The shutoff of the flange ball valve is a ball, which revolves around the heart line of the valve body to open and close a valve. The new flanged ball valve products are more popular with customers. So the company is not just selling products again and again, but is committed not only to improving product performance, but also strengthening after-sales services. In the whole country of the factory everywhere today, only to break through the status quo, understand innovation, can win the opportunity.
What are the types of flanged ball valves?
One, floating ball ball valve
The sphere of the ball valve is floating. Under the action of medium pressure, the sphere can produce a certain displacement and tightly press on the sealing surface at the outlet side, so as to ensure that the outlet ends are sealed. The floating ball valve has the advantages of simple structure and good sealing, but the load that the ball bears the working medium is all passed to the export sealing ring. Therefore, we need to consider whether the material of the sealing ring can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves.
Two, fixed ball valve
The sphere of the ball valve is fixed and does not move after being pressed. The ball valve with a fixed ball has a floating seat. The valve seat is moved by the pressure of the medium, so that the seal is pressed on the ball to ensure the seal. Usually with the ball in the upper and lower shaft with bearings, operating torque, suitable for high pressure and large diameter of the valve. In order to reduce the valve operating torque and increase the reliability of the seal, valve seal has emerged in recent years, both the pressure injection of a special lubricant in the sealing surface, to form a layer of film that enhances the sealing, and reduce operating torque, more suitable for large-diameter high-pressure valve.
Three, elastic ball ball valve
The ball of the ball is elastic. The ball and seat gasket are made of metal materials. The sealing ratio is very high. The pressure of the medium itself has failed to meet the requirements of sealing, and external force must be applied. This valve is suitable for high temperature and high pressure medium. The elastic sphere is an elastic groove at the lower end of the inner wall of the sphere, and the elasticity is obtained. When the channel is closed, the wedge head of the stem is used to make the sphere open and the seat press tight to seal. Before rotating the ball, the wedge head is loosened first, then the sphere is restored to the original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operation torque of the sealing surface.