safety valve
safety valve
(OP)
pls tell me what is back pressure? from where it is coming? what is work of it? what are types of back pressure are there?
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RE: safety valve
"The filter has a backpressure of 75 psig", implies that 75 psig, just upstream of the filter, will be sufficient, or the minimum pressure needed, to pass either a certain, or perhaps totally unspecified, flowrate through the filter. If the flowrate is unspecified, the engineer is expected to assume whatever flowrate is required to make the statement true. If handed to you across the counter, it is likely to be without any consideration of the system's outlet pressure at the time when it is installed, or operating. If viewing within a system, or nearly installed in a system, the backpressure value probably already has the system's outlet pressure already added.
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RE: safety valve
there are two types of back pressure:
Superimposed:which is pressure at the outlet of a pressure relief valve when it is required to operate.
Built-up:back pressure which develops in the discharge system after relief valve open.