A CHARGING AND DISCHARGING FITTING

A charging and discharging fitting includes a clamping ring (1) and an inner-threaded ring (2), the inner diameter of the clamping ring (1) is larger than the inner diameter of the inner-threaded ring (2), the clamping ring (1) is coupled fixedly with the inner-threaded ring (2), and there is a gap (3) between the bottom surface of the clamping ring (1) and the top surface of the inner-threaded ring (2). The invention adopts the structure of clamping ring (1) and inner-threaded ring (2), and the sealing effect thereof is excellent. By cooperating with the corresponding tool, the fitting can easily charge and discharge the liquid, and the liquid is not prone to leakage during the charging or discharging. La présente invention concerne un raccord d'entrée et d'évacuation qui inclut un collier de serrage (1) et une bague intérieurement filetée (2), le diamètre intérieur du collier de serrage (1) étant plus grand que le diamètre intérieur de la bague intérieurement filetée (2), le collier de serrage (1) est coupl