英语语法分析

These diaphragms prevent leakage along the valve stem.

这些横膈膜防止了沿着阀杆的泄漏。

In addition, the recognized principles of stiffening by diaphragms and improved framing to provide continuity were specified.

此时还明确规定了采用隔板加固和改善结构以保证连合的公认原则。

At this point the upper stem has lost contact with the diaphragms. The valve should be opened to this point but not back seated.

在此时，上阀杆已经失去了同横膈膜的接触。阀门应该开启到这一点，但不能反向固定。