Fluid level alarm and control device

Claim 1

An audible alarm device for detecting and signalling the advent of a leakage condition in a fluid storage tank, comprising: a source of dry nitrogen gas under pressure; gas operated audible means external of said storage tank; pneumatic valve means mounted internally of said storage tank including pneumatic pressure line interconnecting opposite sides of said valve means with said source and said audible means, respectively; float means mounted internally of said storage tank, interconnected with said valve means, and responsive to predetermined fluid levels representing the advent of a leakage condition in said storage tank to actuate said valve means to transmit gas from said source through said pneumatic lines to sound said audible means, said float means in said tank being mounted for slidable movement on vertical rod means in response to varying fluid levels in said tank; an operating plunger for said valve means; lever means pivotally mounted at a first end thereof adjacent said valve mans and having reel means mounted on a second end thereof, said lever means being constrained to engage and depress said plunger when pivoted downwardly about said first end; disc means mounted for vertical movement on said rod below said float and being adapted to engage said float in response to said second fluid level corresponding to a leakage condition; and cable means connecting said disc means to said reel means on said second end of said lever means.