Pneumatic butterfly valve consists of two parts, namely, pneumatic actuators and butterfly valve. Pneumatic butterfly valve is used as the valve rod rotation circular disc to do, to be opened in order to realize the opening action of main block valves use pneumatic valve, can be designed to have a adjustment or section of the valve and the adjustment function, at present the use of butterfly valve on the low voltage and medium caliber pipeline more and more. The working principle of pneumatic butterfly valve butterfly valve butterfly plate installed on the diameter of the pipe direction. Cylindrical channels in butterfly valve body, disc disc around the axis of rotation, rotation Angle for 0 ° - Between 90 °, rotate to 90 °, the valve is in the fully open position. Butterfly valve has simple structure, small volume, light weight, only by a few parts. And only need to rotate 90 ° can rapid opening and closing, simple operation, at the same time, the Industrial Valves has good flow control characteristics. Butterfly valve in the fully open position, the butterfly plate thickness is medium flows through the body's resistance, thus produced by the valve pressure drop is small, it has good flow control characteristics. Butterfly valves have a seal and metal seal two kinds of seal type. Elastic sealing valve, sealing ring can be embedded in the body or attached to the butterfly plate peripheral. Pneumatic butterfly valve maintenance and debugging cylinder inspection maintenance plan completes the cylinder surface clean at ordinary times and cylinder shaft circlip refueling, regularly every 6 months will open check the presence of clutter in the cylinder and the cylinder cover water, as well as the state of grease. Such as lack of grease or already dry cylinder must be open for full maintenance cleaning after add grease. Body check every 6 months to check the body appearance is good, have installed flange without leakage, if it's convenient to check whether the body sealing is good, no wear and tear, and the valve plate operation is flexible, there are no foreign bodies stuck valve. Cylinder block disassemble and assembly method and the matters needing attention: first of all, will be removed from the valve body, cylinder first unwrapped cylinder heads, piston down when must pay attention to the direction of the piston rack, and then use outside clockwise rotating cylinder axis piston run to the outside, then close the Industrial Valves hole slowly ventilation with pneumatic piston top out gently. But this method must pay attention to ventilation slowly, or piston will suddenly, a bit dangerous! Then put the cylinder shaft circlip tear down, cylinder shaft can take out from the other end. For each part to clean up, and then you can add grease, add grease parts as follows: the cylinder wall and piston seal, rack and the back ring, and the gear axis and seal ring. After add good grease will press down order and place the order after installation will be installed in the disassembly sequence and place an order, it is important to note that the position of the gear and rack, make sure the piston in the open valve position gear shaft when the position of the shrinkage in the top slot parallel to the cylinder block, valve position when the piston into the outside to the position of the gear shaft upper trough and vertical cylinder block. Cylinder with the valve installation and debugging method and the matters needing attention: first, with external force on the valve closed, first with external force on the valve closed, the valve spindle (clockwise) down until it valve plate and valve seat sealing contact, also at the cylinder valves closed state ( Above the cylinder shaft into a small slot and cylinder ChuiZhiZhuang for clockwise to close the valve valve) 。 And then the cylinder is installed to the valve ( The installation direction parallel to the valve body or vertical) , see if the screw hole for again, won't have too big deviation, if you have a little deviation, cylinder block turning point, then tighten the screw. Debugging pneumatic butterfly valve check valve accessories whether the installation is complete, the electromagnetic valve and etc. , if there is not complete, not debugging, normal for a gas pressure of 0. 6MPA±0. 5 mpa, to ensure that the valve body without sundry card before running in the valve plate, for the first time debugging run-time electromagnetic valve with manual operation manual button ( Manual operation when the solenoid coil electric, manual operation is valid; Electric control operation is put manual twist at 0 bit circle lost electricity, manual operation is valid; 0 to close the valve, one was an open valve, quick open valve, valve losing electricity if you need to close the valve, will open a loss to close the valve solenoid valve coil installation can rotate for 180 degrees) running state and observation.
os & y valve fire protection double flanged gate valve is generally used to os&y gate valve.
For details on rising stem gate valve, see Shenzhen Mech Valve Trading Co., Ltd. at Mech Valve.
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