45 Monitor Interlock Operating Principle Keyhole shaped slots allow top plate to slide when nut head is raised. Tongue prevents cover from sealing unless it is retracted. Top “sliding” plate Fixed plate Mounting nut typ for 3 Bolt heads prevent top plate retraction. Vessel wall Attempted direction of retraction CDF® cartridge compresses spring and pushes bolt head upward to allow top plate to slide. Tongue prevents cover sealing. CDF® cartridge No CDF® cartridge installed so plate will not retract and cover will not seal. Tongue now clear of sealing surface and cover can seal. Plan View - Interlock Assembly Position 1 - Before Tightening Position 2 - Tightened Down to Retract Position 3 - Fully Installed
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