Fluid dosing device with a throttle point includes a metal bellows sealing a region around the leadthrough element of a needle valve passing through a chamber

摘要

A fluid dosing device for supplying a fluid under pressure having a chamber (35) in a housing (3), which is supplied with a pressurized fluid via fluid supply piping (17, 19). A valve needle (9) passes through the chamber (35) and has a first end portion which may be lifted to a piston and a second end section forming a valve connected to chamber (35), in conjunction with a valve seat disposed on the housing (3). A metal bellows provides a leadthrough element for the first end section of the valve needle (9). The bellows provides a tight seal in the region of the leadthrough element. A throttlepoint (37, 39) is located between the valve needle (9) and the inner wall of the chamber between a metal bellows (33) and the mouth (18) of the liquid supply line (17) leading into the chamber.