One-way valve and metering pump

Abstract

The invention relates to a check valve and a metering pump. The check valve comprises a valve body, a valve plate, a liquid discharge cavity, a liquid inlet cavity, an inner cavity, a first valve membrane used for isolating the liquid discharge cavity from the inner cavity and a second valve membrane used for isolating the liquid inlet cavity from the inner cavity. The first valve membrane and the second valve membrane are both arranged between the valve plate and the valve body. The first valve membrane and the second valve membrane are identical in structure and are both made from stainless steel plates and rubber sheets. The rubber sheets are symmetrically arranged on the two sides of the corresponding stainless steel plate, and the stainless steel plate is further provided with penetrating overflow grooves. Steel part rigid sealing in check valves at an inlet and an outlet of an original metering pump is changed into rubber material flexible sealing, and accordingly the situation that leakage is caused by abrasion of sealing parts or precision of the pump is influenced due to the fact that the sealing face is filled with solid particles is avoided; and meanwhile, the metering pump using the designed check valve does not need the specific mounting direction.

Description

technical field [0001] The invention relates to the field of valves, in particular to a check valve and a metering pump. Background technique [0002] At present, the inlet and outlet check valves of metering pumps usually use self-weight ball valves or spring-type ball valves. This type of check valve mainly includes valve balls, valve seats, and springs (the self-weight type has no springs). Mature, but they do have many shortcomings: 1. The valve ball and the valve seat are hard seals, which have extremely high requirements on the hardness and toughness of the material of the valve seat, otherwise it is easy to cause leakage due to valve seat wear, which will affect the accuracy of the pump; 2. If the liquid conveyed by the metering pump contains solid particles, the filling of the solid particles into the sealing surface will affect the sealing performance of the valve. Therefore, two ball valves are usually installed at the inlet and outlet of the pump, which increases ...

AI Technical Summary

Problems solved by technology

[0002] At present, the inlet and outlet check valves of metering pumps usually use self-weight ball valves or spring-type ball valves. This type of check valve mainly includes valve balls, valve seats, and springs (the self-weight type has no springs). Mature, but they do have many shortcomings: 1. The valve ball and the valve seat are hard seals, which have extremely high requirements on the hardness and toughness of the material of the valve seat, otherwise it is easy to cause leakage due to valve seat wear, which will affect the accuracy of the pump; 2. If the liquid conveyed by the metering pump contains solid particles, the filling of the solid particles into the sealing surface will affect the sealing performance of the valve. Therefore, two ball valves are usually installed at the inlet and outlet of the pump, which increases the cost and the overall size of the pump; 3. The ball valve must be installed vertically up and down, which limits the installation direction of the metering pump

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