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.
Claims25
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 said first stage valve and comprising an enlarged head carried within the opening, a shaft extending from said enlarged head through the passageway to the interior cavity, and a nut carried by said shaft;
- and
- a biasing member between said nut and said flange for biasing said 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, 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 said first stage valve and comprising an enlarged head carried within the opening and a shaft extending from said enlarged head through the passageway to the interior cavity, and a nut carried by said shaft ;
- a coupling member coupling said first stage valve to said second stage valve;
- a first biasing member between said nut and said flange for biasing said first and second stage valves to a closed position;
- and
- a second biasing member between said first biasing member and said first stage valve.
A method of making a pressure relief valve (PRV) assembly comprising:
- positioning a first valve within an interior cavity of a housing having an opening therein, a passageway extending between the opening and the interior cavity, and a flange extending within the passageway adjacent the opening;
- positioning a second stage valve fluidly in series with the first stage valve, the second stage valve comprising an enlarged head carried within the opening and a shaft extending from the enlarged head through the passageway to the interior cavity, and a nut carried by the shaft;
- and
- positioning a biasing member between the nut and the flange for biasing the first and second stage valves to a closed position.
Dependencies are inferred from the claim text.