Maintenance Notes of Ball Valve
If we want to make the ball valve has a longer service life and maintenance free period, in addition to the normal working conditions, maintaining a harmonious temperature and pressure ratio, as well as reasonable corrosion data, will also rely on the following factors to do a good job:In the closed state of the ball valve, the valve body there is still pressurized fluid.Ball valve maintenance, disconnect the power supply or gas source.Before the repairing, the actuator and the bracket are cleaned.Must first identify the ball valve, the downstream pipeline has been to remove the pressure, in order to disassemble the decomposition operation.Decomposition and re assembly must be careful to prevent damage to the sealing surface of the parts, especially non-metallic parts.Use special tools for O circleSanitary ball valve assembly flange bolts must be symmetrical, step by step, evenly tightened.Cleaning agent should be with the rubber ball valve,Plastic parts, metal parts and working media (such as gas) are compatible.Working medium is gas, and using gasoline cleaning metal parts.Clean water or alcohol for non-metallic partsTo break down the individual parts can be cleaned using immersion method.The metal still did not break down the left can be used to clean fine clean silk impregnated with cleaning agents (to prevent adhesion of fiber loss on the part)When cleaning, it is necessary to remove all grease, dirt, glue, dust and so onNon-metallic parts should be removed immediately after cleaning agent, not long soakThe need to be cleaned by washing the wall after volatile cleaning agent (cleaning agent can not dip silk rub) assembly.But not for a long time, otherwise it will rust, dust pollutionNew parts should be cleaned before assemblyGrease lubrication.The grease should be compatible with the ball valve metal material, rubber parts, plastic parts and working medium.A thin layer of lubricating grease is coated on the surface of the seal installation groove, and a thin layer of grease is coated on the rubber sealThin greaseMetal debris shall not be allowed during assembly,Fibres and oils dust and other impurities must be cleaned,Foreign bodies, such as pollution, adhesion or stay on the surface or into the inner part of the cavity, the filler must be locked again.If there is a slight leakage in the packing, lock the nut. Note: do not lock too tight, usually locked 1/4 laps to 1 laps, the leak will stop.Replace seat and sealDisassembleTo make the valve in a semi open position, flushing, cleaning the body may exist in the dangerous substances.Close the ball valve, remove the flange on both sides of the connection bolts and nuts, and then remove the valve from the pipeline.In sequence disassembly driving device- actuator, a connecting bracket, a locking washer, stem nut, butterfly spring, glam, wear plates, valve stem packing.Remove the cover connection bolts and nuts, the valve cover and the valve body separation, and remove the valve cover gasket.Confirm that the manual ball valve is in the "off" position, which can be easily removed from the valve body, and then remove the valve seat.Take a hole in the body downward nudge stem until completely removed, and then take outO type ring and valve stem packing.Note: please be careful to avoid the surface of the valve stem and valve body packing seal.ReassemblyCleaning and inspection of the removed parts, it is strongly recommended to use spare parts package to replace the valve seat and valve cover gasket seal.Cross locking flange connecting bolts with specified torque.Lock stem nut with specified torque.After installing the actuator, entering the corresponding signal by rotating the valve stem drive spool rotation,Make the valve open and close position.If possible, please check and test the performance of the valve in accordance with the relevant standards before the installation of the pipeline.
