In order to help users correctly install the use and maintenance of PFA fluorine plastic lining chlor alkali special valve must pay attention to the following points:

1.PFA fluoroplastic lined valve storage

1) When storing PFA fluoroplastic lined valves, it is best to place them in a dry room to avoid open sun and rain, avoid stacking near heat sources, and prevent PFA fluoroplastic from aging and deformation. The sealing surface of PFA fluoroplastic flange at both ends shall be provided with protective cover, and the sealing surface shall not be scratched. When stacking, the sealing surface of the flange at both ends shall be prevented from being compressed.

2) The valves stored and kept shall have records, including the valve name, model, specification, number, quantity, storage date, etc.

2. Installation of PFA fluoroplastic lined valve

1) When installing, pay attention to check whether the valve marks (such as valve type, nominal diameter, pressure grade, material, etc.) are consistent with the use requirements, and whether the flow direction mark on the shell is consistent with the pipeline flow direction.

2) When installing, try to install horizontally so that the valve stem faces upward. To prevent the valve from being skewed so that the valve is installed in a natural state, and to prevent the valve from generating large installation stress due to pipelines, supports, etc. The handwheel shall not be used for valve lifting during installation and lifting.

3) When installing, if the pipe flange sealing surface connected with the sealing surface of PFA fluoroplastic lining at both ends of the valve is metal, PFA fluoroplastic sealing gasket shall be added.

4) If the pipeline has sufficient strength to bear the weight and operating torque of the valve, the valve can not be supported, otherwise, the PFA fluorine plastic lining valve should be set up a special support point.

5) After installation, the valve shall be in the fully open position during pressure test of the system or pipeline.

3. Use of PFA fluoroplastic lined valve

PFA fluorine plastic lining valve price is higher, the working environment is bad, not toxic and harmful chemicals, is very corrosive all kinds of acid and alkali or organic solvent, improper use will produce significant economic losses and serious consequences. Proper use and maintenance of the valve can extend the service life of the valve, put an end to all kinds of accidents, to ensure the normal operation of the pipeline. Therefore, the use must pay attention to the following points:

1) Before use, carefully read the product instructions.

2) Use according to the pressure, temperature and medium specified on the nameplate or instructions.

3) When in use, prevent the valve from causing excessive pipeline stress due to temperature changes, minimize temperature changes, and increase the U-shaped expansion joint before and after the valve.

4) It is forbidden to use the lever to open and close the valve. Pay attention to the indicating position and limit device of the valve opening and closing. After the opening and closing are in place, do not forcibly close the valve to avoid premature damage to the PFA fluoroplastic sealing surface.

5) For some media are unstable and easy to decompose (such as the decomposition of some media will cause volume expansion and abnormal pressure rise) will cause valve damage or leakage, measures should be taken to eliminate or limit the factors that cause unstable media decomposition. In the valve selection, should consider the medium is not stable and easy decomposition may cause changes in working conditions and choose a valve can automatically pressure relief device.

6) For valves on toxic, flammable, explosive and strong corrosive medium pipelines, it is strictly forbidden to replace the packing under pressure. Although the valve is designed with an upper sealing function, it is not recommended to replace the packing under pressure.

7) For pipelines with spontaneous combustion medium, measures shall be taken to ensure that the ambient temperature and working temperature shall not exceed the spontaneous ignition point of the medium, so as to prevent the danger caused by sunlight or external fire.

8) For the severe and long-term vibration of the pipeline, measures should be taken to eliminate it, so as to avoid the damage of the PFA fluorine plastic lining valve.

9) During the use of the valve, the PFA fluoroplastic sealing surface is soft, and often the sealing surface is damaged by medium crystallization and solid particles, resulting in seal leakage. After discovery, the seal is repaired or replaced in time.

10) Some valves are opened in the middle of the valve to adjust the flow rate. High-speed medium causes premature damage to the sealing surface. In this case, the seal should be replaced in time. Generally speaking, PFA fluoroplastic lined valves are not suitable for adjusting valves, but special orders can be made and handled by the manufacturer.

11)PFA fluorine plastic lining valve flange generally without gasket. If there is leakage at the middle flange, tighten the middle flange nuts evenly to eliminate the leakage. If the middle flange sealing surface is damaged, repair the sealing surface and add the middle flange gasket to solve it.

12) If the handle or handwheel rotation is not flexible or can not open and close the valve, can be appropriate to loosen the gland nut. The rotation is still not flexible. May be the gland skew, to adjust the gland. After adjusting and unscrewing the gland, the valve cannot be opened and closed flexibly. It should be disassembled for inspection, dirt removal and troubleshooting. When disassembling such valves, pay attention to what medium is in the valve pipeline, whether it is used or newly installed. Such as the use of media is toxic, flammable, explosive substances,PFA GranulesProcessing personnel should wear protective masks and rubber gloves, wear protective clothing in accordance with the operating procedures. Avoid accidents during disassembly and prevent accidents.

This article comes from:www.tflpfa.com

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