Thermostatic valve

A thermostatic valve, comprising a valve body with a cavity being provided in the valve body, and a thermostatic actuating element and a first elastic element mounted in the cavity, wherein one end of the thermostatic actuating element is supported on the first elastic element, the valve body is provided with at least three ports, and the three ports comprise a first port, a second port, and a third port;

• wherein
• a first valve seat is further provided in the cavity, an outer diameter of the first valve seat is less than an inner diameter of a portion of the cavity corresponding to the first valve seat, and there is a distance between an outer side of the first valve seat and an inner side of the cavity;
• the thermostatic valve further comprises a relief ring and a second elastic element in the cavity, one end of the second elastic element abuts against the relief ring, at least one first passage is formed between the first valve seat and the relief ring or between the inner side of the cavity and the relief ring, in the thermostatic valve, the first passage is unblocked or blocked by the movement of the relief ring, in the case that the first passage is blocked, the relief ring is sleeved on the first valve seat, and, in the case that the first passage is unblocked, the thermostatic valve forms a third flow passage, and the third flow passage comprises the first port, the first passage and the third port;
• and
• the thermostatic valve further comprises a first valve opening at the first valve seat, in the thermostatic valve, the first valve opening is opened or closed by the movement of the thermostatic actuating element, in the case that the thermostatic actuating element opens the first valve opening, a second flow passage allows circulation of fluid, and the second flow passage comprises the first port, the first valve opening and the third port.