Patent ID: 6874531

Claim:
A pressure relief valve comprising: a valve body ( 10 ) having a relief fluid passage ( 5 ); a valve element ( 7 ) adapted to open and close said relief fluid passage ( 5 ), wherein said valve element ( 7 ) is disposed between an inlet port ( 2 ) in direct communication with an upstream-side fluid passage ( 1 ) and an outlet port ( 4 ) in direct communication with a downstream-side fluid passage ( 3 ), said valve element ( 7 ) having a flange portion ( 8 ) on an upper portion thereof; wherein said upstream-side fluid passage and said downstream-side fluid passage are coaxial; an annular member ( 9 ) engaged to said valve body ( 10 ); a sleeve-like bellows ( 6 ) having a lower end portion fixed on said flange portion ( 8 ) of said valve element ( 7 ) and an upper end portion fixed on an edge of a central opening through said annular member; and said annular member located above an upper surface of said valve body ( 10 ) and extending over both said inlet port ( 2 ) and said outlet port ( 4 ).