KOSO Kent Introl Vietnam
Severe Service Control & Choke Valves

About KOSO Kent Introl

KOSO Kent Introl Ltd (KKI) is a British severe-service valve manufacturer founded in 1967 in Brighouse, West Yorkshire. Over more than five decades it has built a global reputation for control valves and choke valves that perform reliably in the harshest process conditions – high pressure drops, flashing, cavitation, erosion and high noise. Since 2005 the company has been part of the KOSO Group of Japan (Nihon KOSO Co. Ltd), a worldwide network of around ten companies across nine countries, giving Kent Introl global reach and manufacturing strength while retaining its UK engineering heritage.

Kent Introl pioneered multi-stage low-noise trim technology, the Turbotrol and Rotrol anti-cavitation designs, and the VeCTor labyrinth velocity-control trim. It was the first control-valve company accredited to ISO 9001, has supplied subsea valves since the 1980s qualified to 2,200 metres water depth, and in 2026 was awarded Fit For Nuclear (F4N) status. Its valves are specified by operators including BP, Shell, ExxonMobil, Aramco, Petronas, Petrobras and Equinor.

Why Engineers Choose Kent Introl

Choke Valves

Kent Introl choke valves are engineered for the most severe oil & gas service, with a wide choice of materials, anti-erosion trims and sizes. The range pairs the proven Series 73 surface choke with fully bespoke engineered solutions, all backed by fast technical support.

Advanced Surface Choke – Series 73

Severe-service surface choke trusted in oil and gas for 45+ years, with single or multi-stage anti-erosion trims.

Specialist Engineered Solutions

Bespoke chokes built to project needs – bi-directional, in-line, low-shear, high-sand and HP chemical injection.

Globe Control Valves

Kent Introl’s high-performance globe control valve range spans cage-guided, single-seated, double-seated and three-way diverting designs for oil & gas, petrochemical, power and manufacturing. All can be fitted with specialised trims to manage noise, cavitation and erosion.

Cage-Guided – Series 1200 / 7200

Critical-service cage-guided globe valve with high rangeability and severe-service trims; 7200 is the angle version.

Single-Seated – Series 10 / 71

Top-guided single-seated globe valve giving high capacity with tight shut-off and no debris-trapping guide.

Double-Seated – Series 20

High-capacity double-seated globe valve for medium/low-pressure service; HF trim option handles high drops.

Three-Way – Series 30 / 31 / 32

Three-way globe valve for accurate proportional mixing or diverting of flows at high capacity.

Butterfly Control Valves

The high-capacity Introseal butterfly control valve range is a lighter, more compact alternative to globe valves while still protecting against noise and cavitation at high pressure drops – rated to 800 degrees C and 150 bar, with the patented Rotrol anti-cavitation vane for severe service.

Series 63 – Soft Seat

Soft-seat butterfly valve giving Class VI 100% shut-off, for flow control or isolation in demanding service.

Series 64 – Metal Seat

Metal-seat butterfly valve for high-temperature service up to 600 degrees C; leakage Class IV.

Series 65 – Firesafe

Firesafe butterfly valve with a back-up seat that keeps it sealed and operable after a fire.

Series 66 – High Temperature

Seatless butterfly valve for flow control to 800 degrees C and 150 bar where some leakage is acceptable.

Subsea Solutions – Series 75

Kent Introl has supplied subsea valves since 1967. The Series 75 range covers subsea choke and control valves for single or multi-phase production and seafloor processing, engineered for HPHT, deep-water and high shut-in conditions, and backed by intervention tooling and field support.

Subsea Choke Valve – Series 75

HPHT subsea choke for production, injection and gas lift; retrievable designs proven in deep water.

Subsea Control Valve – Series 75

Modulating subsea valve for seafloor processing – seawater injection, boosting, level control and anti-surge.

Intervention Tools (IWOS)

Modular running tool for safe install and retrieval of subsea valves; co-developed with Subsea 7.

Subsea Services & Support

Full-lifecycle support – API 6A Annex J refurbishment, SIT, offshore intervention and hyperbaric testing.

Instruments

To complete every control loop, Kent Introl supplies the supporting valve instruments – positioners, airsets, filter regulators, volume boosters and airlocks – selected to perform reliably in hostile and offshore environments.

Valve Positioner – P3300 / P3300i

Pneumatic and electro-pneumatic positioners that move actuators per the control signal; vibration-tough.

Air Filter / Airset – Series A

Lightweight, durable Series A airsets for control valves and actuators in hostile environments.

316 SS Filter Regulator

Stainless combined filtration and pressure regulation for compressed air in offshore, food and pharma use.

Volume Booster – Series 1000 / 3000

1:1 pneumatic volume boosters that increase actuator stroking speed and flow capacity.

Airlock – PA Series

PA Series airlocks lock diaphragm-chamber pressure when supply air drops below a set value.

Actuators

Kent Introl pneumatic actuators are matched to its control valves for smooth, accurate and responsive operation – from low-friction rolling-diaphragm units to high-thrust piston designs with air-fail action.

Series G – Diaphragm

Spring-opposed diaphragm actuator using a low-friction involute rolling diaphragm.

Series C – Spring-Return Piston

Spring-return piston actuator in a honed cylinder for smooth, low-hysteresis travel.

Series D – Double-Acting Piston

Double-acting piston actuator (Series C with seal plate) for extra air-fail thrust.

Also available from Kent Introl on request: Gas, Liquid and Portable Regulators and Axial Flow Control & Isolation valves. Contact Nhan Viet for specifications and selection support.

Severe Service Solutions

“Severe service” arises when pressure drops, flashing, multi-phase flow or contamination create erosion, cavitation, vibration and noise that destroy standard valves. Kent Introl has spent over 40 years engineering trim technologies that bring these conditions under control.

VeCTor Velocity Control Trims

Labyrinth trim that limits damaging velocities for high-temperature, high pressure-drop service.

Multi-Stage Trim Technology

Stages high pressure drops to avoid cavitation, with up to 30 stages of pressure let-down.

Erosive Application Solutions

Tailored valve and material combinations, such as tungsten carbide, to resist erosion in onerous duty.

Dynamic Response Testing

Fast, stable valve and actuator assemblies for applications needing high speed and accuracy.

Noise Reduction

Low-noise solutions that stage pressure drops or divide flows to meet site noise limits.

Real-World Applications

Kent Introl valves solve specific, recurring process challenges across the energy industry. These are some of the applications where their severe-service designs are most often specified.

Anti-Surge – Compressor Recycle

Stable, fast flow control that stops compressors moving toward surge and prevents reverse flows.

Pipeline Surge Relief Control

Controls large surges and reverse flows on long pipelines to prevent damaging pressure spikes.

Pump Minimum Flow Recirculation

Multi-stage trim that stages pressure drops to eliminate cavitation in pump recirculation lines.

Fire Water Deluge System

Severe-service valves for fire water deluge systems that resist cavitation in harsh offshore service.

Separator Level Control

Erosion-resistant valves and trims for separator level control in the oil production process.

Aftermarket Services

Kent Introl’s dedicated aftermarket facility supports valves of any make throughout their lifecycle – from diagnostics and overhaul to upgrades and asset-life extension – mobilised on-site or globally as required.

Valve Diagnostics

Data-driven predictive maintenance that measures in-service valve performance to plan work.

Overhaul & Repairs

Full strip-down, inspection, reassembly and testing of valves on-site or at the Brighouse facility.

Servicing & Maintenance

Planned maintenance and refurbishment from a dedicated aftermarket facility, mobilised globally.

Testing

Gas, tensile, PR2, flow, emissions and fire testing in four in-house bays to international standards.

Upgrades & Spares

Upgrades, retrofits and genuine spares to keep valves fit-for-purpose as conditions change.

Asset Life Extension

Strategies that safely extend the service life of ageing oil and gas installations and equipment.

Training

Tailored hands-on courses, from basic valve construction to advanced sizing and selection.

Industries We Serve in Vietnam

Through Nhan Viet ICS JSC, Kent Introl valves support Vietnam’s energy and process industries with severe-service performance and full local technical support.

Global Certifications & Standards

KOSO Kent Introl manufactures to internationally recognised quality, safety and environmental standards, supporting full compliance for Vietnamese projects and audits.

Why Partner with Nhan Viet ICS JSC

Lead Times, Documentation & After-Sales

Sizing & Selection

Severe-service valve selection depends on accurate process data – pressure drop, flow, fluid, temperature and noise limits. Share your datasheet or process conditions and we will work with Kent Introl’s engineering team to recommend the right body, trim and actuator combination.

Documentation & Compliance

We supply full material certificates, test reports, NACE/NORSOK compliance and dimensional drawings to meet EPC and operator requirements, including API 6A and ATEX/PED documentation where applicable.

After-Sales & Spares

Beyond supply, we connect you to Kent Introl’s aftermarket capability – diagnostics, overhaul, testing, upgrades and asset-life extension – to maximise the return on your installed valves over their full lifecycle.

Frequently Asked Questions