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1. Double block and discharge function: the fixed ball valve adopts spring preloading floating valve seat. When the valve is fully open or fully closed, the upstream and downstream valve seats block the fluid, and the retention in the valve body cavity is discharged through the discharge valve.

2. Automatic pressure relief function: when the abnormal pressure rise caused by the temperature rise of the medium in the valve body cavity, it is not necessary to pass through the safety valve, but only rely on the valve seat function to automatically relieve the pressure, which is very important to ensure the safety of the valve when conveying liquid medium.

3. Fire safety structure: all valves have fire safety function, and their design and manufacture comply with API 607 and API 6fa specifications. The advantages of valve fixed ball valve: 1. Sealing emergency grease injection rescue: due to foreign matters in the medium or fire, the valve seat seal fails unexpectedly. The grease injection valve provides a quick connection with the grease injection gun, and the imported pump can inject the sealing grease into the sealing part of the valve seat conveniently and quickly to alleviate the leakage. 2. Reliable valve stem seal and low operating torque: in addition to the standard sealing ring, O-ring is also set on the packing gland to ensure the reliability of the valve stem seal; the graphite packing and sealing grease injection are added to minimize the valve stem leakage after fire. The sliding bearing and thrust bearing of the valve stem make the valve easy to operate. 3. Full bore or reduced diameter: full bore or reduced diameter structure can be selected as required. The flow aperture of full bore valve is consistent with the inner diameter of pipeline, which is convenient for pipeline cleaning.

4. Valve stem can be lengthened: according to the needs of installation or operation, the http://www.didlink-valve.com/  valve stem can be lengthened. Extended rod ball valve, especially suitable for city gas and other occasions where buried pipeline is needed. The size of lengthened valve stem is determined according to customer's requirements.

5. Flexible operation: the valve seat and stem bearing with small friction coefficient and good self-lubricating property can greatly reduce the operating torque of the valve. Therefore, the valve can be operated flexibly for a long time even without sealing grease.