1, 1) relief valve leakage Scale, scale, debris falls on sealing surface, such as the available manual exhaust ( Steam) Purging or open it to clear. 2) The sealing surface of mechanical damage or corrosion. Available after grinding or cutting grinding method of repair or replacement. 3) Spring because of the excessive load failure or spring because of corrosion fall, spring, spring should be changed. 4) Stem bending deformation or valve core and Industrial Valves seat bearing surface deflection, should find out the reason, repackaging or replace the valve stem and other parts. Lever type relief valve lever and fulcrum deviation occurs, the valve core and valve seat uneven, should be corrected the center line of the lever. 2, is not in the adjustment of the pressure relief valve action 1) The pressure safety valve adjustment, ignoring the actual work medium characteristic and the influence of working temperature, must be readjusted. In the condition of hot continuous adjustment can't more than three times. Otherwise, the pressure value error is bigger, can't in normal debug action under pressure. 2) Sealing surface for medium pollution or crystalline produce adhesion and rust; Need to blow off valve, serious when need to grind the valve core and valve seat. 3) Stem with lining suites gap is too small, stuck when heated inflation; Need to appropriately increase the clearance between the sleeve and the valve stem. 4) Adjust or improper maintenance, spring type safety valve spring contraction too tight or close degree is not enough, the lever of the relief valve rust plate is overweight or too light, need to adjust the relief valve. 5) The valve passage blocked by obstacles such as blind flange; Should keep clear of obstructions. 6) Spring spring produce permanent deformation, should be replaced. 7) Relief valve selection is undeserved, as in the back pressure fluctuation big occasions, choose the non-equilibrium safety valve, etc. , need to change the corresponding type of safety valve. 3, 1) relief valve is less than fully open Nominal pressure relief valve selection, spring stiffness is too big, need to choose the relief valve. 2) Improper adjustment ring, it is necessary to readjust. 3) The disc friction in the guide sleeve is too big, need cleaning, grinding, or replacement parts. 4) Improper safety valve exhaust steam pipe, gas ( Steam) Flow resistance is big, need to adjust the discharge line. 4, 1) disc oscillation Clearance is too large, adjusting ring and disc must be readjusted. 2) Emissions of the relief valve discharge in large volumes of too much than necessary for the container, should resume selection, matching. 3) Relief valve inlet pipe load area is too small or resistance is too large, the exhaust valve ( Steam) Quantity is in short supply, need to change or adjust the relief valve inlet piping. 4) Discharge pipe resistance is too large, deal with pipeline to adjust to minimize resistance. 5, the disc is not back in time 1) Disc friction resistance in the guide sleeve, gap is too small or not coaxial, shall be washed, grinding or replacement parts. 2) Disc of opening and facility has not adjust good, should be readjusted. The spring safety valve, can be adjusted by adjusting the spring pressure force its opening pressure; By adjusting the adjusting ring position can adjust its back pressure. 3) The perpendicularity of the relief valve to exceed bid, should be looking for vertical anew. 4) The relief valve seat sealing surface crack boiler and pressure vessel. When the relief after debugging never up a case, may be rain from exhaust steam pipe into the valve body with high temperature medium produces cold shock, lead to valve seat sealing surface crack. Suggest adding cover exports to exhaust steam pipe. While eliminating crack valve seat sealing surface, if necessary, to replace the relief valve. All in all, the relief valve is an important part of a boiler pressure vessel. Parts are prone to failure. Control of the boiler pressure vessel safety valve, from the relief valve type selection, installation, commissioning, operation, maintenance and repair the whole process of quality control, safety supervision if a link error, are likely to cause the boiler pressure vessel accident. In recent years because the problem of safety valve of boiler and pressure vessel accidents often occur. Safety valve for the boiler pressure vessel, therefore, only from the type selection, installation, debugging, operation maintenance and repair each process strictly controlled, earnestly implementing standards, code requirements, can be in the state of overpressure boiler and pressure vessel, the pressure relief valve must be able to takeoff, to protect the safety of the equipment. To ensure the safe and economic operation of boiler &pressure vessel.
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