Question 1

What is a bolted body trunnion ball valve?

Accepted Answer

It is a trunnion-mounted ball valve where the body is joined by high-strength bolts instead of welding. This allows field disassembly to inspect or replace seats, seals, and the ball without cutting the line, maintaining structural integrity for pressures up to ANSI 2500.

Question 2

What are the advantages of bolted body for field maintenance?

Accepted Answer

Bolted body allows field disassembly without pipe cutting or hot welding, reducing downtime and maintenance costs. Seat and seal replacement is done in hours instead of days, which is critical in refineries and process plants where unplanned shutdowns cost millions.

Question 3

What configurations exist for bolted trunnion valves?

Accepted Answer

There are two main configurations: 2-piece (side entry) for standard maintenance, and 3-piece for full access to internals without removing from the line. The choice depends on available space and required maintenance frequency.

Question 4

What standards apply to bolted trunnion valves?

Accepted Answer

The main standards are API 6D for pipeline valve design and testing, API 6A for wellhead applications, API 607 for fire testing, NACE MR0175 for sour service, and ISO 15848 for fugitive emissions. They can also be SIL 3 certified per IEC 61511 for safety loops.

Question 5

What sizes are available in bolted trunnion valves?

Accepted Answer

We supply bolted trunnion valves from 2" to 48" in ANSI classes 150 to 2500, from manufacturers Perar, Della Foglia, and DHV. 2-piece configurations cover up to 48" and 3-piece up to 36". Materials include carbon steel, stainless steel, duplex, and special alloys.

Question 6

How to choose between 2-piece and 3-piece?

Accepted Answer

Selection depends on the type of maintenance required: 2-piece is the most economical option for standard periodic maintenance; 3-piece allows full access to ball and seats without removing the valve from the line, ideal for refineries and process plants.

Welded Body Trunnion

Bolted Body Trunnion: Critical Isolation with Field Maintenance.

Problema

Impacto

Solución IPSA

Available types

2-Piece Trunnion

3-Piece Trunnion

Specifications

Standards & certifications

Available brands

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High-torque automation.

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