A dry pipe valve system is often used in industrial and commercial fire sprinkler systems. This type of piping system fills the pipes with pressurized air or nitrogen instead of water. The air contains a remote valve, also known as a dry pipe valve, in a closed position.

How does a dry valve work?

Located in a heated space, the dry-pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate. Once this happens, the air escapes and the dry pipe valve releases. Water then enters the pipe, flowing through open sprinklers onto the fire.

What does dry pipe mean?

noun. : a sprinkler system in which water is admitted to the system upon the release of air pressure that the pipes normally contain and which is used where there is danger of freezing.