API 6D Trunnion Mounted Ball Valve

Product Introduction

In a trunnion mounted valve the ball is supported on bearings instead of being pressed against the seat by line pressure, which is what keeps operating torque manageable as diameter and pressure rise. This page covers the API 6D trunnion design for large, high-pressure oil and gas lines where seat thrust would otherwise be a handling problem.

Specification Table

Applications and Titanium Advantages

The valve is used for mainline isolation on high-pressure, large-diameter oil and gas transmission pipelines. Project buyers typically have to demonstrate double block and bleed capability and a workable operating torque, and both depend on the seat design, the bearing arrangement and the material selection rather than on the valve description alone.

• Bearing-supported ball rotation keeps operating torque low, so large valves can be handled without oversized actuation.
• API 6D compliance supports mainline pipeline project documentation and acceptance.
• The design is intended for large-diameter, high-pressure service where seat thrust would be excessive in a floating design.

Quality and Purchasing Information

Confirm the size, pressure class, end connection, material grade, medium, whether double block and bleed is required, the actuation method and the torque available at site. Tibars reviews the duty against the trunnion design offered and confirms the seat arrangement and tested features in writing.

• State the grade, size, tolerance, quantity and delivery condition of this trunnion mounted ball valve at enquiry stage so pricing can be issued without re-quoting.
• Ask for the mill test certificate and any inspection records that the project requires for this trunnion mounted ball valve, and confirm them against the purchase specification.
• Engineered or non-standard this trunnion mounted ball valve can be reviewed from a drawing together with the working medium and operating conditions.

Request a Quotation

Send the size, pressure class, end connection, medium, double block and bleed requirement and quantity, and Tibars will quote this API 6D trunnion mounted ball valve with the applicable test documents.