Working principle Of Pneumatic Butterfly Valve
The disc of the butterfly valve is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical channel, the disc around the axis of rotation, the rotation angle of 0-90°, rotation to 90°, the valve is in full open state. Butterfly valve structure is simple, small size, lightweight, only a few parts. The valve can be opened and closed quickly by rotating only 90°. The operation is simple and the valve has good flow control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop through the valve is very small, so it has better flow control characteristics. The butterfly valve has elastic seal and metal seal two types. Elastic seal valve, the seal ring can be embedded in the body or attached to the periphery of the disc.
Maintenance And Commissioning Of Pneumatic Butterfly Valve
1. Cylinder Inspection and maintenance plan
Usually do a good job of cylinder surface cleaning and cylinder cylinder shaft spring, every 6 months regularly open the cylinder cover check whether there is debris and moisture, and lubricating grease state. If the grease is missing or dry, the cylinder must be disassembled for a full maintenance clean-up and then add grease.
2. Body check
Every 6 months to check whether the body appearance is good, installation flange leakage, if convenient to check whether the body seal is good, no wear, and whether flexible operation of the Valve Plate, the valve has no foreign matter stuck.
Cylinder Block Disassembly And Assembly Methods And Points To Note
First remove the cylinder from the valve body, first remove the cylinder cover at both ends, remove the Piston must pay attention to the direction of the Piston rack, and then rotate the cylinder shaft clockwise with External Force to make the piston run to the outermost Close the valve hole and then slowly ventilated with air pressure gently piston out, but this method must pay attention to slowly ventilated, otherwise the piston will suddenly spurt out, a bit dangerous Then remove the catch spring from the cylinder shaft so that the cylinder shaft can be removed from the other end.
Then each part can be cleaned and greased. The parts to be greased are: cylinder wall and piston ring, rack and back ring, and gear shaft and ring. After adding lubricating grease, you should install it according to the order of disassembly and the reverse order of parts. You must pay attention to the position of the rack and Pinion Make sure that when the valve is open, the Piston shrinks to the innermost position, the upper groove of the gear shaft is parallel to the cylinder block, and when the valve is closed, the Piston extends to the outermost position, the upper groove of the gear shaft is perpendicular to the cylinder block.
Installation And Debugging Method Of Cylinder And Valve Body And Matters Needing Attention
First, the valve is closed by an external force, I. E. The valve shaft is rotated clockwise until the valve plate is in seal contact with the seat At the same time the cylinder is also placed in the valve shut-off state (that is, the small groove above the cylinder shaft is perpendicular to the cylinder body for clockwise rotation of the Valve shut-off) .
Then install the cylinder to the valve (the direction of installation can be parallel or vertical with the valve body) , then see whether the screw hole is aligned, there will not be too much deviation, if there is a little deviation, the cylinder block can be turned a little bit, and then tighten the screws.
Pneumatic butterfly valve debugging first check whether the valve accessories are fully installed, solenoid valve and muffler, such as not complete, not debugging, the normal air pressure of 0.6 MPA 0.05 MPA, before operation to ensure that the valve body without debris stuck in the valve plate, first commissioning operation with manual solenoid valve manual button (manual operation when the solenoid valve coil power loss, manual operation is effective; electric control operation when the manual torsion set at 0-bit coil power loss, manual operation is effective; 0-bit for the shut-off valve, 1-bit for the open valve, that is to open the electric valve, if the valve needs to shut-off valve, the loss of power for the shut-off Valve solenoid valve coil rotation 180 degrees can be installed) , and observe the Valve Operation Status.
If the manufacturer of pneumatic butterfly valve is found to be very slow in opening the valve at the beginning, but very fast after the operation, this situation is the valve closed too tight, just turn the stroke of the cylinder down a little (turn the stroke adjusting screws on both ends of the cylinder a little bit at the same time, run the valve to the open position, then turn off the air supply and adjust again) , turn the valve open easily, close the position and don’t leak. If the Muffler is adjustable muffler can adjust the valve switching speed, you need to adjust the muffler to valve switching speed appropriate open if too small, may make the valve does not work.
Post time: Jul-28-2021