Marsh Bellofram

The Bellofram Group of Companies is an AS9100D and ISO9001:2015 certified leading global manufacturer of high-performance OEM, industrial and process control instrumentation, including timers and counters, digital controllers and panel meters, RTD’s and thermocouples, pressure instruments and gauges, FRLs, cylinders, natural gas and propane pressure regulators, air pressure regulators and transducers, tank and liquid level measurement systems, pump and motor protection switches and alternating relays, as well as sensors, DC tachometers, encoders, industrial diaphragms, and specialty silicones.

Product Groups

Precision Air Pressure Regulators

Direct-acting, high-performance Marsh Bellofram air pressure regulators offer precision control, high-accuracy, maximum stability, large flow and exhaust capabilities to support even the most challenging OEM and industrial applications.

Electronic Pressure Transducers

Electro-pneumatic transducers are used to convert current or voltage input signals to proportional output pressures. They are used for process control in valves, pneumatic relays and flow regulators. The PCD division of Marsh Bellofram designs and manufactures high-precision voltage-to-pressure (E/P), current-to-pressure (I/P), and pressure-to-current (P/I) transducers for a variety of industrial and OEM applications.

Pneumatic (Air) Relays

Marsh Bellofram pneumatic relays are designed to provide cost-effective, high-performance air regulation across a variety of applications, and in support of a variety of market requirements. Available versions and types include two-stage, pilot operating 1:1; positive and negative biasing, positive bias booster, high relief, adjustable bias, and ratio high-flow relays, all of which provide highly accurate and reliable output pressure control.

Servo Pressure Controllers

Marsh Bellofram designs and manufactures a complete line of servo pressure controllers, including both traditional and analog circuit card models, to suit a variety of OEM, industrial, HVAC and medical device and equipment process control applications.

Diaphragm Air Cylinders

Marsh Bellofram diaphragm Air Cylinders are actuators made from elastomers, engineered metals and fabrics. They require no lubrication and are virtually frictionless and economical. They can be used to provide lifting, clamping, pushing, coining, turning and other linear force or actuation motions in many applications.

Filter Regulator Lubricator

Marsh Bellofram Filter-Regulator-Lubricators (FRLs) are designed with economy and convenience in mind. Filter Regulators have the same features as the regulators with the addition of polycarbonate bowls, 5 or 50 micron filters, and with manual, semi-automatic or automatic drains. Lubricators feature polycarbonate bowls, with field- settable dials providing variable lubrication between 0 and 90 drips per minute.

Accessories & Add Ons

Digital Pressure Indicator

The Marsh Instruments Digital Pressure Indicator is portable, lightweight, hand-held testing and calibrating instrument indicates pressure to 50 psig at accuracy levels of ±0.25% of reading ±1 count. A state-of-the-art semiconductor-type pressure transducer converts pressure input to analog voltage, which is displayed on 3-1⁄2 digit LCD readout. Internal 9-volt rechargeable battery powers the indicator, and a zero adjust potentiometer standardizes the transducer bridge at zero pressure for higher accuracy.


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