Fixed ball valve structure features 1) Automatic pressure relief structure. When the pressure of the middle cavity is abnormally increased, the ball valve with single seal structure has the function of automatic pressure relief, while the ball valve with double seal structure is relieved by the additional pressure relief device on the valve body. 2) Sealed emergency rescue Valves are designed with an auxiliary seat emergency sealing system, as shown. As soon as the soft seal is damaged or cannot be sealed in an emergency, the corresponding sealant is injected into the auxiliary sealing system Emergency sealing is possible. Emergency seals can also be used to flush and lubricate the seat area if necessary to keep it clean. The same stem can also be designed with auxiliary functions of the emergency sealing system.
