Trunnion Ball Valve

HEARKEN Your Trusted Trunnion Ball Valve Expert

As a professional and reliable trunnion ball valve manufacturer and supplier in China, offers a variety of materials, designs, sizes, pressure levels and end connections with reliable sealing performance and the best prices.

We always take excellent quality as our core commitment, exceed industry standards, and pass a series of quality inspections to ensure that customers get the best product experience. For more details, please feel free to contact us!

Why Trunnion Ball Valve?

1. Reduced Leakage

The trunnion mounting design supports the ball from both sides, ensuring that the ball is aligned with the valve seat, significantly reducing the possibility of leakage.

2. High Versatility

Pneumatic actuated trunnion ball valves work effectively under both high and low pressure conditions. The spring-loaded seat forms a seal even at minimal pressure, while floating ball valves require high pressure to work properly.

3. Lower Torque Requirements

The trunnion design absorbs excess line pressure and minimizes friction between the ball and the valve seat. This reduces operating torque, making the valve easier to operate and ideal for automated systems.

4. Cost Effectiveness

Lower torque requirements reduce wear and extend the life of the valve without the need for a larger actuator. This saves costs.

5. Wide Range of Sizes

Pneumatic actuated trunnion ball valves are available in a variety of sizes, suitable for both small low-pressure applications and large high-pressure systems.

6. Spring-loaded Seats

The spring-loaded seats ensure a tight seal under both high and low pressure conditions. This versatility improves reliability under different operating conditions.

7. Self-Relief

Pneumatic actuated trunnion ball valves automatically relieve cavity pressure by releasing excess cavity pressure to the low-pressure side. This feature prevents damage caused by overpressure.

8. Double Block and Vent Function

Trunnion mounted ball valves isolate upstream and downstream pressures while allowing pressure to be released through the vent port, improving safety and reliability during maintenance.

9. Easy Maintenance and Operation

Pneumatic actuated trunnion ball valves is designed for easy manual operation and maintenance. The three-piece design allows for quick removal, cleaning, and replacement of internal components.

10. Customizable Features

Pneumatic actuated trunnion ball valves can be enhanced with corrosion-resistant materials, injection systems for tight sealing, and lifting lugs for handling large valves, allowing them to be adapted to specific industrial needs.

11. Compliance with Industry Standards

Trunnion ball valve is designed to meet API 608 and API 6D standards, meeting stringent testing and safety requirements to ensure reliability and consistency.

What is a Trunnion Ball Valve?

A trunnion ball valve is a specialized quarter-turn valve used to regulate the flow of liquids, gases, or oils within pipelines.

Unlike standard ball valves, trunnion mounted ball valve features a fixed ball mounted on a trunnion (shaft-like support) at the bottom, with the top connected to the valve stem. This design enhances stability, minimizes wear, and ensures precise flow control, making it ideal for high-pressure and large-scale applications.

How Does a Trunnion Ball Valve Work?

The operation of a trunnion ball valve revolves around its key components:

What Parts Does a Trunnion Ball Valve Consist of?

1. Body

The valve body houses and secures all internal components.

It can be constructed from various materials, including duplex and super duplex stainless steel, inconel, carbon steel, or low-temperature carbon steel, depending on the application and operating environment.

2. Seat

Positioned around the ball, the seat ensures the ball stays securely in place when the actuator is engaged. Seats come in two types: soft (Teflon) for enhanced sealing or metal for high-temperature or abrasive applications.

3. Ball

The ball is the rotating element responsible for starting or stopping the flow. It remains fixed in its position while rotating to control fluid movement effectively.

4. Stem

The stem connects the actuator to the ball, transmitting motion to open or close the valve. It is securely fastened to maintain alignment and functionality.

5. Trunnion

The trunnion, an additional support shaft beneath the ball, prevents the ball from shifting under pressure. It ensures stability by holding the ball securely in place. In floating ball valves, the trunnion is welded to the ball disk to provide similar functionality.

6. Injection System

Located in the stem and seat areas, this feature serves as a secondary sealing mechanism. In the event of a leak, the injection system provides a temporary seal to contain fluid leakage.

Working Principle of Trunnion Ball Valve

Open Position: When the bore in the ball aligns with the pipeline, media flows freely.

Closed Position: Rotating the actuator 90 degrees shifts the bore perpendicular to the pipeline, stopping flow.

Spring-loaded seats and polymer ring inserts ensure the ball remains securely in place, reducing friction during operation. This design also includes seals and an adjustable gland packing box to prevent leakage under varying pressure conditions.

Features of trunnion ball valve

Quarter-Turn Design: Allows fast and straightforward operation.

Stability: Trunnion support secures the ball, ensuring smooth rotation and reliability.

Low Torque Requirement: Reduces friction between the ball and seat, enabling effortless operation even under high pressures.

Full or Partial Bore Options: Full bore matches the pipeline diameter, while partial bore has a smaller opening for specialized applications.

Depressurization Capability: Includes bleeders for safe pressure release.

Applications of Trunnion Ball Valves

Versatile and rugged, trunnion ball valves are indispensable in industries that require high-pressure handling, leak-proof performance, and precise flow control. Their durability and advanced features ensure safe and efficient operations even under extreme conditions.

1. Chemical Manufacturing

In chemical plants, where the safe transfer of corrosive and aggressive fluids is critical, trunnion ball valves play a vital role:

Leak-proof seals: prevent leaks of hazardous chemicals that could endanger workers or damage the environment.

Temperature resilience: withstands the high temperatures often encountered in chemical processing.

Corrosion resistance: handles corrosive chemicals for long periods of time without wear.

2. Oil and Gas Industry

Pneumatic actuated trunnion ball valves are widely used in the petrochemical industry because of their ability to handle high pressure and large flow requirements:

API 6D compliance: ensures reliability of high-pressure pipelines such as oil transportation and natural gas pipelines.

Pressure management: supports large-scale flow operations, minimizes the risk of leaks, and enhances system safety.

3. Power Generation

Power generation relies on the controlled release of media such as steam or water:

High-temperature performance: ideal for geothermal power plants where steam management is critical.

Flow Regulation: Ensures precise control of water flow in hydroelectric power plants to optimize efficiency.

4. Water Treatment and Distribution

Pneumatic actuated trunnion ball valves ensure reliable and efficient management of municipal and industrial water:

Leak Prevention: Prevents waste and ensures safe disposal of clean and wastewater.

Large-Scale Operations: Effectively handles high-pressure water distribution systems.

5. Mining

In mining operations, abrasive slurries and harsh conditions are common, and trunnion ball valves offer the following benefits:

Wear Resistance: Designed to withstand wear from abrasive particles in slurries.

Durability: Reliably performs in high-pressure and heavy-duty applications.

6. Cryogenic and LNG Applications

Handling liquefied natural gas (LNG) and other cryogenic fluids requires specialized valves:

Cryogenic Performance: Operates efficiently in extremely cold conditions.

Seal Integrity: Maintains leak-proof operation despite thermal contraction.