Butterfly valve
Pneumatic clamp butterfly valve

Design and manufacture: GB12238-89 standard
Structure length: GB12221-89 standard, GB/T15188.1-94 standard
Flange connection: GB/T17241.6-98 and GB9115-88, GB12380-90, GB4216.4 standard
Flow rate and flow resistance coefficient: JB/T5296-91 standard
Pressure test: GB/T13927-92 standard
Life test: JB/Z248-85 standard
Valve mark: GB12220-89 standard
Product label: JB8 standard
Model preparation: JB308-75 standard
Electric device: GB/T8528-1997 and GB12222-89, GB12223-89 standard
Manual device: JB/T8531-97 standard
Paint film test and painting: GB9286, SDZ014 standard
Steel surface corrosion, derusting grade: GB8982 standard
Packaging, storage and transportation pictorial signs: GB4879 standard
Anti-rust packaging: GB191 standard
Supply requirements: GB12252 standard
Material: gray cast iron HT200-400 meets GB12226-89 standard; ductile iron QT450-10 meets GB12227-89 standard; carbon steel Q235A meets GB12228-89 standard; stainless steel meets GB1220 standard; copper alloy meets GB12225-89 standard; Rubber NBR meets HG4-329 standard; graphite filler JB1712-91 standard; general valve material JB/T5300-91 standard;