Maxitrol M/MR Modulating Valve

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The unique Modulator or Modulator/Regulator valve, the heart of the Selectra® Electronic Gas Flame Modulating System, provides precise, non-fluctuating, instantaneous temperature control without requiring a motor or mechanically driven butterfly valve.

Features:

• No External Mechanical Activation required 
• MR Valve (only) performs dual function of modulation and pressure regulation.
• Provides infinite, continuous flame adjustment.
• May be factory installed or added in the field.
• Capacities to 30,000 CFH.
• Available in a wide range of body styles and pipe sizes.
• Designed for use with the Maxitrol Selectra® series of modulation systems – or SC11 Signal Conditioners convert computer/PLC controller signals if standard Maxitrol companion controls are not specified.

Available Options: 

M511 ¾” NPT:

• Max. Current Draw: 0.5 (amps)
• Application: Direct Fired (Negative Pressure) Burners
• Function: Increase in voltage corresponds to increase in outlet pressure  
• CSA Tested* Inlet Pressure: 1/2 psi (3.4 kPa)
• Inlet Pressure Operating Limits: Upstream pressure regulator setting 
• Upstream Pressure Regulator Required: Yes 
• Maximum Emergency Exposure: 2.5 psi (17 kPa)
• Output Control Means Standard Factory Setting (if applicable):
• Low Fire: adjustable orifice bypass
• High Fire: upstream pressure regulator setting less pressure drop
• NOTE: 7” w.c. (1.7 kPa) max outlet pressure 
• System Used With: Series 14, 24, 44, 94, SC11, DFM

 M611 3/4″ or 1″ NPT:

• Max. Current Draw: 0.6 (amps)
• Application: Direct Fired (Negative Pressure) Burners
• Function: Increase in voltage corresponds to increase in outlet pressure  
• CSA Tested* Inlet Pressure: 1/2 psi (3.4 kPa)
• Inlet Pressure Operating Limits: Upstream pressure regulator setting 
• Upstream Pressure Regulator Required: Yes 
• Maximum Emergency Exposure: 2.5 psi (17 kPa)
• Output Control Means Standard Factory Setting (if applicable):
• Low Fire: adjustable orifice bypass
• High Fire: upstream pressure regulator setting less pressure drop
• NOTE: 7” w.c. (1.7 kPa) max outlet pressure 
• System Used With: Series 14, 24, 44, 94, SC11, DFM

MR212D 1-1/4″ or 1-1/2″ NPT, MR212E 1-1/2″ or 2″ NPT:

• Max. Current Draw: 0.4 (amps)
• Application: Direct Fired (Negative Pressure) Burners
• Function: Increase in voltage corresponds to increase in outlet pressure  
• CSA Tested* Inlet Pressure: 5 psi (34 kPa)
• Inlet Pressure Operating Limits:  5 psi (34 kPa)
• Upstream Pressure Regulator Required: No
• Maximum Emergency Exposure: 12.5 psi (86 kPa)
• Output Control Means Standard Factory Setting (if applicable):
• Low fire: adjustable orifice bypass
• High fire: spring adjustment
• High Fire Setting: Std. model: 2 -5” w.c. (0.50-1.25 kPa) “-2” model: 2” – 5” w.c. (0.50-1.25 kPa) reduced to 0-3” w.c. (0-0.75 kPa) 
• System Used With: Series 14, 24, 44, 94, SC11, DFM

Resources:

• M/MR Modulating Valve Technical Literature

Capacity Table:

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