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Cleaning and Servicing the Selector Valve
If the sample Selector Valve becomes contaminated, you will need to clean and
lubricate it. If contamination occurs regularly, use a gas filter to prevent contami-
nation. See "Filtering Out Liquids" and "Gas Filter" in Chapter 2 for information.
Cleaning the Selector Valve
To clean the Selector Valve (see Figure 4-1):
1. Remove the screw at the center of the valve cover and withdraw the screw,
2. Remove all of the old grease and other contaminants from the surface and
3. Lubricate the faces of the cover and body with silicone-based grease.
4. Replace all parts.
Figure 4-1.
Selector Valve, Gravitometer.
Polishing the Valve
If the valve cover or valve body become scored, you will have to lap/polish the
mating surfaces to eliminate the scoring.
1. Clean both surfaces and then apply a fine valve grinding compound to
2. Loosen the detent spring that engages the "0", "LG, " and "HG"notches on
3. Rotate the cover on the valve body repeatedly beyond its normal operat-
4. After the lapping/polishing operation, thoroughly clean, lubricate, and
PN RI-212, Rev. L
both washers, the spring and cover.
channels in the cover and valve body.
Selector Valve
them. Reassemble the valve.
the cover.
ing range until the scoring is removed.
reassemble all of the parts.
Maintenance and Troubleshooting | 4-13
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