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High Purity Line Regulator

Series 3101L


The 3101L Series line regulators are designed to suit a large variety of applications. The high purity design makes them ideal for line drop regulators in instrumentation labs, with the 0.2 Cv orifice they are capable of very high flow rates.


  • Small internal volume - less than 5cc.
  • Capable of large flows with only a small pressure drop.
  • High purity diffusion resistant, metal diaphragm construction.
  • Encapsulated seat.
  • Diffusion resistant, brass diaphragm packless control valve installed on the 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 3101L Series is an excellent choice for gas flow applications with low inlet pressures and low differential pressure between regulator inlet and outlet.


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

Materials of Construction

  • Body: brass
  • Nozzle Assembly: brass
  • Diaphragm: stainless steel
  • Seat: Kel-F®
  • Diaphragm Seal: Teflon®
  • Inlet Filter: stainless steel
  • Bonnet: nickel plated aluminum
  • Gauge: brass
  • Knob: aluminum - black anodized
Stainless Steel High Purity 2-Stage Regulator Series 3500
EZ3100 Bracket
EZ3100 Brackets
(see page 101).

How To Order***

Del. Press. Range
Del. Press. Gauge
3101L-10 5-10 0-30
3101L-25 5-25 0-60
3101L-50 5-50 0-100
3101L-100 10-100 0-200  
3101L-250 20-250 0-400  
  • **Add "HF" to basic model number (i.e. 310LHF-25).
  • ***For panel mounting bonnet add “PM” to base number (i.e., 3101LPM-50).

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