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US 4,059,984 AGranted
Fluid leak detector
AssigneeInternational Telephone and Telegraph Corporation
InventorWilliam J. Uhlarik
Life of this patent
Estimating the term…
Abstract
A fluid circuit wherein the cooling coil flow resistance of a furnace and the flow resistance of a needle valve are balanced against those of two orifices to determine cooling coil leakage.
Claims8
A fluid flow detector, said detector comprising:
- first, second, third and fourth conduits;
- an inlet;
- an outlet, said first and second conduits being connected in succession from said inlet to said outlet, one of said first and second conduits having an adjustable valve, said third and fourth conduits being connected in succession from said inlet to said outlet, each of said third and fourth conduits including a constriction to the flow of fluid therethrough such that the flow through said third and fourth conduits is substantially smaller than that through said first and second conduits;
- a differential pressure unit (DPU);
- a fifth conduit connected from between said first and second conduits to said DPU;
- a sixth conduit connected from between said third and fourth conduits to said DPU;
- and means connected from said DPU to indicate the difference between the pressures within said fifth and sixth conduits, said indicator means being actuated when the other of said first and second conduits is leaking.
4 more elements
Dependencies are inferred from the claim text.