Check valve

The invention relates to a check valve, which comprises a valve body, and the valve body comprises a first part opening and a second part opening which are different; the valve core assembly comprises a bluff body and a valve clack mounted on the bluff body; wherein the valve clack comprises a first valve clack and a second valve clack which are connected with each other, the first valve clack is configured to be driven by fluid so as to open the first part opening, and the second valve clack is configured to be driven by the first valve body so as to open the second part opening; and the second partial opening is configured to be opened after the first partial opening is opened. 本申请涉及一种止回阀，所述止回阀包括阀体，所述阀体包括不同的第一部分开口和第二部分开口；阀芯组件，所述阀芯组件包括阻流体和安装在所述阻流体上的阀瓣；其中，所述阀瓣包括相连接的第一阀瓣和第二阀瓣，所述第一阀瓣配置为被流体所驱动从而打开所述第一部分开口，所述第二阀瓣配置为被所述第一阀体驱动从而打开所述第二部分开口，并且第二部分开口配置为是在第一部分开口打开之后打开的。