High accuracy low leakage valve for high pressure applications

摘要

A high pressure valve assembly ( 10 ) comprising a valve sleeve ( 14 ) and a valve body ( 16 ) slidably mounted in the valve sleeve ( 14 ) is disclosed, the valve body ( 16 ) and valve sleeve ( 14 ) each having first ends ( 18, 56 ) and second ends ( 20, 58 ). A sidewall ( 22 ) extends between the valve sleeve first end ( 18 ) and second end ( 20 ) which sidewall ( 22 ) has an inner surface ( 24 ) and an outer surface ( 26 ) and at least one opening ( 30 ) therethrough. The sidewall ( 22 ) also includes at least one channel ( 40 ) having a first end ( 42 ) facing the inner surface ( 24 ) at a first location closer to the first valve sleeve end ( 18 ) than to the second valve sleeve end ( 20 ) and a second end ( 44 ) facing the inner surface ( 24 ) at a second location closer to the second valve sleeve end ( 20 ) than to the first valve sleeve end ( 18 ). A method of using the valve assembly ( 10 ) is also disclosed.