Device i.e. flow monitor, for monitoring and/or measuring flow rate of medium i.e. liquid medium, has releasing unit releasing annular gap for liquid medium from flow rate exceeding predetermined threshold value

摘要

The device has a piston (7) axially shiftable against force of a return spring (9) in a housing inner area (3). The piston has a sharp-edged borehole (15) that forms a flow path, where liquid medium flows through the path. A releasing unit releases an annular gap for the medium from the flow rate exceeding a predetermined threshold value. The annular gap is formed between a piston circumferential surface and a housing inner surface limiting the inner area. Permanent magnets (10) are provided at the piston, and a sensor device (17) is provided at a housing (2).