Composite Air Valve

ISO 2531 Ductile iron pipes, fittings and accessories for pressure pipelines.
BSEN545 Ductile iron pipes, fittings and accessories and their joints for water pipelines. Requirements and test methods.
BSEN598 Ductile iron pipes, fittings, accessories and their joints for sewage application-requirements and test methods.
ISO7186 Ductile iron pipes, fittings, accessories and their joints for the construction of drains and sewers outside buildings.
ISO4179 Ductile iron pipes for pressure and non pressure pipelines-Centrifugal cement mortar lining-general requirements.
ISO8179 Ductile iron pipes-External zinc coating.
ISO4633 Rubber Seals – joint rings for water supply, drainage and sewerage pipelines-specs for materials.
ISO 8180 Ductile iron pipes – Polyethylene SleeveGUOSHUN products strictly meet the below