Applying
the priciple of differential areas
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 high pressures.
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.
Examples:
- 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).
- 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.
For more information, CLICK HERE to check out the on-line
catalog. (requires Adobe Acrobat Reader)
For more information call 440-
838-7690 or email EPD@EPD.curtisswright.com
Questions, comments and suggestions can
be directed to webmaster@curtisswright.com
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