Causes of inlet tempering quick open valve s long term leakage are discaused in the text,and corresponding solutions to them are also given in the text.

By comparison and analysis of O-type ball valve and direct single seat quick opening valve,the new concept of using direct single seat quick opening valve in substitution of O-type ball valve is given;on the other hand,the calculation and choice of model of direct single seat quick opening valve are elaborated.

In the process of rolling, sometimes the gap quick open because the strip is broken or other reasons, in this case and increase the use of the roll and decrease the productivity.

Development of a Quick-opening Seal Construction for Supercritical Fluid High-pressure Extraction Equipment;

At the same time,the intensity and fatigue are analyzed for the quick closure structure of the high pressure welding of underwater testing chamber by ANSYS software.