Ostrolenk, Faber, Gerb & Soffen, LLP
Pressure relief valve
The present invention provides a pressure relief valve, which achieves a reliable sealed structure in a valve holder 31 without the valve holder 31 jutting far out from a common rail, assures stability of operation of a valve spring 11 in a valve holder 31, and is capable of being manufactured at low cost and can be made compact. A first invention relates to a pressure relief valve, which focuses on making the low-pressure portion side end portion of a valve holder 31 a closed structure, and which has a valve spring 11 that is housed inside the valve holder 31; spring seats 34, 35 on which a valve spring 11 is seated; a valve seat 32 that is mounted to the valve holder 31; and a valve body 9, which is lifted from the valve seat 32 by fluid pressure, this pressure relief valve being characterized in that there is formed a closed end portion 36, which makes the low-pressure portion side end portion 31B of the valve holder 31 a closed state, and, in addition, is constituted so as to enable a valve spring 11 to be seated between the inner wall surface of closed end portion 36 and a spring seat 34, 35. A second invention focuses on making the spring seats 34, 35 of valve spring 11 a cup shape, and is characterized in that spring seats 34, 35 are housed in a slidable condition inside a valve holder 31 as cup-shaped spring seats 34, 35. 
Bosch Automotive Systems Corporation
Y Y F
Y10T Y10T F16K
additional additional inventional
Kazumasa Takeo Hideya Etsuro Akinori
Kasahara Kushida Kikuchi Hozumi Yamazaki