Valve brand transformation and upgrading valve leakage cause analysis and solutions?

Valve brand transformation and upgrading valve leakage cause analysis and solutions?

Valve brand transformation:
In recent years, the domestic chemical machinery industry has been developing more and more rapidly, and the valve industry has become an important part of the valve industry, the valve also has a huge growth space, among which Lecco Valve Co., Ltd. is through transformation and upgrading to obtain greater development.
But, as well as the whole China’s machinery industry, due to the rapid development of the valve, exposes many inevitable reasons, although many companies are facing a very serious test, but the opportunities and challenges, achievements with hidden dangers, chaotic hero, can you give us the market turmoil, is every company wants to achieve, therefore, Lecco Valve believes that the good quality of the ruler, to achieve industrial diversification transformation and upgrading, in order to stand out, become a real safe and reliable valve industry.
Valve brand upgrade:
Until today, China’s valve industry part of the company leaders have perceive the market changes, positive innovation change the products structure, independent research and development of science and technology and development to create new valve, in order to follow the crowd, each company now avatar, the impossible become possible actively seeking breakthroughs, walked out of a road to success, while Taiwan minister valve again innovation advantage in the changing market, Some breakthrough results have been achieved. It has not only won the recognition of domestic and foreign markets, but also got rid of the quagmire of “price war” vicious competition since the beginning. Even under the background of bubble economic depression, Taichen valve still maintained a trend of sustained and stable growth.
My company main sales ball valve, butterfly valve, regulating valve. Among them, the control valve has been the top priority, help research and development of electronic control valve, so that the control valve can be more efficient, more convenient, more compact and more flexible use, so that the majority of customers to buy at ease, with peace of mind.
At present, the valve companies like bamboo shoots after a spring rain to rely on forest, made a positive contribution to the national manufacturing industry, its contribution to China’s GDP economy is obvious to all. However, if you want to survive the fittest and develop and survive in this severe environment, the valve production companies need to recognize their shortcomings and problems, and develop independent products, perfect products.
What are the reasons for valve leakage analysis and solutions?
What happens when a valve in service leaks? What is the main reason? To solve this problem, I would like to make the following summary for you:
1. The closing part falls off and leaks
The reason:
1, poor operation, so that the closing piece is stuck or more than the dead point, the connection is damaged and broken;
2, close the connection is not firm, loose and fall off;
3, the choice of connection material is not right, can not stand the corrosion of the medium and mechanical wear.
Maintenance Methods:
1, correct operation, close the valve can not force too much, open the valve can not exceed the dead point, the valve is fully opened, the handwheel should reverse a little;
2. The connection between the closing part and the valve stem should be firm, and the thread connection should have a backstop part;
3. Fasteners used for connecting the closing parts and the valve stem should withstand the corrosion of the medium, and have certain mechanical strength and wear resistance.
Two, packing leakage (leakage of the valve, packing accounted for the maximum proportion)
The reason:
1. Filler selection is wrong, not resistant to medium corrosion, not resistant to high pressure or vacuum valve, high temperature or low temperature use; 2. Packing installation is wrong, there are small instead of large, screw coil joint is poor, tight and loose, and other defects;
3. The packing has aged and lost elasticity beyond the service life
4. Stem accuracy is not high, bending, corrosion, wear and other defects
5. The number of packing turns is insufficient, and the gland is not pressed tightly;
6. Gland, bolts, and other parts are damaged, so that the gland can not be pressed tightly;
7. Improper operation, excessive force, etc.;
8. The gland is skewed, the gap between gland and stem is too small or too large, resulting in stem wear and packing damage.
Maintenance Methods:
1. The material and type of packing should be selected according to the working conditions;
2. According to the relevant provisions of the correct installation packing, the pan root should be placed and pressed round by turn, the joint should be 30¡æ or 45¡æ; 3. Fillers with long service life, aging and damage should be replaced in time;
4. The stem should be straightened and repaired after bending and wear, and the seriously damaged should be replaced in time;
5. The packing should be installed according to the prescribed number of turns, the gland should be tightened symmetrically and evenly, and the pressure sleeve should have a pretightening gap of more than 5mm;
6. The damaged gland, bolts and other parts should be repaired or replaced in time;
7. Should comply with the operating rules, except the impact type handwheel, with uniform speed normal force operation;
8. The gland bolt should be tightened evenly and symmetrically. If the gap between gland and valve stem is too small, the gap should be appropriately increased; If the gap between gland and stem is too large, it should be replaced.
Three. Leakage of sealing surface
The reason:
1, sealing surface grinding uneven, can not form a close line;
2, the connection between the stem and the closing part at the center of the suspension, is not straight or wear;
3, the valve stem bending or assembly is not correct, so that the closing part is skewed or not in the middle;
4. Improper selection of sealing surface material quality or not selection of valve according to working conditions
Maintenance Methods:
1. Correctly select the material and type of bouncing gasket according to the working conditions;
2, careful adjustment, smooth operation;
3, should be evenly and symmetrically screw the bolt, if necessary, should use torque wrench, preload should meet the requirements, not too large or small. Flange and thread joints should have a certain preload clearance;
4, the gasket assembly should meet the center, the force is uniform, gasket is not allowed to lap and use double gasket;
5, static sealing surface corrosion, damage processing, processing quality is not high, should be repaired, grinding, coloring inspection, make the static sealing surface meet the relevant requirements;
6. When installing the gasket, attention should be paid to cleaning, sealing surface should be kerosene clear, and the gasket should not fall to the ground.
Four, sealing ring connection leakage
The reason:
1, sealing ring rolling is not strict
2, sealing ring and body welding, surfacing quality is poor;
3, sealing ring connection thread, screw, pressure ring loose;
4. The sealing ring is connected and corroded.
Maintenance Methods:
1. The leakage in the sealed rolling place should be fixed by injecting adhesive and then rolling;
2. The sealing ring should be repaired according to the welding specification. When the surfacing cannot be repaired, the original surfacing and processing should be carried out;
3. Remove the screws, clean the pressure ring, replace the damaged parts, grind the sealing and connecting seat close surface, and assemble again. The parts with large corrosion damage can be repaired by welding, bonding and other methods;
4. The sealing ring connection surface is corroded, which can be repaired by grinding and bonding, and the sealing ring should be replaced when it cannot be repaired.
Five, the valve body and valve cover leakage:
The reason:
1. Casting quality of cast iron is not high, and there are trachoma, loose organization, slag inclusion and other defects on the valve body and valve cover body
2. Freezing crack;
3. Poor welding, slag inclusion, unwelded, stress cracks and other defects;
4. Cast iron valve damaged by heavy object impact.
Maintenance Methods:
1. Improve casting quality and conduct strength test in strict accordance with regulations before installation;
2. Heat preservation or heat mixing shall be carried out for valves whose air temperature is 0 or below. Water shall be removed for valves that are not in use. The welding seam of the body and valve cover composed by welding shall be carried out according to the relevant welding operation rules, and the flaw detection and strength test shall be carried out after welding;
4. It is forbidden to push and put heavy objects on the valve. It is not allowed to hit the cast iron and non-metal valve with a hammer.