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Views: 896     Author: Site Editor     Publish Time: 2020-01-29      Origin: Site

Ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal administration, iron and steel and other industries, and occupy a significant position in the national economy. Ball valve, ball valve for steam, butterfly valves, check valves, forged steel valves are used in various industries. If there is a problem with the ball valve, how to repair and replace it? This article tells you the answer.



How to repair and clean the ball valve

When the ball valve is closed, there is still pressurized fluid inside the valve body. Before maintenance, release the pressure of the pipeline and leave the valve in the open position. Disconnect the power or gas source. You must first confirm that the pressure on the upstream and downstream pipes of the ball valve has been relieved before performing disassembly .


When disassembling and reassembling, you must be careful to prevent damage to the sealing surfaces of the parts, especially non-metallic parts. The bolts on the flange must be tightened symmetrically, gradually and evenly during assembly. The cleaning agent should be compatible with rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve.


Non-metal parts should be taken out of the cleaning agent immediately after cleaning, and should not be soaked for a long time; after cleaning, it must be assembled after the cleaning agent on the wall surface is evaporated, but it should not be left for a long time, otherwise it will rust and be polluted by dust. Do not allow metal debris, fibers, grease, dust, and other impurities to contaminate, adhere, or stay on the surface of the part.



How to replace the ball valve

Keep the ball valve in a half-open position to flush and remove the dangerous substances that may exist inside and outside the valve. Close the ball valve, remove the connecting bolts and nuts on the flanges on both sides, and then completely remove the valve from the pipeline. Disassemble the driving device in sequence-the actuator, the connecting bracket, the lock washer, the stem nut, the butterfly spring, the Glam, the wear-resistant sheet, and the stem packing. Remove the body cover connecting bolts and nuts, separate the bonnet from the valve body, and remove the bonnet gasket. Make sure the valve ball is in the "off" position, which makes it easier to remove it from the valve body and then remove the valve seat.


Clean and inspect the removed parts. It is highly recommended to replace the seals such as the valve seat and bonnet gasket with a spare parts kit. Assemble in the reverse order of disassembly. Cross-tighten flange bolts and nuts with specified torque. After installing the actuator, input the corresponding signal to drive the valve core to rotate by turning the valve stem to make the valve to the open and closed positions. If possible, perform pressure seal testing and performance testing of the valve according to relevant standards before reinstalling the pipeline.


Ball valve has a long service life and maintenance-free period will depend on several factors: normal working conditions, maintaining a harmonious pressure ratio, and reasonable corrosion data. Contact us to provide you with various types of high quality valves.


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