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High Flow - High Purity Regulator
Series 3831H


The 3831H series regulators are designed for high flow applications involving high purity gases. The series features a Cv of 0.55 and excellent regulation.


  • Capable of high flows with only a small pressure drop.
  • High purity metal diaphragm construction.
  • All parts ultrasonically cleaned prior to assembly.
  • Excellent pressure regulation – 1.6 psi/100 psi.
  • Encapsulated seat with 10 micron filter.


The 3831H series regulators are ideal as manifold, laser assist gas, or pipeline regulators for high flow systems of high purity or industrial gases.


Max. Inlet Pressure: 3000 psig* 3000 psig*
Operating Temp. Range: -40°F to 165° -40°F to 165°
Flow Coefficient (Cv): 0.55 0.55
Inlet and Outlet: 1/2" NPT female 1/2" NPT female

Materials Of Construction

Body: brass barstock brass barstock
Bonnet: forged brass forged brass
Diaphragm: 302 SS** 302 SS**
Seat: PTFE Teflon PTFE Teflon
Seals: PTFE Teflon PTFE Teflon
Nozzle: brass brass

How To Order

ModelDel. Press. Range
Del. Press. Gauge
Inlet Press. Gauge
3831H-015 0-15 0-30 0-600
3831H-050 0-50 0-100 0-4000
3831H-125 0-125 0-200 0-4000
3831H-250 0-250 0-400 0-4000
3831H-500 0-500 0-1000 0-4000
3831HL-015 0-15 0-30 none
3831HL-050 0-50 0-100 none
3831HL-125 0-125 0-200 none
3831HL-250 0-250 0-400 none
3831HL-500 0-500 0-600 none
  • *500 psig on the 0-15 psig models.
  • **0-15 psig models have a neoprene diaphragm and seat.