High Pressure First Stage Regulators 
LV4403SR and TR Series


Provides accurate first stage regulation in two-stage bulk tank systems. Reduce tank pressure to an intermediate pressure of 5 to 10 PSIG. Also used to supply high pressure burners for applications like industrial furnaces or boilers. Also incorporated in multiple cylinder installations.


  • Incorporate integral relief valves for added system protection.
  • Large vent helps prevent blockage and has ¾” F.NPT thread for vent piping.
  • Bonnet vent positioned over outlet to avoid icing and contamination by foreign material.
  • Unique bonnet vent profile designed to minimize vent freeze over when properly installed.
  • Replaceable valve orifice and valve seat disc.
  • Straight-line valve closure reduces wear on seat disc.
  • Large molded diaphragm is extra sensitive to pressure changes.
  • Built in pressure tap has plugged 1⁄8” F.NPT outlet.
  • Plug can be removed with a 3⁄16” hex allen wrench.
  • Extra long lever arm provides uniform delivery pressure.
  • Brilliant red finish.


Body Die Cast Zinc
Bonnet Die Cast Zinc
Nozzle Orifice Brass
Spring Steel
Valve Seat Disc Resilient Rubber
Diaphragm Integrated Fabric and Synthetic Rubber