Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 4 - LUBRICATION AND VENTING
1. Start up the compressor and bring up to normal operating pressure. After the
operating pressures have stabilized, with all balance valves backed off (zero
spring load), note the highest gauge pressure reached in a complete block
cycle.
2 Slowly increase the spring load on one balance valve, being careful to not
exceed rupture disc rated pressure. Watch the gauge and if the maximum pressure
increases, reduce the spring load until the highest pressure falls to the
pressure noted in step 1, above. Tighten the lock nut against the cap, hand
wrench tight.
3 Repeat step 2, for the remaining valve(s).
Maintain the system by recording the pressures and cycle times of the lubrication system at
least once a day.
Checking/Adjusting Balance Valves on Subsequent Start-up
Ensure that all fittings are tight and any known leaks have been fixed. Purge the force feed
system.
Start the compressor and bring up to normal operating pressure. After the operating pressures
have stabilized, check the pressure gauges to ensure the system is still balanced. If
one or more line pressures are out of balance, wait for 2 to 3 hours to see if they become
balanced. DO NOT adjust the balancing valves immediately. It is possible that some lube
points will increase in injection pressure after a short period of run time and the system will
become balanced if it is not balanced on start up.
If a balance valve(s) was installed, but is not required, leave (or set) the spring adjustment at
zero. If back-pressure on an unused balance valve is high enough, it may eventually begin
to leak oil. In this case, replace the balance valve internal assembly with a plug assembly,
Ariel Part Number A-10330. DO NOT RUN UNIT WITH LEAKY BALANCE VALVES. A valve
seal repair kit, Ariel Part Number A-8005-K, is available.
Maintain the system by recording the pressures and cycle times of the lubrication system at
least once a day. Readjust valves as required to keep pump systems pressure balanced for
best results.
Frame Lubricating System - Description
The frame lubricating system supplies oil to the internal frame running gear. The cylinders
are supplied with lubrication by the force feed system (see “Force Feed Lubrication System
- Description” on page 4-11). An oil level regulator outside the crankcase should be used to
maintain the proper oil level in the sump.
Frame lubrication is drawn from the sump through the suction strainer into the oil pump that
is mounted on the crankcase auxiliary end cover. The pump's discharge is piped to an oil
cooler mounted on the compressor skid and is temperature controlled with a thermostatic
control valve. Oil returns from the cooler to the oil filter mounted on the auxiliary end of the
crankcase. Pressure gauges are provided on the filter inlet and outlet. Normal pressure drop
thru a clean filter is 2 to 6 PSI (15 to 40 kPa), at normal operating temperature.
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