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

Operating Principle

Plunger metering pumps directly吸入 and 排出 working medium through the reciprocating motion of the plunger. As the plunger moves inward, the chamber's volume decreases, and the liquid is pushed out of the pump body; when the plunger moves outward, the chamber's volume increases, and the liquid is吸入 into the pump body. By continuously repeating this reciprocating motion, plunger pumps can continuously deliver liquids.

Features

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

‌Applicable Medium: Suitable for high viscosity mediums; not applicable for conveying corrosive slurries and hazardous chemicals._‌

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

Material: Stainless steel and PTFE materials are used for direct contact parts, suitable for general granular, odorless and tasteless mediums.

‌Application Fields: Widely used in the 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 turbine worm 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: valveless and valve-type pumps. Valve-type pumps control the fluid's entry and exit through the opening and closing of valves, while valveless pumps rely on their unique internal design to meter and transport fluids.