Watson McDaniel Company Safety Relief Valve WSVB-18M-18S-J

The WSVB Safety Relief Valves are used for over-pressure protec- tion on unfired pressure vessels in saturated steam systems. As safety valves open on a non-compressible fluid applica- tion, the disc lifts directly proportional to the increase in system pressure over the valve set point. Safety relief valves not only provide over pressure protection resulting from thermal expansion of liquids but will respond with a rapid full opening “pop” action on systems which contain steam, air or gas.