Trunnion Ball Valve
Available for Made-to-Order only with 12 - 16 weeks lead time.
Material: CF8, CF8M, WCB | Size: 3" to 24" | Class: 150 lb - 600 lb ANSI
ANIX Trunnion Ball Valves, also known as Fixed Ball and Mounted Ball Valves, are manufactured and distributed by ANIX Valve USA. These valves are available in Stainless Steel CF8M / CF8 or Carbon Steel WCB material with class 150, class 300, and class 600 options.
Summary of Trunnion Ball Valve
A trunnion ball valve is a type of quarter-turn valve that uses a trunnion-mounted ball to control the flow of fluid through the valve. The ball is connected to a stem that runs through the center of the valve body. The stem is connected to a handwheel or lever that is used to open and close the valve.
When the valve is in the open position, the ball is aligned with the flow of fluid. When the valve is in the closed position, the ball is positioned across the flow of fluid, which blocks the flow.
The structure of a trunnion ball valve differs from an ordinary ball valve. The main difference lies in their stems. The stem of a trunnion ball valve has two seats, one at each end of the body cavity, which can seal the medium in both directions.
Trunnion-mounted ball valves feature three types of sealing surfaces: metal hard seal (e.g., stellite alloy), soft seal (e.g., PTFE), and composite seal (metal hard seat + soft seat).
Applications of a Trunnion Ball Valve
- Oil and gas production
- Chemical processing
- Water treatment
- Power generation
- Pulp and paper
- Food and beverage
- Pharmaceutical
Advantages of a Trunnion Ball Valve
Reduced Likelihood of Leaking
The trunnion ball valve is much less likely to leak compared to other types of valves. This is because the ball is supported on both sides by the trunnion, which prevents it from moving out of alignment with the seat. This design also makes the valve easier to maintain.
Versatility
Trunnion ball valves are effective in both high-pressure and low-pressure situations. Unlike floating ball valves, which require high pressure to create a seal, trunnion ball valves have spring-loaded seats that can stop flow even under low-pressure conditions.
Cost Efficiency
Additional pressure is absorbed by the trunnion and the stem, reducing friction between the ball and the seats. This lowers operating torque, increases lifespan, and eliminates the need for a large actuator.
Ease of Use
Trunnion ball valves are easy to operate. Simply turn the handwheel or lever with minimal effort to open or close the flow.