Patents Assigned to PREVCO SUBSEA, LLC
  • Dual poppet pressure relief valve with vacuum adaptor capability
    Patent number: 12085181
    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.
    Type: Grant
    Filed: May 26, 2023
    Date of Patent: September 10, 2024
    Assignee: PREVCO Subsea, LLC
    Inventors: Don Christensen, John Head
  • Dual poppet pressure relief valve with vacuum adaptor capability
    Patent number: 11703139
    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.
    Type: Grant
    Filed: August 31, 2022
    Date of Patent: July 18, 2023
    Assignee: PREVCO Subsea LLC
    Inventors: Don Christensen, John Head
  • Dual poppet pressure relief valve with vacuum adaptor capability
    Patent number: 11473685
    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.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: October 18, 2022
    Assignee: PREVCO SUBSEA LLC
    Inventors: Don Christensen, John Head
  • High reliability pressure relief valve
    Patent number: 9732868
    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.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: August 15, 2017
    Assignee: PREVCO SUBSEA, LLC
    Inventors: John Bertoldi, Joseph Schimek, III, John Head
  • High Reliability Pressure Relief Valve
    Publication number: 20140360590
    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.
    Type: Application
    Filed: April 8, 2014
    Publication date: December 11, 2014
    Applicant: PREVCO SUBSEA, LLC
    Inventors: John Bertoldi, Joseph Schimek, III, John Head