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Butterfly valve test and installation troubleshooting methods

Wafer-Butterfly-Valve-01 Triple-Eccentric-Butterfly-Valve-300x300 
Butterfly valve test and adjustment:
1. The butterfly valve is a manual, pneumatic, hydraulic, and electric component that has 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, and apply pressure to the inlet side. Observe whether there is any leakage on the outlet side. Before the strength test of the pipeline, the disc plate should be opened to prevent damage to the sealing pair.
2. Although Diyue has undergone strict inspections and experiments before leaving the factory, there are also some products that automatically change their screw positions during transportation, requiring readjustment, pneumatics, hydraulics, etc., please refer to the operating instructions of the supporting drive device.
3. The opening and closing strokes of the control mechanism have been adjusted when the electric drive butterfly valve leaves the factory. In order to prevent the wrong direction when the power is turned on, the user first turns on the power manually to the half-open position after turning on the power for the first time, and then presses the electric switch to check that the direction of the indicator plate is consistent with the closing direction of the valve.
2. Common faults and elimination methods of butterfly valves:
1. Before installing the butterfly valve, confirm whether the performance of the butterfly valve and the arrow of the medium flow direction are consistent with the movement conditions, and the inner cavity of the Guilong valve should be inserted and cleaned. It is not allowed to have foreign matter attached to the sealing ring and the butterfly plate. It is not allowed to close the butterfly plate to avoid damage to the sealing ring.
2. It is recommended to use the special flange for the butterfly valve, that is, the HGJ54-91 type socket welding steel flange for the installation of the disc plate.
3. The best position for butterfly valve installation in the pipeline is vertical installation, but not upside-down installation.
4. The flow of the butterfly valve needs to be adjusted during use, and it is controlled by a worm gear box.
5. For the disc valve with a large number of opening and closing times, open the worm gear box cover in about two months to check whether the butter is normal. Keep a proper amount of butter.
6. Check the tightness of each connection part, which not only ensures the bee-like nature of the packing, but also ensures the flexible rotation of the valve stem.
7. Metal-sealed butterfly valve products are not suitable for installation at the end of the pipeline. If it must be installed at the end of the pipeline, an outlet flange must be installed to prevent the seal ring from being over-pressed and over-positioned.
8. Valve stem installation and use response Periodically check the valve use effect, and promptly remove any faults found.
3. The timely elimination methods of possible failures are detailed in the following table: Possible causes of the failures elimination method Sealing surface leakage 1. The butterfly plate and the sealing surface contain debris
2. The closing position of the butterfly plate and the sealing surface is not correct
3. The outlet side is equipped with flange bolts that are unevenly stressed or not according to the requirements of Figure 1. The direction of the pressure test is not according to the requirements of Figure 1.
1. Eliminate impurities and clean the inner cavity of the valve
2. Adjust the adjusting screw of the worm gear or electric actuator to achieve the correct closing position of the valve. 3. Check the mounting flange plane and the bolt tightening country. They should be tightened evenly.
4. Press in the direction of the tip seal
5. Leakage on both ends of the valve:
1. The sealing gaskets on both sides fail
2. Uneven or uncompressed pipe flange tightness
3. The upper and lower sealing gaskets of the sealing ring are invalid. 1. Replace the sealing gasket. 2. Tighten the flange bolts (even force). 3. Remove the pressure ring of the valve and replace the sealing ring. The failed gasket

Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.

Major products: Butterfly ValveBall Valve,Gate ValveCheck ValveGlobe Vavlve,Y-StrainersElectric Acurator , Pneumatic Acurators .



Post time: Jul-23-2021