Anti-freezing of on-site fire hydrants
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The fire hydrants at our site don’t need to be protected from freezing in winter. A colleague said that water is available when they are used, and the hydrants release the water on their own when not in use. What is the principle behind this?
This post was last edited by ylb913 on 2016-3-2 at 19:02. The valve core and seat of the fire hydrant are located at the bottom (I’ve always referred to it as the “bottom valve”). When the valve is closed, a drainage outlet located above the seat opens as well, allowing the water above to flow out and seep into the ground.
It is indeed. I’ve taken one apart and seen it.
What everyone is referring to are the so-called \"above-ground fixtures.\" In principle, that’s correct. Unfortunately, given our level of manufacturing capability, well… plus the fact that the authorities in charge of fire safety regulations range from those involved in equipment manufacturing to those responsible for oversight and evaluation, it’s better not to talk about it. Again, if possible, it’s better to use below-ground fixtures; it just requires a higher initial investment, but it avoids unnecessary troubles