Multiple piston pressure intensifier for a safety valve
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United States of America Patent
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Jul 5, 2016
Grant Date -
Nov 5, 2015
app pub date -
Sep 25, 2013
filing date -
Sep 25, 2013
priority date (Note) -
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Abstract
Disclosed are subsurface safety valves having multiple pistons used to increase the opening force. One safety valve includes a housing having a piston bore defined therein and configured to receive hydraulic fluid pressure, the piston bore providing an upper bore having a first diameter and a lower bore having a second diameter smaller than the first diameter, a piston assembly movably arranged within the piston bore and comprising an upper piston arranged in and configured to sealingly engage the upper bore and a lower piston arranged in and configured to sealingly engage the lower bore, and a connecting rod coupling the upper and lower pistons, wherein a cavity is defined between the upper and lower pistons within the piston bore and the piston rod extends within the cavity.
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