Rotate knob to full-closed and back to full-open to test for free rotation.
将旋钮旋转到全闭的位置，然后旋回到全开的位置，测试是否旋转灵活。
2
Impurity pump mechanical seal after static test, the operation of high-speed rotation of the centrifugal force generated will inhibit the leakage of media.
杂质泵用机械密封经过静试后，运转时高速旋转发生的离心力，会克制介质的泄露。
3
This paper presents the methods of free flight spin test and rotation balance test in vertical wind tunnel, the design of test model is briefly expounded.