The performance advantages of fixed ball valves are as follows:
1. Labor saving operation: the ball is supported by upper and lower bearings, which reduces friction and eliminates the torque caused by the huge sealing load formed by the ball and seal seat driven by the inlet pressure.
2. Reliable sealing: PTFE single material seal ring is embedded in the stainless steel valve seat, and a spring is set at the end of the metal valve seat to ensure sufficient preload of the seal ring. When the sealing surface of the valve is worn during use, the valve can still ensure good sealing performance under the action of the spring.
3. Fireproof structure: in order to deal with sudden heat or fire, a fireproof sealing ring is set between the ball and the valve seat. When the sealing ring is burned out, under the action of spring force, the valve seat sealing ring is quickly pushed onto the ball to form a metal seal; The fire resistance test meets the requirements of APl6FA and APl607 standards.
4. Automatic pressure relief: when the pressure of the stagnant medium in the valve chamber rises abnormally and exceeds the preload of the spring, the valve seat will retreat from the ball to achieve the effect of automatic pressure relief. After pressure relief, the valve seat will automatically reset.
5. Drain pipe: drain holes are set at the upper and lower parts of the valve body to check whether the valve seat leaks; When working, if the valve is in the fully open or fully closed state, the packing can be directly replaced by removing the middle chamber pressure; It can discharge the residues in the middle chamber to reduce the damage of the medium to the valve.
