Double eccentric butterfly valve EN558 series 13 flange type, which can be used in water supply and drainage project.

Details

Details

Double eccentric butterfly valve EN558 series 13 flange type technical specification:

Nominal Diameter: DN100–DN2400

Nominal Pressure: 10Bar/16Bar/150lbs/25bar

Design Standard: BS EN593/BS5155/API609/DIN3354

FTF Dimension: ISO 5752 SERIES 13&14 /BS EN558 SERIES 13&14 /API609/DIN3202/ASME B16.10

Flange Connection: ASME B16.1 Class125/ASME B16.5 CL150/ASME B16.47 CL150/AWWA C207/

DIN 2501 PN10-16-25/EN1092 PN10-16-25

Inspection and Test: EN12266-1/API 598/ISO5208

Material list:

Body

Ductile Iron: ASTM A536 60-40-18/ DIN1693 GGG40,GGG50
Carbon Steel: ASTM A216 WCB
Stainless Steel: ASTM A351 CF8/CF8M

Disc

Ductile Iron: ASTM A536 60-40-18/ DIN1693 GGG40,GGG50
Carbon Steel: ASTM A216 WCB
Stainless Steel : ASTM A351 CF8/CF8M
Bronze AL-Bronze: ASTM B148 C954

Stem

Stainless Steel: ASTM A182 304/316/410
Alloy: Monel K500

Seat SS304/SS316/Brass
Sealing Ring EPDM/NBR
Retaining Ring Carbon Steel/SS304/SS316
Screw Carbon Steel/SS201/SS304/SS316
Packing NBR/EPDM/VITON/Flexible Graphite
Yoke Cast Iron/Carbon Steel
Bushing PTFE/Bronze
Pin

Stainless Steel ASTM A182 304/316/410
Alloy Monel K500

Advantages of Double eccentric Butterfly Valve

1.The double eccentric butterfly valve shaft is placed offset to one side of the valve centerline. Benefits of this valve versus a single eccentric is that the valve seat and the disk will not contact while traveling. The disc will cam away from the seat while opened, and contact is not established before the final shut off position.

2. The double eccentric type is the difference of the pressure-area on the disc. Since the stem is offset to one side the pressure area will be slightly bigger on one side of the shaft. If the valve installed in the preffered direction the process pressure will help the valve making a better sealing.

3. Small operation torque of big size butterfly valve