PRESSURE REDUCING VALUES
There are two general types of PRwile those that reduce pressure only while water is flowing, and those that regulate the pressure under both flowing and nonflowing (static) conditions. PRVs are used in both sprinkler and standpipe* systems to prevent system overpressurization.
When a sprinkler system supply is taken off of the standpipe riser, a PRV should be installed to prevent overpressurization of the sprinkler system. This type of PRV valve will operate both in a flowing and in a static condition.
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