检测设备有光学投影仪、拉、压、扭力测试仪，检测结果由测试仪自动打印。
Optical projector, tension tester, pressure tester and torsiometer are the testing instruments. Testing results can be typed automatically.
他们能也是依于剪和压曲的行动和在例外情况对扭力。
They too can be subject to both shear and bucking action and in isolated cases to torsion.
止回阀应该采用一个扭力弹簧结构，以将通过总成的压降减到最小。
The check valves shall utilize a single torsion spring design to minimize pressure drop through the assembly.
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