1. Gate Industrial Valves and gate valve leakage at the first check valve and gate valve connecting bolts are tight, if not tighten, its seal ring and the flange seal groove surface not sufficiently often lead to leakage. Should be in order to check bolt and nut, tighten all bolts, until the pressure tight seal ring. Second check on the surface of the seal ring and the flange seal groove size and accuracy, if the sealing contact surface wrong size or too rough, to repeat or update should be made for the seal ring. Also check the seal ring and the flange seal groove within the contact area is a little bit erosion, sand hole, sand holes, or impurities, such defects, if any, should carry on the corresponding repair welding, repair, or clean up. 2. Bonnet leakage bonnet leakage, this failure phenomenon in packing seal leakage. First inspection seal whether correct, whether to suit the seal groove, if there is such a problem will not to replace the sealing ring or seal groove. Second check seals have burrs, fracturing, the phenomenon such as twist off, this situation is to replace the seals. Again, check whether the sealing groove seal face rough or have other defects, if there is a defect, is to eliminate the defects or update the damaged parts. Bonnet or scaffolds by compression seal packing, should check the installation of the packing case, if you find packing installed upside down, up and down is removed, carried out in accordance with the correct way to install, paying special attention to the packing seal joint surface. Also, check the seal of the contact surface precision whether meet the requirements. 3. body cavity decent leak valve body in the process of casting, can appear sometimes casting defects such as sand holes, sand hole, in the process of machining hard to find, once the pressure casting defects of hidden will be exposed. Appear this kind of situation, carries on the repair welding, the repair or update. 4. seat valve plate leak valve seat valve plate in leakage, the installation or maintenance is the most common phenomenon of gate valves. Generally can be divided into two kinds: one kind is sealing leak, another kind is seal leak root. Should first check the seat and the precision of the sealing contact surface of valve plate, the sealing surface grinding, at least rough surface accuracy is found, it should be removed to grind. Second check the sealing face whether there is pitting, indentation, sand holes, cracks and other defects, in this case, to the valve plate and valve seat for replacement. With compression spring seat, should check the pressure spring elasticity is conform to the requirements, if less resilient, is to update the compression spring. Also check valve plate and valve stem tee coupling place is too loose, the valve plate in pressure in the process of the slope, the situation is to remove the valve plate, adjust it to the best size. Body internal open files, during the installation process is easy to enter the welding check, scrap iron, impurities, such as foreign body, before installation should clean up the clutter. If forget clean or not complete, will cause the valve plate closed the depth of less than expected, resulting in leakage, the situation is to remove the body to clean up. When installing the seat should be installed with special tools for installation, and should check whether the seat installed, if the depth of the thread screw less than expected, the seat will appear leakage phenomenon, the situation would be to use special tools for valve seat for installation. 5. Wheel rotation is not flexible, 1) The main reason. (1) stem bend torsion. (2) the surface accuracy is not enough. (3) conduct operation, make the thread damage. (4) lack of lubricating or lubricant. (5) stem nut tilt. 6 fit tolerance, biting too tight. Cruelly open gate the lack of protection, the stem thread covered in dust sand, or be corroded by rain and dew frost and snow. End of thread is medium corrosion ( Non-rising stem gate valve or gate valve stem nut on the bottom) 。 Pet-name ruby improper selection of materials, such as the stem and stem nut for the same material, easy to bite. ( 2) Preventive measures and solutions. 1) we will strictly control force measure, not hard twist ( Refers to the handwheel and direct connection of valve stem) 。 (2) improve the quality of processing, to meet the specification requirements. (3) careful operation, do not make MengJin closed, don't to the top dead center, open the back after the check point, hand wheel shall be one or two laps, make the thread or upper, lest medium to promote stem upward shocks. (4) check the lubrication condition, maintain the normal lubrication state. 5. Straighten or fixed stem nut. 6 revision or update the stem nut, to the standard specification. All landowners often clean the stem nut dust sand, in case of rust. Today open a gate to add a protection to the valve stem. Pet-name ruby stem nut adopts copper material is better, do not use with the valve stem of the same material.
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