Ball ball valve with a fixed axis, called fixed ball valve. Fixed ball valve is mainly used for high pressure large diameter. Differ according to the installation of seat sealing, fixed ball valve can be two kinds of structure: the ball before sealing seat, ball after the seal of the seats. A, fixed ball valve features: 1, double block and discharge function: fixed ball valve USES the floating seat spring preload, regardless of when the Industrial Valves is in full open or close state, upstream and downstream side of the seat that fluid blocking, body lumen retentate through the discharge valve discharge. Stay 2, automatic pressure release: the valve body cavity medium temperature increase caused by the abnormal pressure, do not need through the relief valve, and only on the seat function can automatic relief, this to guarantee the safety of valve in liquid medium is very important. 3, the structure of the fire safety: has function of fire safety valve, its design, manufacture all follow the API 607 and API 6 fa specification requirements. Second, fixed ball Industrial Valves advantages: 1, sealing emergency greasing rescue: seat tightness due to medium foreign body or fire accident failure, greasing valve provides a connection to a quick note grease gun, convenient to import pump sealing grease injection to the valve seat sealing parts, reduce leakage. 2, reliable stem seal and low operating torque: in addition to setting the standard of sealing ring, the packing gland is also equipped with type O sealing ring, double seal to ensure the reliability of the stem seal; Adding graphite packing and sealing grease injection makes the valve stem leakage after the fire to a minimum. Sliding bearing and thrust bearing makes the valve stem operation. 3, full size or reducing: can choose according to need full size or reducing structure. Full size valve flow aperture is consistent with the pipeline diameter, facilitate pipeline cleaning. 4, the valve stem can be lengthened: according to the needs of the installation or operation, can be extended to the valve stem. Extension rod ball valve, especially suitable for the occasion of city gas and so on need to be buried laying pipelines. Lengthen the stem size according to customers need to be addressed. 5, flexible operation, using a small friction coefficient and good self-lubrication bearing seat and stem, greatly reducing valve operating torque. So even in the case of the provided no sealing grease, is also a long-term mobility to operate the valve.
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