Model VR vacuum relief valves are used in systems to maintain a desired vacuum level.
Model VR is a proportional relief valves and not “pop” type safety valves.
Unit is not preset at the factory but easily field adjusted with knurled adjustment screw and locked with jam nut.
All brass construction with stainless steel springs and ball as poppet.
Maximum temperature 250° F
Maximum vacuum pump size ¼ HP