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Author Topic: You've all seen these 'H' for Fire Hydrant signs, but what are these ones with  (Read 35044 times)

Offline P-Kasso2

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SV is SLUICE VALVE so called because of the type of closure in the valve itself. It is not a safety valve, it is a standard filtting on water mains and gas mains.

The reason for the numbers on the plate is so the operator has a guide to the number of turns the valve will have before being fully open or closed. The second number is the distance away from the marker post (usually in feet!) at 90 degrees to the plate. Handy if the road has been resurfaced and the valve covered. Valves are used to islolate mains in case of bursts or new services, etc.

I'm a water engineer... I believe that Gas companies use the same terminology and marking on their apparatus :)

Thank you Dave. I didn't realise things were so complex! I didn't realise either that this question would still be going over two years after I first asked it. Maybe now we can hear from any gas engineers out there about what number and letter systems they use? Thanks again, I've enjoyed this thread no end.
"I live in hope"

Gb

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SV is stop valve  in British Standard BS 750:2006 and section WO 03-S3 covers " SURFACE BOXES FOR UNDERGROUND STOP VALVES" which clearly shows that SV markings mean stop valve (ie a tap to turn off a water main)

I am unsure why people think it means sluice valve.

Offline P-Kasso2

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SV is stop valve  in British Standard BS 750:2006 and section WO 03-S3 covers " SURFACE BOXES FOR UNDERGROUND STOP VALVES" which clearly shows that SV markings mean stop valve (ie a tap to turn off a water main)

I am unsure why people think it means sluice valve.


I think you've nailed it in one, Gb! I mean...Who can argue with British Standard BS 750:2006 and section WO 03-S3 covers? Not me.

So that's one mystery cleared up...leaving us with just one other mystery and that is why are you still a guest Gb? Become a member...it's free, no strings attached...and it's fun. 
"I live in hope"

Paul

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Sounds like the answer is "sluice valve"! See section 4.2.2 of the Fire Service Manual: Volume 1 Fire Safety Technology, Equipment and Media: Hydraulics, Pumps and Water Supplies, on the UKFRS dot com website. It also states "the term 'stop valve' is normally used for valves in domestic premises".