Dual-acting multi-actuation mode gate valve

A safety device for a valve, comprising:

• a mechanical connection configured to mount between an actuator and a shaft of the valve, wherein the mechanical connection is configured to fail in response to an internal pressure such that the valve blocks fluid flow through the valve.

A method of operation of a valve, comprising:

• controlling an actuator to move a mechanical connection to cause movement of the valve between first and second positions;
• and
• moving the valve between the first and second positions by severing the mechanical connection between the actuator and the valve in response to an internal pressure.

A method of testing a valve, comprising:

• applying a signal to an actuator drivingly coupled to a valve via a mechanical connection, wherein the valve is configured to block fluid flow through the valve via the failure of a mechanical connection in response to an internal pressure.

A system, comprising:

• a valve comprising a movable portion disposed in a body;
• and
• a buckling pin coupled to the movable portion and located between the movable portion and an actuator, wherein the buckling pin is responsive to the actuator to move the movable portion between a first valve position and a second valve position, wherein the buckling pin is configured to selectively fail to a permanently bent configuration that positions the movable portion in the second valve position.