Piston Filling Machine: Features, Working Principle & Applications

A piston filling machine is a widely used liquid filling equipment designed for accurate volumetric dosing. It operates through the reciprocating motion of a piston, ensuring precise filling. This machine is ideal for industries such as food & beverage, cosmetics, pharmaceuticals, and chemicals.

Main Features

1. High Filling Accuracy

Utilizes piston-based volumetric control; volume can be adjusted by changing piston stroke. Filling accuracy typically within ±0.5%, suitable for high-value or pharmaceutical products.

2. Wide Liquid Compatibility

Capable of handling liquids with various viscosities, including water, oil, creams, pastes, and suspensions. Some models can also fill liquids containing particles.

3. Modular Design

Customizable filling heads (from single to multi-head) allow simultaneous filling of multiple containers, enhancing productivity.

4. Hygienic Construction

Product-contact parts are usually made of SUS304/316 stainless steel or food-grade plastic, complying with GMP and FDA standards.

5. Automation Ready

Can be integrated with conveyors, capping machines, and labeling systems for a fully automated production line.

Working Principle

1. Suction Phase

The piston retracts, creating a vacuum in the cylinder, drawing liquid into the dosing chamber via the inlet valve.

2. Dispensing Phase

The piston pushes forward, closing the inlet valve and opening the outlet valve, dispensing the measured liquid into the container.

3. Adjustable Volume

Filling volume is controlled by adjusting the piston stroke or using cylinders of different diameters.