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Piston Fillers

Piston fillers are some of the oldest, simplest and best known volumetric fillers with easy design and accurate output. Piston filling systems can be designed to handle a range of products and viscosities. The Piston Filler usually consists of a piston, cylinders, valves and associated circuitry to control flow of product into and the out of the cylinders. Most piston pumps form tight seal between piston and cylinder but this is not strictly necessary. The principal of the operation of the piston pump filler is to increase and decrease the volume of the cylinder in a controlled manner.

 

When the cycle starts, the piston is at the top of the cylinder with negligible internal free space. The cycle begins by pulling the piston gradually out of the cylinder. Some designs hold the piston stationary and moves the cylinder instead of the piston. At the start of the cycle, the valve on the inlet side of the cylinder is opened and the valve on the discharge side of the cylinder is closed. This allows product to be drawn from the product reservoir into the cylinder. When the piston reaches the end of its stroke, the cylinder contains the amount of product to be filled. The inlet valve is then closed and then the discharge valve is opened. The piston is then pushed back into the cylinder forcing the product out of the nozzle to the container. The piston & stroke is usually adjusted to cover range of product volumes.

 

Double acting Piston pumps:-

A double-acting piston pump has got product chamber on both sides of the pump allowing it to dispense two doses of product per cycle. As the piston is moving in, discharging one dose of the product, the chamber behind the piston is filling with another dose of the product. At the end of discharge the 2 way valve changes the position and the first discharge side start acting as the suction side and the previous cycle & suction side start acting as the discharge side. So, the double acting piston filler is able to dispense product while sucking the product from the other side. To operate this system, the product must be pressurized by a pump or pressurized product reservoir. This system is quite useful for sensitive or dangerous products."

 

Piston fillers are some of the oldest, simplest and best known volumetric fillers with easy design and accurate output. Piston filling systems can be designed to handle a range of products and viscosities. The Piston Filler usually consists of a piston, cylinders, valves and associated circuitry to control flow of product into and the out of the cylinders. Most piston pumps form tight seal between piston and cylinder but this is not strictly necessary. The principal of the operation of the piston pump filler is to increase and decrease the volume of the cylinder in a controlled manner.

When the cycle starts, the piston is at the top of the cylinder with negligible internal free space. The cycle begins by pulling the piston gradually out of the cylinder. Some designs hold the piston stationary and moves the cylinder instead of the piston. At the start of the cycle, the valve on the inlet side of the cylinder is opened and the valve on the discharge side of the cylinder is closed. This allows product to be drawn from the product reservoir into the cylinder. When the piston reaches the end of its stroke, the cylinder contains the amount of product to be filled. The inlet valve is then closed and then the discharge valve is opened. The piston is then pushed back into the cylinder forcing the product out of the nozzle to the container. The piston’s stroke is usually adjusted to cover range of product volumes.

Double acting Piston pumps:

A double-acting piston pump has got product chamber on both sides of the pump allowing it to dispense two doses of product per cycle. As the piston is moving in, discharging one dose of the product, the chamber behind the piston is filling with another dose of the product. At the end of discharge the 2 way valve changes the position and the first discharge side start acting as the suction side and the previous cycle’s suction side start acting as the discharge side. So, the double acting piston filler is able to dispense product while sucking the product from the other side. To operate this system, the product must be pressurized by a pump or pressurized product reservoir. This system is quite useful for sensitive or dangerous products.

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