What is the difference between pneumatic duct sealing butterfly valve model dn40 and electric control valve? 2.4 Disassembly and assembly methods and precautions of cylinder block First remove the cylinder from the valve body, first remove the covers at both ends of the cylinder, and when removing the piston, be sure to pay attention to the direction of the piston rack, then rotate the cylinder shaft clockwise with external force to make the piston run to the outermost edge, and then gradually ventilate the valve closing hole to gently eject the piston with air pressure, but this method must pay attention to gradually ventilate, Otherwise, the piston will burst out suddenly, which is a bit risky! Then remove the circlip on the cylinder shaft, and the cylinder shaft can be taken out from the other end. Then each part can be sorted and greased. The parts to be greased are: cylinder inner wall and piston seal ring, rack and back ring piece, gear shaft and seal ring. After lubricating grease is added, the equipment shall be installed in the order of disassembly and in the reverse order of parts. Attention must be paid to the orientation of the gear rack. It must be ensured that the end slot on the gear shaft is parallel to the cylinder block when the piston is retracted to the innermost position when the valve is opened, When the valve is closed, that is, when the piston extends to the outermost direction, the end groove on the gear shaft is straight with the cylinder block. Maintenance and commissioning of pneumatic butterfly valve
、 Method 5: Replace the sealing gasket. Nowadays, most of them use asbestos board as the sealing gasket. In fact, it has poor sealing performance under high temperature and can not be used for long. In this case, spiral wound gasket can be used for better effect.
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