33
VALVE SERVICE
The minimum pressure valve may be
purchased as an assembly if required.
Service parts are available, however, to
repair/overhaul this valve. This valve may be
serviced as follows:
1. Remove the service control piping from
the minimum pressure valve.
2. Remove the valve from the air
receiver/oil reservoir cover.
3. Clamp the valve securely in a vertical
position (cap end up) in a suitable fixture
(bench vise).
4. With a suitable wrench remove the valve
cap from the valve body.
WARNING
THE SPRING BENEATH THE CAP IS
UNDER PRESSURE. EXERCISE EXTREME
CARE WHEN REMOVING CAP TO
PREVENT IT FROM FLYING OFF.
5. Remove the spring from the body.
NOTICE
SAVE SPRING SHIM(S), WASHERS, IF
ANY, FOR REUSE.
6. Insert a suitable tool (wood stick) into
the inlet port of the valve and push the
piston and valve assembly upward and
out of the body.
7. Remove the check valve piston from
inside the larger piston. Take care not to
lose the small spring.
8. Remove the o-ring seal from the large
piston and discard the seal.
9. Thoroughly clean all remaining parts.
Visually inspect all parts for damage or
wear. Replace as required.
NOTICE
THE CHECK VALVE ASSEMBLY (ITEMS
8, 9 AND 10, FIGURE 13) IS FURNISHED
ONLY AS A COMPLETE ASSEMBLY.
CHECK THE PLASTIC (TEFLON) SEAT ON
THE VALVE ASSEMBLY CAREFULLY
FOR DAMAGE. REPLACE VALVE
ASSEMBLY AS REQUIRED.
10. Install a new o-ring on the larger piston.
11. Reassemble the small check valve
piston, with the spring, in the large
piston.
12. Lubricate the o-ring seal on the piston
with a silicone base lubricant. (Example,
Dow Corning 55M).
13. Reinstall the check valve and piston
assembly in the valve body. Take care
not to damage the o-ring seal during
installation.
14. Install the large spring in the valve body
on top of the piston. Reinstall spring
shim(s).
15. Lightly coat the cap thread with
“Locktite” 271 (or equivalent) and install
the cap (compress the spring) by
threading the cap into the valve body.
Torque the cap to 60-70 ft. Lbs.
16. Reinstall the minimum pressure valve on
the air receiver - oil reservoir cover. Use
a good grade of pipe thread sealer on all
pipe threads. Tighten securely. Do not
over tighten.
17. Reconnect the service and control piping
to the valve using pipe thread sealer on
the pipe threads. Tighten service piping
securely. Do not over tighten.
BLOW DOWN (DUMP) VALVE
The blow down (dump) valve is furnished as a
complete assembly. No service is required.
OIL SEPARATOR SERVICE
An oil separator element may be removed as
follows:
1. Remove the separator out (service)
piping separator drain piping and control
piping from the air receiver/oil reservoir
cover.
NOTICE
MARK OR TAG THE PIPING/FITTINGS TO
MAKE CERTAIN THEY WILL BE
RECONNECTED CORRECTLY.
2. Remove the receiver/reservoir cover to
flange nuts and washers. Remove the
cover.
3. Lift and remove the element from the air
receiver/oil reservoir.
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