Throttle valve

Details Throttle valve Throttle valve

F - Mech Eng,Light,Heat,Weapons

02

M

123/88

F02M 19/00 (2006.01) F02D 9/10 (2006.01) F16K 1/22 (2006.01)

Patent

CA 1188939

ABSTRACT _ In a fluid control throttling valve for varying the throttling cross sectional area of flow as a function of shaft angle ? , the cross section varying according to the relation Aa = b1 (Kl - Cos.THETA.) where K ?1, where b1 is a constant of proportion, the valve comprises a smoothly con- vergent surface directly upstream of the throttling cross sectional area and a downstream cusp face curving so as to stabilize a parasitic entrained vortex so that the merger of the convergent flow past the throttling cross sectional area with the downstream entrained vortex produces a substantially constant vena contracta area and thus a constant coefficient of discharge over the relevant operating March and Reynolds number range, of the throttling valve.

412230

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