Our client of current project requires single block and bleed ball valve.I am familiar with double block and bleed ball valve that has two levers and balls with bleed.But, I am not familiar with single block and bleed ball valve.Can anyone tell me about single block and bleed ball valve?Your Client may be requesting the use of a single Gate valve with a "split" wedge and the tap at the bottom canter of valve body drilled out and fitted with a bleed valve.This was done on one of my projects long ago. I think it was a Crane valve.Why are you asking here? All we can do is guess (my guess is that they mean OSHA Double-Block-and-bleed capability all in one valve body, but I'm just guessing too). Call you client and tell them that their terminology is foreign to you and ask if they have a picture, web-site reference, manufacturer, or any other information. If you assume that one of us has guessed right, then you could be in real trouble if you spec something like a split wedge gate valve when they really wanted a trunnion ball valve or a DBB valve with two handles. When the valve is closed - air to the tool or hose is vented so that it can be disconnected or worked on safely. One application of the upstream vent version is as a steam trap test valve. When valve is closed, upstream steam/condensate is vented and observed.In the plumbing industry, they're referred to as "Stop and Waste" valves.I suggest getting a written description of the required valve function from your client.

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