The invention discloses a pressure
relief valve. The pressure
relief valve comprises a
valve seat and a valve shell with the two open ends. One open end of the valve shell is installed on the
valve seat, a cover is arranged on the top of the part, inside the valve shell, of the
valve seat, a sign post is fixed to the center of the cover, and the other end of the sign post is a free end and extends out of the other open end of the valve shell. A spring base is installed on the sign post in a sleeving mode, a
pressure sensor is arranged at the top of the spring base and is used for emitting continuous digital signals and transmitting the digital signals to the background, and the
pressure sensor and the spring base are prevented from moving axially along the sign post through a pressure regulation plate connected to the inner wall of the valve shell. Springs are installed at the part, between the spring base and the cover, of the sign post in a sleeving mode and are compressed. According to the pressure
relief valve, the
pressure sensor arranged at the tops of the springs can monitor the pressure values of the springs inside the pressure relief valve in real time, emit the continuous digital signals of the pressure values and transmit the digital signals to the background for monitoring, and therefore the reliability and the accuracy of the action of the pressure relief valve can be guaranteed.