Other gases such as Nitrogen, CO
2
, Natural Gas – even Sour Gas H
2
S can be used as alternatives to
compressed air when properly modified. Consult the factory for additional information.
The air drive requires a minimum pressure of 25 psi (1
.72 bar) to actuate the air
cycling valve spool. The
maximum air drive pressure rating is 150 psi* (10 bar)
. It is not necessary or desirable to use an airline
lubricator. The air drive section of all Haskel liquid pu
mps are pre-lubricated at the time of assembly with
Haskel lubricant 50866. The air driv
e requires no other means of lubricat
ion. Install an air line filter and
pressure regulator with a minimum of 1/2” NPT port
size. Also review air system upstream and eliminate
any restrictions to provide 1/2” mi
nimum inside diameter. Install a shut
-off/speed control valve, 1/2” NPT,
at pump inlet port. Install one 1/2” NPT exhaust muffl
er, p/n 21701, to the exhaust port in the bottom cap
to suppress the noise and prevent entry of contaminat
ion into the air valve assembly. See “Air Controls”
in MLP-46 Catalog for typical layout. The A, H, and XH series include pumps with double and triple air
heads as well as the standard single air head. Extra air heads are used to increase the intensification
ratio without any loss of flow rate. A double air head is identified by a 2 as the last digit in the ratio number
and a triple air head by a 3, (e.g. HF-202, DSXHF-903
