Proportional throttle valve

The utility model discloses a proportional throttle valve which comprises a valve body, a valve element, a pilot valve and a marking assembly. The marking assembly comprises a marking ring A, numbers 0-9 and positioning holes A in one-to-one correspondence with the numbers are evenly distributed on the upper surface of the marking ring A in the circumferential direction, a marking ring B is coaxially arranged below the marking ring A, the marking ring B is rotationally connected with the marking ring A, and the outer diameter of the marking ring B is larger than that of the marking ring A; number 0-9 are evenly distributed on the upper surface of the part, exposed out of the mark ring A, of the mark ring B. Positioning holes B corresponding to the numbers one by one are further formed in the mark ring B. After the numbers on the mark ring A and the mark ring B are aligned, the positioning holes A right face the positioning holes B. A rotating ring is further coaxially arranged on the inner side of the mark ri