Bio-Rad BioLogic Signal Import Module (SIM) - Manual (Page 203)

11.6 VALVES
The following sections discuss the procedures for cleaning and repair of the SVT3-2, AVR7-3 and AVR9-8
valves.
11.6.1 SVT3-2 Diverter Valve
The SVT3-2 can be disassembled for cleaning or to replace parts which may become damaged over time.
Indications of damage include valve leaks and valve switching problems. Items labeled in bold in Figure 11-7
are included in the SVT3-2 Valve Rebuild kit, catalog #760-0411. You will need a #1 Phillips (cross-head)
screwdriver and a #0 Phillips (cross-head) screwdriver.
Note: These parts are rather small. Be sure you are working on a clean tabletop with room to lay out
these parts and that your hands are clean.
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. Remove the large screw that attaches the clamp to the rack.
2. Use the #1 Phillips (cross-head) screwdriver to remove the two screws that attach the clamp to the
valve. Set the clamp and screws aside.
Figure 11-7. SVT3-2 Valve Assembly
DISK
PLUNGER
AND DIAPHRAGM
SCREWS (2)
VALVE BODY B
O-RING
SPRING
ACTUATOR
SCREWS (2)
RACK CLAMP
VALVE BODY A
PORT A
(MUST LINE
UP WITH
PORT B)
PORT B
(MUST LINE
UP WITH
PORT A)
MAINTENANCE MAINTENANCE AND TROUBLESHOOTING
11-10