The Order of Valve Installation

10/17/2017

When reading NFPA 13 Handbook, 8.16.1.1. The figure shows several layout of valves installation. My question is what is the order to install the valves. Wet system figure shows control valve, then check valve; however the dry pipe system shows check valve first then control valve. So what is the right order to install valves? Or it doesn't matter as long as you have control and check valve?

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1 Comment

Joe

11/2/2017 06:29:19 am

Functionally I don't believe the order will impact the system. It could be useful to have the isolation valve first, then any other devices downstream of the valve in case of maintenance or inspection.

For instance, if for some reason the check valve would need to be replaced it could with only shutdown of that system by the isolation valve you've provided. If the check valve is upstream of the valve, you may have to shut down large portions of the building in order to replace or inspect just that check valve.

Just my thoughts, I'd be interested if anyone else has a take on it.

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