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<8. Maintenance>
8-5
IM 12F4A1-01E
8.7.2
Valve Sheet Replacement
Perform replacement work in the following procedure:
(1) Remove the metering pump with the mounting plate.
First, press [PUMP] key to stop metering pump operation.
Next, disconnect the tubing connected to the sample water metering pump delivery joint and
the tubing connected to the reagent metering pump suction and delivery joints. Loosen six
screws fixing the plate.
When disconnecting tubing, take measures to prevent reagent from flowing out of the
reagent tank.
(2) Remove the metering pump from the plate.
First remove the “Bellofram” in according with subsection 8.7.1. Next disconnect the tubings
connected to the pump and then loosen four screws located at the rear of the plate.
(3) Remove the valve assembly.
Turn the valve assembly counterclockwise. (It is crowed into the pump main body using a
special tool (accessory)).
Special tool
Valve assembly
Shaft
Spring support
Spring
Screw
Valve sheet presser foot
Valve sheet
F8.4.ai
Figure 8.4
Valve Sheet Construction and How to Remove It
(4) Remove the used valve sheet from the shaft and properly fit a new valve sheet to the shaft.
Mount the valve sheet so that its flange is not forced out from the valve sheet pressing foot
groove.
(5) Fully screw the valve assembly into the pump main body.
(6) Incorporate the metering pump to the pump mounting plate and then mount this plate to the
case. When installing, confirm that the drain hole of the metering pump is underneath.
(7) Remount the metering pump parts such as “Bellofram” removed in step (2).
(8) Reconnect once disconnected tubings as before.
(9) Cause reagent to flow out of the reagent tank. Press [PUMP] key to actuate the metering
pump and confirm that pump operation is normal.
8.8
Metering Pump Delivery Flow Rate
Confirmation and Adjustment
When the “Bellofram” or the valve sheet is replaced, confirm the metering pump delivery flow rate
in principle. Confirm the flow rate according to the procedure described in subsection 4.3.5 and
4.3.6. If the flow rate is outside the specified range, adjust the flow rate by changing the position
of the stopper located in the pump driving assembly.
14th Edition : Jul. 15, 2020
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