equipment Serial Number Waukesha Cherry-Burrell valves are identified by a serial number found on the
label on the actuator cylinder.
Figure 1 - Serial Number Label
Applications W75RS PMO valves allow for the separation of milk and milk products from
cleaning and sanitizing solutions, and are designed for installation in a milk pro-
cessing system operating in compliance with the Pasteurized Milk Ordinance and
M-A-76 Supplement #1. The valves are PMO Section 7, Item 15p(B) compliant,
and meet 3-A standards for sanitation and T-85 standard for double seat mix
proof valves.
WARNING: PMO Double Seat Mix Proof valves cannot be used to
separate raw milk and milk products from pasteurized milk, milk products
and other comestibles.

August 2008 95-03076 Page 7
Waukesha Cherry-Burrell Introduction
Operating Parameters Temperature Range:
Recommended operating temperature is determined by the material used for the
seals. No special precautions are required for applications within a temperature
range of 32°F to 180°F (0°C to 82°C).
For applications above 190°F (88°C), clearances can be affected by excessive
thermal expansion when the valve is installed in compact fabrications or
manifolds. Valve bodies have thicker cross-sections than tubing, but thermal
expansion can affect clearances in interconnecting piping sections.
This valve is NOT designed to be used under aseptic or near aseptic conditions
and temperatures.
If operating below 32°F (0°C):
• Ensure that the control air has an appropriately low dew point.
• Protect the valve stems from icing to ensure a long working life for the valve
stem seals.
Solenoid valves should not be used in the control module in room environments
below 32°F (0°C) and over 180°F (82°C), as their function cannot be guaranteed.
In those cases, install the solenoid valves in a separate solenoid cabinet.
Seal Material: Fluorelastomer (FKM) EPDM
Thermal Range
of Application:
32°F to 375°F (0°C to
190°C)
0°F to 275°F (-18°C to
135°C)
Chemical
Resistance:
Contact WCB
Application
Engineering for
other fluid
compatibility.
Silicone oil and grease Hot water and steam up to
275°F (135°C)
Aliphatic, chlorinated, and
aromatic hydrocarbons
Many organic and
inorganic acids
Oils and fats Cleaning agents, soda and
potassium alkalis
Ozone, aging, and weather
resistant
Silicone oil and grease
Many polar solvents
(alcohols, ketones, esters)
Ozone, aging, and weather
resistant
Not compatible
with:
Superheated steam Mineral oil products
(oils, greases, and fuels)
Formic and acetic acids
Seat Options
SEAT TYPE MATERIAL / MAXIMUM TEMP.
Tri Ring (TR) -
Upper EPDM Operation 280°F (137°C)
Sterile 275°F (135°C)
Radial - Lower FKM Operation 350°F (176°C)
Sterile (Consult Factory)
For higher temperature applications than those listed, please consult the factory.
*Operating conditions such as flow rate and pressure must be considered when
operating near the maximum temperature rating.
Pressure Ratings Operating Pressure: 1-1/2"- 3" sizes = 150 psi (10.3 bar); 4" size = 90 psi (6.2 bar)
Holding Pressure: All sizes = 150 psi (10.3 bar)

Installation Waukesha Cherry-Burrell
Page 8 95-03076 August 2008
Installation
CAUTION: When installing the valve, ensure that no foreign materials
(e.g. tools, screws, welding wire, lubricants, cloths, etc.) are enclosed in
the system.
Location The valve must be in a vertical position to ensure that the vent/drain outlet
system functions properly. Allow for easy access for inspection.
Ensure that the valves and pipe systems drain properly. The two-piece body
option enables the positions of the connections to be adjusted in relation to each
other.
CAUTION: Milk and milk products must be isolated away from the valve
prior to maintenance.
Welding Instructions Prior to installing, thoroughly inspect each valve. When using buttweld two-
piece body valves, use clamp connections on either the upper or lower body to
allow the o-ring seal between the bodies to be serviced.
Mix Proof valves with welded connections require the following to be performed
before installation:
CAUTION: Before attempting to buttweld an automatic valve into a line,
disassemble the body from the actuator. Dissipate heat away from the
valve body to prevent warping.
• Prior to installation, remove the stem actuator assembly and lower bearing
carrier.
• Remove all seals from the body.
• Weld the body into position, ensuring that the connection is free of tension
and distortion.
CAUTION: Welding must be performed by qualified personnel.
Air Supply Install the valves using dry, filtered air. Lubrication is not required. If using
lubricated air, refer to the solenoid manufacturer’s specifications.
Flow Direction The valves should be installed to close against the flow to prevent hammering.
Fittings When using suitable fittings, Mix Proof valves with detachable connections can
be installed in the pipe system per the fitting requirements. The valve must be
installed free of tension. After the valve is installed in the pipe system, attach the
control air hoses and connect it to the electrical supply.
Contact WCB at 1-800-252-5200 for more information on our wide variety of
fittings for all applications.

August 2008 95-03076 Page 9
Waukesha Cherry-Burrell Installation
Pipeline Support Install adequate supports to prevent strain on the fittings, valves, and equipment
connections.
1. Install supports at least every 10 feet (3 meters) on straight runs of piping
(Figure 2, item C).
2. Install supports on both sides of the valves as close as possible to the
connections (Figure 2, item D).
3. Install supports at each change of pipeline direction (Figure 2, item E and
F).
4. For pipelines passing through walls, floors or ceilings, provide at least 1 inch
(25 mm) of clearance around the pipe to allow for expansion and
contraction. (Figure 2, item G).
Stem Flush Adapter Mix Proof valves utilize a stem flush adapter to provide a liquid or steam barrier
around the valve stem. The valves are designed for 14.5 psi (1 bar) maximum
flush pressure with 1/4" (6.35 mm) tube OD connections.
WARNING: Milk and milk products are to be flushed from the piping
system and isolated prior to installation of valve or optional flush line.
Installing the Valve
1. Connect the air lines to Port A. Switch the controls to open condition
(pressurize connection 3). See Figure 3.
2. Using caution, lift the actuator assembly and set the actuator in the body
assembly.
3. Lower the valve slowly into the body, making sure the lower stem enters the
lower bearing carrier.
4. Tightly clamp the yoke/body flange.
5. Connect the air lines to 1 and 2 (Figure 3).
6. Connect the electrical control cord to the valve. See publication 95-03083
for details.
7. Operate the valve through the four conditions (closed, open, upper seat
cleaning, and lower seat cleaning). See “Solenoid Valve Port Connections”
on page 11.
Figure 2 - Pipeline Support
Figure 3 - Solenoid Valve Port Connections

Installation Waukesha Cherry-Burrell
Page 10 95-03076 August 2008
Connecting Flush Supply
Line (Optional)
Connect the cavity cleaning supply to a suitable water supply to flush the vent/
drain (Figure 4) during operation of the processing system.
The flush supply line can be connected to a pipe system by 1/4" (6 mm) rigid or
flexible poly tubing.
Connect the supply line to the adapter connection with flexible poly tubing
(Figure 4).
WARNING: During valve opening and CIP cleaning, fluid escapes from
the drain port. Drain off to prevent possible hazard to personnel.
Regulate the flush supply for pressures of 30 psi minimum, 50 psi maximum.
Maximum solution temperature is 180°F (60°C).
WARNING: The cavity cleaning operation must fall within the fail-safe
control system. See “Cleaning” on page 15.
For PMO applications, consult the PMO for suitable water requirements.
WARNING: PMO requires pasteurized water for water flushing in
pasteurized product applications.
WARNING: Take proper precautions to safeguard the flush water
supply, such as installing backflow prevention devices.
Figure 4 - Connection of Flush Supply

August 2008 95-03076 Page 11
Waukesha Cherry-Burrell Operation
Operation All functions of mix proof valves are pneumatically controlled using a 72 to 100
psi (4.9 to 6.9 bar) clean air supply.
The valve contains a large and small spring in the valve actuator. The springs
hold the valve seats in the closed position.
Large Spring
• Located in the top air chamber of the cylinder.
• Holds the upper plug in closed position.
Small Spring
• Located in the extended hub of the upper piston.
• When the valve is open, the spring only acts on the upper seat stem to hold
the upper and lower plugs together.
• When the valve is closed, the spring holds the lower plug in closed position.
Solenoid Valve Port
Connections
Typically three air supplies controlled by solenoid valves supply air to the valve
actuator (Figure 5).
The air supply must be 72 to 100 psi (4.9 to 6.9 bar).
ON = Solenoid energized (OPEN).
OFF = Solenoid de-energized (CLOSED).
Solenoids are normally closed.
Air connections are 1/8" NPT.
Figure 6 - Location of Solenoids
Table 1: Solenoid/Valve Position
Condition Solenoid
312
Closed OFF OFF OFF
Open OFF ON OFF
Upper Seat
Cleaning OFF OFF ON
Lower Seat
Cleaning ON OFF OFF
Figure 5 - Solenoid Valve Port Connections

Operation Waukesha Cherry-Burrell
Page 12 95-03076 August 2008
Automatic Fail-Safe System
Table 2: Valve Stem Detection Conditions
Condition Upper Switch
(NO)
Lower Switch
(NC)
Yoke Switch
(NC)
Switch Symbol
Valve Closed 0 1 1
Valve Open 1 0 0
Valve Closed with
Upper Seat Lift 0 1 0
Valve Closed with
Lower Seat Lift 0 0 1
1 = Energized; LED is lit 0 = De-energized; LED is off
Upper Switch – Sends input signal when valve is properly open.
Lower Switch – Sends input signal when valve is properly closed.
Yoke Switch – Sends input signal when upper seat is properly closed.
The valve seats are part of an automatic fail-safe system preventing
contamination of product with cleaning or sanitizing solutions. Automatic fail-
safe systems are unique to each particular installation. Typically, both blocking
valve seats are properly seated in blocked position before the mechanical
cleaning system can be activated for the cleaning circuit containing the valve
arrangement. W75RS PMO valves are spring-to-closed fail-safe into the blocked
position. Waukesha Cherry-Burrell does not offer control systems, only the PMO
double seat valve. To determine the integrity of fail-safe control interlocks, see
“Positive Fail-Safe Detection Test” on page 14.

August 2008 95-03076 Page 13
Waukesha Cherry-Burrell Operation
Valve Operating Conditions See Figure 5 on page 11 for port and corresponding chambers.
Valve Open
The valve is open when Chamber 1 is
pressurized and Chambers 3 and 2
are vented. See Figure 7.
Valve Closed
The valve is closed when Chambers
3, 1, and 2 are vented. Large spring
closes the valve to fail-safe position.
See Figure 8.
Figure 7 - Valve Open Figure 8 - Valve Closed
Valve Closed, Upper Seat
Lifted
For cleaning the upper seat on seat
lifting models only. Chamber 2 is
pressurized, and Chambers 3 and 1
are vented. See Figure 9.
Valve Closed, Lower Seat
Push
For cleaning the lower seat. Chamber
3 is pressurized, and Chambers 1 and
2 are vented. See Figure 10.
Figure 9 - Valve Closed, Upper Seat
Lifted
Figure 10 - Lower Seat Lowering

Operation Waukesha Cherry-Burrell
Page 14 95-03076 August 2008
Test Procedures Stem Gauge
First confirm the proper location of the lower valve stem. Place a test gauge
(Figure 11, item A) as shown on the lower shoulder of the stem. The shoulder
should line up with the gauge.
Corrective Action: Check the stem assembly, ensuring that the lower stem is
fully turned in.
Confirm the yoke area proximity switch location for detection of upper stem
movement within 1/16". Insert a test gauge sideways between the detection cap
and the switch with the valve in the closed position.
The proximity switch (Figure 12, item C) should contact the gauge (item D, part
number 121672), without compressing the detection cap (item E).
Corrective Action: Loosen the proximity switch bolt and adjust the position.
Positive Fail-Safe Detection Test
Perform a test to verify the fully closed fail-safe position. Both the upper and
lower valve plugs are position-detectable via proximity switches. The valve plug
feedback proximity switches are to be set for the fully opened and fully closed
positions of the valve. See Figure 5 on page 11 for port and corresponding
chambers. See Figure 11 and Figure 12 on page 14 to confirm the stem and
switch positions using a stem gauge.
Decommission the system, drain the lines, and lock out the pumps.
1. With the valve fully closed, confirm that the proximity switches conform to
Table 2 on page 12. Verify the switch status on the PLC control system.
2. Pressurize chamber 1 to open the valve. Confirm that the proximity switches
conform to Table 2 on page 12.
3. Vent chamber 1 to close the valve.
4. Activate the upper seat lift either through the control system or manually by
supplying air to the air port in chamber 2.
5. When the upper seat lifts, confirm that the proximity switches conform to
Table 2 on page 12. Verify the switch status on the PLC control system.
6. Vent the air in chamber 2 to deactivate the seat lift.
7. Activate the lower seat push either through the control system or manually
by supplying air to chamber 3 on the valve actuator.
8. When the lower seat is pushed, confirm that the proximity switches conform
to Table 2 on page 12. Verify the switch status on the PLC control system.
9. Vent the air in chamber 3 to deactivate the seat lift.
10. Disconnect the air from the valve actuator, placing the valve in the fail-safe
position. Verify that the proximity switches register that the valve is fully
closed.
Corrective Action
If the double seat mix proof valve fails to respond as indicated above,
immediately check the valve assembly and wiring to locate and correct the cause.
• Check the proximity switch adjustment.
• Check for the correct assembly and adjustment of the valve.
Figure 11 - Test Gauge and Stem
Alignment
Figure 12 - Proximity Switch Location

August 2008 95-03076 Page 15
Waukesha Cherry-Burrell Maintenance
Maintenance
Maintenance Intervals Maintain adequate stock of replacement parts. Maintenance intervals should be
determined by the user and specific application, based on the following condi-
tions:
• Daily operation period.
• Switching frequency.
• Application parameters, such as temperature, pressure, and flow.
• Product type.
Inspection Inspect the following on a regular basis:
DANGER: Do not put a hand into the
yoke or body of a pneumatically
actuated valve.
• Actuator connections for air leaks.
• Valve body and stem o-rings.
• Valve seats. (If leakage occurs, see “Troubleshooting” on page 67.)
• Pneumatic connections:
Air pressure at supply connection.
Air lines for kinks and leaks.
Threaded connections for tight fit.
Threaded strain relief for tight fit.
Electrical connections secure on control module.
Wire connections tight on terminal strip.
Clean air filter at regular intervals.
Lubrication No lubrication is required other than as noted in the disassembly and assembly
procedures. (Use 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 CAUTION: Avoid splashing any liquid into the air vent of the actuator
during clean up.
Cleaning-In-Place (CIP)
CIP methods can be used to clean installed automatic valves without disassem-
bly. Methods must be selected subject to specific requirements of sanitarians and
each application. Check with local chemical suppliers for the most effective
cleaning agents and procedures.
NOTE: Actuate each valve a minimum of
twice each cycle to ensure effective cleaning
and sanitizing.
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 intervals between CIP cleanings. See “Connecting Flush
Supply Line (Optional)” on page 10.
CAUTION: During valve opening and CIP cleaning, fluid escapes from
the drain port. Drain it off to prevent any possible hazard to personnel.
Connect the flush connection to a suitable water supply to flush the vent/drain
during operation of the processing system.

Maintenance Waukesha Cherry-Burrell
Page 16 95-03076 August 2008
Cleaning Solution
Mix Proof valves are designed to use a cleaning solution supplied by a CIP sys-
tem. Cleaning of the seat area should be done during CIP treatment of the upper
or lower valve housing.
When the upper or lower body is CIP, upper or lower seat lifting should occur.
Seat lifting positions are factory set and marked in the yoke area. Seat lifting will
produce visible leakage from the vent outlet. Brief multiple lifts should occur for
each step in the CIP program, excluding the initial rinse. Seat lifting is not rec-
ommended during the initial rinse if heavy soils are experienced.
WARNING: Do not clean the vent until milk and dairy products have
been removed or isolated from the valve.
• Maximum Solution Temperature: 160°F (71°C)
• Cleaning Time: dependent on inlet pressure; recommended cycle time is one
to three seconds per cleaning cycle.
Cleaning Procedure
Cleaning procedures should be established for each installation depending on
product characteristics, operating parameters (temperature, velocity, valve
cycles), product velocities, etc.
WARNING: Do not clean the vent until milk and dairy products have
been removed or isolated from the valve.
For optional external flush of the vent cavity, water flush can be activated during
the final rinse.
The valves are 3A design and intended for CIP cleaning. Consult a local cleaning
specialist regarding cleaning valves.
During CIP cleaning of the system, open and close the valve to clean all areas.
CIP flow should be from bottom to top through the valve, if possible. If the actu-
ator is a seat lifting actuator, open andclose the upper and lower seats indepen-
dently during CIP cleaning.
CAUTION: Proper cleaning solution pressure is required for proper
cleaning of the valve. The CIP pump must be energized during seat lifting.
Every few months of operation, remove and inspect one valve in the system to
ensure that complete cleaning is being achieved.

August 2008 95-03076 Page 17
Waukesha Cherry-Burrell Maintenance
Seat Lifting Adjustment Seat lifting models are factory set. A line on the stem in the yoke area provides a
visual indication of the correct adjustment. If required, adjust the seat lift to fac-
tory settings or within the adjustment zone.
NOTE: Always adjust the lower seat first. Lower seat
Operate the lower seat lift cycle. Observe the indicator stem movement at the top
of the valve or at the balancer on the bottom of the valve. The proper movement
is 0.28" (7.1 mm).
To adjust the movement of the lower seat for cleaning, use a spanner wrench to
rotate the adjusting sleeve in the yoke (Figure 13, item B): Left to increase; right
to decrease.
Upper seat
Operate the upper lift cycle once. Operate it three more times to observe the outer
stem movement by watching the adjusting nut in the yoke. The proper movement
is 0.12" (3 mm).
To adjust the movement of the upper seat, use a 1/4" pin to rotate the adjusting
nut (Figure 13, item A): Left to increase; right to decrease.
Removing Valve from System WARNING: Before removing the actuator/valve stem assembly from the
valve body, drain all product lines connected to the body.
1. Clean, rinse, and drain the pipe system elements attached to the valve.
Remove or block the fluid and gas lines to prevent material from entering the
pipe system elements attached to the valve. If present, disconnect the flush
water supply connection.
NOTE: If the valve has a control module
with solenoid, air and electric must remain
ON until the valve is properly disassembled.
2. Shut off delivery of the control air unless required for removal of the valve
stem/actuator assembly of the body.
3. Disconnect the electrical supply and lock out all power.
.4. Supply air to open the valve.
5. Remove the clamp between the yoke and adapter (Figure 14, item A).
6. Remove the air pressure to cycle the valve closed, lifting the valve approxi-
mately
3/8" (9.5 mm) out of the body.
7. Lift the complete valve actuator and stems out of the valve body.
8. Move the valve to a work station.
Figure 13 - Location of Adjusting Nut
Figure 14 - Location of Adapter Clamp

Maintenance Waukesha Cherry-Burrell
Page 18 95-03076 August 2008
Disassembly of Valve Stems The valve stems must be disassembled in order to replace the seat ring.
1. Using an open end wrench, remove the lower stem (Figure 15, item A) from
the actuator by turning it counter-clockwise.
NOTE: Before disassembly, note the position of the upper and lower seat lifting
adjustment nuts. See Figure 13 on page 17.
2. To remove the upper stem (Figure 16, item B), hold the adjusting sleeve with
the spanner wrench, turn the stem counter-clockwise, and remove it from the
actuator. If the adapter (Figure 16, item C) comes out of the yoke, handle it
with care.
A = Lower Stem
B = Upper Stem
C = Top Adapter (Bonnet)
Adapter Bearings and
O-rings
Inner O-ring and Bearing Replacement
1. Remove the valve stem assembly from the actuator and slide the adapter off
the outer stem.
2. Remove and replace the o-ring (Figure 17, item A) inside the adapter.
3. Check the split bearing (Figure 17, item B) inside the adapter by feeling the
amount protruding from the adapter wall. If the bearing is flat against the
wall, replace the bearing.
4. Place a screw driver behind the bearing and pry it away from the wall of the
adapter. A needle-nose pliers can be used to grip the bearing for removal.
Use care not to scratch or damage the metal surfaces.
NOTE: The bearing will be damaged during
removal and must be replaced with a new
bearing.
5. To install a new bearing, coil the bearing to a size smaller than the inside
diameter of the adapter and insert it into the proper location.
6. Push the actuator stem into the adapter to help properly seat the bearing.
7. Using your finger, ensure that the bearing is properly seated. Visually
inspect the seating.
Figure 15 - Valve Stem Removal
Figure 16 Stem Removal
Figure 17 - Adapter O-rings and Bearing