General Description Chapter 1
750-177 1-5
7. Auxiliary Low Water Cutoff (Not Shown) (Optional): Breaks the circuit to stop burner operation if the water level in
the boiler drops below the master low-water cutoff point.
8. Safety Valve(s): Prevent buildup over the design pressure of the pressure vessel. The size, rating and number of valves
on a boiler is determined by the ASME Boiler Code. The safety valves and the discharge piping are to be installed to
conform to the ASME code requirements. The installation of a valve is of primary importance to its service life. A
valve must be mounted in a vertical position so that discharge piping and code-required drains can be properly piped
to prevent buildup of back pressure and accumulation of foreign material around the valve seat area. Apply only a
moderate amount of pipe compound to male threads and avoid overtightening, which can distort the seats. Use only
flat-jawed wrenches on the flats provided. When installing a flange-connected valve, use a new gasket and draw the
mounting bolts down evenly. Do not install or remove side outlet valves by using a pipe or wrench in the outlet.
Only properly certified personnel such as the relief valve manufacturer’s certified representative can adjust or
repair the boiler relief valves. Failure to follow these instructions could result in serious personal injury or
death.
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