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Stainless Steel
High Purity 1-Stage Regulator

Series 3400


The Series 3400 single stage regulators are designed and constructed for both high purity and general purpose applications. They provide outstanding performance, yet they are rugged and versatile enough for the laboratory or plant.


  • Low internal volume - less than 5 cc.
  • High purity diffusion resistant, metal diaphragm construction.
  • Encapsulated seat.
  • Diffusion resistant, stainless steel diaphragm packless control valve installed on outlet as standard.
  • Designed to pass an inboard helium leak-rate test of 1x10-9 cc per sec.
  • All parts ultrasonically cleaned prior to assembly.
  • Rear panel mounting holes.


The 3400 Series regulators are ideal for use with many corrosive gases, such as ammonia, hydrogen sulfide, and sulfur dioxide. They are also very useful for controlling the pressure of gas mixtures containing reactive gas components and low levels of the corrosive halogen gases, like chlorine.


  • Max. Inlet Pressure: 3000 psig
  • Operating Temp. Range: -40° to +185°F.
  • Flow Coefficient (Cv): 0.08 standard, 0.2 optional**
  • Inlet and Outlet: 1/4" NPT female
  • Outlet Valve Standard
Stainless Steel High Purity 1-Stage Regulator Series 3400

Materials of Construction

  • Body: 316L stainless steel
  • Nozzle Assembly: 316 stainless steel
  • Seat: Kel-F®
  • Diaphragm: stainless steel
  • Diaphragm Seal: Teflon®
  • Inlet Filter: stainless steel
  • Bonnet: nickel plated aluminum
  • Gauges: 316 stainless steel
  • Knob: aluminum - black anodized

NOTE: See pages 130-146 for gas data and equipment recommendations.

How To Order***

Del. Press. Range
Del. Press. Gauge
Inlet Press. Gauge
3401-25-CGA* 5-25 0-60 0-3000
3401-50-CGA* 5-50 0-100 0-3000
3401-100-CGA* 10-100 0-200 0-3000
3401-250-CGA* 25-250 0-400 0-3000
3401-500-CGA* 100-500 0-600 0-3000
3402-25-CGA* 5-25 0-60 0-2000
3402-50-CGA* 5-50 0-100 0-2000
3402-100-CGA* 10-100 0-200 0-2000
3403-25-CGA* 5-25 0-60 0-400
3403-25-CGA* 5-50 0-100 0-400
  • *Specify CGA Connection Number when ordering.
  • **Add “HF” to basic model number (i.e. 3401HF -25-CGA).
  • ***For panel mounting bonnet add “PM” to base number (i.e., 3401PM-50-CGA).

WARNING: A Purge assembly (see pages 96 and 97) is strongly suggested when using the above regulators with any corrosive gas.

Outlet Options

 P/N Suffix
No Outlet Valve NV
1/4" Compression Fitting T4F
1/8" Compression Fitting T2F
1/4" NPT Male P4M
1/4" Hose Barb 4HB
EZ3100 Bracket
EZ3100 Bracket (see page 101).