Pneumatic control valve

The utility model relates to a valve field especially mainly relates to a pneumatic control valve, including valve body, secondary air cylinder and master cylinder, be provided with first cavity and second cavity in the valve body, be provided with in the secondary air cylinder third cavity be provided with the fourth cavity in the master cylinder, first cavity communicates with valve body entry and third cavity respectively, second cavity and valve body export intercommunication. The utility model discloses a pneumatic control valve simple structure who describes through first cavity and second cavity intercommunication, makes medium pressure in first cavity and second cavity the same, and the power of the medium that the valve rod receives is balanced from top to bottom, and it is high pressure resistant to make this device reach balanced ability. 本实用新型专利涉及阀领域,尤其主要涉及种气控阀，包括阀体、二级气缸和主气缸，所述阀体内设置有第腔室和第二腔室，所述二级气缸内设置有第三腔室、所述主气缸内设置有第四腔室，所述第腔室分别与阀体入口和第三腔室连通，所述第二腔室与阀体出口连通。本实用新型所描述的种气控阀结构简单，通过第腔室与第二腔室连通，使介质在第腔室与第二腔室中