1. Adopt integral jacket structure design, more evenly heat preservation, cold preservation.

2. The diameter of the valve is the same as that of the pipe. The medium flows in a straight line and the resistance is small. It can effectively reduce the heat loss of the medium in the pipeline.

3. It has excellent properties for liquid media which are easy to solidify and have high viscosity.

4. Simple structure, small size and light weight.

5. It is reliable and reliable, and has been widely used in vacuum system.