A single-head needle valve metering pump

Abstract

This utility model relates to the field of metering pump technology, and in particular to a single-head needle valve metering pump. It includes a metering pump body, which is equipped with an inlet / outlet needle valve switching mechanism for switching the inlet and outlet liquid flow channels. The switching mechanism includes a base connected to the metering pump body, and an inlet needle valve and an outlet needle valve respectively disposed on the base and mutually switching between each other. The base has a T-shaped flow channel communicating with the metering pump body, the inlet needle valve, and the outlet needle valve. When liquid enters the metering pump body, the inlet needle valve is in the open state, communicating with the T-shaped flow channel; when the outlet needle valve is blocked from the T-shaped flow channel, it is in the closed state. This utility model has a simpler structure. Through the mutual switching of the inlet and outlet needle valves, a smooth switching between liquid entry and exit of the metering pump body is achieved. Furthermore, the inlet / outlet needle valve switching mechanism can withstand high pressure, has sufficient thrust, and a fast flow rate, meeting the requirements of high-pressure metering pump use and improving the reliability and stability of the metering pump.

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