Top Entry Trunnion Mounted Ball Valve
Product Introduction
A Top Entry Trunnion Mounted Ball Valve is a type of ball valve where the ball is supported by a trunnion (a shaft at the top and bottom of the ball) and the valve body can be accessed from the top for maintenance or inspection without removing the entire valve from the pipeline.
Product Advantages
Top Access Design
The top-mounted design of the valve cover facilitates access to internal components, allowing for maintenance, inspection, and repair without removing the valve from the pipeline.
Bearing-Type Ball Valve
The ball valve is supported by bearings (bearing housings) at the top and bottom, helping to absorb pressure thrust and reduce operating torque.
Airtight Seal
Provides reliable sealing performance even under high pressure or high temperature, suitable for on/off and throttling applications.
High Pressure and Large Size Capacity
By design, it can withstand extremely high pressure ratings (up to ANSI 2500 or higher) and pipeline diameters exceeding 24 inches.
Why Choose Us
Professional Team
Onero Valve Corporation operates two production bases with over 140 employees, including 40 technical staff.
Fully Equipped
The factory is fully equipped, supported by specialized personnel responsible for processing, batching, assembly, testing, painting, and packing, all under strict process control.
Sales Market
Our core products are exported to the United States, Europe, South Korea, and the Middle East, where we maintain close partnerships and receive high praise from customers.
Certifications
Onero Valve Corporation holds ISO9001, API-6D, ISO14001 (environmental management), and ISO18001 (occupational health and safety) certifications.
FAQ
Q: What is a top entry trunnion mounted ball valve?
A: A top entry trunnion mounted ball valve is a valve where the ball is supported by a trunnion and the body can be accessed from the top. It allows for easy maintenance and reliable operation in high-pressure pipelines.
Q: What are the main advantages of trunnion mounted ball valves?
A: They provide low operating torque, stable sealing, and can handle high-pressure and large-diameter applications. The trunnion support reduces stress on the valve stem.
Q: What does top entry mean?
A: Top entry means the valve body can be opened from the top without removing the entire valve from the pipeline. This simplifies maintenance and reduces downtime.
Q: What materials are used for this valve?
A: Common materials include stainless steel, carbon steel, alloy steel, and duplex steel for the body and ball. Seals are often PTFE, PEEK, or metal-to-metal depending on temperature and pressure requirements.
Q: What sizes and pressure ratings are available?
A: Sizes typically range from 2" to 48" (50 mm – 1200 mm) and pressure ratings up to 2500 psi (or API 1500-2500). Custom sizes and ratings can be made on request.
Q: Where is this valve commonly used?
A: It is widely used in oil & gas, petrochemical, power plants, water treatment, and chemical industries, especially for high-pressure pipelines and critical isolation points.
Q: How does a trunnion mounted ball valve operate?
A: The trunnion supports the ball at the top and bottom, allowing rotation with minimal torque. Actuators or manual gear operators can rotate the ball to start or stop flow.
Q: Can it handle high temperature and high-pressure fluids?
A: Yes. Trunnion mounted valves are designed for extreme conditions, including high-pressure gases, steam, and hydrocarbons, while maintaining reliable sealing.
Q: How is sealing achieved?
A: Sealing can be soft (PTFE or similar polymer) or metal-to-metal, depending on application. Spring-loaded seats maintain contact with the ball for tight shut-off.
Q: Why choose top entry over side entry valves?
A: Top entry allows easier inspection, maintenance, and repair without removing the valve. This reduces downtime and maintenance cost, especially in large-diameter or high-pressure pipelines.
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