The function of the ball valve under the Y-type filter
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This post was last edited by Looking up at the starry sky oyer on 2019-9-17 07:10. I would like to ask the experts here: what is the purpose of the ball valve located under the Y-shaped filter in the screenshot? Are there any standard requirements that specify the use of ball valves? It is indicated in both PID documents that ball valves should be used; thank you
Is it for backwashing? Zoom in on the image to take a closer look
Similar to the drain valve, are there any special requirements for this drain valve? In the PID, all the other drain valves are gate valves; for this type of Y-filter, it is a ball valve
It should work similar to a drainage function; the screenshot has been replaced and a NOTE has been added for explanation
I’ve seen Y-type filters with three flange connections for the first time; the other types I’ve encountered have openings designed for removing the filter mesh. Is this material particularly hazardous?
It is likely used to drain all the fluid (as the medium may be toxic, corrosive, or hazardous), in order to reduce residual fluid in the pipes during maintenance and replacement. Ball valves are easy to open and close, and they generally do not suffer from mechanical particle jams that can occur with gate valves.
Media: vinyl acetate and hydroquinone
Media: vinyl acetate and hydroquinone
But all the other drain valves on the same pipeline are gate valves; it’s the ball valve that is located below the filter. In the two different PID setups, the valve beneath the filter functions as a drain valve. The medium in one case is vinyl acetate and hydroquinone, while in the other case it’s an additive with a viscosity of 4000 cp. Does this mean that the drain valve beneath the filter can only be a ball valve?
Personal understanding: The function of a filter is to remove mechanical impurities of a certain size; the area near the filter is where such mechanical particles accumulate. A ball valve ensures a tight seal when closed, whereas in the case of a gate valve, solid deposits in the gate groove make it difficult to achieve a tight seal. This is an inference based on speculation, as there is no practical evidence to support it!