When a check valve is required by Sentence 7.6.1.5.(1), or a backflow preventer by Articles 7.6.2.2., 7.6.2.3. or 7.6.2.6. or a pressure reducing valve by Article 7.6.3.3., protection against thermal expansion may be required.
When a check valve is required by Sentence 7.6.1.5.(1), or a backflow preventer by Articles 7.6.2.2., 7.6.2.3. or 7.6.2.6. or a pressure reducing valve by Article 7.6.3.3., protection against thermal expansion may be required.