Among the pressure reducing valves, what is the difference between the pressure reducing valve of hydropower station and the ordinary pressure reducing valve? Can the ordinary pressure reducing valve be used in the technical water supply system of hydropower station?
a: general pressure reducing valves cannot be used. Here, I think it can be explained by the valve in the hydraulic system. General pressure reducing valves include fixed differential pressure reducing valves, fixed value pressure reducing valves and fixed ratio pressure reducing valves, which are generally referred to as fixed value pressure reducing valves. If this is the case, the valve cores of the overflow valve, the pressure reducing valve and the sequence valve can all be made the same, and the system pressure can be controlled by controlling the size of the throttle with the valve core combined with the base. If we want to talk about the difference between the three, that is: the outlet of the overflow valve is connected to the oil tank, and the feedback pressure comes from the pressure of the imported oil; The outlet of the fixed value pressure reducing valve is connected with the working oil circuit, and the feedback pressure is the outlet pressure; The sequence valve is the same as the overflow valve except that the outlet is not connected to the oil tank but to the working oil circuit. In fact, if only the principle is considered, the overflow valve and the sequence valve can be universal. The same point of the pressure reducing valve of hydropower station is that the pressure is reduced by controlling the throttling area. The difference is that the pressure reducing valve of hydropower station can feed back different pressure values to the control valve through the change of water head, and the pressure water of the control valve enters the pressure regulating cavity again, so as to overcome or relax the spring force for work; Keep the pressure behind the valve constant. Finally, I suggest that Xiangtan Zhongji's high proportion pressure reducing valve can be selected, that is, the pressure value behind the valve can be kept unchanged, and its safety locking nut can lock the valve without overpressure. Safe, reliable and convenient!
Huang chuntao