Dual poppet pressure relief valve with vacuum adaptor capability
AssigneePREVCO Subsea LLC
InventorsDon CHRISTENSEN, John Head
Life of this patent
Estimating the term…
Abstract
A pressure relief valve is disclosed with a first stage valve that is in series with a second stage valve, with an enclosed cavity between the first stage valve and the second stage valve. The first stage valve relieves pressure from an enclosure into the enclosed cavity between the stages, when the pressure is above a cracking pressure of the first stage valve. The second stage relieves pressure from the enclosed cavity when the pressure is above the cracking pressure of the second stage valve.
Claims23
1-11. (canceled)
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;
- a first stage valve carried within the interior cavity;
- a second stage valve comprising an enlarged head carried within the opening and a shaft extending from said enlarged head within the passageway to the interior cavity;
- and
- a coupling member coupling said first stage valve to said shaft.
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 an orifice extending between the interior cavity and an exterior of said housing;
- a first stage valve carried within the interior cavity to sealably engage adjacent portions of said house within the interior cavity to restrict fluid communication between the interior cavity and the orifice;
- a second stage valve comprising an enlarged head carried within the opening and a shaft extending from said enlarged head within the passageway to the interior cavity, said enlarged head to sealably engage adjacent portions of said housing within the opening to restrict fluid communication between the opening and the passageway;
- a coupling member coupling said first stage valve to said shaft;
- and
- at least one biasing member between said enlarged head and said first stage valve.
A method of making a pressure relief valve (PRV) assembly comprising:
- positioning a first stage valve within the interior cavity of a housing having an opening therein and a passageway extending between the opening and the interior cavity;
- positioning a second stage valve within the opening, the second stage valve comprising an enlarged head within the opening and a shaft extending from the enlarged head within the passageway to the interior cavity;
- and
- coupling, via a coupling member the first stage valve to the shaft.
Dependencies are inferred from the claim text.