Pneumatic butterfly valve working principle and maintenance debugging method Pneumatic butterfly valve is composed of pneumatic actuators and butterfly valves. Pneumatic butterfly valve is used with the rotation of the valve stem to do the opening and closing of the circular disc, in order to achieve the opening of the pneumatic valve action to do the main cut-off valve can also be designed to adjust or segment valve and adjust the function, the current butterfly valve at low pressure The use of medium caliber pipelines is increasing. Pneumatic butterfly valve works Butterfly butterfly valve installed in the pipe diameter direction. In the butterfly valve body cylindrical channel, the disc-shaped disc rotates about the axis, the rotation angle is between 0 ° -90 °, when rotated to 90 °, the valve is fully open. Butterfly valve structure is simple, small size, light weight, only a few components. And just turn 90 ° to quickly open and close, easy to operate, while the valve has good fluid control features. When the butterfly valve is fully open, the thickness of the disc is the only resistance to the flow of the medium through the valve body, so the pressure drop across the valve is small and therefore has good flow control characteristics. Butterfly valve seal and metal seal two types of seal. Flexible sealing valves, seals can be embedded in the body or attached to the butterfly plate around. Pneumatic butterfly valve maintenance and commissioning 1, check the cylinder maintenance plan Usually do a good job of cleaning the cylinder surface and the cylinder hinge card spring refueling, every 6 months to open the cylinder cover on a regular basis to check whether the cylinder debris and moisture, and grease status. Such as the lack of grease or dry the cylinder must be disassembled to do a comprehensive maintenance and then add grease cleaning. 2, body check Every 6 months to check the appearance of the valve body is good, there is no leakage of the mounting flange, if convenient to check the body seal is good, no wear and tear, and the valve plate is flexible, valve with or without foreign matter stuck. Cylinder block removal and assembly methods and precautions: First remove the cylinder from the valve body, the first two ends of the cylinder open, demolition piston must pay attention to the direction of the piston rack, and then use the external force to rotate the cylinder shaft clockwise to the outermost, and then close the valve Slowly ventilate the hole with a gentle pressure to push the piston gently, but this method must pay attention to slowly aeration, or the piston will suddenly spurt out, a bit dangerous! Then the cylinder shaft retainer removed, the cylinder shaft can be from the other end take it out. Then you can clean each component, add grease, grease to be added to the site: the cylinder wall and piston seals, rack and dorsal ring pieces, as well as the gear shaft and the ring. After the grease is added, the order of disassembly and the reverse order of the parts should be followed by the order of disassembly and the reverse installation of the parts. Be sure to pay attention to the position of the rack and pinion and ensure that the piston shrinks when the valve is opened When the innermost position is reached, the upper end groove of the gear shaft is parallel to the cylinder body. When the valve is closed, the piston extends to the outermost position, and the upper end groove of the gear shaft is perpendicular to the cylinder body. Cylinder and valve installation and commissioning methods and precautions: First of all, the valve placed in the closed state with an external force, first of all the valve placed in the closed state with an external force, that is, clockwise until the valve plate and valve seat seal contact, while the cylinder is also placed in the closed valve state The groove and the cylinder into a vertical shape for clockwise turn off the valve), and then install the cylinder to the valve (installation direction parallel to the valve body or vertical can), look at the screw hole is correct, there will be no Large deviation, if there is a little deviation, the cylinder block will be able to rotate a little, and then tighten the screws. Pneumatic butterfly valve debugging First check whether the valve parts are installed, solenoid valves and silencers, etc., if not complete, may not be debugged, the normal pressure for the gas supply 0.6MPA ± 0.05MPA, before operation to ensure that no body debris stuck in the valve plate At the first commissioning operation, manual operation of the electromagnetic valve manual button (manual operation solenoid valve coil power loss, manual operation is valid; electronic control operation will be manually twisted in 0 bit power loss, manual operation is valid; 0 To close the valve, a valve to open, that is, electricity to open the valve, loss of off valve for the closure of the valve, loss of power to open the valve for the solenoid valve is rotated 180 degrees can be installed) and observe the valve operation status. If found in the process of commissioning pneumatic butterfly valve valve manufacturer in the starting position is very slow, but as soon as the action is very fast, the process of testing found that the valve opening valve at the start position is very slow, but as long as the action is very Fast, this situation is the valve closed too tight, just a little smaller cylinder stroke can be (at both ends of the cylinder stroke adjustment screw at the same tune a little adjustment will be required to run the valve to the open position, and then the gas source off Off and then tune), transferred to the valve open easily, close leaks on the line. If the silencer is adjustable silencer you can adjust the valve switching speed, the silencer must be adjusted to the valve opening and closing speed suitable for open if the tune is too small, the valve may not move.
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Pneumatic butterfly valve working principle and maintenance debugging method
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