Method of and valve for controlling flow in a hydronic system

Details Method of and valve for controlling flow in a hydronic system Method of and valve for controlling flow in a hydronic system

1994-03-29

1995-12-05

Nilson, Robert G.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

73201, 7386165, 137557, F16K 3700

Patent

active

054720141

ABSTRACT:
Liquid flow through a conduit in a branch of a hydronic system provided with a balancing valve and, in series therewith, a metering valve to obtain a desired rate of flow in the branch is regulated by positioning immediately adjacent an accelerated-flow zone in the metering valve in the conduit a pitot having an upstream side directed upstream against a direction of flow through the conduit and a downstream side directed downstream in the flow direction. The metering valve is settable in a plurality of predetermined positions each corresponding to a respective flow cross section through the conduit. A differential pressure meter is connected to both sides of the pitot, the one of the predetermined valve positions is selected that gives a near full-range reading on the meter, and the metering valve is set in this selected one position. The pressure-differential reading on the meter is monitored and the balancing valve is adjusted to regulate flow therethrough until the read pressure corresponds to a level itself corresponding to the desired rate of flow in the branch.

REFERENCES:
patent: Re34403 (1993-10-01), Arai
patent: 3640307 (1972-02-01), Drzala
patent: 4903649 (1990-02-01), Staerzl
Bell & Gossett ITT; "A Great Idea Just Got Better"; IT-8021; 1 page (undated).
Mid-West Instrument; Delta Tube; Bulletin No. DT-GPB/91; 2 pages (undated).

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