Flow-controlled control switch,particularly for pri mary circuits in heating systems

摘要

A flow-controlled valve and switch has a valve body made of two mutually sealingly connected parts (2, 3); a valve element (4), which is movably fitted within the valve body and can throttle, in a controlled manner, the flow of fluid which passes through the valve body; a return spring (5) for the valve element (4); a valve element motion transmission lever (6) which extends through a wall of the valve body, where it is pivoted, so as to affect the valve element (4) and be actuated thereby; a seal such as an O-ring (7) between the lever and the valve body wall; and a microswitch (8) located outside the valve body and actuatable by the transmission lever (6). Extensive flow (in the direction of arrow A) opens the valve and actuates the switch. The device is particularly suited for use in heating circuits, where it prevents heating until there is sufficient flow. IMAGE