BasicLINE: Piston pumps: Piston pumps

The hydraulic piston is designed as a differential piston and moves upwards and downwards in the working cylinder of the hydraulic part. During the upward lift, the ball of the suction valve rises and the fluid to be transported is sucked into the lower room of the working cylinder. At the same time, the ball of the pressure valve in the piston is pressed onto its seat and the liquid is displaced from the upper ring space of the working cylinder into the pressure line. The ball of the suction valve is now pressed onto its seat during the downward stroke, the ball of the pressure valve rises. The piston displaces the medium from the lower space of the working cylinder half into the upper, and the other half into the pressure line.

The piston rod of the piston engine is connected to the pump piston and transmits its movement in a straight line. The piston movement is generated by reciprocal impact of the air engine piston with compressed air and controlled by a four-way air valve. As long as compressed air is introduced into the control part via the pressure reducer valve, the thrust piston engine continues to operate until the pump has built up a sufficient hydraulic pressure in the pressure line that keeps balance with the thrust of the incoming compressed air. After that, the pump remains at rest until, for example, the hydraulic pressure starts to drop due to the removal of the gun. Now the device continues to pump and also maintains the dynamic balance between air pressure and hydraulic pressure.

The selected nozzle size and the adjusted spray pressure determine the stroke frequency (strains per minute) and the air consumption, thus also determining the respective spray performance of the pump. All pump parts that come into contact with the conveying medium are made of high quality stainless steel.