Bio-Rad BioLogic Signal Import Module (SIM) - Manual (Page 204)

3. Use the #0 Phillips (cross-head) screwdriver to remove the two screws and washers that secure
valve bodies A and B to the actuator. Set the actuator aside, taking care not to lose the spring.
4. Use your fingers to remove the plunger/diaphragm assembly from the valve body.
5. Remove the label. A new label is provided in the rebuild kit. Note that ports A and B are on one
side; the pump/common port is on the other side of valve body A. When reassembled, the new
label will not fit properly if ports A & B are not adjacent to each other.
6. Carefully separate the two valve bodies. Note the location of the O-ring.
7. Inspect the disassembled valve. Make sure there are no scratches or foreign material on the
sealing surfaces of the two valve bodies. Clean the valve bodies, if necessary, by soaking or
sonicating in a bath containing a mild detergent. Replace all required parts, if necessary.
To reassemble the valve:
1. Insert the plunger/diaphragm assembly into valve body A. Invert it and install the sealing disk onto
the plunger tip. Make sure the disk inserts into the plunger tip.
2. Install the O-ring on valve body B. Replacing the O-ring is easily done with your finger.
3. Put the two valve bodies together so that the two ports are next to each other. The two valve bodies
must lie flush against each other, with no space in between them. Place the two larger screws
(removed in step 3 above) through the valve assembly. Set this aside.
4. Set the actuator with its open end facing up.
5. Place the spring in the opening at the center of the actuator so that it fits into the deepest part of the
opening. This may take a couple of tries.
6. Place the valve body assembly onto the actuator (the orientation is not specific), then tighten the two
screws.
7. Attach the clamp to the valve body with the remaining screws.
8. Apply the valve label. Make sure that the hole in the label matches with the Pump/Common port
and does not overlap it.
11.6.2 AVR7-3 and AVR9-8 Valves
The AVR7-3 and AVR9-8 valves are disassembled and cleaned in the same way. The replaceable parts in
the valve are the rotor seal and the stator face assembly; these items are included in the AVR7-3 Rebuild kit
(catalog #760-0401) and the AVR9-8 Rebuild kit (catalog #760-0403). Indications of damage include valve
leaks and valve switching problems.
Safety Note: Before disassembling the valve, be sure to flush any hazardous material from the valve
and to disconnect it from the Workstation. Wear protective clothing, as appropriate.
To disassemble the valve, follow the procedure below:
1. With the hex key that is provided, remove the three stator screws.
2. Lift the stator body and stator face assembly from the stator ring. (The stator face assembly usually
stays with the stator body when it is lifted off.)
MAINTENANCE MAINTENANCE AND TROUBLESHOOTING
11-11