Fixed ball valve features 1, double blocking and emission features: Fixed ball valve spring preload floating seat, regardless of the valve is fully open or fully closed state, the upstream and downstream side of the valve seat to block the fluid, the valve body cavity retentate Drain through drain valve. 2, automatic pressure relief function: the valve body cavity to stay the medium temperature rise caused abnormal boost, without going through the safety valve, and the valve seat function can automatically pressure relief, which to ensure the safety of the valve in the delivery of liquid medium Sex is very important. 3, fire safety structure: the valve has a fire safety function, its design, manufacturing are to follow the API 607 ​​and API 6FA specifications. Fixed ball valve Fixed ball valve structure Fixed ball valve fixed ball valve advantage 1, sealing emergency grease fat ambulance: Due to foreign matter or fire in the medium caused by valve seat sealing accidental failure, the grease valve provides a quick connection with the grease gun, quick and easy Seal grease into the valve seat seal to ease leakage. 2, reliable stem seal and low operating torque: In addition to setting the standard seal ring, the packing gland is also set on the "O" ring, double seal to ensure the reliability of the stem seal; additional graphite packing and Seal grease injection minimizes valve stem leakage after a fire. Stem plain bearings and thrust bearings make the valve easy to operate. 3, the whole diameter or reduced diameter: According to the need to use full diameter or reduced diameter structure. Full-diameter valve flow diameter and pipeline diameter, easy to clean the pipeline. 4, the stem can be lengthened: According to the needs of installation or operation, lengthen the valve stem. Extra-long ball valve, especially for urban gas and other places need to be laid buried pipelines. Stem lengthened according to customer needs to determine. 5, flexible operation: The use of a small friction coefficient and good self-lubricating valve seat and stem bearings, greatly reducing the operating torque of the valve. So even in the absence of sealing grease in the case, but also long-term flexibility to operate the valve Keywords