For the wide variety of ball valves, including the different working principles, use media and application places, users should choose different types of ball valves corresponding to the requirements of the working conditions. The types of ball valves are classified according to the actual working conditions on site.
According to the structure, it can be divided into:
1. Floating ball valve
The ball of the 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 of the outlet end to ensure that the outlet end is sealed.
The floating ball valve has a simple structure and good sealing performance, but the load of the sphere bearing the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium. This structure is widely used in medium and low pressure ball valves.
2. Trunnion mounted ball valve
The ball of the ball valve is fixed and does not move after being pressed. The trunnion ball valve is equipped with a floating valve seat. After the pressure of the medium, the valve seat moves, so that the sealing ring is pressed tightly on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, 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 usability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricants are injected between the sealing surfaces to form an oil film, which enhances the sealing performance and reduces the operating torque. , It is more suitable for high-pressure and large-caliber ball valves.
There are several commonly used ball valve classification methods as follows
According to pressure: high pressure ball valve, medium pressure ball valve, low pressure ball valve
According to the flow bore: full bore ball valve, reduced bore ball valve
According to channel position: straight-through, three-way, right-angle
According to the temperature: high temperature ball valve, normal temperature ball valve, low temperature ball valve, ultra-low temperature ball valve
According to the sealing form: soft sealing ball valve, hard sealing ball valve
According to stem assembly : top-mounted ball valve, side-mounted ball valve
According to the connection form: flange ball valve, welded ball valve, threaded ball valve, clamp ball valve
According to the driving mode: manual ball valve, automatic control ball valve (pneumatic ball valve, electric ball valve, hydraulic ball valve)
According to the size: super large size ball valve, large size ball valve, medium size ball valve, small size ball valve
