weighted relief valve (WRV) protects your blower package by allowing excess air pressure to relieve at a predetermined set point. This design is very efficient, consistent and it will provide years of maintenance free operation. The weighted relief valve is easily installed in the vertical position on the discharge side of the silencer. The valve body is available in 2”, 3”, or 4” NPT connection sizes. The set point is controlled by removable weights which are available in either 0.5 PSI or 1.0 PSI increments.