Control valve assembly
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United States of America Patent
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Feb 27, 2018
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app pub date -
Mar 19, 2015
filing date -
Oct 27, 2011
priority date (Note) -
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Abstract
Embodiments of the invention provide a control valve assembly that includes a piston slidably seated within a valve chamber and moveable between multiple positions to adjust a flow rate of fluid through the control valve assembly. The piston comprises flow zones and seal surfaces to define variable flow rates related to the position of the piston within the valve chamber and to selectively seal with the valve chamber.
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