Screw actuated air shutoff valve

An air shutoff device, comprising:

• a device body having a portway configured to connect to an air intake of an engine;
• a gate having a shape for closing off the portway;
• a dual linear guide system, disposed within the device body, and comprising:
• a first linear guide rail and a second linear guide rail,
• a first spring disposed concentric with the first linear guide rail, and
• a second spring disposed concentric with the second linear guide rail,
• wherein the gate rides upon the first and second linear guide rails and wherein the first and second springs of the linear guide system operate to push against at least one surface of the gate to cause the gate to move upon the first and second linear guide rails to cause the gate to return to a fail-open or fail-closed position relative to the portway.

An air shutoff valve for a diesel engine, comprising:

• a valve body having a portway configured to connect to an air intake of the diesel engine;
• a linear guide system comprising a first linear guide rail disposed at a first side of the valve body, and a second linear guide rail disposed at a second, opposite side of the valve body;
• a gate having a first guide rail channel extending through a first side of the gate and a second guide rail channel extending through a second side of the gate, wherein the first linear guide rail extends through the first guide rail channel and the second linear guide rail extends through the second guide rail channel such that the gate rides upon the first and second linear guide rails;
• and a screw and nut system configured to apply linear force to the gate to cause the gate to ride upwards, or downwards, along the first and second guide rails to either close, or open, the portway.