Stress analysis based on action of preload and valve stem force for electric cut-off valve;

An analysis is made of the material of valve stem and valve core,which are often seen in the operation of chemical industry machinery and coal machinery and of the solder ability and other mechanical properties of the material systematically.

Analysis of discharge valve rod failure and its improvement;

Stress analysis and experimentation in stem of gate valve;

Improvement on stem sealing structure and material of slab gate valve;