Midline butterfly valve, wafer type (D71X)

1, before installation should be on the butterfly valve specifications, pressure, temperature, corrosion resistance to meet the requirements of use. All parts shall be inspected for damage or looseness.
2. The butterfly valve can be installed on pipelines at any angle, and it is advisable to close the installation. When welding pipeline flanges, the valve sealing port should be blocked with a plate to prevent particles and debris from damaging the sealing surface. After welding, remove the valve, clean the valve sealing surface and the inner cavity of the pipeline, and then install the fixed valve.
3. When installing, please pay attention to the pressure direction of the valve in the closed state.

4. Before installation, the sealing surface (both ends of the sealing surface, butterfly plate sealing surface, valve seat sealing surface) should be thoroughly wiped clean to remove dust and dirt.
5, before installation should empty test butterfly valve, opening and closing should be flexible, opening and closing position and pointer position consistent 6, manual operation clockwise to close, counterclockwise to open, pointer indicates in place after no longer force opening and closing valve.
7. When the valve is subjected to pressure test, single flange is not allowed to be used for installation and pressure test, but double flange must be used for installation and pressure test. The bolts shall be fastened symmetrically and alternately, and shall not be fastened separately in turn. 9. The limit bolts have been adjusted before leaving the factory, and shall not be adjusted easily. If the driving device is configured as electric or pneumatic, please read the manual of the supporting driving device.
10, found that the valve opening and closing disorders should be identified for repair and exclusion, to prevent the use of force method to switch the valve, resulting in damage to the valve. 11, the valve failure is really can not be ruled out, please inform the company will do a good job of product installation and after-sales service for you.

If the valve does not have other special requirements, can be ordered according to the valve number, which requires the user to order the product, understand the valve number description, although this is more difficult for the user, but the user according to the parameters of the product they need to select the appropriate number, can ensure that the valve provided in full compliance with user requirements.

1, storage, the valve channel at both ends need to be blocked with a cover plate, stored in a dry and ventilated indoor long-term storage should often check, remove dirt, and in the exposed processing surface coated with anti-rust oil to prevent corrosion.
2. The valve must be stored in a dry room. It is not allowed to place the valve in the outside world to avoid damage to the valve.
3. Before the valve is transported, the valve must be tested and debugged in the way required by the contract or the standard to prevent the user from misoperation. For pneumatic or electric ball valves, the power source requirements of the corresponding device must be listed according to the manual of the pneumatic device or electric device. If the user needs to test and inspection, must be carried out in accordance with the requirements of the standard to prevent the test method is wrong and the product can not achieve the desired performance, the valve pressure test is over, the valve cavity should be cleaned up before storage.
4. When installing the valve, the cover plates at both ends of the valve should be removed. For the valve connected by the welding end, measures should be taken to protect the valve during the welding and installation of the valve and the channel to prevent the high temperature from causing adverse effects on the valve. 5. For valves with installation direction, the valve body should be marked with direction arrows to prevent installation errors.

1. Manual valve: when the handle is in the parallel position of the pipeline, the valve is in the open position, and when it is 90, the valve is in the closed position. Turn the handle clockwise to close the valve, and turn the handle counterclockwise to open the valve.
2, worm gear drive valve: according to the valve on the part of the installation of the indicating device for identification, clockwise rotation of the handle to close the valve, counterclockwise rotation of the handle to open the valve. 3, pneumatic, electric, gas-liquid linkage, electro-hydraulic linkage operation of the valve: in accordance with the relevant driver instructions to operate.