Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Patent
1978-10-05
1980-02-26
Footland, Lenard A.
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
138 46, F16D 102
Patent
active
041900855
ABSTRACT:
For controlling and measuring the flow of a gas in a duct, apparatus including a collar member adapted to be sealingly connected to the duct and a plurality of overlapping throttling blades pivotally carried by mounting means situated within the collar member. These blades define the side surface of a truncated cone and have upstream end regions defining the base of the cone and downstream end regions defining the of the truncated cone as well as a throttling aperture through which the gas is adapted to flow. The blades are appropriately shaped and positioned so that one side edge region of each throttling blade overlaps and resiliently engages an adjacent side edge region of an adjacent throttling blade with a positive bearing force which results in a fluidly sealed engagement between each pair of adjacent blades so that the truncated cone defined thereby is rendered gas sealed. It is possible to adjust the inclination of the blades and, therefore, the size of the throttling aperture by adjusting the position of at least one blade which thereby transmits a pivoting force to adjoining blades. Apparatus may be operatively associated with the collar member to measure the pressure differential of the gas flow stream between a first location upstream of the truncated cone and a second location defined by the truncated cone in the vicinity of the apex thereof in order to measure the rate of gas flow.
REFERENCES:
patent: 1108128 (1914-08-01), Buffum
patent: 2934892 (1960-05-01), Hurlbert et al.
patent: 2934966 (1960-05-01), Wood
Hasa Juhani
Tolmunen Arvi
Footland Lenard A.
Halton Oy
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