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Idiomas disponibles
Idiomas disponibles
1/3 HP Pump Series • MLP-20/46S
Introduction
This brochure should be read in conjunction with Catalog MLP-46 and the assembly drawings when
supplied as part of the O/M manual with a pump.
Installation
The Haskel pump can be mounted in any position and be secured by the two mounting brackets.
Alternatively, the hydraulic inlet can be directly mounted to the top of a liquid tank. However, models with
separation chamber construction (all MD, MCPV and 29723 models) should be mounted vertically so that
any fluid leakage from the chamber vent port will not migrate into the air drive section. Pump can be
mounted in a horizontal position providing the vent port is facing down. Do not pipe vent port back to fluid
source.
Air Drive System
Other gases such as Nitrogen, CO
, Natural Gas – even Sour Gas (H
S) can be used as alternatives to
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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.
However, 40 psi is the recommended minimum for long term reliable operation. The maximum air-drive
pressure is 125 psi (8.5 bar). It is not necessary or desirable to use an airline lubricator. The air drive
section of all Haskel liquid pumps are pre-lubricated at the time of assembly with Haskel lubrication
50866. The air drive requires no other means of lubrication. Install an air line filter and pressure regulator
with a minimum of 1/4" NPT port size. Also review air system upstream and eliminate any restrictions to
provide 1/4" minimum inside diameter. Install a shut-off/speed control valve, 1/4" NPT, at pump inlet port.
Hydraulic System
NOTE: Inlet fluid supply piping should not be less than 1/4" I.D. Restricting the fluid supply will result in
lower outlet flow rates and cause pump to cavitate.
Larger internal diameter piping should be used with heavy fluids or if suction head is >3 feet.
Caution: Do not loosen liquid inlet or liquid outlet fittings of pump to facilitate make up of connections.
These fittings must be tight to avoid leakage or damage. A suction filter must be installed in the liquid inlet
line. 100 x 100 mesh is normally ample to protect the pump seals and check valves.
Priming
Install a valve of suitable working pressure to the pump outlet that is capable of being used as an air
bleed to start up. Open air-control valve slowly. Allow pump to cycle for approximately fifteen seconds
pumping fluid through the valve. If adequately primed, close the valve. The pump will cycle slowly and
then stall due to increase in output resistance. If pump does not stall, open the valve and repeat the
procedure.
Operation
The pump model number indicates the ratio between the area of the air piston and the liquid piston.
The liquid outlet pressure can be controlled quite accurately by regulating the air drive pressure. The
pump will cycle rapidly initially and as it approaches an output pressure equal to the ratio times the air
drive pressure, it will gradually slow down and finally "stall".
Where it is necessary to obtain maximum outlet flow rates up to a pre-determined pressure, a Haskel Air
Pilot Switch should be installed at the pump outlet to automatically stop the pump at the final pressure.
The airline regulator should be set at 125 psi (8.6 bar). A Haskel relief valve to prevent over
pressurization should also be fitted as a safety precaution.
NOTE: A hand pump attachment can be fitted (for precision control or use without compressed air power)
on all models. (Specify with –HP)
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