Fuel pressure regulation valve
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United States of America Patent
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Jun 17, 2008
Grant Date -
Apr 13, 2006
app pub date -
Oct 11, 2005
filing date -
Oct 13, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A regulation valve has: a cylinder that has an inlet port at one end side thereof to introduce the fuel thereinto, and a relief port opening on a side face thereof; a piston that is reciprocatably inserted in the cylinder to vary an opening area of the relief port in accordance with a variation of the pressure of the fuel flowing in through the inlet port; and a spring that urges the piston in a direction against the pressure of the fuel acting on the piston to regulate the pressure to be a specific value. Further, the cylinder and/or the piston is formed so that the piston opens the relief port at a relatively small speed per a unit displacement thereof in starting opening the relief port and subsequently at a relatively large speed.
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