切换阀(强制阀)是安装在切换式换热器(或蓄冷器)热端的气动开关阀，利用连杆结构原理实现阀板的启闭。
三通切换阀“卡死”。
QH型切换阀是两个弹簧式安全阀并联，具有同一进口。
The QH type safety valves are composed of two spring loaded safety valves paralleling. There is only one inlet.
设计的切换阀可使试样及空气定量注入，并能准确间隔试样带。
A new valve is designed to inject the sample and the bubbles into the carrier stream quantitatively.
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