Masoneilan 8013 Series Electro-Pneumatic Cam Valve Positioner (8012/8013)
Overview
The Masoneilan 8013 is the European-design member of the Baker Hughes 8012/8013 Series of electro-pneumatic cam valve positioners. It takes a DC current signal from an electronic controller, compares it with the true position of the valve plug and adjusts the air pressure sent to the actuator until the two agree. Baker Hughes describes the series as a force-balance device with excellent dynamic response and positioning accuracy, and the same family includes the 8012, the US design supplied with FM approvals, while the Masoneilan 8013 carries ATEX, CCOE and IA approvals for hazardous areas.
Seven Star LLC is the trusted supplier for Masoneilan in the Sultanate of Oman and supplies the Masoneilan 8013 and 8012 positioners, together with the actuators and valves they are mounted on, to plants across the GCC. Because the numbering system encodes the actuator, cam and approval, our Muscat team can identify the correct model code from an existing nameplate and confirm a replacement before an order is placed.
Operating Principle of the Masoneilan 8013
The Masoneilan 8013 works by balancing forces on a beam. A change in the controller signal passes through a coil and magnet system, and the coil produces a force on the beam that moves a flapper toward or away from a nozzle. The resulting change in nozzle back pressure drives a high-capacity pilot, which raises or lowers the output pressure to the actuator. In direct action an increase in the electrical signal increases output pressure, and in reverse action it decreases it.
The valve position is fed back mechanically. Plug motion is carried through the positioner lever to a force-balance spring, and the spring acts on the beam against the coil force. When the two forces are equal the system is in equilibrium and the output pressure settles at the level needed to hold the plug in place, with a small deliberate bleed between supply and output that keeps the pilot responsive. In theory no air flows into or out of the pilot at that point, which is why steady-state consumption stays low.
Engineering Design of the Masoneilan 8013
The cast aluminum case of the Masoneilan 8013 is fixed to a mounting plate and a molded support. Inside, beryllium copper flexure bearings carry the beam without friction at its fulcrum points, the pilot has a metering tube fitted with a clean-out plunger, and the coil is impregnated with an insulating material. A flame arrestor protects the nozzle circuit, and the 8013 numbering includes explosion-proof and intrinsically safe versions, for which Baker Hughes refers installers to its 8000 ATEX manual.
The cam is the characteristic feature. Only one multi-lobe cam is fitted, and the chosen lobe gives linear, linear split-range or equal-percentage control. The cam is mounted directly on the end of the plug shaft of a rotary valve or on the stem of a reciprocating actuator, so the usual linkage and its backlash are essentially eliminated. Zero is set with a vernier screw, and span is set by adjusting the tension of the force-balance spring.
Key Features
The following points explain why the Masoneilan 8013 remains specified for pneumatic actuators that are driven by an electrical signal:
- The Masoneilan 8013 uses one multi-lobe cam, which provides field-changeable linear or percentage characteristics without additional parts.
- The 8013 can be supplied for direct action or reverse action, so a rising signal can open or close the valve.
- Two control valves can be operated in sequence from one controller output by split-ranging the signal.
- Beryllium copper flexure bearings remove friction from the beam fulcrum and support good positioning accuracy.
- A high-capacity pilot gives fast stroking speeds, and its metering tube has a clean-out plunger for maintenance.
- The input circuit can be adapted to most DC current signals, including 4-20 mA, 1-5 mA and 10-50 mA.
- Low temperature instruments are available for service down to -55 degC, against -20 degC for the standard instrument.
- Mounting codes cover 37/38 and 87/88 actuators, Camflex II, Sigma F, Minitork II, 36000 ball valves, HPBV, Varipak and V-Max.
Industrial Applications
The Masoneilan 8013 suits pneumatic actuators in refineries, gas processing, power and water plants where the controller output is a current signal and a robust mechanical positioner is preferred to a software-configured one. Typical installations are Camflex II rotary-plug valves, Minitork II butterfly valves and multi-spring diaphragm actuators on globe valves, including established plants around Sohar, Salalah and Duqm, where a replacement positioner has to match the original mounting and cam.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 8013 with the valves and actuators it is fitted to, such as the Masoneilan Type 87/88 spring-diaphragm actuators and the Masoneilan Camflex rotary control valve. Sites that are ready to move to digital diagnostics can compare it with the Masoneilan SVI3 digital valve positioner, and our engineers will recommend whichever positioner fits the loop.
Technical Specifications
The table lists the published data for the Masoneilan 8013 and its 8012 counterpart from the Baker Hughes fact sheet. Performance figures are average values in percent of the input span for Camflex II, Minitork II and 87/88 multi-spring actuators with a standard 8013.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 8013 (European design, ATEX, CCOE and IA) and 8012 (US design, FM) |
| Input signal | DC current; typical circuit resistance 216 ohm at 4-20 mA |
| Input resistance | 1-5 mA: 2753 ohm (8013); 4-20 mA: 216 ohm (8013), 173 ohm (8012); 10-50 mA: 105 ohm (8013), 104 ohm (8012) |
| Air supply | 1.4 to 5.2 bar (20 to 75 psi), depending on valve size and actuator action |
| Steady-state consumption | 0.40 st.m3/h at 1.4 bar, 0.55 at 2.4 bar, 0.85 at 5.2 bar |
| Maximum air output | 4.5 st.m3/h at 1.4 bar, 8.0 at 2.4 bar, 18 at 5.2 bar |
| Supply pressure influence | 0.3 to 0.7 percent of output pressure per 100 mbar change |
| Hysteresis at mid stroke | 0.8 percent maximum |
| Sensitivity | 0.3 percent maximum |
| Ambient temperature | Standard down to -20 degC; low temperature down to -55 degC |
| Air connections | 1/4 inch NPT supply and output |
| Adjustments | Zero by vernier screw; span by force-balance spring tension |
| Weight | 3.5 kg (7.5 lb) |
| Approvals | 8013-55 weather-proof; 8013-57 explosion-proof; 8013-58 intrinsically safe |
Related Masoneilan positioners and instruments include the Masoneilan 4700P/4800P pneumatic positioner, Masoneilan 4700E/4800E electropneumatic positioner and Masoneilan 4411 I/P transducer.
Request a Quote for Masoneilan 8013
To request pricing or technical support for the Masoneilan 8013, send a formal RFQ to the Seven Star LLC instrumentation division with the model code from the nameplate, the valve or actuator it is mounted on, the signal range and the hazardous area approval you need. We can confirm the numbering, advise on availability and lead time and provide the Baker Hughes fact sheet from this page. In Oman and the GCC, Seven Star LLC supplies genuine instruments with manufacturer documentation and local engineering support.
- Datasheet Masoneilan 8012/8013 Positioner Fact Sheet Download
Masoneilan control valves and actuator series
The globe valve listing centers on the 21000 series, including the cryogenic version with extension bonnet, and the 41005 cage-guided series in high pressure, API 6A and VRT anti-cavitation executions. The 80385 and 80386 are three-way combining and diverting valves. Rotary products include the 35002 Camflex II and the 37002 MiniTork II butterfly control valve. Actuators cover spring-diaphragm, cylinder and rack-and-pinion designs, among them the 5A cylinder actuator for Camflex II. Masoneilan also makes pressure regulators, SVI digital valve positioners and displacer-type level instruments, and offers Lo-dB trim for noise control.Where Masoneilan valves are used
Throttling duty on steam, hydrocarbons, gas and water is the daily work of these valves: feedwater and steam conditioning in power plants, separator and compressor loops in gas processing, high pressure drop letdown, cryogenic service in LNG and air separation, and general flow, pressure and level control in refineries and chemical plants.Ordering Masoneilan valves and spare parts: what we need
For spare parts the serial number is decisive, since the factory record behind it lists trim, materials and actuator. Send a clear nameplate photo with serial number, model number, size and pressure class. For a new valve add the process data: fluid, inlet and outlet pressure, temperature, minimum, normal and maximum flow, required leakage class, fail position, air supply and control signal.Browse Masoneilan products by category: Control Valves, Valve Actuator, Regulators, Valve Positioner, Level Transmitter.
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