Common faults of pneumatic butterfly valve and solutions! Test and adjustment of pneumatic butterfly valve
1. The manual, pneumatic, hydraulic and electric parts of butterfly valve have been strictly debugged before leaving the factory. When rechecking the sealing performance, the user should evenly fix both sides of the inlet and outlet, close the butterfly valve, apply pressure to the inlet side, and observe whether there is leakage at the outlet side. Before the strength test of the pipeline, the disc should be opened to prevent damage to the sealing pair.
2. Although the pneumatic butterfly valve has been strictly inspected and tested before delivery, some products have automatic screw displacement during transportation, which requires readjustment, pneumatic, hydraulic, etc. Please read the operating instructions of the supporting drive device.
3. The electric drive butterfly valve has adjusted the opening and closing travel of the control mechanism before delivery. In order to prevent the power supply from being connected in the wrong direction, after the first power supply is connected, the user should first turn on the manual switch to the half open position, and then press the electric switch to check that the direction of the indicator plate is consistent with the closing direction of the valve.

When is the stainless steel pneumatic butterfly valve scrapped
The stainless steel pneumatic butterfly valve has strong corrosion resistance and long service life, but in the long-term use process, due to problems in the product itself and use, the stainless steel pneumatic butterfly valve will reach the scrap standard in advance. In order to help you identify the scrapped products, the stainless steel pneumatic butterfly valve needs to be scrapped in the following 6 cases:
1. Weld cracking.
The flexible bellows section of stainless steel pneumatic butterfly valve mostly adopts longitudinal seam welded pipe. The pipe strength is often insufficient due to the quality defects of longitudinal seam welding itself, leading to cracking and damage at the weld. The damage is due to the quality problem of longitudinal weld of bellows, so the control of weld quality should be strengthened.
2. Blasting occurs due to insufficient pressure resistance.
Due to the high pressure and temperature of the conveying medium, the pressure of the corrugated pipe is not enough to withstand the pressure, resulting in slope explosion. This kind of damage is caused by the design and selection error, so the selection should be carried out in strict accordance with the hose design and selection standards, and the parameters of the bellows and the mesh sleeve should be determined.
3. Fatigue failure.
Under dynamic working condition, pneumatic butterfly valves are often subject to fatigue crack damage under cyclic load. In order to prolong the service life, it is necessary to ensure that the hose is correctly designed, selected and installed, and that no additional stress such as twisting occurs to the hose.
4. The steel wire mesh sleeve of stainless steel pneumatic butterfly valve is pulled off.
The wire mesh sleeve is pulled off due to faulty welding. Due to the welding quality, the hose, ring and wire mesh sleeve are subject to faulty welding (over burning or final welding) of some wires during the trinity welding process.