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Marsh Bellofram is a world class instrumentation manufacturer with powerful product support, and near flawless distribution. Our mission is to engage the current and future needs of our customers with swift, professional service while providing the highest quality instrumentation products at the most competitive prices. |
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Precision Control Devices (PCD) - Marsh Bellofram’s line of regulators started with an idea that changed regulator design for the entire industry. In 1955, Bellofram Corporation introduced the rolling seal diaphragm design for a line of low-friction cylinders and soon adapted the design to a new line of gas pressure regulators. This new rolling seal diaphragm design produced a gas regulator of unsurpassed precision and repeatability. This design innovation is present in the entire line of Marsh Bellofram regulators, relays, I/P’s and E/P’s. If your process cannot accept any less than the best in precision and repeatability, Marsh Bellofram is there to provide that control.
Installation & Maintenance Manuals Available (Contact Us) | |
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Air Regulators |
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Type 10 Pressure Regulator The Bellofram Type 10 Regulator controls output pressure with an accuracy of 0.1%, and has very low sensitivity to changes in supply pressure and flow. The Type 10 Regulator has been designed to eliminate the need for any readjustment of the regulated pressure after long “down time.” |
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Type 40 Pressure Regulator Marsh Bellofram’s General Purpose Type 40 Pressure Regulator is a reliable precision unit designed for instrumentation and general purpose use. |
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Type 41 Precision Air Regulators 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 over-all size and several mounting options, providing direct interchangeability with more expensive competitors’ units. |
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Type 50 Filter Regulators (NACE) Marsh Bellofram’s General Purpose Type 50 & Type 50 NACE Filter Regulators are reliable precision units designed for instrumentation and general purpose use in both standard environments (Type 50), and corrosive environments (Type 50 NACE). The Type 50 NACE complies with NACE material requirement #MR-01-75 for sulfide stress cracking resistant metallic material for oilfield equipment. |
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Type 51 & 51SS Regulators The Bellofram Type 51 Precision Air Regulator series offers a high-performance regulator in a compact, low cost package. It operates in output pressure ranges up to 100 psig / 6.9 BAR (120 psig / 8.3 BAR in T-51FR Corrosive Tec), with a maximum supply pressure of 250 psi (17.3 BAR). The Type 51SS regulator product line is designed for service with a wide variety of corrosive gases and environments. Special construction features include 316 stainless steel for the housing and filter assemblies, with fluorocarbon elastomers used for the control diaphragm and the supply valve. |
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Type 60 & Type 65 Pre-Set Regulators Marsh Bellofram’s General Purpose Type 60 & Type 65 Precision Air Regulators are reliable precision units designed for instrumentation and general purpose use. The Type 60 is a pre-set, fixed-pressure unit with a dripwell. The Type 65 is similar to the Type 60,but without a dripwell. |
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Type 70 & Type 70BP Regulators The Type 70 Regulator is specifically designed for applications that require substantial flow capacity and accurate pressure controls. Flows of 80 SCFM (2250LPM) can be attained. The Type 70 Back Pressure Regulator functions as a high flow, high precision pneumatic relief valve with an adjustable setpoint. The Type 70BP can be used in place of a standard relief valve to improve pressure control while maintaining protection against over pressurization, as in supply pres-sure lines to instruments and other control devices.
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Type 77 Vacuum Regulator Bellofram’s Type 77 Vacuum Regulator incorporates a fixed negative 15 psig bias spring to maintain vacuum outputs up to 29" Hg. An adjustable opposing range spring increases controlled pressure outputs up to 150 psig. |
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Type 78 High Flow Precision Air Regulator The Type 78 regulator is specifically designed for applications that require large flow capability and accurate pressure control. This regulator offers low droop, high accuracy, and fine adjustment sensitivity. The use of a Bellofram rolling diaphragm provides greater sensitivity and improved accuracy. The Type 78 offers a balanced pintle, which minimizes output pressure changes caused by fluctuations in supply pressure. |
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Type 91 Subminiature Regulator The Type 91 Subminiature Regulator is a compact, low-cost unit which operates in pressure ranges up to 100 psi ,with a maximum supply pres-sure of 250 psi. It provides dependable reliability and accuracy for low flow or dead end applications, but is not designed for critical flow applications. The Type 91 subminiature regulator is available with a corrosion resistant anodized aluminum body and bonnet or with a brass body and bonnet. Both come standard with a fluorocarbon diaphragm.
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Type M1R & M2R Miniature Regulators The Type M1R Miniature Air Regulator is a compact, low cost regulator, which operates in output pressure ranges up to 120 psi, with a maximum supply pressure of 145 psi. The TypeM1R is available in 1/8" and 1/4" NPT port sizes. With a flow of up to 40 SCFM and low droop the M1R provides the features of a large regulator in a small package. The Type M2R Air Regulator is a mid-sized version of the M1R Miniature Air Regulator. Lakethe M1R this is a low cost regulator with output ranges up to 120 psig with a maximum supply pressure of 145 psig. The M2R is available in 1/4", 3/8", or 1/2" NPT port size. The TypeM2R can provide flow rates to 90 SCFM.
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Filters & Filter-Regulators
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Volume Boosters - Relays |
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Type 20 Precision Air Relay The Type 20 Air Relay is a compact, two-stage, pilot operated 1:1 relay with positive and negative bias adjustment capability. It accepts a signal pres-sure and combined with the bias adjustment, maintains a resulting output pressure with an accuracy and reliability unmatched by any other pressure relay in its price range. |
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Type 72 Positive Bias Booster Relay The Type 72 Relay features an adjustable bias pressure which enables users to obtain an output pressure which is the sum of a controlled input signal pressure plus the bias. The relay offers an exceptionally high flow capacity (up to 50 SCFM/1400 LPM) with minimal pressure droop. Output pressure is accurately maintained under varying flow conditions by means of an aspirator tube, which adjusts the air supply valve opening in proportion to flow velocity. A balanced supply valve utilizing a rolling diaphragm makes the relay virtually immune to changes in supply pressure. Simple design makes maintenance easy, and the relay can be serviced without removing it from the line. The standard signal-to-output ratio is 1:1, but 1:2, 1:4 and 1:6 ratios are available on special request. |
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Type 75 Relay The Type 75 relay uses signal pressure to accurately control output pressure over a wide range of flow and supply pressure variation. Under varying flow conditions output pressure is maintained by use of an aspirator tube, which adjusts the air supply valve opening in accordance with the flow velocity. A balanced supply valve, utilizing a rolling diaphragm, makes the relay virtually immune to changes in supply pressure. Maintenance is simple due to the unit construction, and the relay can be serviced without removing it from the line. Signal to output pressure ratios of 1:1, 1:2,1:4 and 1:6 are available. Maximum output is 150 psig (10.3 BAR). |
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Type 79 High Flow Precision Relay The Type 79 1:1 Ratio High Flow Precision Air Relay brings additional precision and control to the Bellofram line of precision control products. The Type 79 relay is designed for applications where a precise control of flow is needed. This regulator offers low droop, high accuracy and fine adjustment sensitivity. The use of Bellofram rolling diaphragm provides greater sensitivity and improved accuracy. The Type 79 can achieve flow rates of well over 200 SCFM (5695 LPM). This relay can be pipe or bracket mounted. A version of the Type 79 for valve control applications is available. The Type 79V utilizes soft exhaust seats to minimize air consumption, increased deadband to ignore valve oscillations, and an integral bypass valve that can be ‘tuned’ for optimum valve response. |
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I/P, E/P, P/I Transducers |
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Type 1000 I/P & E/P Transducers The Type 1000 Transducer is an electro-pneumatic device that reduces a supply pressure to a regulated output pressure directly proportional to an electrical input signal. The Type 1000 accepts a wide range of supply pressures, ranging from a minimum of 3 psig (0.2 BAR) above the maximum output up to 100 psig (6.9 BAR). An integral pneumatic volume booster is included in the design to provide high flow capacity (up to 12SCFM/339 slpm). Model selections include general purpose, NEMA 4X Type, extended range, high relief, intrinsically safe, and explosion proof.
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Type 1001 I/P & E/P Transducers The Type 1001 is a patented family of electro-pneumatic instruments that is used to reduce a supply pressure to a regulated output pressure which is directly proportional to a two-wire current or three-wire voltage input. This design incorporates closed loop sensing of the output pressure to achieve excellent accuracy and vibration stability. It also features a unique damping circuit which can be adjusted to prevent overshoot and actuator" hunting.” Model selection includes General Purpose (NEMA 1), Rainproof (NEMA 3R), and Watertight/Corrosion Resistant (NEMA 4X). NEMA4X models are also explosion-proof, and all models are intrinsically safe.
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Type 1500 I/P & E/P Transducers The T-1500 is a new series of electro-pneumatic transducers that convert an electrical signal to a proportional pressure output. It provides precision electro-pneumatic control to actuators, valves, positioners, final control elements and is ideally used for high-flow control devices. The Type 1500's compact size and accessibility to ports and adjustments allow the unit to be installed in space-constrained locations or in a manifold for multi-device control. DIN rail and manifold assemblies are available in kits that provide three, five or ten mounting points. An integral pneumatic volume booster is included in the Type 1500 design to provide high flow capacity.
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Type 2000 I/P & E/P Transducers The Marsh Bellofram Type 2000 is a robust electronic instrument that regulates an incoming supply pressure down to a precise output pressure which is directly proportional to an electrical control signal. The secret to the Type 2000’s precise, reliable performance under a variety of demanding environmental conditions is a patented piezo-ceramic actuator with many industry-wide firsts. The Type 2000 has been designed to meet the electropneumatic needs of the world with field-selectable inputs and direct/reverse/split ranging, multiple input/output/mounting configurations, and precise, reliable performance under extreme conditions of temperature, vibration, orientation, supply pressure changes, supply voltage changes, RFI/EMI, humid / oil-laden media, and corrosive surroundings. |
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Type 5000 P/I Transducers The Type 5000 series is a compact, rugged and reliable family of two-wire pressure transmitters designed for industrial field service. These instruments convert a signal pressure input into a precise 4-20 or 10-50mA output. The lightweight transmitter housing includes a 1/4" NPT pressure port and a 1/2" NPT conduit port for field wiring. Connections are easily accessible simply by removing the top cover. Zero and span adjustments are available within the field wiring compartment for fine, on-site calibration adjustment. The Type 5000 uses a unique, temperature compensated piezo resistive sensor suitable for gauge pressure measurement of non-corrosive liquids and gases. The sensor has excellent dynamic response and is virtually insensitive to mounting orientation and ordinary industrial vibration. Mounting holes on the transmitter housing are arranged to permit direct pipe (2") mounting for minimum installed cost. |
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Type 3000 "Buzmatics" I/P & E/P Transducers The Type 3000 series of electro-pneumatic transducers offers an innovative set of features and capabilities. Each electronic pressure regulator utilizes a pair of reliable quick-firing solenoid valves and an onboard pressure sensor to precisely control downstream pressure and at the same time achieve excellent accuracy and stability. Feed-and-bleed transducers are inherently resist-ant to shock, vibration, and orientation. To size the regulator for the application, a selection of external volume boosters up to 2000 SCFM are available. •Analog control signals: 0-10v, 4-20 ma, etc. •Remote sensor feedback •Monitor output •High/Low logic output •Digital signal processing •PID tuning •Deadband adjustment •Serial, keypad/display, DeviceNet interfaces
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Diaphragm Air Cylinders |
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Diaphragm Air Cylinders Diaphragm Air Cylinders are actuators made from elastomers, engineered metals and fabrics. They require no lubrication, 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. The development of the long stroke rolling diaphragm for dynamic sealing proved to be the solution for many applications requiring low friction, no lubrication, low leakage, wide temperature variations, and low total cost. The popularity of the rolling diaphragm as a sealing means led to many requests for a standard line of “off the shelf” diaphragm cylinders; single and double acting, short and long stroke with a wide selection of effective areas. To meet these requests, the long stroke rolling diaphragm cylinder was developed and Bellofram has supplied many thousands of them since their 1965 introduction. STANDARD CYLINDERS: Standard Bellofram Air Cylinders are available in eight sizes. Each size is available in both a spring-return and a double-acting variety, with one or two stroke variations (Series E or F). Sizes 4 and 6 have impact-extruded aluminum shells. Larger sizes have steel shells. Rods are ground, polished and hard-chrome plated steel. Bearings are sintered bronze, molybdenum disulphite impregnated. Other components are high strength materials with suitable corrosion resistant treatment.•Bellofram engineers will help you define your specific needs.•All Standard cylinders can be ordered with either no spring, or no bearing, as standard options.•Standard cylinders can be ordered with one of six different mounting options.•Specifications for Standard cylinders are shown in the table on the next page. SUPER CYLINDERS: Bellofram Super Cylinders are standard spring-return cylinders equipped with linear ball bearings and hardened steel rods. This refinement allows an absolute minimum of friction for applications where maximum sensitivity is needed. Super Cylinders are available only in spring-return varieties and in Series F stroke variations. All mounting options offered on standard cylinders are also available on super cylinders.
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BelGAS, the leader in pressure regulator design, offers the Oil, Gas and Pipeline Industry the same precision and reliability in flow control and pressure control that the control valve market has enjoyed for over 40 years. At BelGAS, we have raised the industry standard for quality, accuracy, and dependability. Even more important is that we provide this value to our customers at an economical price.
Bellofram Precision Controls Catalog (PDF 13.7MB) Installation & Maintenance Manuals Available (Contact Us) | |
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P627 High Flow Gas Regulator The P627 is a spring loaded, direct-operated regulator for both low and high pressure applications in the oil and gas industries. These regulators provide durability, from the powder-coated epoxy exterior finish, as well as installation versatility, from the multi-position body and spring case configurations. These regulators are also available in an external pressure registration model (P627M), and NACE construction. |
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P630 High Flow Gas Regulator The P630 is a spring loaded, direct-operated regulator for high pressure, and high flow applications. The heavy duty construction, made possible by the addition of stainless steel internal components and a powder-coated epoxy exterior finish, makes it ideally suited for the oil and gas industries. The P630 is also available in NACE construction for corrosive (sour gas) environments. |
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P39 Gas Regulator The BelGas P039 regulator selection is the largest of its type in the industry. We offer this regulator in three different materials, one of which will ideally suit your application AND your budget. All of the P039’s are offered with a minimum of five different spring ranges, with an option for a sixth range (500 psig), in our brass and nickel plated versions. Our broad selection of outlet pressure spring ranges allows for more precise regulation of downstream pressure, hence better process control. Piping designs can be simplified by using any one (or all) of the three outlet ports that come standard on the regulator. The BelGas P039, with its three outlet ports, is the only regulator of its type to offer this feature. To enhance the versatility of this regulator further, we provide you with a choice of seat materials that allows the designer to custom fit the seat material with the application. Each seat is mounted in a block that can be rotated a total of four times to increase the service life of the regulator. Capable of regulating inlet pressures of up to 5500 psig, 2900 psig (200bar) in the EU model designed specifically to meet the European Pressure Equipment Directive 97/23/EC for Group 1 gases, the BelGas P039 should be your first choice as a first-cut regulator. |
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P50 & P50 NACE Filter Regulators The BelGAS General Purpose P50 & P50 NACE Filter Regulators are reliable precision units designed for instrumentation and general purpose use in both standard environments (P50), and corrosive environments (P50 NACE). The P50 NACE complies with NACE material requirement MR0175 for sulfide stress cracking resistant metallic material for oil field equipment. |
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P51 Stainless Steel Regulator The P51SS regulator product line is designed for service with a wide variety of corrosive gases and environments. Special construction features include 316 stainless steel for the housing and filter assemblies, with fluorocarbon elastomers used for the control diaphragm and the supply valve. This ruggedly built regulator operates in pressure ranges up to 150 PSIG (10.3 BAR). The P51SSFR and P51SSAR Regulators and the P51SSF and P51SSAF filter assemblies have built-in dripwells which trap water, oil and other contaminant's. The contaminant's are easily flushed out of the dripwell via a convenient manual or automatic drain valve. The 40-48 Micron Filter is constructed of sintered 316 stainless steel, and is easily removed. |
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P32 Natural Gas & Propane Regulator Superior regulation and excellent stability make the P32 Regulator ideal for lower flow applications. Square head adjustment screw allows for easy in-field calibration. The P32 is available with handwheel adjustment, output pressure gauge and/or mounting bracket as options. |
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P36 Natural Gas & Propane Regulator This reliable precision preset regulator is ordered with the exact pressure regulation required. Ideal for areas requiring tamper resistant components or where incidental readjustment is a concern. |
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P37 Natural Gas & Propane Regulator The P37 contains many of the same characteristics as the P38, but at a reduced price. At 110SCFM (16.5 Mbtu/hr), the P37 offers flow rates comparable to current market suppliers. The use of a relief valve is recommended for this product in accordance with NFPA 58. |
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P38 Natural Gas & Propane Regulator The P38 uses a patented balanced pintle design which eliminates unsteady changes in outlet pressure due to inlet pressure fluctuations. The P38 is a spring opposed, diaphragm - operated, non-relieving regulator. The use of a relief valve is recommended for this product in accordance with NFPA 58. |
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P289 Backpressure Regulator The Type P289 Backpressure Regulator functions as a high flow relief valve with an adjustable set point. The P289 can be used in place of a standard relief valve to provide protection against over pressurization in the downstream system. The design of a large diaphragm area and a pitot tube booster allow the valve to respond quickly and relieve the excessive pressure smoothly, especially in low-pressure settings. |
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P912 Pressure Regulator The Type P912 pressure regulator functions as a pneumatic pressure controlling device with an adjustable set point. The P912 can be used in a variety of applications in which accurate pressure regulation is required. The internal relief feature allows the regulator to respond quickly and relieve the excessive pressure. |
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T2000 Explosion Proof I/P & E/P Transducers The T2000EX is a robust electronic instrument that regulates an incoming supply pressure down to a precise output pressure which is directly proportional to an electrical control signal. The secret to the T2000EX’s precise, reliable performance under a variety of demanding environmental conditions is a patented piezo-ceramic actuator with many industry-wide firsts. |
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Type M1R & M2R Miniature Regulators The Type M1R Miniature Air Regulator is a compact, low cost regulator, which operates in output pressure ranges up to 120 psi, with a maximum supply pressure of 145 psi. The TypeM1R is available in 1/8" and 1/4" NPT port sizes. With a flow of up to 40 SCFM and low droop the M1R provides the features of a large regulator in a small package. The Type M2R Air Regulator is a mid-sized version of the M1R Miniature Air Regulator. Lakethe M1R this is a low cost regulator with output ranges up to 120 psig with a maximum supply pressure of 145 psig. The M2R is available in 1/4", 3/8", or 1/2" NPT port size. The TypeM2R can provide flow rates to 90 SCFM.
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In 1950, Bellofram introduced the original rolling diaphragm for a wide variety of industries and applications. Since that time one billion diaphragms have been used successfully throughout the world. Engineering plays a critical role at every level in our manufacturing cycle. From design, tooling completion, to integrating procedures into production processes, is one aspect of total quality commitment. The performance of the rolling diaphragm depends, in large part, on the preparation of materials. Raw materials are accepted after close scrutiny and absolute conformity to tight specifications. Elastomers are compounded with extreme care, then coded to ensure complete batch traceability. Reinforcing fabrics are woven or knitted to specifications developed exclusively by Bellofram. Meticulous performing practices help to ensure a permanent, high strength bond between elastomers and fabric. |
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For more than 140 years, the Marsh name has been known for quality instrumentation throughout the world. Originally founded in 1865, Marsh Instruments was known as the James. Marsh Company located in Skokie, IL. In 1988, Marshalltown Instruments was added to the line to allow Marsh Instruments to manufacture a complete selection of pressure gauges and thermometers. With over 215 years of combined experience, the product line has developed into the most comprehensive gauge line in the world. Our pressure gauges are used in countless applications where accuracy, dependability and durability are essential. Whether a standard design, or a specially designed pressure gauge, Marsh Instruments stands ready to provide a precision instrument adaptable to wherever pressure is measured. |
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As a leader in the manufacturing of temperature sensors for over 45 years, TCP has succeeded in building strong working relationships with our customers. Our long history of working closely with our customers has yielded many innovative new ideas. By relentlessly pursuing solutions for the marketplace, TCP has developed several significant innovations. Several of our “firsts” include: Subminiature thermocouple connectors, high pressure wave rings, multi-point thermocouples and color coded ceramic connectors. TCP also designed and patented the exclusive “Knife Edge” design which is used in our “Tube-Temp” thermocouple. The Tube-Temp is the most accurate measurement device for fired heater and industrial boiler tubes on the market. TCP believes that no project is too large or too small. Difficult applications are always welcome. Whether its a standard job or a custom job, TCP will meet your needs. Providing quality products has been, and remains a cornerstone at TCP. We closely follow testing and inspection procedures. In fact, TCP is one of the few companies to perform X-ray inspection on all of our welded junctions. We offer not only hard film, but real time video X-ray as well. Our quality program meets standards that are recognized worldwide. TCP has passed an extensive audit to become ISO-9001:2000 registered. Please Contact Us for the latest Literature |
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For over 80 years, process engineers and machine designers have turned to Automatic Timing & Controls first for reliable control products. These high-performance products are engineered to provide accurate and repeatable operation in all types of industrial environments. Our products play an integral part in countless industries; including food processing, plastics, packaging, water treatment and many OEM applications. The ATC product family has expanded to include 1/16 DIN timers, panel-mounted timers, electromechanical timers, counters, solid state cube and plug-in timers, photoelectric laser sensors, and time delay relays (TDR). Please Contact Us for the latest Literature |
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DigiTec offers the most complete, Customized and Versatile line of Digital Controllers in the industry. Reliability is the most important single factor in choosing a digital controller, and DigiTec's reputation has been built on exactly that. Our products play an integral role in industrial applications including packaging, level flow, weighing, and pumping applications. Tachometers on the WESTCON line are rugged built to convert rotary speed to a linear output voltage. Tachometers are used widely for aviation, marine, mining, oil and gas production plus other demanding applications. Please Contact Us for the latest Literature |
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Entering our fifth decade of business, Diversified Electronics continues the tradition of reliable motor protection & alternating relay products as part of the ATC Automatic Timing & Controls organization. As a leader in solid state control products, Diversified Electronics pioneered the first Phase Monitor Relay designed to protect 3-phase equipment from adverse conditions such as Phase Loss (single phasing), Under Voltage (brown-outs), and Phase Reversal (improper sequence). Long known for engineering expertise, quality at ATC Diversified Electronics starts with the product design. Diversified products are developed using the component technologies. Only manufacturers’ components which have been thoroughly screened and tested by engineering are incorporated. No “equivalent” low cost components are substituted under any circumstances. Compromising on this issue would compromise product reliability. ATC Diversified Electronics offers a wide array of 3-phase Monitor Relays, Alternating and Time Delay Relays. From the inexpensive (and most popular) SLA Series of 8-pin plug-in devices to the more sophisticated Microprocessor-based SLM Series or the latest SLU Universal Phase Monitor, ATC Diversified Electronics has a solution for all 3-phase systems (Delta or Wye). The most recent innovation from ATC Diversified is the UPA130 Universal Power Alert. Mounted in the door of a control panel and wired to the main disconnect or breaker, the UPA130 provides a visual indication of the presence of voltage in the panel. Powered by the same voltage it is detecting, this NFPA 70E compliant safety device helps reduce arc flash and electrocution risks. Please Contact Us for the latest Literature |
