Haskel AG Serie Instructions De Fonctionnement Et D'entretien page 3

Air Driven Gas Booster Compressor, 5-3/4" Drive AG Series • OM-3F
Introduction
The Haskel "Oil Free" gas booster compressor is an air driven, non-lubricated, reciprocating piston type
gas compressor available in single acting single stage, double acting single stage, and two stage
configurations. Individual models may also be used in series for multiple staging. The model number is
the approximate ratio of the air drive piston(s) area to the gas piston(s) area.
CAUTION: High pressure gas can be dangerous if improperly handled.
Description
General
The air drive piston(s) in all models are automatically cycled by a non-detented, unbalanced air valve
spool that is alternately pressurized and vented by the pilot air system. This drive is directly connected to
the booster section piston(s) which are designed to run dry without lubrication to supply gas free of
hydrocarbon contamination. Exhaust air from the drive is used to cool the gas barrels and in 2 stage
units, the gas intercooler. Some models depend on the cold air exhausting from the muffler slots directly
against the gas barrel (without benefit of a cooling jacket). Therefore, the position of the exhaust muffler
on these models should not be disturbed. Mufflers on models with cooling jackets may be relocated for
noise or configuration convenience.
Air Drive Section
Refer to detailed assembly drawing of the air drive section provided with each unit. The air drive
section consists of one or more air drive piston assemblies, an unbalanced spool type cycling control
valve and pilot valves (one mounted in the valve end cap and one in the opposite end cap), a flow tube to
direct drive air flow from the valve end cap to the opposite end cap, and pilot tube to connect the two pilot
valves, which are in series. The drive control valve operates without springs or detents and is cycled by
the pilot valves alternately pressurizing and venting the large area on the inside end of this spool valve.
The control valve, pilot valves and drive cylinder are lubricated with Haskel air drive grease, part no.
50866, at assembly. Occasional relube of the easily accessible control valve and pilot valves with this
grease may be needed depending on the duty cycle of the installation.
It is recommended that only o-rings and seals of proper compounds and hardness for low friction be used
in the air drive section. Haskel replacement seals are recommended.
If not otherwise installed by the factory, always install a conventional bowl type shop air filter/water
separator of the same or larger pipe size on the incoming air drive plumbing. Drain and maintain it
regularly. Do not use an airline lubricator of any kind.
Gas Section
Refer to the detailed assembly drawing on the gas section(s) provided with each unit. These
sheets cover the individual parts and their installation for the gas section of the individual models. Note
that no lubrication of any kind is ever used on the dynamic seals of the gas pumping sections.
They are designed to run dry supported on the inherent low friction properties of the seal and bearing
materials. The life of the gas section also depends on the cleanliness of the gas supply. Therefore,
micronic filtration is suggested at the gas inlet port. If compressed air or other moisture containing gas is
to be pumped, the initial dew point should be low enough to prevent saturation at booster output
pressure, and if any carry over of oil from the compressed air source is evident, special coalescing type
filtration may be necessary. Over the life of the moving parts, some migration of inert particles into the gas
output should be expected. Therefore, a small particle filter on the high pressure line may be advisable for
critical applications.
COMPRESSION RATIO-VOLUMETRIC EFFICIENCY
The compression ratio is the ratio of output pressure to gas supply pressure. (To calculate, use psi
absolute values.) The gas pumping sections are designed to have minimum unswept or clearance volume
at the end of the compression stroke. On the return (suction) stroke of the piston, output pressure in the
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