Model 337


Model 337 has ’pull-ring’ lift device for easy manual testing.


  • Large nozzle design provides high capacity.
  • Flat bronze valve seats are lapped for optimum performance.
  • Warn ring offers easy adjustability for precise opening with minimum pre-open or simmer and exact blowdown control.
  • Pivot between disc and spring corrects misalignment and compensates for spring side thrust.

Model 337

Pressure Limit:1 to 60 psig
Temperature Limit:-20° to 406°F
Sizes, in & out:2'', 2 1/2'' and 3''


  • Bulk hauling trailers/equipment.
  • Light gauge tanks.
  • Protection of low-to-medium pressure, high volume blowers, compressors and pneumatic conveying systems.