Common fault causes the prevention and elimination method of closed lax stem centers indelible or impending, gate seal and downs stem roof should be repaired, after silk indelible centers should resist close pieces and has the certain activity clearance seal face drops wedge centers between double ram adjusting pad replacement thick pad, parallel double ram thickening or replace the top cone ( Wedge) , single ram structure should be replaced or surfacing again sealing surface double wedge type gate off right choose double wedge type gate valve gate, cage attention to regularly check and repair the Industrial Valves stem and disc off right choose gate valve, operating force appropriate distortion of guide rail and deflection check, adjust after removal upside is disassembled should tag ram sealing surface scratch is unfavorable in containing abrasive medium use gate valve; Repeatedly between closing process, the sealing surface with fine seam, use medium wash away the abrasive grain and foreign body leak sealing surface adjustment improper or loose parts damage; The pattern of gland nut loose; Packing type adjustment screw top dead plug; Sealing spring top tight force is too small or spring damage should properly adjust the plug valves to adjust parts, such as the rotating lightweight and seal leakage shall prevail; Tight compression nut loose after tighten, thread damage should be replaced; Packing type adjustment screw under the appropriate depth and tight, after sealing spring tension force should be appropriate, damage should be replaced in a timely manner after sealing drainage holes was chocked up with dirt, lost since the tight seal periodic inspection and cleaning performance, should not be used for medium containing sediment more common failure reasons for the prevention and elimination method can't afford to open fracture T T slot should be circular transition, improve the quality of casting and heat treatment, open the top dead center while single ram card die closing force appropriate within the body, don't use the long lever stem nut failure within the stem nut is unfavorable and corrosive medium in stem top closed after heated die stem should be interval time after closing, the Industrial Valves stem a unloading, will be a little stem handwheel reverse rotation is not flexible sealing surface pressure tight: the pattern nut screwed tight, sealing of preloaded spring pressure tight appropriate adjust the sealing surface of clamping force. Appropriate relax tight pattern nuts and sealing preloaded spring sealing surface scratch repair regularly, oil seal oil gland type should be regularly pressure tight appropriate relax lubrication conditions deteriorate packing assembly, appropriate coating graphite, oil seal cock valve timing gas wrench a indelible to correct operation, wrench damage should be repaired
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