A check valve is a mechanical valve that only permits water flow in one direction.
检查阀(单向阀)是一个手动阀门，这样水只能往一个方向走。
That is not as easy as it sounds, because the only control typically supplied by the machine builder is a coolant flow valve, and often that valve is not designed for accurate flow control.
这可不像听起来那么容易，因为设备制造者在这方面的唯一控制就是冷却水阀，而且这种阀控制常常涉及得不够精确。
A self-made gas flow cell is used as the IR absorption cell. The components to be analyzed can be trapped with only one fourway valve.
IR吸收池是自制的气体流通池，只用一个四通阀即可将待测组份截留在吸收池中。
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