Knife Gate Valve Malfunctions Possible Malfunctions Probable Causes of Trouble Remedy Sealing Leaks Seals Clean the Sealing Surface Seal Damage Replace the Sealing Ring or Grind Sealing Surface Sealing Seals Leak Sealing Loose Loosen Tighten the packing or gland On the bolt on the sealing filler failure Fill or replace the sealing packing Flange end connection bolts Uneven tightening evenly Tighten the flange connection bolts Flange gasket failure Replace the flange gasket Valve switch Card astringently drive lost lubrication To the valve drive plus Note Lubricating oil valve switch failure Defective drive unit Replacement of the drive unit or professional maintenance Spindle valve installation and use 1. Before installation, check the valve model is consistent with the conditions. 2. Rubber, PTFE and other soft seals, to check the valve cavity and sealing surface and other parts of the debris, if necessary, to be cleaned. 3. The user must consider the necessary space reserved for the valve drive before installation. 4. Electric (electro-hydraulic) moving valve factory have been commissioned good, users first use, in order to prevent wiring errors, the first manual open the valve to the semi-open state, and then turn on the power for no-load test drive. 5. Gas (liquid) moving valve air supply must ensure adequate supply of gas (liquid) pressure. 6. During installation, the bolts should be tightened evenly. 7. Installation can not be a strong impact on the valve or any twist valve components. 8. The seal on the valve exposed, to be regularly filled with sealing grease. 9. In a drier area, when the valve drive is a spur gear, lubricate it.