Check valve, refrigerant pipe system provided with same, and method for assembling same

The invention relates to a check valve, a refrigerant pipe system provided with the check valve, and a method for assembling the same. The check valve includes: a valve body configured to be movable in a lengthwise direction of a refrigerant line inside the refrigerant line; a stopper coupled to a rear end portion of the valve body to restrict movement of the valve body; and an elastic member disposed between the valve body and the stopper and providing an elastic force to the valve body. 本发明涉及一种止回阀、具备该止回阀的制冷剂管系统以及其组装方法。止回阀包括：阀门主体，配置为在制冷剂管线内部可沿所述制冷剂管线的长度方向移动；止动件，结合在所述阀门主体的后端部，限制所述阀门主体的移动；以及弹性部件，配置在所述阀门主体和所述止动件之间，向所述阀门主体提供弹力。