| 摘要 |
A pumping apparatus is provided, which comprises a piston ( 1 ) for reciprocation in a pump working chamber ( 3 ), a valve, coupled to said pump working chamber ( 3 ) in order to permit liquid flow only unidirectional and a drive unit for reciprocating said piston ( 1 ). The liquid in said pump working chamber ( 3 ) is compressed to a high pressure, at which compressibility of the liquid becomes noticeable. The piston ( 1 ) is at least partially coated with a diamond-like carbon coating ( 2 ), adapted to provide a reduced abrasion of said piston ( 1 ).
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