Outlet pressure and flow are normally controlled by adjusting valve clearance and it causes considerable energy waste. Frequency control of motor speed is a method of solving the problem.

常规的通过调节阀门开启度来达到调节注水泵出口压力和流量的作法，会使很大一部分能量造成浪费，要解决这个问题，可以采取对注水泵进行调速的方法。

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The opening degree of the thermo-mechanic expanding valve is controlled by the over-heating degree of the refrigerant at the outlet of the evaporator.

热力膨胀阀的开度受控于蒸发器出口的制冷剂过热度，通过开度的调节，达到调节蒸发压力和控制制冷剂过热度的作用；

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