One-way valve for gas phase

The utility model provides a one-way valve for a gas phase, which comprises a first valve body and a second valve body, and the first valve body is connected and locked with a second thread part at one end of the second valve body through a second connecting part; the end cover is connected and locked with the first thread part at one end of the first valve body through a first connecting part; and the first cavity and the second cavity are both formed in the first valve body. The one-way valve designed by the utility model can realize one-way filtration, prevents impurities in external air from entering the solution bottle when the valve body is in a negative pressure environment and is in an exhaust state, and simultaneously, when a solution is extracted, not only can sealing be realized, the contact between the external air and the solution be reduced, but also the volatilization speed of the solution can be reduced. 本实用新型提供了一种用于气相的单向阀，包括：第一阀体和第二阀体，所述第一阀体通过第二连接部与所述第二阀体其中一端的第二螺纹部连接锁紧；端盖，所述端盖通过第一连接部与所述第一阀体其中