| 摘要 |
<p>The piston pump has a pump casing (5) containing two annular grinding bands (3,17), pump piston (1) and piston return spring (16), suction valve (4) and a pressure valve (7). The suction side of pump piston is limited by liquid supply chamber (19), while the discharge side of the pump piston is limited by the pumping chamber (9). The pump piston is provided with a localized cross-section reducing portion which is extended within the liquid supply chamber. The cross-section reducing portion is formed as transverse bore or longitudinal bore.</p> |
