pre-inlet valve

When water-filled, pre-fill the gas tank for water, and then placing a sealed -- open valve.

充水时, 预先给换气罐加满水, 然后加 盖密封,再开启换气阀.

Conclusion Enough pre-operative preparation, MVR with preservation of valve and subvalvular structure, correct selection of artificial valves and enhancing post-operative treatment can significantly improve the results of valve replacement for the patients with severe valvular heart disease.

结论充分术前准备、保留瓣下结构、人工瓣膜合理的选择和匹配及加强术后处理是提高重症心脏瓣膜病疗效的重要措施。

A principle that a pre-impact can improve the structural integrity of the safety valve seat was proposed.

据此，提出采用预冲击改善安全阀阀座结构完整性的设想和原则。

When heat tempera-ture exceeds the highest temperature pre-set, temperature control instrument con-trol relay close to open water control electromagnetic valve for cooling treatment.

当加热温度超过预先设定的最高温度值时，通过温控仪控制继电器的闭合打开水路控制电磁阀进行冷却降温处理。

The author achieved the hardware circuit design and system algorithm design, using stepper motor to adjust the oil rod and pre-stroke sleeve, using the proportional solenoid valve to control EGR valve.

本文针对常柴4L88系列柴油机，采用步进电机控制油量调节齿杆和预行程滑套、比例电磁阀控制EGR阀门的方案，完成了控制系统的硬件电路和控制软件的设计。