Views: 0 Author: Site Editor Publish Time: 2021-11-01 Origin: Site
Pipeline medium are becoming much more complex in modern anti-corrosion pipeline. As such, valve requirements are getting complicated as well. Among all the anti-corrosive valves especially the traditional valves with special material like inconel alloy valves, the PTFE butterfly valves and PFA butterfly valves are the most popular and more advantageous.
What is the detailed information about PTFE lined butterfly valve?
What are the advantages of PTFE lined butterfly valve?
What are the disadvantages of PTFE lined butterfly valve?
The temperature of the medium used by the PTFE lined butterfly valve cannot exceed 150°C. The medium temperature used by PTFE lined butterfly valve can reach 150°C in a short time, and the temperature should be controlled within 120°C for a long time. Otherwise, the PTFE lined butterfly valve is easy to soften and deform, which will cause the PTFE lined butterfly valve to close undeadly and cause a large amount of leakage. If the temperature of the medium used is below 180℃ for a short time and below 150℃ for a long time, another fluoroplastic PFA can be used.
Do not have negative pressure. The PTFE lined butterfly valve should avoid using negative pressure in the pipeline. If there is negative pressure, the layer in the inner cavity of the PTFE lined butterfly valve will be sucked out, bulged and shelled, which will cause the valve to open and close to malfunction.
The pressure difference should be controlled within the allowable range, especially PTFE lined butterfly valve and stop valve sealed by bellows. Because the bellows is made of PTFE material. If the pressure difference is large, it is easy to cause the bellows to rupture.
PTFE lined butterfly valve is small in size and light in weight. In comparison with traditional ball valves and gate valves, butterfly valves save at least 70% of space and weight.
PTFE lined butterfly valve is easy to install and maintain. PTFE lined butterfly valve can be mounted wherever needed.
PTFE lined butterfly valve has simple and compact construction, which can on-off quickly at 90 degrees.
Compared to ball valve and gate valve, PTFE lined butterfly valve is great energy saver with lesser torque operations.
PTFE lined butterfly valve has stable anti-corrosion performance because of bubble-tight sealing resulting to no leakage under the pressure testing.
PTFE lined butterfly valve has wide selection of material, such as DI, carbon steel, stainless steel, super duplex, or alloy material. All are applicable to various mediums.
PTFE lined butterfly valve has long service life, up to 3 times the longevity of traditional valve.
PTFE lined butterfly valve is easy to replace the whole unit including valve component. No failure even with multiple on/off operations.
However, there are a few disadvantages associated with PTFE lined butterfly valves. One of the biggest is that by their nature, the disk is always in the flow path unlike ball valves, which have no obstruction to flow in the open position. There is, therefore, a possibility that cavitation and choke can occur, and that the movement of the disk may be impacted by flow turbulence.
A certain part of the disc of PTFE lined butterfly valve always faces the flow, even when completely opened. The operation of a PTFE lined butterfly valve thus always leads to a pressure switch over the valve irrespective of the setting.
PTFE lined butterfly valve has a poor sealing function.
Throttling by employing PTFE lined butterfly valves is restricted to low-pressure drop systems.
Possible cavitation and choked flow are be concerned when PTFE lined butterfly valves perform.
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