Masoneilan 535V-50 Differential Pressure Microflow Regulator
Overview
The Masoneilan 535V-50 is the differential pressure regulator of the Masoneilan microflow range from Baker Hughes. It combines the single-seat microflow body of the 535V with a differential actuator, so that instead of holding one downstream pressure it maintains one pressure in excess of a reference pressure by an adjustable amount. Baker Hughes publishes one instruction manual for the 535V reducing regulator and the Masoneilan 535V-50 together, and the 535H/536H/535V technical specification lists the actuator spring ranges for the differential option separately, which is what makes the 535V-50 a distinct catalogued item.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 535V-50 to laboratories, packaged-skid builders, refineries and gas plants in the Sultanate of Oman and across the GCC. Our instrumentation division in Muscat turns a differential duty, expressed as two pressures and a small flow, into the correct trim number, actuator size and spring range, and provides the Baker Hughes documentation for the unit you order.
Differential Operation of the Masoneilan 535V-50
In the Masoneilan 535V-50 the higher-pressure fluid is piped to the 1/2 inch NPT connection in the upper diaphragm case, which is the chamber where the pressure opposes the spring, and the lower-pressure fluid is piped to the other diaphragm chamber. The adjustable spring of the actuator is set to the required differential and holds the regulator open. When the differential rises above the set point it overcomes the spring and the regulator closes, and when the differential falls the spring opens it again, so the plug position follows the differential continuously.
A needle valve and a gauge go into each of the two sensing lines, close enough together that both valves can be reached at once. The manual explains that the needle valves shut off the control lines and act as adjustable chokes against cycling from pump pulsation, and it carries a warning that pressure must be raised on both sides of the diaphragm at the same time, otherwise the diaphragm can fail. The typical installation diagram shows low pressure and high pressure needle valves, vent valves and an equalizing valve around the regulator, and a three-valve bypass allows the regulator to be removed without shutting off the flow.
Engineering Design of the Masoneilan 535V-50
The Masoneilan 535V-50 uses the standard 28000 Series body with an integral bonnet in ANSI Class 150 to 600 ratings (PN 20 to 100). The plug has linear characteristic and the seat is metal, giving Class IV shutoff. Eight plugs and five seat rings give ten assemblies numbered 0 to 9, with rated Cv of 3.8, 2.3, 1.2, 0.6, 0.25, 0.1, 0.05, 0.025, 0.01 and 0.004, and the 1/2, 3/4 and 1 inch bodies are available with the Cv limits shown in the technical specification. The stainless steel construction is rated from -321°F to 650°F (-196°C to 343°C) with a 316L body, a 17-4 PH seat ring retainer and a carbon-core braided PTFE packing set.
The packing box is protected by a safety pin and packing spacer that stop the plug from being pushed out of the body if the actuator is removed under pressure, and for trims with Cv 0.6 to 3.8 the manual describes a quick packing change that removes the whole actuator without disturbing calibration. Below Cv 0.6 the plug is too fine for that method, and the regulator is disassembled instead.
Key Features
The following points explain why the Masoneilan 535V-50 is chosen for small-flow differential control:
- Differential action keeps one pressure above a reference pressure without a transmitter, controller or air supply.
- Ten trim assemblies reach down to a rated Cv of 0.004, far below the trims of the larger 535H-50 style regulators.
- Low pressure differential actuators in 5 and 4 inch cases cover set ranges from 3 to 125 psi.
- High pressure differential actuators in 5, 4 and 3-1/2 inch cases withstand static pressures up to 1500 psi (103.4 bar).
- A metal seat gives Class IV shutoff and a stainless steel body supports service down to -196°C.
- Stellite No. 6 seat rings and solid Stellite plugs are used on the finest trims, which resist wear at small orifices.
- The safety pin and spacer retain the plug when the actuator is removed.
- A sealed, direct-operated design needs no power supply, which suits skid and remote installations.
Industrial Applications
The Masoneilan 535V-50 is used wherever a small stream must be held at a fixed pressure above or below a reference: purge and bubbler lines referenced to vessel pressure, seal-fluid and barrier-fluid supplies for small pumps and compressors, reactor sampling and injection lines, and test benches that simulate a differential. In Oman these needs appear in gas processing and refinery packages, in laboratory and pilot facilities supporting desalination at Muscat and Salalah, and in fabricated skids built in the Sohar industrial zones.
In Oman and the GCC, Seven Star LLC supplies the Masoneilan 535V-50 with its siblings and with the Masoneilan 172 Series pressure reducing regulator, and we can quote the differential, reducing and back pressure microflow models together so that spares and documentation are standardised. A pressure gauge and needle valve for each sensing line can be quoted with the regulator.
Technical Specifications
The table below summarises the Masoneilan 535V-50 data from the Baker Hughes technical specification and instruction manual.
| Parameter | Specification |
|---|---|
| Model | Masoneilan 535V-50 Differential Pressure (microflow); 535V is the reducing model |
| Service | Steam, gas, liquids |
| Body | Standard 28000 Series body, integral bonnet, ANSI Class 150-600 (PN 20-100) |
| Sizes | 1/2, 3/4 and 1 inch (15, 20 and 25 mm) |
| Characteristic and shutoff | Linear; metal seat, Class IV |
| Trim numbers 0 to 9, rated Cv | 3.8, 2.3, 1.2, 0.6, 0.25, 0.1, 0.05, 0.025, 0.01, 0.004 |
| Travel and stem | 2.54 mm (0.1 in) travel; 7.925 mm (0.312 in) stem |
| Face to face | RF flanged 160 mm (6.30 in); threaded and flangeless 102 mm (4.01 in) |
| Body sub-assembly weight | 5 kg (11.02 lb) for flangeless and threaded bodies; 7.5 to 9.5 kg for flanged bodies depending on class |
| Temperature range | -321 to 650°F (-196 to 343°C), stainless steel construction |
| Low pressure differential actuator | 5 in.: 3-12, 10-35, 30-75 psi; 4 in.: 60-125 psi; 250 psi (17.2 bar) static |
| High pressure differential actuator | 5 in.: 3-15 and 30-85 psi (600 psi, 41.4 bar); 4 in.: 5-30 and 10-60 psi (1000 psi, 69 bar); 3-1/2 in.: 75-185 and 100-330 psi (1500 psi, 103.4 bar) |
The foreword of the Baker Hughes specification names only 3/4 and 1 inch bodies for the 535V, but every data table (body ratings, Cv, dimensions, weights) lists 1/2, 3/4 and 1 inch. Seven Star LLC follows the tables, so the Masoneilan 535V-50 is quoted in 1/2, 3/4 and 1 inch (15, 20 and 25 mm) bodies; the 3.8 Cv trim is limited to the 1 inch body.
Related Masoneilan regulators include the Masoneilan 535V Series microflow regulator, Masoneilan 536V back pressure microflow regulator and Masoneilan 535H pressure reducing regulator.
Request a Quote for Masoneilan 535V-50
To request pricing or technical support for the Masoneilan 535V-50, send a formal RFQ to the Seven Star LLC instrumentation division with the fluid, both controlled pressures, the required differential, the flow rate and the body size and end connection. We confirm the trim number and differential actuator, advise on regional warehouse availability and provide the Baker Hughes datasheet and instruction manual for download from this page. In Oman and the GCC, Seven Star LLC delivers genuine regulators with manufacturer documentation and responsive local support.
Masoneilan control valves and actuator series
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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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