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Repairing and maintaining the valves
June 2023
If you are overhauling a six-port valve, refer to drawing #CE-22260.
Procedure
1. Shut off the carrier and sample gas streams entering the unit.
2. Disconnect tubing and fittings that attach to the valve from other locations.
3. Loosen the valve's torque bolt.
4. Holding the lower piston plate, pull the valve straight off the block.
5. Remove and discard the old valve diaphragms and gaskets.
6. Clean the sealing surface as required using a non-lint-forming cloth and isopropyl
7. Replace the old diaphragms and gaskets, in the same order, with the new ones
8. Reassemble the valve using the following steps:
112
WARNING
Burns
To prevent burns, do not touch any of the hot parts. All parts of an analyzer are
always hot unless it has been switched off and allowed to cool down.
Before fitting, removing, or performing any maintenance on the analyzer, make
sure that it has been switched off and allowed to cool for at least two hours.
When handling the analyzer, always use suitable protective gloves.
These precautions are particularly important when working at heights.
If burned, seek medical treatment immediately.
See Drawing CE-22260.
The alignment pins may stick slightly.
alcohol. Blow the sealing surface with clean, dry instrument air or carrier gas.
NOTICE
Dirt, including dust and lint, can cause troublesome leakage.
Do not use an oil-based cleaner on the valve.
supplied.
a) Align the pins with holes in the block and push the valve assembly into place.
b) Tighten the valve's torque bolt.
The six-port valve requires 20 ft-lb of torque.
c) Reinstall the valve using the two mounting screws and reconnect all fittings
and tubing.
Manual
MS-00809-0100-0470
Emerson.com
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