| 摘要 |
<p>A flow indicator comprising a housing having a chamber therein and including inlet and outlet openings communicating with opposite ends of the chamber. A flexible flap hingedly connected to the housing for flexure within the chamber in response to fluid flow through the chamber is visible through a transparent observation port to provide direct indication of fluid flow. A magnet carried by the flap actuates at least one magnetically responsive switch mounted in the housing and adapted for connection in an external circuit to alter the condition of the circuit in response to at least one predetermined flow condition. The flap also functions as a check valve to prevent retrograde fluid flow through the housing.</p> |
