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Pneumatic butterfly valve is composed of pneumatic actuator and butterfly valve.The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve to open and close, and the pneumatic valve that realizes the activation action is mainly used as a shut-off valve, and can also be designed to have the function of adjustment or segment valve and adjustment. Increasing use on medium diameter pipes.
1. Working principle of pneumatic butterfly valve
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is in a fully open state. The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid 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 generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc.
2. Maintenance and debugging of pneumatic butterfly valve
2.1 Inspection and maintenance of solenoid valve and muffler
The solenoid valve is inspected and maintained every 6 months, mainly to check whether the solenoid valve is blocked by dirt and the spool can move freely, whether the muffler is blocked by dirt and whether it is unobstructed. Whether the air source is clean and free of moisture.
2.2 Cylinder inspection and maintenance plan
Clean the surface of the cylinder and refuel at the circlip of the cylinder shaft. Open the end cover of the cylinder every 6 months to check whether there is debris and moisture in the cylinder, as well as the state of grease. If the grease is missing or dry, the cylinder should be disassembled for comprehensive maintenance and cleaning, and then the grease should be added.
2.3 Valve body inspection
Every 6 months, check whether the appearance of the valve body is good, whether the installation flange is leaking, and if it is convenient to check whether the valve body is well sealed, whether there is no wear, and whether the valve plate operates flexibly, and whether the valve is stuck with foreign objects.
2.4 Cylinder block disassembly and assembly methods and precautions
First, remove the cylinder from the valve body, first remove the two ends of the cylinder cover, pay attention to the direction of the piston rack when removing the piston, and then use external force to rotate the cylinder shaft clockwise to make the piston run to the outside, and then close the valve. The hole is slowly ventilated and the piston is gently pushed out with air pressure, but this method must pay attention to slow ventilation, otherwise the piston will suddenly spray out, which is a bit dangerous! Then remove the retaining ring on the cylinder shaft, and the cylinder shaft can be taken out from the other end. Then each part can be cleaned and greased. The parts that need to be greased are: the inner wall of the cylinder and the piston sealing ring, the rack and the back ring, as well as the gear shaft and the sealing ring. After the grease is added, it must be installed in the reverse order of disassembly and parts. After installation, it must be installed in the reverse order of disassembly and parts. Be sure to pay attention to the position of the rack and pinion. Be sure to ensure that the piston is retracted when the valve is opened. In the inner position, the upper end groove of the gear shaft is parallel to the cylinder block. When the valve is closed, that is, when the piston extends to the outer position, the upper end groove of the gear shaft is perpendicular to the cylinder block.
2.5 Installation and debugging method of cylinder and valve body and matters needing attention
First put the valve in the closed state with external force, firstly put the valve in the closed state with external force, that is, rotate the valve shaft clockwise until the valve plate is in sealing contact with the valve seat, and at the same time put the cylinder in the closed valve state (that is, the small cylinder above the cylinder shaft). The groove is perpendicular to the cylinder body (for the valve that is turned clockwise to close the valve), then install the cylinder on the valve (the installation direction can be parallel or perpendicular to the valve body), and then check whether the screw holes are aligned, there will be no too much If there is a large deviation, if there is a small deviation, it is enough to turn the cylinder block a little, and then tighten the screws. When debugging a pneumatic butterfly valve, first check whether the valve accessories are fully installed, such as solenoid valve and muffler. At the first debugging operation, use the manual operation button of the solenoid valve (the solenoid valve coil is de-energized during manual operation, and the manual operation is valid; during the electric control operation, the manual twist is placed at the 0-position ring and the power is lost, and the manual operation is valid; 0-position In order to close the valve, the 1st position is to open the valve, that is, the valve will be opened by electricity, and the valve will be closed if the valve needs to be closed by electricity. condition. If it is found that the valve is very slow at the initial position of opening the valve during the commissioning and operation, but as long as the action is performed, it will be very fast after the action. After that, it is very fast. In this case, the valve is closed too tightly. Just adjust the stroke of the cylinder a little bit (adjust the stroke adjustment screws at both ends of the cylinder a little bit inward at the same time. When adjusting, you need to run the valve to the open position, and then set the Turn off the air source and then adjust it), adjust the valve to open easily, and close it in place without leakage. If the muffler is adjustable, the opening and closing speed of the valve can be adjusted, and the muffler needs to be adjusted to a suitable opening for the opening and closing speed of the valve. If the adjustment is too small, the valve may not move.
1. Working principle of pneumatic butterfly valve
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is in a fully open state. The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid 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 generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc.
2. Maintenance and debugging of pneumatic butterfly valve
2.1 Inspection and maintenance of solenoid valve and muffler
The solenoid valve is inspected and maintained every 6 months, mainly to check whether the solenoid valve is blocked by dirt and the spool can move freely, whether the muffler is blocked by dirt and whether it is unobstructed. Whether the air source is clean and free of moisture.
2.2 Cylinder inspection and maintenance plan
Clean the surface of the cylinder and refuel at the circlip of the cylinder shaft. Open the end cover of the cylinder every 6 months to check whether there is debris and moisture in the cylinder, as well as the state of grease. If the grease is missing or dry, the cylinder should be disassembled for comprehensive maintenance and cleaning, and then the grease should be added.
2.3 Valve body inspection
Every 6 months, check whether the appearance of the valve body is good, whether the installation flange is leaking, and if it is convenient to check whether the valve body is well sealed, whether there is no wear, and whether the valve plate operates flexibly, and whether the valve is stuck with foreign objects.
2.4 Cylinder block disassembly and assembly methods and precautions
First, remove the cylinder from the valve body, first remove the two ends of the cylinder cover, pay attention to the direction of the piston rack when removing the piston, and then use external force to rotate the cylinder shaft clockwise to make the piston run to the outside, and then close the valve. The hole is slowly ventilated and the piston is gently pushed out with air pressure, but this method must pay attention to slow ventilation, otherwise the piston will suddenly spray out, which is a bit dangerous! Then remove the retaining ring on the cylinder shaft, and the cylinder shaft can be taken out from the other end. Then each part can be cleaned and greased. The parts that need to be greased are: the inner wall of the cylinder and the piston sealing ring, the rack and the back ring, as well as the gear shaft and the sealing ring. After the grease is added, it must be installed in the reverse order of disassembly and parts. After installation, it must be installed in the reverse order of disassembly and parts. Be sure to pay attention to the position of the rack and pinion. Be sure to ensure that the piston is retracted when the valve is opened. In the inner position, the upper end groove of the gear shaft is parallel to the cylinder block. When the valve is closed, that is, when the piston extends to the outer position, the upper end groove of the gear shaft is perpendicular to the cylinder block.
2.5 Installation and debugging method of cylinder and valve body and matters needing attention
First put the valve in the closed state with external force, first put the valve in the closed state with external force, that is, rotate the valve shaft clockwise until the valve plate is in sealing contact with the valve seat, and at the same time put the cylinder in the closed valve state (that is, the small cylinder above the cylinder shaft). The groove is perpendicular to the cylinder body (for the valve that is turned clockwise to close the valve), then install the cylinder on the valve (the installation direction can be parallel or perpendicular to the valve body), and then check whether the screw holes are aligned, there will be no too much If there is a large deviation, if there is a small deviation, it is enough to turn the cylinder block a little, and then tighten the screws. When debugging a pneumatic butterfly valve, first check whether the valve accessories are fully installed, such as solenoid valve and muffler. At the first debugging operation, use the manual operation button of the solenoid valve (the solenoid valve coil is de-energized during manual operation, and the manual operation is valid; during the electric control operation, the manual twist is placed at the 0-position ring and the power is lost, and the manual operation is valid; 0-position In order to close the valve, the 1st position is to open the valve, that is, the valve will be opened by electricity, and the valve will be closed if the valve needs to be closed by electricity. condition. If it is found that the valve is very slow at the initial position of opening the valve during the commissioning and operation, but as long as the action is performed, it will be very fast after the action. After that, it is very fast. In this case, the valve is closed too tightly. Just adjust the stroke of the cylinder a little bit (adjust the stroke adjustment screws at both ends of the cylinder a little bit inward at the same time. When adjusting, you need to run the valve to the open position, and then set the Turn off the air source and then adjust it), adjust the valve to open easily, and close it in place without leakage. If the muffler is adjustable, the opening and closing speed of the valve can be adjusted, and the muffler needs to be adjusted to a suitable opening for the opening and closing speed of the valve. If the adjustment is too small, the valve may not move.
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