Patent ID: 9140380
Filing Date: 2015-09-22
Classification: F16K,Y10T

Abstract:
1. A valve assembly comprising: a first energy dissipating means with a plurality of apertures for reducing the pressure of a fluid from a first pressure to a second lower pressure; a second energy dissipating means with a plurality of apertures for reducing the fluid pressure from the second pressure to a third pressure lower than the second pressure; and a valve closing means for opening and closing the valve assembly; wherein the valve closing means is configured to continuously or gradually occlude the plurality of apertures of the first energy dissipating means when closing the valve assembly, wherein at least one of the apertures of the first energy dissipating means is shaped such that a width in a lower part of the at least one aperture is smaller than a width in an upper part of the at least one aperture, such that, when closing the valve assembly, movement of the valve closing means in uniform increments results in non-uniform reductions in open passage area of the at least one aperture at least for a predetermined movement range of the valve closing means, and wherein the at least one aperture is configured such that the at least one aperture remains partially open when the valve assembly is closed.