SELECTRA
Modulating Gas Control Valves
Selectra
Modulator Valves
Maxitrol’s unique modulator valves provide precise, non-fluctuating, instantaneous temperature control without requiring a motor or mechanically driven butterfly valve.
Certifications
Fuel Gases
Suitable for natural, manufactured, mixed, liquefied petroleum and liquefied petroleum gas-air mixtures (H, H‑1 models for use with liquefied petroleum and other applications).
Pipe Sizes
| Model | Pipe Sizes |
| M410, M411 Series, M420 Series, M451, M451‑1, M451W, M451W‑1 | ⅜”, ½” |
| M510, M511 Series, M520 Series, M551, M551‑1, M551W, M551W‑1 | ½”, ¾” |
| M610, M611 Series, M620 Series, M651, M651‑1, M651W, M651W‑1 | ¾”, 1″ |
Selectra
Modulator-Regulator Valves
MR valves perform dual function of modulation and pressure regulation.
Certifications
Fuel Gas
Suitable for natural, manufactured, mixed, liquefied petroleum and liquefied petroleum gas-air mixtures (H, H‑1 models for use with liquefied petroleum and other applications).
Pipe Sizes
| Model | Pipe Sizes |
| MR212D, MR212D‑2, MR251D | 1″, 1 ¼”, 1 ½” |
| MR212E, MR212E‑2. MR251E, MR212G, MR251G | 1 ½”, 2″, 2 ½”, 3″ |
| MR410, MR410‑1, MR410H‑1 | ⅜”, ½” |
| MR510, MR510‑1, MR510H‑1 | ½”, ¾” |
| MR610, MR610‑1, MR610H‑1 | ¾”, 1″ |
| Title | Description | Version | Download |
|---|---|---|---|
| Modulator; Modulator/Regulator Valves | Catalog; M/MR valves for atmospheric, infrared & direct fired burners (excerpt). | 🇺🇸 North America, Imperial Units; GPR_MS_EN_05.2023 | DownloadPreview |
| Modulator; Modulator/Regulator Valves | Literature; M/MR valves for atmospheric, infrared & direct fired burners. | 🇺🇸 MMR_MT_EN_09.2017 | DownloadPreview |
| Gas Pressure Regulator and Modulator Catalog (NA) | Catalog; Gas Pressure Regulators and Modulators (full catalog) | 🇺🇸 North America, Imperial Units; GPR_MS_EN_05.2023 | DownloadPreview |