Fixed ball valve performance advantages

Fixed ball valve performance advantages

Fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines. Special considerations have been taken in its design such as strength, safety, and resistance to harsh environments. It is suitable for various corrosive and non-corrosive media. . Compared with the floating ball valve, when it works, the force generated by the fluid pressure in front of the valve on the ball is all transmitted to the bearing, and the ball will not move toward the valve seat, so the valve seat will not bear excessive pressure, so the fixed ball valve It has small torque, small valve seat deformation, stable sealing performance and long service life. It is suitable for high pressure and large diameter occasions. The advanced spring pre-valve seat assembly has self-tightening characteristics to achieve upstream sealing. Each valve has two valve seats, which can be sealed in each direction, so the installation has no flow restrictions and is bidirectional. This valve is generally installed horizontally. ,

1. Effortless operation: The ball is supported by upper and lower bearings, which reduces friction and eliminates excessive torque caused by the huge sealing load formed by the inlet pressure pushing the ball and the seal seat.

2. Reliable sealing performance: The PTFE single material sealing ring is embedded in the stainless steel valve seat. A spring is provided at the end of the metal valve seat to ensure sufficient pre-tightening force of the sealing ring. When the sealing surface of the valve is worn during use, under the action of the spring The valve continues to ensure good sealing performance.

3. Fireproof structure: In order to prevent the PTFE sealing ring from burning due to sudden heat or fire, resulting in large leakage and fueling the fire, a fireproof sealing ring is set between the ball and the valve seat. When the sealing ring burns, Under the action of the spring force, the valve seat sealing ring is quickly pushed onto the ball to form a metal-to-metal seal, which achieves a certain degree of sealing effect. The fire resistance test meets the requirements of APl6FA and APl607 standards.

4. Automatic pressure relief function: When the stagnant medium pressure in the middle cavity of the valve rises abnormally and exceeds the pre-force of the spring, the valve seat retreats away from the ball to achieve the effect of automatic pressure relief. After the pressure is relieved, the valve seat automatically returns to normal.

5. Drainage pipeline: Drainage holes are provided on the upper and lower sides of the valve body to check whether the valve seat is leaking. During operation, when ball valve is fully open or fully closed, the pressure in the middle cavity can be removed and the packing can be directly replaced; the middle cavity can be drained Retentate and reduce the contamination of the valve by the medium.