Failure: the sealing surface leakage analysis for production reasons 1. Valve mounting direction and medium flow does not conform; 2. the valve is closed is not in place; 3. long-closed valve sealing surface fouling; 4. sealing surface slight rubbing injury; 5. Seal face serious damage; failure to eliminate 1. Note check valve is installed; 2. readjust speed screw actuators on BQ41F) sealed insulation valve, shutting the place; 3. the valve open a crack, so that the high-speed liquid flush fouling; 4. High-speed shims to compensate; 5. Re-grinding, high speed pads compensation; Cause and Remedy valve failure: handle, hand wheel damage analysis for production reasons: 1. The use of incorrect; 2. loose fasteners; 3. handle, hand wheel and stem connector damage; failure Remedy: 1. Never use a pipe wrench, longer lever, impact tools; 2. Repair any time matching; 3. Repair any time; two-pass soft (hard) sealed insulation valve price BQ41F, China Everbright Ltd. valve model provided by Shandong Everbright valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) strong, credible, Shandong Weifang ball industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Everbright valve into the brilliant and you work for a better future!