Material：Carbon steel，Stainless steel
Structural characteristics and applications
The valve consists of the left valve body, the middle valve body, the right valve body, the fan blind plate, the screw nut pair, the stainless steel compensator, the chain push-rod and so on. It is connected by three screw rods, and the three valve bodies are fixed on the base, to form a rigid structure. The middle valve body and the right valve body are connected by stainless steel expansion pipe, the left and middle valve body are connected by three screw rods with two silk belts and about trapezoidal threads, and the left and middle valve bodies are compressed (or separated) by rotating forward (or reverse) the three mulberry screw at the same time. Three screw in the middle of a screw rod equipped with blind plate, blind plate cymbal axis rotation. The following two lead screws are installed on the same part of the blind plate positioning block, blind plate can be turned to prevent the blind plate drift, avoid sealing rubber ring abrasion.