Flowing medium speed measuring device for use in measuring arrangement for measuring flow speed of coolant in fuel element of nuclear reactor, has piston supported by pressure difference only in active direction of dynamic pressure

摘要

The device (1) has a partial chamber (10) pressurized with dynamic pressure (ps) of a flowing medium (K) through a channel (37). Static pressure (p0) is obtained in another partial chamber (12) through another channel (52). A piston (6) is axially displaced in a direction of force, which is exerted from the flowing medium, against an effect of a spring (24). A position of the piston is a measure for pressure difference obtained between the two partial chambers. The piston is displaceably supported by the pressure difference only in an active direction of the dynamic pressure.