Ball valve Daquan: floating, fixed, hard sealed, V-shaped, heat preservation, pipeline, clamp, rail, tee, internal thread, low temperature, eccentric ball valve

Ball valve Daquan: floating ball valve, fixed ball valve, hard seal ball valve, v-ball valve, heat preservation ball valve, pipeline ball valve, wafer ball valve, track ball valve, top mounted ball valve, pigging valve, forged steel ball valve, three-way ball valve, internal thread ball valve, integral ball valve, low temperature ball valve, corrugated pipe ball valve, eccentric hemispherical valve, all welded ball valve, Special ball valve It can be roughly divided into 19 categories, including floating ball valve, fixed ball valve, metal hard sealed ball valve, v-ball valve, wafer ball valve, insulation ball valve, pipeline ball valve, track ball valve, top mounted ball valve, pigging valve, high-pressure forged ball valve, three-way (four-way) ball valve, internal thread ball valve, integral ball valve, low-temperature ball valve, bellows ball valve, eccentric hemispherical valve, all welded ball valve, special ball valve Valves, etc Ball valve can be applied to a wide range of: 1 Nominal diameter from 8mm to 1200mm 2 Nominal pressure from vacuum to 42MPa 3 The working temperature is from - 204 ℃ to 815 ℃ The ball valve can be divided into: 1 The ball of the floating ball valve is floating Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end The structure of floating ball valve is simple and its sealing performance is good, but the load of working medium borne by the ball 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 ball medium This structure is widely used in medium and low pressure ball valves 2 The ball used to fix the ball valve is fixed and will not move under pressure Fixed ball valves are equipped with floating seats Under the pressure of medium, the seats move to make the sealing ring tightly press on the ball to ensure the sealing Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque, suitable for high-pressure and large-diameter valves In order to reduce the operating torque of ball valve and increase the reliability of sealing, oil sealed ball valve has appeared in recent years Special lubricating oil is injected between sealing surfaces to form a layer of oil film, which not only enhances the sealing performance, but also reduces the operating torque It is more suitable for ball valve with large diameter and high pressure 3 The ball of the ball valve is elastic Both the ball and the seat seal ring are made of metal materials The specific pressure of the seal is very large The pressure of the medium itself can not meet the requirements of the seal, so an external force must be applied This valve is suitable for high temperature and high pressure medium The elastic sphere is an elastic groove opened at the lower end of the inner wall of the sphere to obtain elasticity When the channel is closed, the wedge-shaped head of the valve rod is used to make the ball expand and compress with the valve seat to achieve sealing Before rotating the ball, first loosen the wedge-shaped head, and then 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 Ball valve can be divided into straight through, three-way and right angle type according to its channel position Three way and right angle ball valves are used to distribute and change the flow direction of media.