Patent ID: 6755205
Filing Date: 2004-06-29
Classification: F15B,F15C,Y10T

Abstract:
A method of stabilizing a flapper valve having at least one of a liquid and gas flowing between a high pressure source and a low pressure drain, the flapper valve having at least one variable flow restrictor for modulating at least one of an intermediate output flow and an intermediate pressure, the at least one variable flow restrictor in series with at least one flow restrictor, an effector means for varying flow through the variable flow restrictor, the effector means influenced by a force from at least one of an output flow and an output pressure, the effector means prone to oscillate at least one frequency range, the method comprising the step of:adding at least one flow passage in series with the at least one variable flow restrictor and the at least one flow restrictor, the at least one flow passage being sufficiently long and narrow that the dynamic behavior of the at least one flow passage is dominated by fluid inertia in the at least one frequency range.