The invention discloses a hydraulic valve. The hydraulic valve comprises a valve body, a valve core, a
valve seat, a valve cover, a
timer, a PLC controller, an operating
handle, a spring
valve seat, apower source switch, a reset spring, an annular oil bearing tank, a sealing cover, a pipeline, an upper membrane, a lower membrane, an upper oil port and a lower oil port. The valve core is arrangedbetween the part, extending into the valve body, of the
valve seat and the hydraulic valve cover. The PLC programmable controller is fixedly arranged at the right end of the valve cover, and one end of the PLC programmable controller is connected with the
timer. The annular oil bearing tank is fixedly arranged in the middle of the outer side of the valve body. The upper membrane is arranged at thetop of the spring valve seat, the lower membrane is arranged at the bottom of the valve core, and the upper oil port and the lower oil port communicate with a
main channel cavity. The hydraulic valveis convenient to install and high in safety, and can achieve
automation control. The upper membrane and the lower membrane can conduct isolation sealing on the inner cavity of the valve body and a driving component, and thus impurities in the outside world can be prevented from affecting cleanness of a medium. The PLC controller can effectively control the disconnection and
connection time of thehydraulic valve according to the arranged
timer, and thus the self-locking function of the hydraulic valve is achieved.