Fixed ball valve is mainly used in high pressure, large diameter of ball valve. Depending on the installation of seat sealing fixed ball valve has a ball before sealing seat and the ball after the seal seat two structures. Sphere seal before the seat of the sealing principle: and stem as a whole sphere can free rotation in the up and down sliding bearing and rolling bearing, valve seat sealing ring is installed inside the sleeve of the activity, the sleeve with 0 ring seal in the body. Seat sealing ring consists of a set of installation in the sleeve spring pressure in advance. Import the seat, the ball Industrial Valves is closed, by acting on the inlet diameter d and cooperate with the body of the sleeve diameter d. The limit imposed by the circular ring on the surface of the medium pressure pressed the seat to the ball, thus imported seal effect, the outlet valve seat sealing function. The role of reverse pressure, the seat will be changing. Floating ball valve body with two seat sealing, clamping a sphere between them, there is hole on a sphere, the diameter of the hole is equal to the inner diameter of the pipeline, said full bore ball valve; The diameter of the hole is slightly smaller than the inner diameter of the pipe, reducing ball valve. Sphere with the aid of the valve stem can freely rotate in the seat sealing. In open, aim the ball hole and pipe diameter, to ensure the working medium of least resistance. When the valve rod rotation 1/4 turn, perpendicular to the channels of the valve, the ball hole by prestressing force to two seat sealing medium pressure and push the ball tightly pressed on the outlet seat sealing, to ensure that the valve seal completely. The ball Industrial Valves is a single seal. The floating ball valves should also be considered the seat material can withstand the load of ball, because spheres besides own self-respect also all work under medium load and passed to the seats. In addition, considering the floating ball valve in the operating of large diameter need greater force. In order to ensure floating ball valve sealing and reliability, at work on the ball and seat of the contact surface, should have the sealing pressure is high enough, but shall not exceed the allowable specific pressure of the seat material. Seat in the groove with should be close, even if the seat to the sphere of the sealing is very good, the medium will be along the groove end leakage. Spheres should have the correct geometry and low surface roughness values. Usually made according to h6 or h7 precision ball, the surface roughness value is not more than R. 0. 4, for the sake of improving the surface hardness and wear resistance, should be hardening treatment on the surface of a sphere. Sealing seat available plastic, and shall ensure that fit closely, shall not damage the sealing face of the sphere. At the same time, the material should have sufficient strength, so that can seal under high pressure. Ptfe is the seat of one of the most commonly used materials. In this paper, the keyword search: more technical articles valve product supply information
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