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3120A Series Dual-Stage High-Purity Regulator - Brass

USD $854.40

3120A Series Dual-Stage High-Purity Regulator - Brass

USD $854.40
Part Number:    3120A Series
   Availability:   Ships within 24 hours from Montgomeryville, PA

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Product Description

MATHESON made in the USA



High-purity brass regulators designed for use with analytical applications. For use with non-corrosive gases.


• Supply of carrier gas/detector support gas for a variety of gas chromatography applications.
• Supply of calibration standards to on-line process analyzers, emission monitoring systems, etc.
• High purity applications with non-corrosive gases requiring a constant delivery pressure.


Looking for something a little bit different? Different inlet or outlet fitting or remove the outlet valve? Check out our Modified 3120A Pressure Regulator.

Design Features

• High-purity nickel plated brass barstock body
• High-purity 316L stainless steel diaphragm
• Metal to metal seals minimize diffusion of contaminants
• 2-1/2” inlet and delivery pressure gauges
• Equipped with outlet diaphragm valve
• Bonnet ported and threaded to pipe gases away from work area
• 1/4” compression tube outlet connection
• 10 micron metal filter protects seat from contamination
• Panel mountable, front bonnet and back bonnet threaded
• Optional interstage relief valve available
• Bonnet vent holes size: 1/8” FNPT

Ordering Information  
Part Number* Max
Delivery Pressure
Delivery Pressure
Cylinder Pressure
SEQ3120ACGA 15 psi -30"-0-30 psi 0-4000 psi
SEQ3121ACGA 50 psi -30"-0-100 psi 0-4000 psi
SEQ3122ACGA 125 psi -30"-0-200 psi 0-4000 psi
SEQ3126ACGA 250 psi 0-400 psi 0-4000 psi
SEQ3128ACGA 500 psi 0-1000 psi 0-4000 psi

*Note: where CGA is replaced by the actual CGA number. Some CGA limitations may apply. (NI) for 1/4" FNPT inlet

Materials of Construction

• Gauges: Chrome plated brass
• Body: Nickel plated brass barstock
• Bonnets: Chrome plated brass barstock
• Diaphragms: 316L stainless steel
• Seats:
          1st Stage – Teflon
          2nd Stage – Teflon
• Seals: Metal to metal
• Valve Body (4370 Series): Nickel Plated Brass
• Valve Diaphragm: 316L stainless steel
• Valve Seat: PCTFE


• Maximum Inlet Pressure: 3000 psi (20,700 kPa)
• Typical Max Flow Rate (100 psi del press) : 7 SCFM-N2 (200 SLPM)
• Flow Capacity (Cv): 0.06
• Interstage Pressure
          Model 3120A: ~350 psi
          Model 3121A: ~350 psi
          Model 3122A: ~350 psi
          Model 3126A: ~350 psi
          Model 3128A: ~560 psi
• Operating Temperature: -40°F to 140°F (-40°C to 60°C)
• Porting (Regulator Body): 1/4” NPT Female
• Porting Configuration: 2 High, 3 Low, l Interstage

  Mounting Options
  Mounting Bracket for Dual-Stage Regulators
PMK-2N Mounting Nuts are also needed (see below).
The rear bonnet of the regulator mounts to this bracket.
  PMK-2N Mounting Nuts
These nuts can be used either with the above bracket or for mounting in a panel.
  53 Series Protocol Station
This brass manifold has a CGA bushing outlet connection for easy attachment of a cylinder regulator. The manifold also has a mounting bracket, flex hose, and CGA fitting with integral check valve.


Flow Curves

Flow Curves, 3120A/3810A Series


Instructions, General Regulator


Drawing, 3120A

3D Model


Warranty Information

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