Abstract: A method for predicting valve leakage, comprising following steps: 1) prefabricating a valve; 2) mounting, on the valve, a sensor (70) and a signal transmitter (90); 3) debugging the valve, measuring and determining a critical specific pressure of a sealing face, and preconfiguring the critical specific pressure into the signal transmitter (90); 4) detecting, by the sensor (70), the specific pressure of the sealing face in real time, and transmitting a specific pressure signal to the signal transmitter (90); and 5) comparing, the signal transmitter (90), the detected specific pressure of the sealing face with the critical specific pressure to determine whether the valve is about to leak, i.e., determining that the valve is well sealed and providing no alert when the detected specific pressure of the sealing face is greater than the critical specific pressure.

Abstract: A self-compensated sealed rotary cone valve core, comprising a valve sleeve, wherein an upper part of the valve sleeve is provided with an axial through hole; a lower chamber of the valve sleeve is provided with a conical surface coaxial with the axial through hole; an inlet cavity is formed in the cone platform; a through hole communicated with a water outlet in a side wall of the lower part of the valve sleeve is formed in a side wall of the inlet cavity; a screw rod part of the core shaft penetrating through the valve sleeve is sequentially sleeved by a limiting piece and a spring gasket and is locked by a screw nut to realize pre-tightening sealing and rotary positioning with the valve sleeve. The valve core is simple in structure and convenient to process and mount, self-sealing and wear self-compensation can be achieved.

Abstract: A self-compensated sealed rotary cone valve core, comprising a valve sleeve, wherein an upper part of the valve sleeve is provided with an axial through hole; a lower chamber of the valve sleeve is provided with a conical surface coaxial with the axial through hole; an inlet cavity is formed in the cone platform; a through hole communicated with a water outlet in a side wall of the lower part of the valve sleeve is formed in a side wall of the inlet cavity; a screw rod part of the core shaft penetrating through the valve sleeve is sequentially sleeved by a limiting piece and a spring gasket and is locked by a screw nut to realize pre-tightening sealing and rotary positioning with the valve sleeve. The valve core is simple in structure and convenient to process and mount, self-sealing and wear self-compensation can be achieved.