Because of its excellent part load efficiency, many compressor unit is used mainly in the occasions for large displacement in high pressure piston compressor applications.
由于其出色的部分负荷效率，多压缩机机组主要应用于的场合为大排量中高压活塞式空压机应用领域。
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The coupling between bridge and track adopts by beam unit, modulus of electricity of and yielding stress according to the broken line of the non-liner rail longitudinal resistance of displacement.
On the basis of a large number of field test data, the regression of the displacement coefficient and system efficiency for pumping unit wells were established.