A position indicating device of a valve body dynamic sealing ring is provided with a circular tube shell provided with a front end cover and a rear end cover, a communicating shaft which passes through the front and the rear end covers and is respectively connected with a front
rocker arm and a rear
rocker arm at the two ends, a sliding block articulated at the outer end of the front
rocker arm, a flushing
pipe that is connected between the front end cover and the rear end cover, a short circular tube that is provided with a radial support
saddle at the rear end and is connected with the rear end cover, a cambered long narrow hole arranged on the support
saddle, a round orifice arranged at the outer end of the rear rocker arm, a
threaded rod connected between the cambered long narrow hole and the round orifice arranged at the outer end of the rear rocker arm, and a proximity switch that is arranged between the outer end of the rear rocker arm and the support
saddle and is respectively corresponding to the on and the off states of the valve body dynamic sealing ring. The position indicating device uses the communicating shaft which is respectively connected with rocker arms at the two ends for transmitting the movement of the valve body dynamic sealing ring, the communicating shaft is arranged in the circular tube shell that is installed in a mounting hole of the valve body, and sealing pairs are respectively arranged between the communicating shaft and the shell and between the shell and the mounting hole; when in use, impurities such as
silt and the like in
liquid medium can not enter the shell, so that the accurate indication of combination and separation between valve body dynamic sealing ring and a butterfly plate sealing ring is not influenced.