The classification of flanged ball valves is as follows:
法兰球阀的分类如下：
1, elastic ball valve, ball valve ball is elastic, ball and seat sealing ring are made of metal materials, sealing pressure is very large, relying on the pressure of the medium itself has not reached the requirements of sealing, external force must be applied.
1、弹性球球阀，球阀的球体是弹性的，球体和阀座密封圈都采用金属材料制造，密封比压很大，依靠介质本身的压力已达不到密封的要求，须施加外力。
2, fixed ball valve, flange ball valve ball is fixed ball, fixed ball valve with floating seat, by the medium pressure, the seat is moved, so that the sealing ring is firmly pressed on the ball to ensure sealing.
2、固定球球阀，法兰球阀的球体是固定的，固定球球阀都带有浮动阀座，受介质压力后，阀座产生移动，使密封圈紧压在球体上，以保证密封。
3, floating ball valve, flange ball valve ball is floating, under the action of medium pressure, the ball can produce displacement and tight pressure on the outlet sealing surface, to ensure that the outlet is sealed, floating ball valve structure is simple, good sealing.
3、浮动球球阀，法兰球阀的球体是浮动的，在介质压力作用下，球体能产生的位移并紧压在出口端的密封面上，保证出口端密封，浮动球球阀的结构简单，密封性好。
