Patent ID: 6474082
Filing Date: 2002-11-05
Classification: F16K,F25B,G01P

Abstract:
A flow switch apparatus indicating whether or not fluid is flowing in said apparatus, comprising:a check valve having an inlet and an outlet, fluid pressure at said inlet being greater than pressure of said fluid at said outlet in a first mode when said valve is open to fluid flow, said valve being closed to flow in a second mode when said outlet pressure is one of equal to and greater than said inlet pressure; a signaling device for detecting whether said valve is in said first or second mode and outputting a corresponding electrical signal; a throttle device in parallel with said check valve by connection across said valve inlet and outlet, said throttle device by-passing a portion of said fluid flow in said first mode, said throttle device permitting pressure equalization at said valve inlet and outlet when said valve switches from said first mode to said second mode.