Too often, some processes in natural gas production require sub-atmospheric pressure. The so-called vacuum pump is a general term for a type of mechanical equipment that can obtain an absolute pressure lower than atmospheric pressure.

Divided from the structure, there are many types of vacuum pumps. The brief introductions of several common in production are as follows.
(1) Reciprocating vacuum pump
The working principle and structure of the reciprocating vacuum pump are similar to those of the reciprocating compressor, but the valve used is lighter and the clearance is smaller, generally single-stage, and the suction gas pressure is much lower than the local atmospheric pressure at that time. The reciprocating vacuum pump is dry. The code name of the reciprocating vacuum pump is W, and there are five main specifications and models from W1 to W5, which have been widely used.

(2) Jet pump
The jet pump uses the fluid flow, the static pressure energy is converted into kinetic energy to transport the fluid. It can be used to suck liquid and also can be used to suck gas. It is often used in the production of evaporation and rectification to generate vacuum, so it is also called Jet vacuum pump.

(3) Water ring vacuum pump
The water ring vacuum pump is a wet vacuum pump, which can obtain a vacuum degree of 85%. The structure of the pump is simple and compact, there is no valve, and it can be connected with a motor. The domestic water ring vacuum pump series code is sz. This type of vacuum pump is often used to pump air and non-corrosive, water-insoluble and solid particles-free gases. .