API 6D Trunnion Ball Valves

Short Description:

API 6D: Specification for Pipeline Valves. API 6D specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems.

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Key Specifications / Features

A trunnion mounted valve means that the ball is constrained by bearings and is only allowed to rotate, the
majority of the hydraulic load is supported by the System constraints, resulting in low bearing pressure and no shaft fatigue. The line pressure drives the upstream seat against the stationary ball so that the line pressure
forces the upstream seat onto the ball causing it to seal.

API 6D: Specification for Pipeline Valves. API 6D specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems.

API 6D trunnion ball valves have a secondary sealant injection system for stem seals and seats in the event of providing a temporary seal to an otherwise damaged area. The trunnion ball valve design using the upper and lower trunnion plate system essentially doubles the safety and reliability of a standard trunnion ball valve.

Ball valves designed to meet API 6D shall be tested to API 6D. API 6D has longer test duration compared to API 598.

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