How Piston Works

How does a Wagner or SprayTech piston airless paint sprayer work?

On electric piston pumps, the motor is the power source. The electric motor revolves at a rate (RPM) that must be reduced before the power is transferred to the piston rod. This is accomplished through internal gear reductions. Once the speed is reduced, the motors circular motion is converted to linear motion by using the eccentric bearing and scotch yoke. The scotch yoke is connected to the piston rod forcing it up and down.

FLUID SECTION

The fluid section is where the coating is put under pressure. Once under pressure, the coating is forced through a small opening (the tip) and broken into small droplets (atomized) making the coating spray able.

• On the upstroke of the piston the paint in the upper paint chamber is compressed (pressurized). After the coating is under pressure it is discharged through the hose to the gun and forced through the tip.

• Upper ball is forced against the upper seat.

• Creating a vacuum pulling the inlet ball off the inlet seat pulling paint into the lower paint chamber.

• As the piston moves down the inlet ball is forced against the inlet seat and the outlet ball is lifted off the outlet seat.

• Coating in the lower paint chamber is forced through the piston rod into the upper paint chamber.

• Because the upper paint chamber is only half the size of the lower paint chamber pressurized paint is again discharged through the hose, gun and a tip.

• Dual acting piston - pumping paint on both the upstroke and down stroke.

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Last modified: 04/02/05

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