The valve is in the fluid system, is used to control the direction of the fluid, pressure, flow of the device, is to make the piping and equipment within the medium ( Liquid, gas, powder) Flow or stop and can control the flow of the device. , use process need on a regular basis for testing the performance of the valve, valve repair valve cleaning, and the sealing property of some test observation. To introduce valve repair grinding use process clean for you. 1, cleaning and inspection process: the sealing surface in the oil pan, use the professional cleaning agent, washing and check the sealing surface damage. With the naked eye is difficult to determine the tiny cracks of penetrant inspection method. After cleaning, check valve or gate valve and valve seat sealing surface of the seal, and check with red pencils. Red with red lead test, check the sealing surface printing, determine the sealing face seal; Or with a pencil strokes on the surface of the disc and seat sealing concentric circles, and then rotate the disc and seat seal, check the pencil circle erase, determine the sealing face seal. If seal is not good, can use the standard flat respectively test disc or disc sealing face and body sealing surface, determine the grinding area. 2, grinding process, grinding process is essentially no lathe cutting process, valve head or pitting or holes on the seat depth is generally at 0. Less than 5 mm, can adopt the method of grinding for maintenance. In the grinding process is divided into coarse grinding, grinding and fine grinding. Coarse grinding is to eliminate the scratch on the surface of the seal, indentation, and the corrosion defects, such as the sealing surface for high flatness and roughness, lays the foundation for the sealing surface of grinding. Coarse grinding with grinding head or the grinding tool, the use of coarse sand paper or coarse grinding paste, 80 # - its granularity 280 #, coarse grained, cutting quantity is big, high efficiency, but cutting grain is deeper, sealing surface is rough. Therefore, coarse grinding as long as the flat remove the valve head or the seat of pitting. In grinding is to eliminate coarse grain on the surface of the seal, further improve the sealing surface flatness and roughness. Using fine sandpaper or fine-grained grinding paste, its granularity is 280 # - W5, fine granularity, small amount of cutting, which is beneficial to reduce roughness; A corresponding tool should be replaced at the same time, the tool should be clean. After the grinding, the valve of the contact plane should reach the light. As with a pencil in the valve head or seat strokes, the Industrial Valves head or to light on a business trip, the seat should be erased pencil line. Fine grinding is a process with the end of the valve grinding, main is to improve the sealing surface finish. Fine grinding W5 available or finer micro diluted, such as engine oil, kerosene, with valve valve head to grinding of the valve seat, and don't have to play, it is more advantageous to seal face seal. When grinding clockwise turn 60 - in general Around 100 °, and then turn 40 - the opposite direction About 90 °, gently for a while, you have to check once, for grinding light, bright, and on the valve head and valve seat can see a very fine line, color to black black, gently with the oil mill again several times, with a clean cloth to wipe clean can. Grinding after and other defects, which should be assembled as soon as possible, lest destroy a good valve grinding head. Manual grinding fine grind or coarsely ground, throughout all is always raise and lower; Rotation and reciprocating; Tap, reversing combined operations such as grinding process. Its purpose is to avoid the particle trajectory, uniform grinding tool and sealing surface, and improve the sealing surface flatness and roughness. 3, the inspection stage: throughout the testing phase in the process of grinding, its purpose is to grasp the grinding conditions at any time, accomplish know fairly well, make the grinding quality to meet the technical requirements. It should be noted that different valve adapt to all kinds of sealing surface form should be used when the abrasive grinding tool, in order to improve the grinding efficiency and ensure the quality of grinding. grinding a very meticulous work, need in practice experience, groping, improving continuously, sometimes grinding is very good, but after mount or leakage is leaking, this is because in the process of grinding with grinding partial imagination, hand grinding rod is not vertical, skewed, or deviation caused by the size of tool Angle.
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