How the pump works
The PowerStar 4 pumps develop
high output pressures by applying the principle of differential
areas. The pump is a large area
air piston (air-driven at low 10 to 100 psi pressures). This air
piston drives a small area liquid piston that pumps liquids to
The liquid output pressure is determined by the ratio
between the area of the air drive piston, the area of the liquid
drive piston and the applied driving air pressure. The relationship
of the area of the air piston to the liquid piston is referred to
as the pump ratio which is indicated by the number following the
air module number (P4).
The P45 pump has a nominal ratio of 5 to 1 or
5 psi liquid pressure for each 1 psi of operating air pressure.
In operation, the P45 pump using 100 psi of
input air pressure could produce a maximum liquid output of 520
psi; 80 psi air - 416 psi output; 60 psi air - 312 psi output; and
40 psi air - 208 psi output. Output pressures will vary and be reduced
by 5 to 10% through internal friction depending on the lubricity
of the liquid.
By regulating the incoming air supply at the
pressure regulator, the liquid output can be infinitely adjusted
through the pump's pressure range.
Solid lines indicate approximate flows at various
driving air pressures. Dotted lines indicate air consumption.
1. With 100 psi (6.8 bar) driving air, the
pump will consume 50 SCFM (1l41 NM3/MIN) at
an operating pressure of 1,000 psi (68 bar) and will produce an
outlet flow of 358 Cu.In./Min. (5.9 LPM).
2. If the volume of compressed air is reduced to
20 SCFM (.57 NM3/MIN), the flow will be reduced
to 225 Cu.In./Min. (15.3 Liters). Shaded area indicated flow reduction.
Most air compressors will produce 4 to 5 SCFM
of compressed air per horsepower at 100 psi.
All air-driven pumps will operate on low air volumes
as long as the supply of air is sufficient to overcome minor internal
leakage and operate the air selector valve.
Performance charts are based upon air supply pumping
potable water with flooded suction. Contact Flow
Products, Inc. at 800-631-2029 for more info.