| 摘要 |
A valve operating mechanism for use in a fluid dispenser is described, wherein the fluid dispenser includes a reservoir for a fluid to be delivered, and an fluid outlet for the reservoir, and a piston configured to move through the reservoir, and an actuator for the piston, the valve operating mechanism including a valve, wherein the valve has an upstream side and a downstream side, and characterised in that in at least one point of operation of the valve operating mechanism, the valve is inoperable as a consequence of the pressure difference between the upstream side of the valve and the downstream side of the valve. Other embodiments of a valve operating mechanism, and methods of their use, are also described. |
