Thermal Expansion Relief Valve

This is a pressure relief valve that is installed downstream of a pressure reducing valve and is located in the distribution piping in a fire protection system. If the pressure in the distribution piping rises above the relief valve’s set point, the 1330FC opens and relieves the excess pressure, thus preventing damage.



  • Normally closed, increasing inlet pressure opens valve
  • UL listed spring range of 20-175 psi
  • Local sense line (self contained sense loop)
  • Simple adjustment
  • All parts replaceable while valve is installed
  • Rubber to metal seat for positive shutoff
  • Can be installed vertically or horizontally
  • Sizes 1/2”, 3/4”, 1”
  • Applicable for water, seawater & foam