This specific model is a high pressure limit control designed to shut down the burner when the maximum safe system pressure is exceeded

electric heating elements

the 400R is a steam primary low water cut-off

Most units ship with the set screw pre-installed in the hub

Engineered with a rugged metal body

Johnson Controls VG2231TL Valve Els PW 29614 This specific model is aThe Johnson Controls VG2231TL is a heavy duty, 2 way normally open globe valve engineered for precision flow control in commercial HVACR systems. Built with a rugged cast iron body and durable brass trim, this 2 1 2 inch valve is designed to handle hot water, chilled water, and 50% glycol solutions, as well as saturated steam up to 35 psig. It features an ANSI Class 125 flat faced flange connection and a 51 Cv flow coefficient, ensuring high capacity