The electro-hydraulic control system is equipped with multiple adjustment points, which can be set up and closed according to different pipeline control requirements to ensure that the valve can automatically open and divide according to the preset time and angle when the conditions for opening and closing the valve are met. Slow two-stage shutdown. It can also close the valve without electricity, effectively eliminate destructive water hammer, prevent runaway accidents of water pumps and turbine units, reduce pressure fluctuations in the pipe network system, and ensure the safe and reliable operation of equipment. d.
The main valve sealing pair is a triple eccentric metal seal or a double eccentric rubber seal structure, which is easy to open and close, and the seal is reliable. There is an additional enlarged eccentricity, so that the valve has good self-closing and self-sealing performance. The medium and small diameter butterfly plates are designed into a streamlined flat structure, and the large diameter butterfly plates are designed into a double-plate truss structure.
The displacement is small and the water flow is smooth. The valve flow resistance coefficient is only 0.1 to 0.6, which is much smaller than the flow resistance coefficient of the check valve ( 1.7~2.6), the energy saving effect is obvious. According to the energy storage type of the control system, hydraulic control butterfly valves are divided into two categories: heavy hammer type (Figure 2-31) and accumulator type (Figure 2-32).
The valve is mainly composed of valve body, butterfly plate, valve shaft, sliding bearing, It is composed of sealing components and other parts. The heavy hammer valve body adopts the horizontal structure, and the valve shaft adopts the half shaft structure. The accumulator type generally adopts horizontal arrangement; it can also adopt vertical arrangement according to user requirements. The transmission mechanism is mainly composed of hydraulic cylinders, rocker arms, support plates (heavy hammers, levers, locking cylinders, etc.) and other connecting and transmission parts. It is the main actuator for hydraulic power to open and close the valve.