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.
Claims22
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.
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, the housing having a flange extending into the passageway adjacent the opening, and an orifice extending between the interior cavity and an exterior of said housing;
- a first stage valve carried within the interior cavity for engaging adjacent portions of said h use housing within the interior cavity to restrict fluid communication between the interior cavity and the orifice;
- 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 for restricting fluid communication between the opening and the passageway,
- a threaded shaft extending from the enlarged head within the cavity, and
- a nut threadably engaging said threads;
- a coupling member coupling said first stage valve to said 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.
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, the housing having a flange extending into the passageway adjacent the opening;
- positioning a second stage valve fluidly in series with the first stage valve, within the opening, the second stage valve comprising an enlarged head within the opening, a threaded shaft extending from the enlarged head into the passageway, and a nut threadably engaging the threaded shaft;
- and
- positioning a biasing member seated against the nut and the flange, the biasing member biasing the first and second stage valves to a closed position.
Dependencies are inferred from the claim text.