Analysis and Preparedness Measures of Common Faults in the Application of Gate Valve
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Release Time：2017-06-23
Problem 1: Leakage at the connection between the gate valve and the gate valve First check whether the bolts at the connection between the gate valve and the gate valve are tightened. If they are not tightened, the internal gasket ring and the flange sealing groove surface are not perfectly combined, resulting in leakage. The bolts and nuts shall be checked in sequence and all bolts shall be tightened until the gasket ring is pressed. Secondly, check the size and accuracy of the sealing gasket ring and flange sealing groove surface. If the sealing contact surface is incorrect or too rough, repair or replace the sealing gasket ring. Or check whether there are sand holes or impurities in the contact surface of the sealing gasket ring and the flange sealing groove. If there are these defects, they should be repaired accordingly,
Problem 1: leakage at the connection between the gate valve and the gate valve
First to checkGate valveWhether the bolt at the connection with the gate valve is tightened. If it is not tightened, the internal sealing gasket ring and flange sealing groove surface are not perfectly combined, resulting in leakage. The bolts and nuts shall be checked in sequence and all bolts shall be tightened until the gasket ring is pressed. Secondly, check the size and accuracy of the sealing gasket ring and flange sealing groove surface. If the sealing contact surface is incorrect or too rough, repair or replace the sealing gasket ring. Or check whether there are sand holes or impurities in the contact surface of the sealing gasket ring and the flange sealing groove. If there are these defects, they should be repaired, repaired or cleaned accordingly.
Problem two: valve cover leakage
Valve cover leakage, this phenomenon is mainly manifested in the leakage of packing seals. First check whether the seal is selected correctly and whether it matches the sealing groove. If there is such a problem, replace the sealing ring or repair the sealing groove. Secondly, check whether the seal has burrs, fracturing, twisting and other phenomena. If this happens, replace the seal in time. Then check whether the sealing surface of each sealing groove is rough or has other defects. If there are defects, repair the defects or replace the damaged parts.
Problem 3. valve body cavity surface leakage
In the casting process of the valve body, casting defects such as sand holes and sand holes sometimes appear, which are generally difficult to find. Once pressure is applied to it, casting defects will appear. When this occurs, it should be repaired, repaired or renewed.
Problem 4. Seat Valve Plate Leakage
Seat valve plate leakage, in the installation or maintenance of the gate valve process is the most common phenomenon. Generally, it can be divided into two types: one is the leakage of the sealing surface and the other is the leakage of the root of the sealing ring.
First of all, check the accuracy of the sealing surface of the valve seat and the valve plate. The sealing surface should be ground at least. If the surface accuracy is too rough, it should be removed and ground again. Secondly, check the sealing surface for the presence of pitting, indentation, sand holes, cracks and other defects, such a situation, the valve plate or valve seat to be replaced. For the valve seat with pressure spring, the elasticity of the pressure spring should be checked to meet the requirements. If the elasticity is weakened, the pressure spring should be replaced. Furthermore, check the valve plate and stem T-shaped connection whether there is a loose phenomenon, resulting in the valve plate in the process of compression of the slope of the situation, the emergence of such a situation to remove the valve plate, its adjustment to the best size.
Problem 5. handwheel rotation is not sensitive
(1) The main reasons are: bending of the valve stem, insufficient surface accuracy, excessive operation, thread damage, lack of lubrication, tilt of the valve stem nut, inaccurate fitting tolerance, over-tightening, lack of protection of the open gate valve (the valve stem thread is covered with dust and sand or rusted by wind and rain), thread corrosion, improper material selection, etc.
(2) Preventive measures and solutions:Wuhan Xiete Valve Technology Co., Ltd.In the process of operation, strictly control the force, improve the quality of product processing, meet the requirements of national standards, and operate carefully. And often check the lubrication, maintain the normal lubrication state. Correct or update the stem nut in time to meet the national standard specification. Professional technical engineers regularly clean the stem nut dust sand to prevent corrosion and rust. And to strengthen the protection of open-air gate valve, our company in the selection of high-quality high-demand materials.
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