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FLUID FLOW INDICATOR WITH AUTOMATIC ALARM TIMER FOR HIGH PRESSURE/LOW FLOW APPLICATIONS

  • US 20090167540A1
  • Filed: 10/21/2008
  • Published: 07/02/2009
  • Est. Priority Date: 12/29/2007
  • Status: Active Grant
First Claim
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1. A fluid flow switch for detecting exceptionally low rates of fluid flow, comprising:

  • (a) a housing having an inlet port, an outlet port and an inner piston cylinder extending between and communicating with said inlet port and said outlet port;

    (b) a piston carried within said piston cylinder in sealed relation against an inner wall surface thereof, said piston being movable from a resting position to a switch-activating position in response to the presence of fluid flowing through said piston cylinder;

    (c) a switch operatively disposed for activation upon movement of said piston to said switch-activating position;

    (d) a vent hole extending through said piston to facilitate controlled dissipation of fluid through said piston and the return of said piston to said resting position upon a stoppage of fluid flowing through said piston cylinder; and

    (e) a piston biasing member carried within said piston cylinder for urging said piston toward said resting position upon a stoppage of fluid flowing through said piston cylinder.

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