Views: 0 Author: Site Editor Publish Time: 2021-11-18 Origin: Site
PTFE lined butterfly valves are commonly used as a shutoff valve and flow control valves. As a shutoff valve, PTFE lined butterfly valve is to block the passage of fluid in its closed position and prevent any sort of leakages. Not only should PTFE lined butterfly valve efficiently seal the pipe and the flange to prevent internal leakages within the piping system, but also eliminate fugitive leakages escape from the valve to the atmosphere.
What are the components of PTFE lined butterfly valve?
How does PTFE lined butterfly valve work?
What should be paid attention to when using PTFE lined butterfly valve?
PTFE lined type butterfly valves use bolt length, which is equal to standard bolt length plus nut length plus butterfly valve thickness plus spring pad thickness plus flat pad thickness and a little margin. Generally, the bolt length is calculated according to the matching flange. The bolt hole of the PTFE lined butterfly valve is matched with the thread and is installed by a full-threaded stud bolt. One of the nuts is removed, the bolt is twisted into the bolt hole of the PTFE lined butterfly valve, and then the nut is tightened.
There are two holes on the PTFE lined butterfly valve. There are also through holes and internal threads. If it is a through hole, the bolt will grow long and pass through. The function of PTFE lined butterfly valve is to position the valve pipe coaxially when it is installed. Simply put, it is convenient to install with these holes. The PTFE lined butterfly valve is tightened by bolting the two flanges together to produce a clamping force. The caveat here is that a flange has eight holes but the valve does not have to have eight holes. Generally speaking, there are four holes and two holes. Internal threads, short bolts, installed on both sides of the valve.
The PTFE lined butterfly valve operates based on the quick shut off principle. The circular disc (butterfly) of the PTFE lined butterfly valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the PTFE lined butterfly valve. Using the handwheel, the metal disc is rotated to keep the disc parallel or perpendicular to the flow and it allows or closes the flow. So, the operating principle of the PTFE lined butterfly valves is fairly simple.
The PTFE lined butterfly valve is one of the few industrial valves that are both efficient in isolating and regulating the flow of media. The PTFE lined butterfly valve is also quick to open. The disc is attached to the stem, either through the former or the stem is at the back of the disc. The stem is attached to the handle that is either placed on top of the body or at its side.
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.
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.
The medium conditions used in PTFE lined butterfly valves should not contain hard particles, crystals, or impurities so as to prevent the valve core, the layer of the valve seat from being worn out during the opening and closing of the PTFE lined butterfly valve.
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