CPC F16K 17/044 (2013.01) [F16K 15/066 (2013.01); F16K 17/06 (2013.01); F16K 17/10 (2013.01); Y10T 137/7743 (2015.04); Y10T 137/7838 (2015.04); Y10T 137/7846 (2015.04)] | 22 Claims |
1. A pressure relief valve (PRV) assembly comprising:
a housing having an opening therein, an interior cavity, and a passageway extending between the opening and the interior cavity, the housing having a flange extending into the passageway adjacent the opening;
a first stage valve carried within the interior cavity;
a second stage valve coupled to and fluidly in series with said first stage valve, said second stage valve comprising
an enlarged head carried within the opening,
a threaded shaft extending from said enlarged head within the passageway, and
a nut threadably engaging said threaded shaft; and
a biasing member seated against said nut and said flange, said biasing member biasing the first and second stage valves to a closed position.
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