With the advanced electrolysis technology to remove the burrs,the inner surface of the valve comes to be very smooth, and it is also a big support for ensuring the life cycles of GPT valves when using the Japanese seals.64 pcs valve bodies are machined simultaneously by completely computer controlled CNC machines at one time, coils are tested under 20,000 voltage equipent, and armatures are well provided by 3-D CNC machines imported form Japan, all these details make GPT to be the top in China.