The utility model discloses a formula of relying on oneself flow control valve, hold the sleeve that the intracavity separates exhalant canal and inhalant canal including vertical fixing at the case subassembly, telescopic section of thick bamboo wall is equipped with at least one and the outlet of inhalant canal intercommunication, telescopic bottom and play water channel -inlet end intercommunication, be equipped with in the sleeve and join in marriage the case of being connected that has a face of cylinder with sleeve inner wall cunning, the pressure balance hole of lining up about the case is equipped with, the top that holds the chamber at the case subassembly is equipped with the membrane head, the case bottom is through vertical feedback pole and fix the feedback spring coupling in valve body inner chamber bottom, the feedback spring is equipped with elasticity guiding mechanism. It is high that it has the precision of regulation, and stability is good, characteristics such as the noise is low, long service life.