How long does the manufacturing standard of pneumatic rubber lined wafer butterfly valve open? The pneumatic butterfly valve in the main line of gas pipeline is mostly driven by the gas-liquid system. The gas-liquid drive system can be operated locally or controlled remotely. Since the pressure of the conveyed medium is variable, sometimes the friction torque of the sphere rotation is very large, or other accidents occur, making it difficult to start the pneumatic butterfly valve, which requires an emergency mechanism to input energy to the drive system to increase the pressure of the working medium. The pneumatic butterfly valve pneumatic drive system designed by Shanghai Dongfeng Pump and Valve Factory is equipped with a manual pressurization mechanism. This manual mechanism works reliably and has a certain working efficiency, and the labor consumption of the staff when opening and closing the pneumatic butterfly valve is also very small. A simple gas-liquid drive system is used to control the pneumatic butterfly valve installed in the main gas pipeline. The nominal diameter of pneumatic butterfly valve is 500mm, and the nominal pressure is 8MPa. The pressure vessel controls the opening and closing of the pneumatic butterfly valve. There are two phases of steam and liquid in the container, the lower half is filled with oil, and the upper half is fed with air from the compressor. The close operation or remote control of pneumatic butterfly valve can be realized by changing the air pressure. Under the action of compressed air, the oil in the container flows into the half cavity of the hydraulic cylinder through the middle of the filter, one-way throttle valve and manual reversing valve. The piston in the hydraulic cylinder is pushed by the pressure oil, and the piston drives the remote sensing to rotate the sphere of the pneumatic butterfly valve. At the same time, the oil in the other half of the hydraulic cylinder flows into another pressure vessel, and the air in the vessel is connected with the atmosphere. If the pressure of compressed air cannot overcome the friction force when the ball rotates, or an accident occurs and the source of compressed air is lost, in order to complete the opening and closing of the pneumatic butterfly valve, the manual reversing valve can be operated and the manual pressurization mechanism can be connected. The improved manual supercharging structure processes many channels on the middle plate, connects the pump, reversing valve and pipe joint as required, and the safety valve is also installed on the middle plate, which is very simple and small in structure. During manual rotation, the sliding block pushes two plungers to reciprocate, and the plunger pressurizes the oil in the closed chamber of the pump housing before it is used in the drive system. Low pressure suction and high pressure discharge of oil are realized through butterfly valve. The pump is double acting, so the load is stable and the efficiency is high. The technical characteristics of the hand pump are: 21 ml of oil is discharged every time the hand wheel rotates, the nominal oil discharge pressure is 5.2 MPa, and the maximum pressure can reach 8 MPa. At the nominal pressure, the force applied on the handle of the hand wheel is 180N
、 3. The electric drive butterfly valve has adjusted the opening and closing travel of the control mechanism before delivery. In order to prevent the power supply from being connected in the wrong direction, after the first power supply is connected, the user should first turn on the manual switch to the half open position, and then press the electric switch to check that the direction of the indicator plate is consistent with the closing direction of the valve.
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