Structure and working principle of pneumatic butterfly valve
Pneumatic butterfly valve is a flexible body formed by vulcanization of cord layer, inner and outer layers or steel wire ring after molding. It is a component that uses air filled compressibility to complete elastic function.
It is commonly known as pneumatic butterfly valve, pneumatic butterfly valve, etc. The pneumatic butterfly valve assembly consists of a pneumatic butterfly valve, an upper base, a lower base (piston), and a cushion pad, which are assembled to form a whole body with a closed air chamber. Pneumatic butterfly valves can be divided into three categories according to their shapes: capsule type, membrane type and sleeve type. According to the sealing structure, it can be divided into four categories: pressure self sealing type, rim clamping type, hoop seal type and hybrid type. The load of the pneumatic butterfly valve is mainly received by the cord. The number of layers of the cord is mainly composed of two layers. The special request product is composed of four layers of cord. The inner layer is mainly used for sealing, while the outer layer is used for maintenance in addition to sealing. When the pneumatic butterfly valve works, the inner chamber is filled with compressed air to form a compressed air column. With the increase of vibration load, the height of the ball valve decreases, the volume of the inner chamber decreases, the stiffness of the ball valve increases, and the effective bearing area of the air column in the inner chamber increases. At this time, the bearing capacity of the ball valve can increase. When the vibration load decreases, the height of the ball valve increases, the volume of the inner chamber increases, the stiffness of the ball valve decreases, and the effective bearing area of the air column in the inner chamber decreases. At this time, the bearing capacity of the ball valve decreases. In this way, within the effective stroke of the pneumatic butterfly valve, the height, inner cavity volume and bearing capacity of the pneumatic butterfly valve can achieve smooth and flexible transmission, efficient control of amplitude and vibration load with the increase and decrease of vibration load. It can also adjust the stiffness and bearing capacity of the ball valve by increasing or decreasing the air volume, and it can also be equipped with an auxiliary air chamber to complete automatic conditioning. AW=F ／ P, where: AW － effective area of pneumatic butterfly valve, mm2, F － load of pneumatic butterfly valve, kN, P － internal pressure of pneumatic butterfly valve, MPa