Patent ID: 9328835
Filing Date: 2016-05-03
CPC Classification: F16K

Claim Text:
1. A piston for a valve comprising: a cylindrical body surrounding a center axis and defined by an overall length extending from an upstream end to a downstream end, wherein the cylindrical body has a piston bore configured to receive a spring assembly, and wherein the cylindrical body has a maximum outer diameter that comprises a closure sleeve contact surface, and wherein the cylindrical body is defined by a first length that extends from the maximum outer diameter at the upstream end to the maximum outer diameter at the downstream end, the first length being less than the overall length, and wherein a ratio of the first length to the maximum outer diameter is between 1.0 and 1.2, and wherein the cylindrical body includes first and second outer surface portions that are axially spaced apart from each other and which are both defined by the maximum outer diameter, and includes an undercut portion providing a central outer surface portion that is between the first and second outer surface portions, the undercut portion being defined by an undercut outer diameter, and wherein a ratio of the undercut outer diameter to the maximum outer diameter is between 0.8 and 1.0.