Shutdown pressure relief valve for common rail fuel system
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United States of America Patent
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Sep 15, 2015
Grant Date -
Nov 28, 2013
app pub date -
May 25, 2012
filing date -
May 25, 2012
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Abstract
A passive hydraulically actuated non-electric shutdown pressure relief valve relieves pressure in the high pressure volume of a low static leak common rail fuel system after shutdown. When the common rail fuel system is in operation, a transfer pump provides medium pressure to hold the shutdown pressure relief valve closed. At shutdown, the residual medium pressure downstream from the transfer pump decays back to tank, and the residual high pressure trapped in the common rail and fuel injectors pushes open the shutdown pressure relief valve to release the high pressure after back to tank.
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