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US 11,473,685 B2Granted
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.
Claims5
A dual poppet pressure relief valve (PRV) comprising:
- an internal poppet valve;
- an external poppet valve;
- a coupling between the internal poppet valve and the external poppet valve, the coupling comprising:
- a pin extending through a bore in the internal poppet valve and extending through a bore in the external poppet valve;
- an external spring which biases the external poppet into a closed position;
- and
- an internal spring which biases the internal poppet into a closed position wherein the pin is retained within the bore within one or more windings of the internal spring.
4 more elements
Dependencies are inferred from the claim text.