Emergency isolation valve control design
AssigneeSaudi Arabian Oil Company
InventorsYousef H. Mubarak, Manoj Chetia, Elmer S. Castillo
Life of this patent
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Abstract
A control system includes a pneumatic actuator having a spring that is compressible by a gas and connected to the isolation valve, wherein the gas is supplied to the pneumatic actuator along a gas flow path, a solenoid valve operable between an open position and a closed position, wherein the open position permits the gas to flow along the gas flow path to the pneumatic actuator, a partial stroke test device configured to perform partial stroking of the isolation valve upon reception of a signal from a computer by sending the gas to the pneumatic actuator through a needle valve, and a universal operation hand operated valve configured to send the gas to the solenoid valve or to the partial stroke test device.
Claims19
A control system for an isolation valve, the control system comprising:
- a pneumatic actuator having a spring that is compressible by a gas and connected to the isolation valve, wherein the gas is supplied to the pneumatic actuator along a gas flow path;
- a solenoid valve operable between an open position and a closed position, wherein the open position permits the gas to flow along the gas flow path to the pneumatic actuator;
- a partial stroke test device configured to perform partial stroking of the isolation valve upon reception of a signal from a computer by sending the gas to the pneumatic actuator through a needle valve;
- and
- a universal operation hand operated valve configured to send the gas to the solenoid valve or to the partial stroke test device.
A method for operating an isolation valve, the method comprising:
- providing a gas to a control system along a gas flow path;
- operating a solenoid valve from a closed position to an open position to allow the gas to flow along the gas flow path to a pneumatic actuator having a spring that is compressible and connected to the isolation valve;
- sending a signal from a computer to a partial stroke test device to perform partial stroking of the isolation valve by sending the gas to the pneumatic actuator;
- and
- sending the gas to the solenoid valve or to the partial stroke test device using a universal operation hand operated valve;
- and further comprising preventing the gas from flowing along the gas flow path to the pneumatic actuator by melting a fusible plug.
Dependencies are inferred from the claim text.