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Last edited 28 Jun 2021
The Illustrated Guide to Mechanical Building Services, Third Edition (BG 31/2017), by David Bleicher, published by BSRIA in 2017, suggests that a ball valve is: ‘Used as an isolation valve on pipework typically up to 50 mm nominal bore. Located either side of fittings that require regular maintenance, and for isolating sections of pipework.’
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