Type 41 high-performance air pressure regulator series is designed to support a variety of demanding industrial and OEM flow monitoring requirements.

Available in two different packages with identical performance characteristics, both with 1/4" NPT BSPT port size, design of the Type 41 incorporates the use of a patented Bellofram rolling diaphragm for greater sensitivity and improved accuracy, along with low-friction operation and extended useful service life, in a compact size. The rugged construction of the Type 41 further incorporates the use of precision die-cast aluminum housings, finished with scratch- and weather-resistant vinyl paint, to increase resistance to harsh environmental conditions.  In addition, units are pressure- 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 installation and can also be used as an additional full flow outlet. Users can select from among pipe, panel, or bracket mounting options.

The unique design and performance characteristics of the Marsh Bellofram Type 41 allows it to be used as a drop-in replacement for other manufacturer’s models, particularly in applications where high flow capacity, low droop at high flow, repeatable accuracy,  fine adjustment sensitivity or panel mounting may be required, though where available installation space is limited. Typical applications include constant flow monitoring, low- or zero-flow monitoring, downstream flow, or corrosive environment air pressure monitoring