Bi-directional overpressure shut-off valve

A valve body defining a flow passage having at least an inlet port and an outlet port;

• a valve element disposed at least partially within the flow passage and moveable between an open position and a closed position;
• a valve actuator coupled to the valve element and responsive to pressurized fluid supplied thereto and vented therefrom to move the valve element between open position and the closed position, respectively;
• a shuttle valve housing having a first fluid port in fluid communication with the valve body flow passage inlet port, a second fluid port in fluid communication with the valve body flow passage outlet port, and a third fluid port;
• a shuttle element disposed within the shuttle valve housing and movable between (i) a first position, in which the second fluid port is in fluid communication with the third fluid port and the shuttle element fluidly isolates the first fluid port from the third fluid port, and (ii) a second position, in which the first fluid port is in fluid communication with the third fluid port and the shuttle element fluidly isolates the second fluid port from the third fluid port;
• a fluid-operated switch having a first fluid inlet, a second fluid inlet, a third fluid inlet, an actuator port, and an actuator vent port, the fluid-operated switch first fluid inlet in fluid communication with the valve body flow passage outlet port, the fluid-operated third fluid inlet in fluid communication with the shuttle valve housing third fluid port, the fluid operated switch actuator port in fluid communication with the valve actuator, the fluid-operated switch operable to selectively (i) supply pressurized fluid to the actuator via the fluid-operated switch actuator port and (ii) vent the pressurized fluid from the actuator via the fluid-operated switch actuator port and the fluid-operated switch actuator vent port;
• and
• a control valve having an inlet, an outlet, a vent port, and a control element selectively movable between a first position and a second position, the control valve inlet in fluid communication with the fluid-operated switch second fluid inlet, the control valve outlet in fluid communication with the fluid-operated switch third fluid inlet,
• wherein:
• when the control element is in the first position, the control valve outlet is in fluid communication with the control valve vent port and not in fluid communication with the control valve inlet, and
• when the control element is in the second position, the control valve outlet is in fluid communication with the control valve inlet and not in fluid communication with the control valve vent port.