Failure disposal measures of flange gate valve

First check valve and gate valve connection bolts are tightened, if not tightened, the sealing gasket ring and the flange sealing surface is not fully integrated often lead to leakage. The bolts and nuts should be checked in sequence, and all the bolts should be tightened until the seal gasket ring is pressed. Second, should check the gasket ring and flange seal groove face size and accuracy, if the sealing contact surface size is incorrect or too rough, with gasket ring to repair or update. Furthermore, check sealing pad ring and flange seal groove contact if there is pitting, sand hole, trachoma or impurities, such as the existence of such defects, the corresponding repair welding, repair or clean the.

Valve cover leakage, this failure is mainly manifested in the leakage of packing seal. First inspection seals choice is correct, whether with the sealing groove matched with the, if have this kind of problem to seal replacement or repair of sealing groove. Then check the seal or burr, fracturing, broken phenomenon, this situation is to replace the seal. Again, check the sealing surface of the seal is rough or have other defects, if there is a defect, it is to eliminate the defect or update the damaged parts.

By compression packing seal, check the packing should be installed the valve cover or stent, if found on packing mounted upside down, to remove, in accordance with the correct method of re installation, in particular, to, pay more attention to the packing sealing piece is combined with the surface. Furthermore, check the accuracy of the contact surface of the seal to meet the specified requirements.

Body in the casting process, sometimes sand hole, sand hole and other casting defects, in the machining process is difficult to be found, once applied pressure, hidden casting defects will be exposed. This is the case, to repair welding, repair or renewal of the.

Valve seat valve plate leakage, the installation or maintenance of the valve which is the most common phenomenon. Generally can be divided into two categories: one is the sealing surface leakage, and the other is the seal ring root leakage.