Ball check valve: This is a safety device and installed on the water leg of the gauge. Its function is to stop flow of steam/water instantaneously in the event of gauge glass breakage, thereby preventing any chance of injury to the service personnel.
Illuminator: Illuminators are provided for indication of steam (Red) or water (Green). They are modular in design and self ventilated. The LED Illuminator uses very low power and is available for outdoor application.