Flow rate regulation apparatus for an exhaust duct in a cylinder

Valves and valve actuation – Relatively movable valve elements form single port closure

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137486, F16K 3144

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active

061293350

ABSTRACT:
The present invention provides a flow rate regulation apparatus capable of accurately measuring the flow velocity of air flowing through an exhaust duct and carrying out a flow rate regulation with high precision, though said exhaust duct may be short in length. The flow rate regulation apparatus according to the present invention comprises a means for regulating the sectional area of a passage in an exhaust duct, where the passage is formed at the center of said exhaust duct and said passage is shaped to be symmetrical with respect to the center axis AX of said exhaust duct as a basis. Since the passage formed in the exhaust duct by the passage sectional area regulation means is shaped so as to be symmetrical, no turbulence takes place in an air current flowing along the center axis AX of the exhaust duct. Flow velocity can be accurately determined and maintained by using air velocity measurements along the center axis.

REFERENCES:
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patent: 4625627 (1986-12-01), Livanos et al.
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patent: 5986240 (1986-12-01), Schmitt et al.
Coghlan, Concentric Variable Conduction valve, IBM Technical Disclosure Bulletin vol. 21, No. 2 pp. 587-588, Jul. 1978.

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