Which type of reducer to be designed downstream of a relief valve?
Which type of reducer to be designed downstream of a relief valve?
(OP)
I would like to know, which type of reducer (Concentric or eccentric) to be designed downstream of a TZV / PZV (relief valves).
If concentric be in place for above query, in which position shall it be designed - vertical or horizontal?
Could someone help with any reference, rather than thumb rules?
If concentric be in place for above query, in which position shall it be designed - vertical or horizontal?
Could someone help with any reference, rather than thumb rules?





RE: Which type of reducer to be designed downstream of a relief valve?
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Which type of reducer to be designed downstream of a relief valve?
As above, you do not want the outlet of any RV to be restricting flow.
RE: Which type of reducer to be designed downstream of a relief valve?
I've normally seen concentric reducers used on PSVs. I wouldn't have a problem with an eccentric if it made sense to use one, I'd orientate it such that I couldn't create a liquid pocket. Which orientation makes sense for your application depends on the piping isometric.
RE: Which type of reducer to be designed downstream of a relief valve?
More precisely, my relief vale is a TZV (Temperature) It has an inlet of 1" and outlet also as 1" but I need to connect outlet 1" to a 3/4" flange in Tank Nozzle.
So I need a reducer downstream / outlet of TZV 1" X 3/4".
If I use Concentric Type, what is the problem? I dont think any pocket formation will happen, as TZV outlet will not regularly operate, but only in worse case if there is any temperature raise.
Please have your say dudes!
RE: Which type of reducer to be designed downstream of a relief valve?
You may need to check the backpressure created by the smaller line size and if it is greter than 10% of the set pressre your will need to size the valve differently.
RE: Which type of reducer to be designed downstream of a relief valve?
RE: Which type of reducer to be designed downstream of a relief valve?
What sort of required flow are you talking about? If I have to relieve a flow that is a significant capacity of the PSV, I wouldn't do it regardless of the outlet pressure drop and resulting backpressure calculations. If I'm looking at a typical thermal relief where my required relieving capacity is 0.002 gpm and the PSV capacity is 50 gpm, I'd be more likely to consider it versus insisting the 3/4" tank connection had to be replaced.
Expect a LOT of people to be coming to you pointing out the mistake.