Brand: Masoneilan

Masoneilan SVI II ESD Digital Valve Positioner with Partial Stroke Test

Name: Masoneilan SVI II ESD Positioner – Datasheet & Price Quote
Brand: Masoneilan

Description

Product Overview

The Masoneilan SVI II ESD positioner (Emergency Shutdown) is an intelligent digital valve positioner designed specifically for emergency shutdown (ESD) and safety valves in process plants. It combines the proven SVI II digital positioner technology with an integrated partial stroke test (PST) capability, allowing the safety valve to be tested without fully closing it.

The positioner performs automatic partial stroke testing of the shutdown valve while keeping the process online, detecting valve faults before they become failures. It is certified for use in safety instrumented systems, with SIL 3 capability in redundant configurations per IEC 61508, and communicates via HART protocol.

Key Features

Intelligent digital valve positioner for ESD and safety valves
Integrated partial stroke testing (PST) with automated test sequences
HART communication with 4-20 mA input
SIL 3 capable in redundant configurations per IEC 61508
Position feedback and travel deviation monitoring
Internal diagnostics for valve and actuator health
High accuracy positioning with low air consumption

Technical Specifications

Model	Masoneilan SVI II ESD
Function	digital valve positioner with partial stroke test for ESD valves
Input	4-20 mA with HART protocol
Safety	SIL 3 capability per IEC 61508 (PST certified)
Accuracy	high accuracy digital positioning (0.5% class)
Diagnostics	integrated valve health monitoring and PST reporting
Manufacturer	Masoneilan (Baker Hughes)

Applications

The SVI II ESD is used on emergency shutdown valves, blowdown valves, vent valves and other safety critical valves in oil and gas, refining, petrochemical and power plants, enabling reliable partial stroke testing without process interruption.

Ordering and Selection

When selecting the Masoneilan SVI II ESD positioner, confirm the valve travel, actuator type, input signal and enclosure classification, because each Masoneilan SVI II ESD is configured for a specific emergency shutdown valve. The Masoneilan SVI II ESD positioner includes the partial stroke test function, and the selected Masoneilan SVI II ESD configuration determines how the test is performed and reported. Our team can help you confirm that the Masoneilan SVI II ESD you select matches your valve, actuator and safety instrumented system requirements.Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

Maintenance and Support

The Masoneilan SVI II ESD positioner provides diagnostics that help maintenance teams plan valve service, and the partial stroke test results should be reviewed regularly. Genuine spare parts and accessories for the Masoneilan SVI II ESD are available through Seven Star LLC, including filters, covers and mounting kits. Contact our team for assistance with the Masoneilan SVI II ESD, and we will confirm availability and lead time for your safety valve project.

Industry Applications and Custom Support

The Masoneilan SVI II ESD positioner is trusted by operations and maintenance teams across oil and gas plants in Oman, the GCC and the wider Middle East region. Our customers select the SVI II ESD positioner for reliability, genuine quality and dependable supply. Seven Star LLC provides custom support including technical selection, quotation and after-sales assistance, and we regularly supply this positioner as part of preventive maintenance programs and shutdown packages. Whether you need a single unit or a complete set for a project, our team supports procurement and inspection.

The SVI II ESD positioner combines the digital positioner function with the emergency shutdown logic, and the partial stroke test verifies the valve movement without interrupting the process.

The positioner feedback and the HART communication support the remote monitoring of the valve position and the partial stroke test result.

Why Seven Star LLC?

Seven Star LLC supplies genuine Masoneilan positioners and control valve accessories to customers in Oman and the GCC. We verify model codes and safety certifications, supporting your safety instrumented systems with genuine components.

Our engineers help you verify the exact model and revision before ordering, avoiding costly mismatches.

SVI II ESD Selection Checklist

An emergency shutdown positioner forms part of a safety function, so selection should follow the safety requirements specification of the loop rather than a like-for-like part swap alone. Confirm:

The valve type (on/off ball, butterfly or globe), the actuator type (spring-return or double-acting) and its fail action.
The required partial stroke test travel and test interval, as defined in the SIL verification for the safety instrumented function.
The input signal and HART requirements of the logic solver and asset management system.
The hazardous area certification, enclosure and cable entries required at the valve location.
The mounting kit to suit the actuator, whether rotary or linear.

Installation and Commissioning

Mount the positioner with the correct mounting kit and check the feedback linkage alignment before applying air. Supply clean, dry instrument air at the pressure required by the actuator. Run the automatic calibration to set the stroke ends, then prove a full stroke of the valve under controlled conditions with operations present. Perform a first partial stroke test and store the result as the baseline signature, so later tests can be compared against the as-commissioned valve behaviour. Finally, confirm the shutdown action from the logic solver moves the valve to its safe position within the specified time.

Interpreting Partial Stroke Test Results

The value of partial stroke testing comes from trending the results. Watch for these changes against the baseline:

Increased breakaway pressure or delayed movement, which can indicate packing friction or a sticking valve
Reduced travel or a test that aborts before the target travel is reached
Changes in actuator pressure behaviour that suggest air leaks or spring problems

A degrading trend should be reported to the safety team and planned into the next maintenance window. It must not simply be reset.

Applications in Oman and the GCC

Oil and gas production facilities, gas plants and refineries in Oman and the GCC operate many shutdown and blowdown valves that must remain proven between turnarounds. The SVI II ESD positioner allows these valves to be tested online, which supports longer run times without reducing the integrity of the safety function.

Working with Seven Star LLC

Seven Star LLC supplies Masoneilan positioners, mounting kits and accessories. Provide the valve and actuator data sheet, and we will confirm the correct configuration and certification before supply.

Request a Quote for Masoneilan SVI II ESD Digital Valve Positioner with Partial Stroke Test

For the SVI II ESD positioner or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your valve size, actuation and process data, and our specialists will respond with a detailed commercial proposal and the official SVI documentation.

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About brand

Masoneilan is a control valve brand of Baker Hughes with roots going back to 1882. Its Camflex eccentric plug rotary valve, 21000 series globe valve and SVI digital positioners are fixtures in refineries, gas plants and power stations. Every valve carries a serial number and a long model number that define the actuator, body and trim.

Seven Star LLC is an independent supplier listing Masoneilan control valves, actuators, regulators, positioners and level instruments for buyers in Oman and the GCC. We source complete valves as well as Masoneilan spare parts against that nameplate data.

Masoneilan at a glance

Origin	Mason Regulator Company, Boston area, USA (1882). It acquired the Neilan Company of California in 1931, and the two names became Masoneilan.
Ownership	Dresser Industries from 1985, then GE Oil & Gas, now Baker Hughes
Milestones the company cites	Cv flow coefficient introduced (1944), spring-diaphragm actuators (1955), Camflex rotary globe valve (1968), Lo-dB low-noise trim (1975), LincolnLog axial-flow letdown valve (1982), Varipak (1984), V-Log (1998), SteamForm steam conditioning valve (2002)
Product families	Globe, rotary, butterfly and severe-service control valves, actuators, digital positioners, self-operated regulators and displacer level instruments
Typical duty	Throttling control of steam, gas, hydrocarbons and water, high-pressure letdown, anti-cavitation and low-noise service

Masoneilan control valves and actuator series

Series	Type	Typical use
21000, 21009	Top-guided and cage-guided globe valves	General process control. Cryogenic (21000 C), bellows seal (21000 BS) and API 6A versions are also made
41005	Cage-guided globe valve	Higher pressure drop and larger sizes, up to 30-36 inch extended sizes; VRT anti-cavitation and API 6A versions
35002 Camflex II	Eccentric plug rotary control valve	Erosive, flashing and dirty service; HC high capacity, DVD low noise and GR globe replacement versions
37002 MiniTork II, 39003/39005, 33000	Butterfly control valves, high-performance and triple-offset	Large flows at low pressure drop, and tight-shutoff duty
28000 Varipak	Microflow control valve	Very small flows, with adjustable Cv
78400/18400 LincolnLog, 77000, 49000 V-Log	Severe-service multi-stage valves	High-pressure liquid letdown, anti-cavitation and gas noise reduction
84000/84003 SteamForm, DSH	Steam conditioning valves and desuperheaters	Turbine bypass and steam pressure and temperature reduction
87/88, 37/38, 51/52/53	Spring-diaphragm and piston actuators	Linear and rotary valve actuation; diaphragms and soft-goods kits are listed separately
SVI3, SVI II AP, SVi1000, SVI FF	Digital valve positioners	HART or FOUNDATION Fieldbus positioning with valve diagnostics; the SVI II ESD adds partial stroke testing
4700/4800, 8013	Pneumatic and electro-pneumatic positioners	Older installed base. Many sites move to SVI positioners at overhaul
525/526, 535/536, 171-174	Self-operated pressure regulators	Pressure reducing and back-pressure control without external power
12400, 12800	Displacer level transmitters and controllers	Digital (12400, HART, SIL 2 version 12420) and pneumatic (12800) level control on separators and vessels

Where Masoneilan valves are used

Throttling duty on steam, hydrocarbons, gas and water is the daily work of these valves. Typical services are 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 decides the order, because the factory record behind it lists the trim, materials and actuator. Send a clear nameplate photo with the 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. When an older positioner or valve series is no longer made, we quote the successor that Baker Hughes names and list the mounting kit it needs.

Facts checked against Baker Hughes Masoneilan product information and the company's published timeline, October 2026.

Browse Masoneilan products by category: Control Valves, Valve Actuator, Regulators, Valve Positioner, Level Transmitter.

FAQ

Questions about the Masoneilan SVI II ESD Digital Valve Positioner with

Answers from our engineering team on installation, compatibility and integration.

01What is the Masoneilan SVI II ESD?

It is an intelligent digital valve positioner with integrated partial stroke testing for emergency shutdown valves.

02What is partial stroke testing?

PST moves the safety valve through a partial travel range to verify it operates correctly without fully closing the process line.

03Is the SVI II ESD certified for safety applications?

Yes, it is SIL 3 capable in redundant configurations per IEC 61508.

04What communication protocol does it use?

It uses 4-20 mA with HART communication protocol.

05What details should I include in my inquiry for the SVI II ESD positioner?

Send the part number, your system details and the required quantity through the RFQ page. Seven Star LLC confirms the exact configuration, the matching accessories and the commercial terms for your project.