| 摘要 |
A plunger pump for Bingham fluid, in particular a UV-curable ink, is designed to minimise mechanical stress in the ink during its flow from an inlet (9) at an axial end of a cylinder (8), through a non-return ball inlet valve (11, 12, 16) and a gap (13) between the plunger (4) and the cylinder (8), to an outlet (14). The gap (13) is closed at one end by sealing means (7) comprised of two channel-form sealing rings (17) and (18), the space between which communicates via a recycling outlet (27) with a reservoir for the Bingham fluid.
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