Differential pressure gauge installation issues
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I’m a complete beginner; I’m not from an instrumentation field. I hope kind people can help answer my questions. Recently I encountered a requirement: a differential pressure gauge needs to be connected to four valves. How should this be installed? I really don’t understand it – doesn’t a differential pressure gauge have only two ports?
There are two root valves and two drain valves; the connection between the root valves, drain valves, and differential pressure transmitter is in the form of a tee. Either use two valves at the root, and two more next to the transmitter; this way there’s no need to go to the pressure tapping point to close the valves, which is more convenient.
Could you send the original request details so that I can understand its purpose? For some critical process streams that cannot be stopped under normal operating conditions, two shut-off valves are used in series, so that if one valve fails to close properly, the second valve can be used to shut it off.
Correct answer, agree……:D
It’s possible that you are under high pressure and need secondary door protection.
It would be better to have pictures; it’s hard to answer like this.....
I think it’s either the fear that it won’t seal properly – with two valves – or it’s a vent valve
What you’re referring to isn’t called a root valve; and if we go by what you say, shouldn’t there also be a balance valve?