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81-2 Series Dual Stage General Purpose Low Delivery Pressure Regulator - Brass

USD $793.52

81-2 Series Dual Stage General Purpose Low Delivery Pressure Regulator - Brass

USD $793.52
Part Number:    81-2 Series
   Availability:   Ships within 24 hours from Montgomeryville, PA

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Product Description

MATHESON made in the USA



General purpose regulators designed to reduce full cylinder pressure (maximum 3000 psi) down to very low working pressures (0.1 to 2 psi).


• Regulation of fuel supply to burners.
• Purging low pressure environmental chambers.
• Maintaining low pressure blankets of inert gas on fuel and chemical storage facilities. 

Design Features

• General purpose forged brass body
• 2-1/2” inlet and delivery pressure gauges
• Equipped with outlet needle valve
• Internal interstage relief valve set at 700-750 psi
• Porous metal filter protects seat from contamination
• 1/4” NPTM outlet connection with loose 1/4" hose barb

Ordering Information  
Part Number* Max
Delivery Pressure
Delivery Pressure
Cylinder Pressure
SEQ812CGA 2 psi 0-3 psi 0-3000 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: Chrome plated forged brass
• Bonnets: Chrome plated zinc diecast
• Diaphragms:  Neoprene
• Seats:  PTFE
• Seals: Neoprene/PTFE


• Maximum Inlet Pressure: 3000 psi (20,700 kPa)
• Typical Max Flow Rate (1.5 psi del press): 20 SLPM
• Flow Capacity (Cv): 0.15
• Internal Interstage Relief Valve: 700-750 psi
• Operating Temperature: -20°F to 140°F (-29°C to 60°C)
• Porting (Regulator Body): 1/4” NPT Female
• Porting Configuration: 2 High, 2 Low

  Mounting Options
  53 Series Protocol Station
This brass manifold is designed to provide a safe, reliable way of wall-mounting a cylinder regulator. Manifolds are provided a durable stainless steel bracket, stainless steel flex hose (3 ft std.), and a CGA connection with integral check valve.


Flow Curves

Flow Curves, 81-2 Series


Instructions, Economy Regulator


Drawing, 81-2

3D Model


Warranty Information

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