The PowerStar™ 4 pumps develop high output pressures by applying the principle of differential areas. The pump has a large area air piston (air driven at low 5 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 in the number following the air module number (P4).
Example: 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 480 psi; 80 psi air - 370 psi output; 60 psi air - 270 psi output; and 40 psi air - 180 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.
The modular PowerStar 4 System features
- A patented design
- One common air motor module for all eight ratios
- Easy conversion to separated (non-contaminating) configuration
- A double-ended unit that provides even higher flows
- Safe operation in hazardous environments
- Automatic shut-off at set pressure
- Stainless steel wetted parts
- Easy assembly and service for air motor and high pressure modules (field assembly requires careful alignment; see Assembly & Operating Instructions)