【机械工程】电子管刺激

决定阀门操作的力主要有三种：推力，扭矩和边缘拉力。

heart valve

by-pass check valve (free-wheeled check valve)

quick exhaust valve【油气】;rapid escape valve【动力】

adjustment of valve clearance

spring loaded valve

Starr-Edwards heart valve prosthesis

shutdown valve

spring reducing valve