Water flow detection device

摘要

The present invention realizes a new actuated valve type water flow detection device that can be applied to a pipe with a relatively large bore diameter. The water flow detection device A includes a coil spring for urging a detection rod in an opening direction of a valve body. Therefore, while detecting water flow by linking a rotation of the detection rod 11 to a rotation of the valve body when the valve body opens or closes by a differential pressure, the detection rod does not apply a closing load to the valve body that is released. Therefore, even when the rotation of the valve body is small because the water flow in the secondary side is small in a conventional actuated valve type water flow detection device, it is possible to increase an opening angle of the valve body.

主权项

1. A water flow detection device, comprising:
a cylindrical main body connected to a pipe of a fire extinguishing system; a valve body having a check valve structure provided inside the main body; a switch device for detecting water flow by a rotation of the valve body and outputting a predetermined signal; a detection rod having one end and an other end in a longitudinal direction, the other end protruding to the outside of the main body, the one end being provided inside of the main body and in contact with a portion of the valve body inside the main body, the portion being opposite to a bearing of the valve body and rotating in an opening direction, the other end switching ON/OFF of the switch device when the valve body rotates in the opening direction; and an urging member for biasing the other end of the detection rod to urge the one end of the detection rod in the opening direction of the valve body.