The Jamesbury Figure 1051 Supervisory Cocks are FM (Factory Mutual) approved to provide shutoff and position indication for proper fuel light-off of either fuel oil or gas burners. 

Developed for use with semiautomatic or manual safety interlock burner management systems, these electric interlocking cocks indicate the burner cock is closed before the light-off sequence can begin. 

Figure 1051 Supervisory Cocks allow fast actuation, have low turning torque, and feature reliable, tight sealing for critical fuel control applications. Should the valve be accidentally moved out of the full closed position, the “not closed” condition is signalled to the safety interlock system. Closing the valve requires only a quick quarter turn of the handle. 

For added protection, the position of the valve handle gives visual “at a glance” indication of open or closed position. 

Limit switches on these cocks are contained in a compact die cast aluminum housing- all moving parts are enclosed to protect the switches from moisture and corrosion, tampering or accidental change. The limit switch housing assemblies are also FM approved to NEMA 4, 4X, and 6; Class I, Division 1, Groups B, C, & D; Class II Div. 1, Groups E, F & G for watertight and explosion proof hazardous location service.