800 caliber fixed ball valve product structure: the upper and lower shaft center of the ball fixed in the center, under the pressure of the medium, will not happen displacement. Sealing material selection of high temperature, and wear-resistant PPL to seal. Fixed ball valve seal with a spring at the bottom, reliable preload, automatic compensation function is good. 800 caliber fixed ball valve features: A: the use of turbine switch, the switch is easy to control the flow rate; B: the spring loaded, when the valve abnormal pressurization, the valve can automatically relief; C: switch easy; D: long life ; E: structural features; all through the emergency seal, fire and so on; F: 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.