Product Overview

The High Pressure Forged Steel Trunnion Mounted Ball Valve is engineered for critical isolation service in high-pressure, high-temperature, and severe operating environments such as oil & gas transmission, refinery processing, LNG systems, and power generation pipelines.
Unlike floating ball valves, the trunnion-mounted design mechanically supports the ball at both upper and lower stems, ensuring stable sealing performance, significantly reduced operating torque, and long service life under high differential pressure conditions.

Technical Specifications

Parameter	Specification
Size Range	2" to 48" (DN50 to DN1200)
Pressure Class	ASME Class 150 to Class 2500 (PN16 to PN420)
Design Standards	API 6D, API 608, ASME B16.34, ISO 17292
Fire Safety	API 607 / API 6FA
Leakage Performance	API 598 / ISO 5208 Rate A (soft seat bubble-tight)
Fugitive Emission	ISO 15848-1 compliant designs available
Sour Service	NACE MR0175 / ISO 15156 compliant materials

Forged Steel Body – Engineering Integrity Advantage

All pressure-containing components are manufactured from forged steel rather than cast steel, which significantly improves structural reliability in high-pressure service.
Engineering Benefits (Verified Industry Practice):

Elimination of internal casting defects such as porosity, shrinkage cavities, and gas inclusions
Improved grain structure density, increasing resistance to fatigue and pressure cycling
Higher impact toughness, suitable for low-temperature (down to -46°C) applications
Better performance under thermal shock and cyclic loading conditions

Common Material Grades:

ASTM A105 – General high-pressure carbon steel service
ASTM A350 LF2 – Low-temperature pipeline applications
ASTM A182 F304 / F316 – Corrosive chemical and refinery environments

Trunnion Mounted Design – Low Torque & High Stability

The trunnion-mounted structure mechanically fixes the ball at both ends, preventing excessive movement under pressure.
Key Performance Advantages:

Lower operating torque (up to 70% reduction vs floating design)
Stable sealing under high differential pressure (ΔP)
Reduced seat wear and longer service life
Suitable for large diameter pipelines (DN150 and above)
Compatible with smaller actuator sizing → lower total installed cost (TIC)

Sealing System & Safety Features

Energized Seat Design
Spring-loaded seat rings maintain continuous contact with the ball, compensating for pressure variation and thermal expansion.

PTFE / RPTFE – General industrial service
PEEK / Nylon – High temperature and high pressure service
Metal seated (Stellite / Tungsten Carbide) – Abrasive or severe service conditions

Blowout-Proof Stem Design
The stem is internally retained and engineered to comply with API 6D anti-blowout requirements, ensuring operator safety under extreme pressure surges.

Anti-Static System
Integrated grounding components ensure electrical continuity between ball, stem, and body, preventing static discharge risks in high-velocity flow conditions.

Quality Assurance & Manufacturing Standards

Each valve is manufactured under strict industrial quality systems aligned with international EPC requirements.
Certifications & Testing:

API 6D pipeline valve certification
ISO 9001 quality management system
Hydrostatic and shell pressure testing (API 598)
Fugitive emission testing (ISO 15848-1 available upon request)
Material traceability (MTC 3.1 / 3.2)

Industry Applications

These valves are widely used in high-consequence industrial systems, including:

Cross-country oil & gas transmission pipelines
Refinery units (hydrocracking, reforming, desulfurization)
LNG liquefaction and regasification terminals
Offshore platform injection systems
Gas compressor stations and metering skids
High-pressure steam and feedwater systems in power plants

Engineering Project Experience

This valve type is commonly selected for EPC and energy infrastructure projects in:

Middle East oil & gas pipeline systems
Southeast Asia LNG terminal developments
European refinery modernization projects
North American high-pressure gas transmission systems

Actuation & Automation Compatibility

All valves are equipped with ISO 5211 mounting pads, allowing direct integration with:

Pneumatic actuators
Electric actuators
Hydraulic / electro-hydraulic ESD systems

This enables full automation in SCADA-controlled pipeline networks.

Commercial Information

Supply capability	OEM / ODM available
Lead time	Typically 4–10 weeks depending on specification
Inspection	Factory acceptance test (FAT) supported
Packaging	Export-grade seaworthy packing
Global delivery	Europe / Middle East / North America / Southeast Asia

FAQ

Q: Why choose trunnion ball valves for high-pressure pipelines?

A: Because trunnion design significantly reduces operating torque and prevents excessive seat deformation under high differential pressure, making it suitable for large-diameter, high-pressure systems.

Q: What is the advantage of forged steel over cast steel?

A: Forged steel has a refined grain structure and eliminates internal casting defects, providing higher mechanical strength, fatigue resistance, and reliability under cyclic pressure conditions.

Q: Can these valves be used in sour gas service?

A: Yes. When manufactured according to NACE MR0175 / ISO 15156, they are suitable for H₂S-containing environments with controlled hardness materials to prevent sulfide stress cracking.

Q: Do you provide third-party inspection?

A: Yes. Inspection by TÜV, SGS, or BV is available upon customer request during production or final testing.

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