US 12,480,589 B2
Pressure relief valve assembly including series coupled valves and related methods
John Head, Fountain Hills, AZ (US); James French, Chandler, AZ (US); and Don Christensen, Fountain Hills, AZ (US)
Assigned to PREVCO Subsea LLC, Fountain Hills, AZ (US)
Filed by PREVCO Subsea LLC, Fountain Hills, AZ (US)
Filed on Jul. 26, 2024, as Appl. No. 18/786,377.
Application 18/786,377 is a continuation in part of application No. 18/202,882, filed on May 26, 2023, granted, now 12,085,181.
Application 18/202,882 is a continuation of application No. 17/900,204, filed on Aug. 31, 2022, granted, now 11,703,139, issued on Jul. 18, 2023.
Application 17/900,204 is a continuation of application No. 16/744,133, filed on Jan. 15, 2020, granted, now 11,473,685, issued on Oct. 18, 2022.
Claims priority of provisional application 62/792,739, filed on Jan. 15, 2019.
Prior Publication US 2024/0384806 A1, Nov. 21, 2024
Int. Cl. F16K 17/06 (2006.01); F16K 15/06 (2006.01); F16K 17/04 (2006.01); F16K 17/10 (2006.01)
CPC F16K 17/044 (2013.01) [F16K 15/066 (2013.01); F16K 17/06 (2013.01); F16K 17/10 (2013.01); Y10T 137/0486 (2015.04); Y10T 137/0491 (2015.04); Y10T 137/7743 (2015.04); Y10T 137/7838 (2015.04); Y10T 137/7846 (2015.04)] 23 Claims
OG exemplary drawing
 
1. A pressure relief valve (PRV) assembly comprising:
a housing having an opening therein, an interior cavity, a passageway extending between the opening and the interior cavity, and a flange extending within the passageway adjacent the opening;
a first stage valve carried within the interior cavity;
a second stage valve fluidly coupled in series with the first stage valve and comprising an enlarged head carried within the opening and a shaft extending from the enlarged head through the passageway to the interior cavity, the shaft having a proximal end coupled to the enlarged head and an opposing enlarged distal end adjacent the interior cavity; and
a biasing member between the enlarged distal end of the shaft and the flange and configured to bias the first and second stage valves to a closed position.