| 摘要 |
A fluid pump having a pusher with a push wall defining a push outside surface and an inside surface; and a peripheral skirt which extends from the inside surface of the push wall. A pump chamber is provided with an inlet valve and with an outlet valve, a dispensing orifice via which the fluid is dispensed, a main piston, and a differential piston that is mounted to move in the pump chamber in response to variation in the pressure. The differential piston is mounted to move away from the push wall when the pressure increases in the pump chamber; the pusher and the differential piston being mounted to move along an actuating axis that extends substantially perpendicularly to the push wall. The differential piston is formed integrally with an inlet valve moving member that co-operates with an inlet valve seat.
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