Plumbing – What kind of valves are these

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I have two of these valves, one before and the other after my water meter in my home. This is a building with multiple apartments in New York City (not sure if it helps).

I would like to replace my water heater but need to shut off the water supply to do so, not sure if these valves are safe to use or old and due for replacement.

Can someone tell me what kind of valves these are and a rough guess as to when they may have been installed?

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Best Answer

I believe it would be called a "block and bleed" cock in industry. "Cock" because it is a 90 degree turn off/on. And the B & B because the small ( 1/2 " ?) knob on the lower part will open to bleed a line when the cock is closed. That of course , assumes that the supply is coming from the top pipe in the view.

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