Pressure abatement emergency shut down assembly with a collapsible member retained valve member

A fluid control assembly configured to isolate a pressurized fluid when the pressure thereof falls below a low pressure threshold, comprising:

• an under pressure abatement assembly comprising:
• a collapsible member;
• a pivotal valve member;
• means for exerting a collapsing force on the collapsible member and for securing or releasing the valve member in an open position;
• and
• means to direct the pressurized fluid to exert an opposing force in opposition to the collapsing force;
• and
• wherein when the pressurized fluid falls below the low pressure threshold, the collapsing force will be greater than the opposing force to collapse the collapsible member and the valve member will be pivoted to a closed position.

A fluid control assembly, comprising:

• a normally open valve member moveable between an open position to allow a flow of pressurized fluid along a conduit and a closed position to impede said flow of pressurized fluid;
• a piston coupled to the valve member and slidable between a first extent to retain the valve member in the open position and a second extent to release the valve member and facilitate transition of the valve member to the closed position;
• a biasing member which urges the piston in a direction toward the second extent;
• and
• a collapsible member coupled to the piston and configured to mechanically collapse responsive to advancement of the piston to the second extent responsive to a reduction in a pressure of the fluid.