China's hard seal butterfly pneumatic valve protective measures

　　. Pneumatic valve plate welded bolt shoulds not be too long, otherwise it will withstand the pneumatic valve body because of the bolt is too long flow channel, cause seal face was 'built on stilts', can't play a role of sealing; Inspection should be paid attention to when the opening of the adjusting screw to ensure the sealing surface can tight joint.
　　. To choose the appropriate adjust pad, pad thickness should be slightly less than or equal to the pneumatic valve sealing surface bench height, make the soft seal and pneumatic valve plate seal face together, in the same plane.
　　. In order to prevent the gland nut off, should make proper locking nut tighten after processing.
　　. Fluid should be considered using conditions, choose to suit the requirements of the medium soft gasket, lest appear medium corrosion or high temperature deformation effect use.
　　. When pneumatic valve seat sealing surface damage is serious, pneumatic valve seat can be scrapped processing, pneumatic valve core after improvement can still with the same specifications of the pneumatic valve seat.
　　. Regulating pneumatic valve should be ready, avoid fierce on fierce off, lest affect the service life of the seal.