Common leakage problems and solutions in the use of gate valves
Classification:
Release Time：2019-10-15
Gate valve is mainly divided into: manual gate valve, pneumatic gate valve, stainless steel gate valve, forged steel gate valve, American standard gate valve, electric gate valve, gas gate valve, knife gate valve, dark rod gate valve, bright rod gate valve, bellows gate valve and so on. Gate valve as all the switch valve, the development of universal application of the petroleum, chemical, electric power, water conservancy and other industries, is one of the most widely used valves. Therefore, the problems and solutions in the use of gate valves are particularly important. One: the simplest treatment, check whether the gate valve and the gate valve coupling bolt is tightened, if not tightened, the gasket ring and flange sealing groove surface is not fully combined often lead to leakage. The bolts and nuts shall be checked in sequence, and all bolts shall be tightened until the gasket ring is pressed tightly. Secondly, check the size and accuracy of the sealing gasket ring and flange sealing groove surface. If the size of the sealing contact surface is incorrect or too rough, repair or update the sealing gasket ring. Two: the valve cover leakage, is the part of the valve cover and the body bolt connection, mainly in the packing seal leakage. 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. In this case, replace the seal. Again, check whether the sealing surface of each sealing groove is rough or has other defects. If there are defects, eliminate the defects or update the damaged parts. Three: valve leakage, in addition to man-made factors, the valve body in the casting process, sometimes there will be sand holes, sand holes and other casting defects, in the machining process is difficult to be found, once the pressure is applied, hidden casting defects will be exposed. In this case, the valve body shall be repaired, repaired or renewed. Four: valve seat and valve plate between the leakage, this is what we usually call the sealing surface leakage or seal leakage, the leakage of the reason is relatively complex. Generally, it can be divided into two categories: one is the leakage of the sealing surface, and the other is the leakage of the root of the sealing ring. First check the valve seat and valve plate contact sealing surface accuracy, the sealing surface at least to grinding, such as the surface accuracy is too rough, it should be removed to re-grinding. Secondly, check the sealing surface for defects such as pitting, indentation, sand holes, cracks, etc. In this case, replace the valve plate or valve seat. In addition to the defects caused by the processing and casting process of these products, there are also human factors: it is easy to enter the welding inspection, iron filings, impurities and other foreign matters during the installation process, and such sundries should be cleaned before installation. If you forget to clean or clean up is not complete, it will cause the valve plate to close less than the expected depth and produce leakage. In this case, remove the valve body and clean it again. Therefore, for the selection and use of gate valves, we must choose reliable and stable quality. Wuhan Xiete Valve Technology Co., Ltd. quality assurance, welcome new and old customers come to order.
Gate valve is mainly divided into: manual gate valve, pneumatic gate valve, stainless steel gate valve, forged steel gate valve, American standard gate valve, electric gate valve, gas gate valve, knife gate valve, dark rod gate valve, bright rod gate valve, bellows gate valve and so on.
Gate valve as all the switch valve, the development of universal application of the petroleum, chemical, electric power, water conservancy and other industries, is one of the most widely used valves. Therefore, the problems and solutions in the use of gate valves are particularly important.
One: the simplest treatment, check whether the gate valve and the gate valve coupling bolt is tightened, if not tightened, the gasket ring and flange sealing groove surface is not fully combined often lead to leakage. The bolts and nuts shall be checked in sequence, and all bolts shall be tightened until the gasket ring is pressed tightly. Secondly, check the size and accuracy of the sealing gasket ring and flange sealing groove surface. If the size of the sealing contact surface is incorrect or too rough, repair or update the sealing gasket ring.
Two: the valve cover leakage, is the part of the valve cover and the body bolt connection, mainly in the packing seal leakage. 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. In this case, replace the seal. Again, check whether the sealing surface of each sealing groove is rough or has other defects. If there are defects, eliminate the defects or update the damaged parts.
Three: valve leakage, in addition to man-made factors, the valve body in the casting process, sometimes there will be sand holes, sand holes and other casting defects, in the machining process is difficult to be found, once the pressure is applied, hidden casting defects will be exposed. In this case, the valve body shall be repaired, repaired or renewed.
Four: valve seat and valve plate between the leakage, this is what we usually call the sealing surface leakage or seal leakage, the leakage of the reason is relatively complex. Generally, it can be divided into two categories: one is the leakage of the sealing surface, and the other is the leakage of the root of the sealing ring.
First check the valve seat and valve plate contact sealing surface accuracy, the sealing surface at least to grinding, such as the surface accuracy is too rough, it should be removed to re-grinding. Secondly, check the sealing surface for defects such as pitting, indentation, sand holes, cracks, etc. In this case, replace the valve plate or valve seat.
In addition to the defects caused by the processing and casting process of these products, there are also human factors: it is easy to enter the welding inspection, iron filings, impurities and other foreign matters during the installation process, and such sundries should be cleaned before installation. If you forget to clean or clean up is not complete, it will cause the valve plate to close less than the expected depth and produce leakage. In this case, remove the valve body and clean it again.
Therefore, for the selection and use of gate valves, we must choose reliable and stable quality.
Wuhan Xiete Valve Technology Co., Ltd. quality assurance, welcome new and old customers come to order.
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