A plunger metering pump is a special volumetric pump designed to meet the stringent requirements of various process flows, primarily used for transferring liquids, especially corrosive ones.

Operating Principle

Piston metering pumps draw in and expel the working medium directly through the reciprocating motion of the piston. As the piston moves inward, the chamber's volume decreases, pushing the liquid out of the pump; when the piston moves outward, the chamber's volume increases, allowing liquid to be drawn into the pump. By continuously repeating this reciprocating action, the piston pump can continuously transfer liquid.

Features

Flow Regulation: Flow can be infinitely adjusted between 0-99%, maintaining a constant flow rate irrespective of the discharge pressure.

‌Applicable Medium: Suitable for high viscosity mediums, but not for conveying corrosive slurry and hazardous chemicals._‌

Accuracy and Pressure: Measurement accuracy up to ±1%, pressure up to 350 MPa; flow rate remains nearly unchanged during pressure changes at the outlet.

Material: Stainless steel and Teflon are used for parts in direct contact with the medium, suitable for general granular, odorless and tasteless media.

‌Application Fields: Widely used in petrochemical, food, and other industrial sectors._

Structural composition

The plunger metering pump is mainly composed of three parts: the motor, the transmission box, and the cylinder body. The transmission box components include the worm gear mechanism, stroke adjustment mechanism, and crank linkage mechanism; the cylinder body components include the pump head, suction valve assembly, discharge valve assembly, plunger, and stuffing box gasket.

Common Types

Plunger metering pumps come in two main types: valve-equipped pumps and valveless pumps. Valve-equipped pumps control the flow of fluids in and out by opening and closing valves, whereas valveless pumps rely on their unique internal design to meter and transport fluids.