For lining fluoride pump valve: the valve leakage causes and maintenance methods do you know what?

Fluorine-butterfly water pump widely used for the application of the valve is also important, fluorine-butterfly pump lining fluoride plastic material, has the very good corrosion resistance, fluorine-butterfly water pump for pipeline is also very strict requirements and the valve, the valve has been widely used for pipe and pump, valve using long leakage failure is inevitable, processes is not good is also a big trouble, here are several kinds of valve leakage causes and maintenance methods: sealing leak reason: sealing surface grinding, cannot form a closed line. The joint of the valve stem and closing member centers are suspended, deviation and wear. Stem bending or assembly is not straight, make close a skewed. Improper material selection on sealing surface, sealing surface produce corrosion, erosion and abrasion. Overlaying welding and heat treatment did not produce according to the rules of operation, wear, corrosion, crack, etc. Sealing surface spalling. Maintenance method of sealing surface grinding, choose reasonable tool and abrasive, grinding after staining examination, no indentation, cracks, scratches and other defects. Stem and shut down a joint centers do not conform to the requirements, should undertake nap, centers should have a certain gap, stem shoulder and close the axial clearance of not less than 2 mm. Bending straightening stem, adjust the valve stem, stem nut, closed, seat on a common axis. Choose the corrosion resistant, resistant to abrasion performance conforms to the condition of the seal face. High temperature valve, shut off the cold in thin seam, after in the closed interval after a certain time to close again. Used as cut-off valve valve, don't allow for the use of throttle valve, relief valve, closing pieces should be in the fully open or close position, if you need to adjust the medium flow rate and pressure, should set the throttle valve and relief valve alone. Unable to adjust the sealing surface, change in time. Stem inflexible reasons: stem with it with a low machining accuracy, fit clearance is too small. Stem, stem nut, stents, gland axis, packing and so on is not a straight line. Too tightly on the packing. Stem bending, damage. Thread not clean or rust, poor lubrication condition. Nut loose, thread silk. Stem and actuator joint loose or damaged. Maintenance methods: improving the stem and stem nut processing precision and repair quality, make the clearance should be appropriate. When assembling the valve stem and its fittings, clearance is consistent, maintain concentric, rotating flexible. Too tightly on the packing, relax appropriately gland. Stem bending, should be corrected to difficult to correct, should be replaced. Proper operation of the valve stem, closing force. Stem, stem nut thread should often clean and add lubricating oil, the high temperature valve, shall be coated disulfide pin or graphite powder lubrication. Stem nut loose should repair, can't repair the timely replacement. Make the nut oil flow, good lubrication, often do not operate the valve, regularly check the valve stem and activities, found that the wear and killed phenomenon, timely repair stem nut, bracket and other accessories. Valve operating correctly, the force should be appropriate, lest make the stem deformation and damage. Is turned off, valve parts heat expansion, the valve is turned off, interval time, will be back the handwheel counterclockwise, a little to prevent stem to death. Packing reveal that the cause of the problem: choose wrong, and working medium corrosion resistance, temperature, pressure does not adapt. Packing installation is wrong, especially the whole root spare screw into the packing, the most prone to leak. Packing more than life, have aging, loss of elasticity. Insufficient packing laps. Stem machining accuracy and surface finish is not enough, or has the ovality, or have a notch. Improper operation, too hard. Maintenance methods: according to the working condition should choose packing material and type. Filling, packing should be by circle put pressure, joint should be into 30 & deg; Or 45 & deg; 。 Aging, damage the packing should be replaced in a timely manner. Packing shall be installed in a specified number of turns. Comply with operation procedures, in addition to the percussive handwheel, normal forces operating at a constant speed. Should be symmetrical tighten gland bolts evenly. Gasket leaking causes: gasket is not resistant to corrosion, high pressure, vacuum, high or low temperatures. Operation is not smooth, cause the valve pressure, temperature fluctuates up and down. Gasket compression force is not enough. Improper gasket assembly, uneven stress. Gasket surface rough, mixed with foreign body. Maintenance methods: according to the working condition should choose gasket materials. Careful adjustment, stable operation. Should be symmetrical and uniform screw down the bolt. Gasket assembly should force uniform, gaskets are not allowed to overlap and using double gasket. Installing a spacer pay attention to clean, seal face clean with kerosene.
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