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Chapter 4 Maintenance Series 830/840/860 Instruction Manual
4-8 IM-83/84/86-H
Valve Maintenance
Electromagnetic valves may require spring-tension adjustments for
various reasons (See Valve Adjust Procedure). No maintenance is
required under normal operating conditions other than an occa-
sional cleaning. Use of certain corrosive gases may require fre-
quent replacement of the valve plug and O-rings. This indicates a
need for a different elastomer. Viton is standard, with Neoprene,
Kal-Rez (or equivalent), and PFA Teflon offered as options.
Do not attempt any valve adjustments while the meter is “on-line”
with any dangerous gas. All controllers should be thoroughly leak-
tested following any valve adjustment.
For the Model 860 Auto-Trak, refer to “Piston Tube Calibration
Procedure” for instructions on how to re-adjust the electromagnetic
valve for proper operation.
Electromagnetic Valves - Low and Medium Flow Controllers
Controllers with a low or medium flow body use the same valve;
high flow models use a larger version. Cleaning can often be ac-
complished by opening the valve, using the purge function and
flushing in both directions. Alternatively, the valve may be manu-
ally opened by loosening the 6-32 lock nut on top of the valve and
turning the adjustment screw fully counterclockwise.
To disassemble the low and medium flow valve for inspection:
1. Remove the unit from the system.
2. Remove the two 4-40 Phillips head screws on top of the enclo-
sure. Remove the enclosure by sliding it up and off. Remove
the metal cap on top of the valve by inserting a flat tip screw-
driver into the slots provided and prying upward.
3. Use a 5/8 inch nut driver to loosen and remove the 5/8 inch
nut at the top of the valve. Remove the coil, coil enclosure and
warp washer.
Caution!
When using toxic or cor-
rosive gases, purge the
unit thoroughly with inert
dry gas before discon-
necting from the gas line.