2000BS EN 1567:2000 Building valves. Water pressure reducing valves and combination water reducing valves. Requirements and tests
2000BS EN 1567:1999 Building valves - Water pressure reducing valves and combination water reducing valves - Requirements and tests
1991BS 6283-4:1991 Safety and control devices for use in hot water systems - Specification for drop-tight pressure reducing valves of nominal size up to and including DN 50 for supply pressures up to and including 12 bar