Product details

BUTTERFLY VALVE - FLANGED (UNI/DIN/BS)

Flanged butterfly valves (UNI/DIN/BS) are a type of butterfly valve with a full-body flange design, installed directly onto pipelines using bolts through the flange according to international standards such as UNI (Italy), DIN (Germany), and BS (UK). This type of butterfly valve is common in water supply, wastewater treatment, HVAC, and industrial systems, especially when high sealing and secure installation are required.

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Basic Concept

Flanged Butterfly Valve: Unlike wafer or U-type butterfly valves, this type has an integral flange body, allowing direct connection to the pipeline with bolts.
Connection standards: UNI/DIN/BS/ISO/ANSI – ensuring compatibility with many international systems.
Applications: Urban water supply systems, water treatment plants, chemical industry, food industry, HVAC.

Technical Specifications

Nominal size (DN): DN50 – DN2000 (depending on manufacturer)
Working pressure (PN): PN10, PN16, PN25, PN40
Operating temperature: -10 °C to 120 °C (depending on seat material: EPDM, NBR, PTFE, Viton)
Valve body: Ductile iron EN-GJS-500-7, carbon steel, stainless steel, epoxy-coated according to GSK standard
Disc: Stainless steel (SS304/316), epoxy-coated ductile iron, or special alloys
Shaft: Stainless steel (410/420/431/304/316)
Sealing seat: EPDM, NBR, PTFE, Viton, Hypalon
Pressure test:
- Shell: 1.5 × rated pressure
- Seat: 1.1 × rated pressure
Operation mechanism: Handwheel, gearbox, or electric/pneumatic actuator