Brief introduction of rubber-lined valve
Main lining materials of rubber-lined valves [butyl rubber, natural rubber, EPDM, chloroprene rubber, nitrile rubber, fluororubber, silicone rubber, hard rubber and soft rubber]; Suitable media for rubber lining: hydrocyanic acid, 50% fluosilicic acid, hydrochloric acid, 30% sulfuric acid, 50% hydrofluoric acid, 85% phosphoric acid, alkali, salts, metal plating solution, sodium hydroxide, potassium hydroxide, neutral salt solution, 10, except strong oxidants (such as nitric acid, chromic acid, concentrated sulfuric acid and hydrogen peroxide).
Use of rubber-lined valves
With the rapid development of modern industry, rubber-lined valves and their various pipeline accessories have been rapidly applied in petroleum, printing and dyeing, chemical industry and other fields, showing strong vitality. As the first choice in engineering, rubber-lined valve has attracted great attention and favor from engineering design units and construction units, and it is a sunrise product with great market potential.
The rubber-lined valve has dual functions of switch and flow regulation, which can easily open and close the gas path without affecting the flow, ensuring the repeatability of the flow. The slow start reduces the influence of instantaneous pipeline pressure on the instrument. It is equivalent to adding a damper, which greatly prolongs the service life of the needle valve. Rubber-lined valves are specially used to control corrosive or strong corrosive media. The surface of the inner cavity of the valve body is covered with all kinds of rubber, which is suitable for different working temperatures and fluid pipelines and has the characteristics of high strength and good corrosion resistance.
Rubber lined valve manufacturer
Ned Rubber Hose Valve Industry Co., Ltd. is a rubber-lined valve manufacturer that I personally promoted. Mainly because they have too many partners, which shocked me, because the companies they cooperate with are all large well-known manufacturers, which add up to more than 1000 cooperative enterprises, such as Zijin Mining, Baiyin Nonferrous Group, Jiangxi Copper, Shougang Jingtang Iron and Steel, Hebei Iron and Steel Mining and so on. In addition, their company is also one of the famous R&D professional manufacturers of rubber hose valve series, rubber lined valve pipeline series and new special rubber in China. It is these big data of their company that attracted me deeply.
This second Wuhu Hongda Rubber Valve Manufacturing Co., Ltd. is slightly inferior, but their main products are still many kinds. At present, the main products they produce are: hydraulic cyclone, rubber-lined stop valve, rubber-lined check valve, wear-resistant pipeline, flexible rubber joint, ceramic metal workpiece products and so on, and the varieties are still admirable.
Installation of rubber-lined valve
1. During installation, check valve marks (such as valve model, nominal diameter, pressure grade, material, etc.). ) meet the use requirements, whether the flow direction sign on the shell is consistent with the flow direction of the pipeline.
2. When installing, try to install horizontally so that the valve stem faces upwards. In order to prevent the valve from being skewed, the valve can be installed in a natural state to prevent the valve from generating greater installation stress due to pipelines and supports. During installation and lifting, the handwheel shall not be used to lift the valve.
3. When installing, if the sealing surface of the pipeline flange connected with the rubber lining sealing surfaces at both ends of the valve is metal, a sealing gasket should be added. The sealing surface of the flange connected with it should follow the structure of Figure A, not the structure of Figure B, otherwise the sealing surface of the valve will be damaged and leak prematurely.
4. If the pipeline is strong enough to bear the weight and operating torque of the valve, there is no need to support the valve, otherwise the rubber-lined valve should be provided with special support points.
5. After installation, during the system or pipeline pressure test, the valve should be in the full open position.
Attention must be paid to the use of rubber-lined valves.
1. Please read the product manual carefully before use.
2. According to the pressure, temperature and medium usage specified on the nameplate or instruction.
3. When in use, prevent the rubber-lined valve from generating excessive pipeline stress due to temperature change, minimize temperature change, and add U-shaped expansion joints before and after the valve.
4. It is forbidden to use lever to open and close the rubber-lined valve. Pay attention to the indicated position and limit device of rubber lining valve. After opening and closing in place, do not forcibly close it to avoid premature damage to the rubber sealing surface.
5. For some unstable and easily decomposed media (for example, the decomposition of some media will cause volume expansion and abnormal increase of working pressure), thus causing valve damage or leakage, measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. When selecting valves, it is necessary to consider the possible changes of working conditions caused by unstable and easily decomposed media, and choose rubber-lined valves with automatic pressure relief devices.
6. For rubber-lined valves on pipelines with toxic, flammable, explosive and corrosive media, it is forbidden to replace the packing under pressure. Although the rubber-lined valve has the function of upper seal in design, it is not recommended to replace the packing under pressure.
7. For pipelines with spontaneous combustion medium, measures should be taken to ensure that the ambient temperature and working temperature do not exceed the spontaneous combustion point of the medium, so as to prevent the danger caused by sunlight or external fire sources.
8. For the severe and long-term vibration of the pipeline, measures should be taken to eliminate it, so as not to damage the rubber lining valve.
9. In the process of using rubber-lined valves, the rubber sealing surface is often damaged by medium crystallization and solid particles because of its soft texture, resulting in seal leakage. Repair or replace the seal in time after discovery.
10. Some rubber-lined valves are partially opened in use to adjust the flow rate, and the sealing surface is damaged prematurely due to the high speed of the medium. In this case, the seal should be replaced in time.
1 1. There is generally no gasket at the flange of rubber-lined valve. If the middle flange leaks, tighten the middle hexagon nut with flange evenly to eliminate the leakage. If the sealing surface of the middle flange is damaged, the sealing surface needs to be repaired and the middle flange gasket should be added to solve the problem.
12. If the handle or handwheel cannot rotate flexibly or the rubber lining valve cannot be opened and closed, loosen the compression nut appropriately. Rotation is still inflexible. It may be that the gland is skewed, so the gland should be adjusted. After adjusting and unscrewing the gland, the valve cannot be opened and closed flexibly, so it should be disassembled for inspection, dirt removal and troubleshooting. When disassembling this rubber-lined valve, pay attention to what medium is in the pipeline of the rubber-lined valve, whether it is old or newly installed. If the medium used is toxic, flammable and explosive, the staff should wear protective masks and rubber gloves, and wear protective clothing to operate according to the operating procedures. Avoid accidents during disassembly and put an end to accidents.