Trunnion Mounted Ball Valves South Africa

KV Controls supplies high-performance trunnion mounted ball valves for critical isolation applications across South Africa. Designed for demanding service conditions, our trunnion ball valves deliver reliable shut-off performance, low operating torque, superior sealing integrity and extended service life in high-pressure systems.

Our range includes the RB Series cast trunnion mounted ball valves and the RC Series forged steel trunnion mounted ball valves, engineered to meet the stringent requirements of oil and gas, petrochemical, mining, power generation, chemical processing and industrial pipeline applications.

Manufactured to internationally recognised standards, these valves provide dependable operation under severe pressure, temperature and process conditions while maintaining bubble-tight sealing performance.

What Is A Trunnion Mounted Ball Valve?

A trunnion mounted ball valve uses a mechanically anchored ball supported by upper and lower trunnions. Unlike floating ball valves, the ball remains fixed while the seats move towards the ball under spring and line pressure.

This design significantly reduces operating torque, improves sealing performance and allows the valve to operate effectively in larger diameters and higher pressure classes.

Trunnion mounted ball valves are widely used in:

• Oil and gas transmission pipelines
• Petrochemical facilities
• Refining operations
• Mining process plants
• Power stations
• Water infrastructure projects
• Chemical processing plants

The design provides excellent reliability where high differential pressures, frequent cycling or large bore sizes are present.

RB Series Trunnion Mounted Ball Valves

The RB Series is a two-piece body trunnion mounted ball valve designed in accordance with API 6D requirements and fire-tested to API 6FA standards. The valve incorporates spring-loaded seats that ensure reliable sealing performance under both low and high differential pressure conditions.

Key features include:

• Two-piece body construction
• Trunnion mounted ball design
• Fire-safe construction
• Blowout-proof stem
• Anti-static design
• Emergency sealant injection system
• Double Block and Bleed capability
• Full bore and reduced bore options
• Low operating torque
• Carbon steel and stainless steel materials
• Sizes from DN15 to DN600
• Pressure classes up to ASME Class 600

The RB Series is particularly suited for oil and gas pipelines, petrochemical facilities and large industrial isolation applications where operational reliability is critical.

RC Series Forged Steel Trunnion Mounted Ball Valves

The RC Series is a premium forged steel trunnion mounted ball valve developed for severe service applications where enhanced strength and reliability are required.

Unlike cast body designs, the forged steel body and bonnet construction minimise casting defects and provide superior mechanical integrity under full differential pressure conditions. The valve is designed according to API 6D requirements and fire-tested to API 6FA standards.

Key advantages include:

• Three-piece forged steel construction
• Trunnion mounted ball
• Fire-safe design
• Blowout-proof stem
• Anti-static protection
• Emergency seat and stem sealing systems
• Pressure relief options
• Double piston effect seat design
• Double Block and Bleed functionality
• High-pressure capability
• Low operating torque
• Excellent performance in severe service environments

The RC Series is ideal for critical process isolation in oil and gas production, petrochemical facilities, mining operations and high-pressure process systems.

Key Features Of KV Controls Trunnion Ball Valves

Double Block And Bleed (DBB)

Double Block and Bleed functionality allows the valve cavity to be isolated and safely vented for maintenance or testing purposes. This feature is widely used in oil and gas applications where maximum safety is required.

Fire Safe Design

Both RB and RC Series valves incorporate fire-safe sealing systems designed to maintain sealing integrity in the event of fire, conforming to recognised international standards including API 6FA and API 607.

Anti-Static Protection

Integrated anti-static devices safely dissipate static electricity generated during valve operation, reducing the risk of ignition in hazardous environments.

Blowout-Proof Stem

The stem design prevents accidental stem ejection under pressure, providing enhanced safety and reliability in critical process applications.

Emergency Sealant Injection

Emergency sealant injection systems allow temporary sealing of seats and stems should damage occur, minimising downtime and maintaining operational continuity.

Industries And Applications

KV Controls trunnion mounted ball valves are used throughout South Africa in:

• Mining and mineral processing
• Oil and gas facilities
• Petrochemical plants
• Refineries
• Power generation
• Water treatment facilities
• LNG and natural gas systems
• Bulk fluid transportation pipelines
• Chemical manufacturing plants

Available Materials And Configurations

Available options include:

• Carbon Steel
• Stainless Steel 304
• Stainless Steel 316
• Full Bore Designs
• Reduced Bore Designs
• Manual Operation
• Gear Operated Valves
• Pneumatic Actuation
• Electric Actuation
• Flanged Ends
• Butt Weld Ends
• Special Seat Materials

Why Choose KV Controls?

KV Controls provides industrial valve solutions backed by technical expertise, application support and reliable product availability throughout South Africa.

Our trunnion mounted ball valves are selected to meet the requirements of severe industrial applications where safety, reliability and long-term performance are essential.

Whether you require a standard pipeline isolation valve or a custom-engineered severe service solution, our team can assist with product selection, technical specifications and quotation support.

FAQ SECTION

What is a trunnion mounted ball valve?

A trunnion mounted ball valve uses a fixed ball supported by trunnions, reducing operating torque and improving sealing performance in high-pressure applications.

What is the difference between a floating ball valve and a trunnion ball valve?

Floating ball valves rely on line pressure to force the ball against the seat. Trunnion ball valves use a mechanically supported ball and floating seats, making them suitable for larger sizes and higher pressures.

What is Double Block and Bleed?

Double Block and Bleed (DBB) allows both upstream and downstream isolation while venting the cavity between sealing surfaces for maintenance or testing.

Are trunnion mounted ball valves suitable for oil and gas applications?

Yes. Trunnion ball valves are widely used in oil and gas pipelines, petrochemical plants and refinery applications because of their reliability and high-pressure capabilities.

What standards do KV Controls trunnion mounted ball valves comply with?

RB and RC Series valves are designed according to API 6D requirements and fire-tested to API 6FA standards.