Product structural characteristics

The series of fixed ball valves are mainly applicable to industries such as natural gas, oil products, chemical engineering, metallurgy, urban construction, environmental protection, pharmaceuticals, food, etc. Among them, the anti-sulfur series is suitable for natural gas long-distance pipelines with hydrogen sulfide-containing media, high impurity content, and severe corrosion.

Its main structural features are:

1. Shell structure 
The valve body of the fixed ball valve can be designed in three forms according to the user's requirements and actual working conditions: casting structure, forging structure, and fully welded structure. Among them, the fully welded structure ball valve is mainly suitable for underground use. 
2. Special valve seat sealing structure 
Fixed ball valves are designed with different sealing structures based on the pressure level, the nature of the medium, and the sealing requirements. They can have a front seal structure, a rear seal structure, or a dual seal structure at both the front and the rear. 
3. Automatic pressure relief structure 
When the pressure in the middle chamber abnormally rises, the ball valve with a single-sealed structure has the function of automatically releasing the pressure, while the ball valve with a double-sealed structure is relieved of the pressure by the additional pressure relief device on the valve body. 
4. Sealed emergency rescue 
When the valve seat and valve stem seals are damaged and cause leakage, the sealing grease injected through the grease injection valve can provide a temporary sealing effect. 
5. Fireproof Structure 
According to the working conditions and the needs of the users, the ball valve can be designed with a fire-resistant structure. The fire-resistant design of the ball valve complies with the provisions of standards such as API 607, API 6FA and JB/T 6899. In the event of a fire causing the soft sealing ring to burn out, the fire-resistant structure of the ball valve can prevent a large amount of medium from leaking and prevent the further expansion of the fire. 
6. Anti-static structure 
When operating the valve, due to the friction between the ball and the valve seat, static electric charges will be generated and accumulate on the ball. To prevent the occurrence of static electric sparks, an anti-static device is specially installed on the valve to discharge the accumulated charges on the ball. 
7. Blockage and Excretion 
When the valve is in the closed position, the valve seats on both the upstream and downstream sides block the flow of the fluid. The accumulated substances in the cavity of the valve body can be discharged through the drainage device. 
8. Locking device 
At the fully open and fully closed positions of the manual ball valve, a locking structure is designed. This ensures that accidental operation and unexpected vibration of the pipeline cannot cause abnormal switching phenomena. Especially in the production lines of flammable media such as petroleum and chemical substances, as well as when the valve is installed outdoors, this design shows particularly good advantages and practical effects. 
9. Full-bore structure and reduced-bore structure 
To meet the diverse needs of users, our company's ball valve products are available in two series: full diameter and reduced diameter. The inner diameter of the passage in the full diameter ball valve is consistent with the inner diameter of the pipeline, which is convenient for management and cleaning. While the reduced diameter series ball valves are relatively lightweight in weight, and the fluid resistance is only about 1/7 of that of the same diameter stop valve. Therefore, the application prospects of the reduced diameter series ball valves are more extensive.

Main external connection dimensions