如果圆圈内有两个三角形，表示能够换向。
If in the circle has two triangles, indicated that can commutate.
另一种是为气压泵设计的机动自动换向机构，该机构是利用渐开线(零度压力角)凸轮机构作为换向机构。
The other is a mechanical automatic reversing mechanism designed for atmospheric pumps, which adopts involute (zero pressure Angle) CAM mechanism as reversing mechanism.
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