Bellofram Type 41 Precision Air Pressure Regulator

The Type 41 regulators are designed for applications requiring high flow capacity, low droop, high accuracy, and fine adjustment sensitivity. The use of Bellofram’s rolling diaphragm provides greater sensitivity and improved accuracy. In addition, Type 41 regulators offer reduced overall size and several mounting options, providing direct interchangeability with more expensive competitors’ units. Ruggedly designed and constructed, the Type 41 regulators have housings of precision-cast aluminum. They are pressure tested, and are chromate treated for internal corrosion resistance. Every regulator is finished with vinyl paint which resists scratching, weathering and other physical abuse. Careful design and quality materials throughout assure long, trouble-free operation in the most difficult industrial environments. 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. The design of these regulators is especially well suited for panel applications due to ease of mounting (only one panel hole required), small size, adjustment sensitivity (32 threads per inch on the adjusting screw), and knob. The Type 41-1 comes standard with 1⁄4 NPT ports and a knob, and can be panel mounted using either the center nut or the threaded shoulder holes, spaced 1.5 in. (38.1 mm) center-to-center.

Data Sheet

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  • Superior regulation characteristics
  • Rugged, corrosion-resistant construction
  • Excellent stability and repeatability
  • Self-relieving of excess downstream pressure
  • Low droop at high flow
  • Mounting options available


  • Panel Mounted Applications
  • Constant Flow Monitoring
  • Corrosive Environments
  • Low or Zero Flow Monitoring
  • Downstream Flow