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Trunnion Mounted Ball Valves Explained for Precision Flow in High Pressure Systems

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When it comes to controlling the flow of liquids or gases in pipelines, trunnion mounted ball valves are a top choice. These valves are made for high-pressure systems and give smooth, long-lasting performance. Unlike regular floating ball valves, trunnion mounted ball valves have a ball that stays in place and is held by trunnions. This design lowers wear and makes it easier to turn the valve, keeping it reliable for years.

Keystone Valve Supply offers these high-performance valves for industries like oil and gas. They come in sizes from NPS 2” to 24” and handle pressures from ANSI 150 to 2500, making them fit many types of industrial jobs.

How Trunnion Mounted Ball Valves Work

Trunnion mounted ball valves are simple but very effective. When pressure acts on the ball, the force moves through the stem and trunnion to the valve body. Special bearings, made of steel and PTFE, help the ball turn smoothly and reduce friction. This makes it easier to operate the valve and helps the parts last longer. The bearings also do not need maintenance, which saves time and effort.
These valves are best for systems where high pressure or big pipe sizes can make regular ball valves hard to use. Industries like oil refining, pipelines, and custody transfer use these valves to keep their systems safe and running smoothly.

Key Features and Specifications

Feature Description
Size Range NPS 2” – 24”
Pressure Ratings ANSI 150 – 2500
Materials Stainless Steel and Carbon Steel with SS trim
Certifications API 6D, 641, 607, CSA Z245.15
Design Double Block & Bleed (DB&B), Double Isolation & Bleed (DIB-1 & DIB-2)
Bearings Steel-backed PTFE, maintenance-free
Torque Low due to trunnion support

These features make trunnion mounted ball valves great for pipelines, refineries, measurement systems, and multi-product terminals.

Other Advanced Valves

Keystone Valve Supply also has other special valves:
  • Microfinish ball valves – for very smooth sealing and precise control.

  • Omni DIB/DBB expanding plug valves – for double isolation and safe bleeding of fluids.

  • API 6D 4-way diverter valves – for switching flow directions in complex systems.

These options make sure you can find the right valve for any industrial system.

Advantages for Industry

Trunnion mounted ball valves are built to work in tough environments. They offer:
  • Easy Operation – Can turn easily even in big pipes.

  • High Pressure Handling – Works safely in ANSI 150–2500 pressure ranges.

  • Less Wear – Bearings reduce friction and make valves last longer.

  • Flexible Use – Fits pipelines, refineries, measurement systems, and multi-product terminals.

  • No Maintenance – Bearings do not need regular servicing.

These advantages make them a favorite for companies that need dependable, long-lasting valves.

How to Choose the Right Valve?

Picking the right valve depends on what the system needs, including pressure and fluid type. Keystone Valve Supply helps you choose the best trunnion mounted ball valve for your system. They have experience with oil refineries, fuel systems, offshore platforms, and custody transfer, so every application gets the perfect solution.

Concluding Thoughts: Why a 2 Piece Trunnion Ball Valve Works Best

For industries needing strong and precise valves, a 2 piece trunnion ball valve from Keystone Valve Supply is ideal. These valves reduce effort to turn, resist high pressure, and last a long time. Request a quote today to see how Keystone Valve Supply can improve your flow control systems and keep your operations safe.

FAQs

What is a trunnion mounted ball valve?
A trunnion mounted ball valve is a valve where the ball is held in place by supports called trunnions, making it easier to turn and last longer.
How does the trunnion design help the valve?
The trunnion supports the ball and moves pressure forces to the valve body, lowering friction and making it easier to operate.
What materials are used in these valves?
They are made from stainless steel or carbon steel with stainless steel trim to resist rust and last in tough conditions.
What pressure can these valves handle?
They handle pressure from ANSI 150 to ANSI 2500, making them safe for pipelines and high-pressure industrial systems.
Which industries use these valves?
They are used in oil and gas, refineries, aviation fuel systems, offshore platforms, and custody transfer systems.
Are the bearings maintenance-free?
Yes, the steel-backed PTFE bearings let the valve turn easily without needing regular maintenance, saving time and effort.
Can these valves work in big pipes?
Yes, they are perfect for pipes from NPS 2” to 24” and handle large flows with low operating effort.
What is the difference between DBB and DIB valves?
DBB (Double Block & Bleed) and DIB (Double Isolation & Bleed) valves let you safely isolate fluid and release pressure when needed.
Do these valves meet international standards?
Yes, they meet API 6D, API 641, API 607, CSA Z245.15, and ISO 15848-1 for quality, safety, and low emissions.
Can they be used in measurement units?
Yes, these valves are great for measurement skid units, multi-product systems, and custody transfer, ensuring safe and precise control.