Orbit ball valveand gate valve belong to the same type of valve. The difference is that its closing part is a sphere, and the sphere rotates around the center line of the valve body to open and close.
The Orbit ball valvecan be divided according to the structure form: 1. The ball of the floating ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface at the outlet end to ensure the outlet end is sealed. The floating ball valve has simple structure and good sealing performance, but the load of the working medium borne by the ball is transferred to the outlet sealing ring. Therefore, whether the sealing ring material can withstand the working load of the ball medium should be considered. This structure is widely used for medium and low pressure ball valves. 2、Fixed ball valve: The ball of the ball valve is fixed, and will not move after being pressed. Fixed ball valves are equipped with floating valve seats. The valve seats move under the pressure of the medium, making the seal ring tightly pressed on the ball to ensure sealing. Generally, the upper and lower shafts of the ball are equipped with bearings, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil sealed ball valves have appeared in recent years, which not only inject special lubricating oil between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque, and is more suitable for high pressure and large caliber ball valves. 3、Elastic ball valve: The ball of the ball valve is elastic. The ball and valve seat seal ring are made of metal materials, and the sealing specific pressure is very high. The pressure of the medium itself cannot meet the sealing requirements, so external force must be applied. This valve is suitable for high temperature and high pressure medium. The elastic sphere obtains elasticity by opening an elastic groove at the lower end of the inner wall of the sphere. When the channel is closed, use the wedge head of the valve stem to expand the ball and compress the valve seat to seal. Loosen the wedge head before rotating the ball, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.
