A PRV will only provide pressure control and only work properly when installed in correct direction of flow. The valve bodies are marked with an arrow to indicate flow direction. They do not have a check valve or act lke a backflow preventer that is why you will usually see a backflow preventer installed before the PRV. Backflow preventers are a requirement in a hydronic system.
A PRV will only provide pressure control and only work properly when installed in correct direction of flow. The valve bodies are marked with an arrow to indicate flow direction. They do not have a check valve or act lke a backflow preventer that is why you will usually see a backflow preventer installed before the PRV. Backflow preventers are a requirement in a hydronic system.