Flanged Double Offset Butterfly Valve

Flanged Double Offset Butterfly Valve

Basic information
Basic information
This valve is used as an opening and closing device. It can be added with extension stem, electrical installation and change into horizontal butterfly valve.
Features
Features
1. Double offset structure, sealing surface wear not easily;
2. Sealing of disc  is made of surfacing stainless steel and is resistant to corrosion;
3. Rubber sealing ring is inserted on the valve body with special technology and does not come off;
4. Bidirectional sealing.
Principle
Principle
In concentric butterfly valve on the basis of the further improvement of forming, structure characteristic is in the center of the axis of the stem is deviating from the butterfly plate, also deviates from the center of ontology, the valve is opened after the disc can quickly out of the seat, greatly eliminates the disc and valve seat of unnecessary excessive extrusion, scraping phenomenon, reduce the open resistance, reduce the wear and tear, improve the working life of the seat.
Installation and Commissioning
Installation and Commissioning
This valve can be installed at any angle of the pipeline, should be closed installation is appropriate; When welding the pipeline flange, the valve seal mouth should be blocked with a plate to prevent the particles and debris from bruising the sealing surface. After welding, remove the valve, clean the sealing surface of the valve and the inner cavity of the pipeline, and then install the fixed valve. For specific use, please consult ZhengFeng Valve Group.

Part

Material

Standard

Body

Ductile Iron

EN 1563/DIN 1693

Disc

Ductile Iron+Stainless Steel 431

EN 1563/EN10088-1

Stem

Stainless Steel 431

EN10088-1/ASTM A959

Sealing

EPDM / NBR

ISO 4633

Packing

EPDM / NBR

ISO 4633

Worm Actuator

Ductile Iron

EN 1563/DIN 1693

For the materials options not listed, consult factory.

ZhengFeng manufactures valves in more than 50 different alloys.

Product scope, Standards & Materials
Size Range: 2"~144"
Pressure Rating: 10bar ~ 25bar
Face to Face Dimensions: AMSE B16.10, EN558-1
Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2
Coating: Fusion Bonded Epoxy Coating
Inspection and Test: ISO 5208 / EN 12226-2

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