Theoretically the sum of the velocities of the three pistons on the discharge stroke in a low-fluctuation triplex pump should be a constant, and this can be achieved by means of the cam mechanism.
对于三缸低波动往复泵，理论上应使三个活塞在排出行程（吸入行程）中的速度之和为一常数，采用凸轮机构能达到这一目的。
Each CAM must revolve once during the four-stroke cycle to open a valve.
在四行程循环时，每凸轮必须旋转打开一阀门。
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