Butterfly Valves

Butterfly valves of Weidouli are widely used in chemical industry, petrochemical industry, marine development, smelting, etc., as regulating and closing equipment.

The seat and disc of our butterfly valve employ the most advanced technology to complete the structural design. At the very moment when the disc opens and closes, the disc produces a cam action, which can pull the disc with less effort, greatly reduces the wear and deformation of the valve seat, and increases the service life of the valve.

The Details Of Butterfly Valves

The Drawing Of Butterfly Valves

Catalog
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Types Of Butterfly Valves

Titanium Butterfly Valves +

Nickel Butterfly Valves +

Monel Butterfly Valves +

Hastelloy Butterfly Valves +

Inconel Butterfly Valves +

Duplex Butterfly Valves +

Super Austenitic Butterfly Valves +

NAB C95800 Butterfly Valves +

Stainless Steel Butterfly Valves +

Zirconium Butterfly Valves +

Tantalum Butterfly Valves +

Weidouli Butterfly Valves Have Double offset And Triple Offset Both Types

ASME butterfly valve as citing
Design1	API 609
Testing	API 598
Face to face dimension	API 609
Flange ends dimension2	ASME B16.5,ASME B16.47 Series A
Pressure Temperature Rating	ASME B16.34
Visual inspection of casting	MSS-SP-55

Notes:

*Other designs are available upon request. BS EN593,DIN,JIS,GB /T 12238etc.

Double offset butterfly valves specification:

Anti-static
Blow-out proof stem
V type packing
Zero leakage
Ends: Wafer, Lug.
Unidirectional/Bi-directional sealing
Operation: Lever, Gear, Electric, Pneumatic actuator
Bare shaft with ISO 5211 top mounting flange

Applicable seat materials of double offset butterfly valves

PTFE
RPTFE(15% Glass Filled)
RPTFE(25% Carbon Filled)
Viton
Other materials can be supplied upon request

Size/Pressure produce range		Operator
Pressure	Wafer/Lug	Operator
150LB	2” up to 100”	2"~4" Lever; 5"~100" Gear
300LB	2” up to 60”	2"~4" Lever; 5"~60" Gear
600LB	On application

Triple offset butterfly valves specification

1st Offset: It is accomplished by moving the centerline of the shaft away from the seat surface.
2nd Offset: It is accomplished by moving the centerline of the shaft offset from the centerline bore of the valve.
3rd Offset: It is accomplished by adjusting the cone angle created by the 1st and 2nd offset angles at some point downstream of the valve in the center of the piping to the adjacent piping wall.
By incorporating the 3 offsets into one design eliminates any risk of friction and jamming of the disc on the seat. This increases valve life time, the driving torque is very low, in comparison with other types of valves

Triple offset butterfly valves specification:

Anti-static
Blow-out proof stem
Fire safe API 607
V type packing
Zero leakage
Ends: Wafer, Lug, Double flange.
Uni-directional/Bi-directional sealing
Operation: Lever, Gear, Electric, Pneumatic actuator
Bare shaft with ISO 5211 top mounting flange (when specified)

Applicable seat materials of triple offset butterfly valves

Metal with Graphite
Metal with PTFE
Other materials can be supplied upon request

Size/Pressure produce range		Operator
Pressure	Wafer/Lug/Flange	Operator
150LB	3” up to 80”	3"~4" Lever; 5"~80" Gear
300LB	3” up to 40”	3"~4" Lever; 5"~40" Gear
600LB	On application