Electromagnetic magnet valve selection of products should pay attention to several basic parameters, such as mode of operation, to adapt to the fluid medium, the electromagnetic magnet valve material requirements, temperature etc.. The basic parameters of the solenoid magnet valve products can be different according to the following description references, when a user selection according to the following data: 1, type: 2, 3, 4, 5 pass. Electromagnetic magnet valve a few pass there are several different interests and different pipeline system is connected with the interface of the magnet valve body. For example, there are three oil crossing is three through 2, mode of operation: normally open, normally closed type, general type. This is based on the electromagnetic copper check valve of the pipeline opening time to judge, if the pipeline electromagnetic magnet valve need long time to open, you can choose to use the normally open solenoid magnet valve, and the choice of a normally closed solenoid gas safety burner valve. 3, the fluid medium: air, water, oil, steam. This is a solenoid magnet valve solenoid magnet valve products according to different choice of different transmission media. 4, the material requirements: brass, stainless steel, aluminum, plastic. According to the electromagnetic magnet valve and the durability and the service life of the material selection. 5, the size requirements of pipe diameter, diameter, flow coefficient. This is based on the flow electromagnetic magnet valve selection under working condition.