Three-Piece Trunnion-Mounted Ball Valves

Product Specifications

Achieving a leak-tight closure is critical in oil and gas operations. Because of their robust anchoring design, MLB’s trunnion-mounted ball valves are uniquely engineered to excel in large-scale, high-pressure environments. The trunnion-supported stems effectively absorb line pressure, which minimizes friction between the ball and the seats. This significantly lowers operating torque, even under maximum pressure conditions.

We engineer and manufacture our entire lineup of two-piece and three-piece trunnion ball valves to meet strict quality and design benchmarks. As a standard safety feature, these valves include a secondary emergency sealant injection system, allowing operators to create a temporary backup seal if primary sealing surfaces suffer damage. Additionally, MLB utilizes a broad selection of certified, high-grade materials specifically chosen to prevent sulfide stress cracking and withstand highly corrosive environments. Proper material selection is vital to mitigate the combined impacts of total system pressure, operating temperatures, and exposure to elemental sulfur or chlorides.

The entire MLB product line is built for straightforward field maintenance and supports a variety of custom configurations, including stem extensions, locking mechanisms, transition piping, and direct-mount actuator integration.

Key Features & Specifications:

Available Models: 50C Series and 50F Series

Size Range:
2 inches to 60 inches

Pressure Ratings: ANSI Class 150 to 2500

Design Compliance: API 6D Standards

End Connections: Flanged, butt-weld, or combination flanged-by-weld configurations

Standard Body Material: Forged carbon steel (ASTM A350 LF2 & ASTM A105N)

Bore Configurations: Full port or reduced port options

Safety Certifications: NACE compliance (corrosion resistance) and fire-safe certified design

Bearing Type: High-endurance, self-lubricating steel bearings.

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