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@ vpl: I will try to. As I'm new to the field its quite hard to get in depth details to the manufacturers.

Oh Oh Oh.. Thats a huge data. And thanks for clarifying that it doesn't involve in surge. But in my project where I'm dealing with pumping system, We are having an air vessel with an air releae valve in a pump room. This pump room is at underground floor level. I doubt about its operation. My...

So. Basically its operation is during when the line is filled or when it is drained. Does it have any role in handling surge? Also Where can it be located? To a highest point in system or anywhere?

All, I understand how an fire extinguishing sytem operates. But What I don't understand is while manufacturing, how the extinguishing agent be filled inside? The mechanicsm which are available in net is quite confusing and complex.. Please help

All, I'm new to this valve engineering. Although I've asking to my seniors and reading many materials, I'm yet unclear about the operation of air release valve. Hope my friends will help me out. Whats it principle behind its operation?

Ya. Got the point. Anyway I'm getting information for every post.

Hey gerhardl: Thanks for the additional info. As you know, we are talking about the fire-fighting system with working pressure maximum of 88 Metre water of column (8.8 bar). However if at all my system undergo such high pressure, I will consider your point surely. Thanks

@hydtools: Offcourse I know what an NRV is @stanier: fine. Let me see. But I doubt whether it will answer all of my questions

All, How does a NRV function? How do we measure accuracy? What will be its estimated loss? Under what pressure difference it operates? Does it hold the water hammer thrust? Please throw some light in it

@BCD: Assuming an 150 NB pipe with 1 mm offset, operating at 8.8 bar pressure, approximately it is exerting 13.2 Kg (130 Newton) of force. Will it sustain?

That really helps a lot. Thank u!!

Gotcha!!! Now I understand. Earlier I thought the longer offset section is open outward to make the fluid flow upstream. But now we need to set the valve in such a way that we need to open against the pressure.. Right?

Thanks for putting some lighting on the subject. Now apart from safety part of view, maintenance is another point to be considered. How sluice valve can be maintained in-situ and why can't butterfly valve?

All, Can you please explain, how in fire piping system, butterfly valve and sluice valve differs functionally? To my knowledge, both are functionally same. But some of my colleagues are saying, sluice valve are much safer than butterfly valve. Also in sluice valve we have less friction loss. For...

Hi HSBCN! After reading those entire thread articles only I got this doubt.Pl clarify

thread408-126483 When the valves are doubly/triply offset, I understand that the pivot and stem is offset from the centre of pipeline. In such cases, the highly pressurized fluid at one side causing unbalanced force. Wont this make the valve to open? If not, Why?