| 摘要 |
A piston pump dispenser having a reciprocating piston pump arrangement in which in a dispensing stroke in which fluid is pressurized in a chamber (18) to dispense fluid, a piston slide member (120) is urged into a sealing disc of a piston sleeve member (100) to increase the extent to which the sealing disc provides a seal with a wall of the chamber against fluid leaking out past the seal disc. |
