US 11,703,139 B2
Dual poppet pressure relief valve with vacuum adaptor capability
Don Christensen, Phoenix, AZ (US); and John Head, Fountain Hills, AZ (US)
Assigned to PREVCO Subsea LLC, Fountain Hills, AZ (US)
Filed by PREVCO Subsea LLC, Fountain Hills, AZ (US)
Filed on Aug. 31, 2022, as Appl. No. 17/900,204.
Application 17/900,204 is a continuation of application No. 16/744,133, filed on Jan. 15, 2020, granted, now 11,473,685.
Claims priority of provisional application 62/792,739, filed on Jan. 15, 2019.
Prior Publication US 2022/0412476 A1, Dec. 29, 2022
Int. Cl. F16K 17/04 (2006.01); F16K 17/06 (2006.01); F16K 17/10 (2006.01); F16K 15/06 (2006.01)
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
OG exemplary drawing
 
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.