There are many functions of valves, which can be said to be an important tool that the pharmaceutical industry cannot replace, which has made a huge contribution to pharmaceutical production. However, with the further development of pharmaceutical production levels, the safety of pharmaceutical machinery is important. Valves are an important part of pharmaceutical machinery, and in some pharmaceutical equipment, some faults are caused by valves. Therefore, if the valve fails, it will have a huge impact on pharmaceutical production.
According to customer experience, the valve equipment companies summarized common valve failures and treatment methods, and put forward suggestions for preventive maintenance of valves for customers.
The valve body leaks. There are two main reasons for leakage of the valve body. First, the valve body has blisters or cracks. Second, the valve body is cracked during repair welding. For this failure, the suspected crack can be polished, etched with a 4% nitric acid solution, and displayed if there is a crack. In addition, it is necessary to excavate the crack.
The bonnet joint surface leaks. Mainly because the bolt tightening force is not enough or tight; the gasket does not meet the requirements or the gasket is damaged; the joint surface is defective. For the bonnet joint surface leakage, the bolts can be tightened or the door flange flanges can be aligned. If the gasket does not meet the requirements or the damage can be replaced, and the joint surface is defective, the sealing surface of the door cover can be disassembled.
The stem and its mating female thread are damaged or the stem tip is bent and the stem is bent. The main cause of this phenomenon is improper operation, excessive force of the switch, failure of the limit device; excessive tightening of the thread; excessive number of operations and long service life. For the first reason, the operation can be improved. It is forbidden to use excessive force, and then the limit device and the over-torque protection device are checked. For the second reason, the components with suitable materials and assembly tolerances can be selected; For three reasons, you can replace the spare parts.
The valve is leaking inside. If the phenomenon of leakage inside the valve is encountered, it is likely that the sealing is not strict; the joint surface is damaged; the gap between the valve core and the valve stem is too large, causing the valve core to sag or the contact is not good; the sealing material is bad or the valve core is stuck. The valve manufacturer stated that it can improve the operation and re-open or close it; it can also re-grind the valve core and seat sealing surface, or adjust the gap between the valve core and the stem or replace the valve flap. It is impossible to replace or weld the seal ring and disintegrate the valve to eliminate the jam.
The valve core and valve seat have cracks. The main reason for this phenomenon is the poor quality of the joint surfacing; the temperature difference between the two sides of the valve is large. It is recommended by the equipment manufacturer that the crack can be repaired except for the heat treatment, and the light is polished and ground.
The valve stem lifts and the flexible switch does not move. Mainly because the cold state is too tight, it is too tight after being heated or fully opened; the packing is too tight; the valve stem gap is too small and swells; the valve stem and the nut are too tightly fitted, or the thread is damaged. ; packing flattening pressure deviation; door rod bending; medium temperature is too high, poor lubrication, valve stem is severely rusted.
In this regard, the equipment expert believes that the operator needs to heat the valve body and then slowly try to open it or close it tightly; then loosen the packing and then open it; properly increase the valve stem clearance; replace the valve stem and wire Mother; re-adjust the packing gland bolt; straighten the door rod or replace it; the door rod uses pure graphite powder as a lubricant.
The filler leaks. The filler material is incorrect; the packing gland is pressed or biased; the method of pretending the packing is incorrect; the surface of the valve stem is damaged. For the problem of packing leakage, the operator needs to select the packing correctly; check and adjust the packing gland to prevent pressure deviation; add packing according to the correct method; modify or replace the valve stem.
Valve failure can be solved, but preventive maintenance of the valve cannot be ignored. In the initial stage of the design, certain problems should be predicted for the valve, and the necessary measures should be taken to solve the common problems. The material is an important factor affecting the quality of the valve. In this process, the corresponding The materials are inspected to ensure compliance with national regulations and standards.
In the process of transportation, the relevant documents must be complete, such as the production of security documents, the ability to determine the documents for production. Secondly, in the soil of transportation, try to avoid the bumping of the valve, be affected by the material of the valve production, and carry out anti-corrosion treatment if necessary. Thirdly, a protective film is uniformly applied on the outside of the valve in advance, which can effectively block the erosion of the valve surface by the external environment, and on the other hand, can promote the safe transportation of the valve to the specified location, thereby achieving effective protection. the goal of.
According to customer experience, the valve equipment companies summarized common valve failures and treatment methods, and put forward suggestions for preventive maintenance of valves for customers.
The valve body leaks. There are two main reasons for leakage of the valve body. First, the valve body has blisters or cracks. Second, the valve body is cracked during repair welding. For this failure, the suspected crack can be polished, etched with a 4% nitric acid solution, and displayed if there is a crack. In addition, it is necessary to excavate the crack.
The bonnet joint surface leaks. Mainly because the bolt tightening force is not enough or tight; the gasket does not meet the requirements or the gasket is damaged; the joint surface is defective. For the bonnet joint surface leakage, the bolts can be tightened or the door flange flanges can be aligned. If the gasket does not meet the requirements or the damage can be replaced, and the joint surface is defective, the sealing surface of the door cover can be disassembled.
The stem and its mating female thread are damaged or the stem tip is bent and the stem is bent. The main cause of this phenomenon is improper operation, excessive force of the switch, failure of the limit device; excessive tightening of the thread; excessive number of operations and long service life. For the first reason, the operation can be improved. It is forbidden to use excessive force, and then the limit device and the over-torque protection device are checked. For the second reason, the components with suitable materials and assembly tolerances can be selected; For three reasons, you can replace the spare parts.
The valve is leaking inside. If the phenomenon of leakage inside the valve is encountered, it is likely that the sealing is not strict; the joint surface is damaged; the gap between the valve core and the valve stem is too large, causing the valve core to sag or the contact is not good; the sealing material is bad or the valve core is stuck. The valve manufacturer stated that it can improve the operation and re-open or close it; it can also re-grind the valve core and seat sealing surface, or adjust the gap between the valve core and the stem or replace the valve flap. It is impossible to replace or weld the seal ring and disintegrate the valve to eliminate the jam.
The valve core and valve seat have cracks. The main reason for this phenomenon is the poor quality of the joint surfacing; the temperature difference between the two sides of the valve is large. It is recommended by the equipment manufacturer that the crack can be repaired except for the heat treatment, and the light is polished and ground.
The valve stem lifts and the flexible switch does not move. Mainly because the cold state is too tight, it is too tight after being heated or fully opened; the packing is too tight; the valve stem gap is too small and swells; the valve stem and the nut are too tightly fitted, or the thread is damaged. ; packing flattening pressure deviation; door rod bending; medium temperature is too high, poor lubrication, valve stem is severely rusted.
In this regard, the equipment expert believes that the operator needs to heat the valve body and then slowly try to open it or close it tightly; then loosen the packing and then open it; properly increase the valve stem clearance; replace the valve stem and wire Mother; re-adjust the packing gland bolt; straighten the door rod or replace it; the door rod uses pure graphite powder as a lubricant.
The filler leaks. The filler material is incorrect; the packing gland is pressed or biased; the method of pretending the packing is incorrect; the surface of the valve stem is damaged. For the problem of packing leakage, the operator needs to select the packing correctly; check and adjust the packing gland to prevent pressure deviation; add packing according to the correct method; modify or replace the valve stem.
Valve failure can be solved, but preventive maintenance of the valve cannot be ignored. In the initial stage of the design, certain problems should be predicted for the valve, and the necessary measures should be taken to solve the common problems. The material is an important factor affecting the quality of the valve. In this process, the corresponding The materials are inspected to ensure compliance with national regulations and standards.
In the process of transportation, the relevant documents must be complete, such as the production of security documents, the ability to determine the documents for production. Secondly, in the soil of transportation, try to avoid the bumping of the valve, be affected by the material of the valve production, and carry out anti-corrosion treatment if necessary. Thirdly, a protective film is uniformly applied on the outside of the valve in advance, which can effectively block the erosion of the valve surface by the external environment, and on the other hand, can promote the safe transportation of the valve to the specified location, thereby achieving effective protection. the goal of.
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