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The Marsh Bellofram Type 41-2 Precision Air Regulator comes standard with 1⁄4 NPT ports, a knob and a bonnet vent port which can be tapped for a 1⁄4 NPT fitting if desired. It can be panel mounted using either the center nut or the threaded shoulder holes, spaced 1.25 in. (32.7 mm) center-to-center.
The Type 41 Precision Air Pressure Regulator incorporates a patented Bellofram rolling diaphragm design and is essential for applications which require high flow capacity, low droop, high accuracy and fine adjustment sensitivity. The 41-2 regulator provides a smaller size and several mounting options, allowing it to be used as compact drop-in replacements for other manufacturers’ models.
The robust design and construction of the Type 41 uses precision cast aluminum housings which are finished with vinyl paint to resist scratches, weathering and other challenging environmental conditions. Use of quality materials ensures long, worry-free operation. All units are pressure tested and chromate treated for internal corrosion resistance. A rubberized, soft-seat valve stem provides stability and “forgives” dirt and other foreign matter. An aspirator maintains downstream pressure and compensates for droop when high flow occurs. The gauge port is convenient for gauge installation and can also be used as an additional full flow outlet.
Sensitivity | 1" Water Column (2.5 cm) |
Flow Capacity @ 100 psig (6.9 BAR) Supply and 20 psig (1.4 BAR) outlet | 25 SCFM (700 LPM) |
Effect of Supply Pressure Variation (25 psig/1.7 BAR) on Outlet Pressure | ±0.35 PSIG (24 mBAR) |
Exhaust Capacity 5 psig (0.35 BAR) above 20 psig set point | 0.1–0.45 SCFM Typical 2.8 - 12.7 LPM |
Max Supply Pressure | 250 PSIG (17.2 BAR) |
Effect of Changes in Flow on Regulated Pressure (100 psig / 6.9 BAR Supply) | 1 psig (0.07 BAR) over flow of 10 SCFM (0-30 psig / 0-2.1 BAR range, 1/4 NPT, 20 psig / 1.4 BAR set point) |
| 0-2 PSIG (0-0.14 BAR) 0-10 PSIG (0-0.69 BAR) 0-30 PSIG (0-2.1 BAR) 0-60 PSIG (0-4.1 BAR) 0-100 PSIG (0-6.9 BAR) |
Temperature Range | 0-160 °F (-18 to 71 °C) |
Total Air Consumption @ Maximum Output | 6 SCFH (2.8 LPM) |
Port Size | 1/4 NPT, BSPT |
Materials of Construction | Body: Die cast aluminum with vinyl paint Adjusting Screw: Plated steel Trim: Plated steel, brass, acetal resin Diaphragm: Buna-N polyester fabric Knob: Phenolic Plastic Spring: Music wire |
Mounting Options | Pipe, Panel or Bracket |
- • Panel Mounted Applications
- • Constant Flow Monitoring
- • Corrosive Environments
- • Low or Zero Flow Monitoring
- • Downstream Flow