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Needle valve instruction manual
1. Before installation, it is necessary to carefully verify whether the used needle valve meets the requirements for use, such as type, bore diameter, nominal pressure, and applicable medium.
2. Remove the impurities in the sealing surface of the valve chamber. Do not open or close the needle valve before removing impurities.
3, according to the characteristics of the media to select the right filler, and check whether the packing is compacted. However, it must not be too tight so as not to interfere with the rotation of the valve stem.
4. Test pressure according to the method described above and make a record.
5. When lifting, the sling is not allowed to be attached to the hand wheel, but should be tied to the valve body. It should be lightly lifted, and it must not be knocked and bumped to prevent damage to the needle valve, especially to prevent damage to the sealing surface and stem.
6. When the non-standard flange is connected with the needle valve, the non-standard flange should be parallel to the pipe flange, and the flange should be properly guarded against defects such as misalignment and open mouth. The jump gasket (oil-resistant rubber asbestos plate, Poly ethylene gasket) should be selected between the flanges. The gasket should be placed in the middle and must not be deflected. The bolts should be evenly and symmetrically tightened, not too tight or too loose. After the bolts are set, several feelers check whether the clearances of all parties are the same.
7. The needle valve with threaded connection should wrap the sealing material (polytetrafluoroethylene raw tape, lead linseed fiber) on the thread, and then tighten it. Take care not to get the sealing material into the valve chamber. For cast iron and non-metallic needle valves, the threads should not be overtightened to avoid bursting the needle valve.
8, when installing the welding needle valve, should be aligned, spot welding, and then open the valve flap, and finally the overall welding. After the welding is completed, check whether the weld has pores, slag inclusions, and cracks. After inspection, pipelines and needle valves should also be purged and flushed.