Starlines Highperformance Valves Excel in Extreme Industrial Use

What enables valves in critical industrial applications to endure extreme pressures, temperatures, and corrosive environments? The answer lies in meticulous design, superior material selection, and precision manufacturing. Among these solutions, trunnion-mounted ball valves stand out for their unique structural advantages and exceptional reliability in demanding operating conditions.

Trunnion-mounted ball valves feature a fixed ball and floating seat ring design, where the seat ring moves along the valve axis to achieve sealing. This configuration's key advantage is that the lateral pressure loads on the ball are absorbed by bearings, effectively preventing ball deformation and potential valve leakage.

Under low-pressure conditions, the seat ring maintains sealing through spring force. As pressure increases, hydraulic forces push the seat ring tighter against the ball, enhancing the seal. This self-reinforcing mechanism ensures reliable performance across varying pressure conditions.

Compared to traditional floating ball valves, trunnion-mounted designs offer significant advantages in high-pressure and large-diameter applications. The fixed ball reduces operating torque, allowing for smaller, more cost-effective actuators. Additionally, these valves demonstrate reduced seat ring wear, extended service life, and lower maintenance requirements.

Leading manufacturers offer comprehensive trunnion-mounted ball valve series to meet diverse application needs. Standard offerings typically range from ½" to 36" in size, with pressure ratings covering ASME Class 150 through 2500, plus API 6A 5000 and 15,000 specifications. Multiple material and construction combinations accommodate conditions from cryogenic to high-temperature service, and from corrosive to abrasive media.

Key features of premium trunnion-mounted ball valves include:

• Two-piece ball and stem design: This configuration minimizes the impact of lateral pressure loads on the ball, enhancing reliability and durability.
• Electrical continuity assurance: Certified designs maintain electrical continuity across all metal components, ensuring safe operation in electrostatic discharge environments.
• Three-piece construction: This modular design offers flexibility for various end connection configurations to suit different piping system requirements.

For abrasive media applications, specialized versions feature ball and seat components coated with tungsten carbide and chromium layers, typically starting at 150 microns thickness. Custom solutions can extend coatings to 400 microns, with full compliance to industry standards.

Extended stem designs with thermal insulation and specialized materials maintain ISO 5208 RATE A leakage classification, even under extreme heat. Gas-tested performance ensures reliability in critical applications.

BS6364-compliant designs undergo full testing at -196°C. Extended stems with heat fins isolate sealing components from cryogenic temperatures, ensuring performance in liquefied gas applications.

• Full material traceability to original producers
• Non-destructive testing of critical components
• Comprehensive pressure testing for all units
• Custom performance testing per application requirements

• Oil & Gas: Crude oil, natural gas, refined products, and petrochemicals
• Chemical Processing: Corrosive and hazardous chemical handling
• Power Generation: Steam, water, and fuel system control
• Water Treatment: Potable water and wastewater management
• Mining: Slurry and tailings transportation

• Installation: Verify piping cleanliness, proper alignment, and correct tightening torques before pressure testing
• Maintenance: Regular leak inspections, appropriate lubrication, and prompt repair of any operational issues

• Media characteristics (corrosivity, abrasiveness)
• Operating pressure and temperature ranges
• Connection type (flanged, welded, threaded)
• Actuation method (manual, pneumatic, electric)
• Special certifications (fire-safe, low-emission)

• Smart valve systems with integrated monitoring
• Advanced materials for extreme conditions
• Modular designs for easier maintenance
• Environmentally optimized manufacturing