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Metal Seated Triple Eccentric Flanged Type Butterfly Valve with Gear
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.
A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.
There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc.
Standards
Standard
Manufacture Standard
Flange Standard
Face-to-face Standard
Test Standard
GB
GB/T12238-1989
GB/T9113.1-2000
GB/12221-89
GB/T13927-92
API
API 609-91
ANSI 16.5a-92
ANSI B1.10-92
API 598-94
ANSI B16.34-96
MSS-SP-44
JIS
JIS B2004-84
JIS B2212~2216
JIS B2002-87
FIS B2003-87
Technical Specifications
Nominal Diameter
DN(mm)
100~300
100~600
Nomical Pressure
PN(Mpa)
0.6
1
1.6
2.5
4
Test Pressure
Shell Test
0.9
1.5
2.4
3.75
6
Sealing Test
0.66
1.1
1.76
2.75
4
Air Test
0.6
0.6
0.6
0.6
0.6
Suitable Medium
water, steam, oil, corrosion medium, dust, etc
Applicable Temperature
-29ºC≤carbon steel≤425ºC, -40ºC≤stainless steel≤600ºC, AF13Cr-Mo steel≤650ºC
Operation
Handle, gear, electric actuator, pneumatic actuator
Main Parts & Materials
Part Name
Material
Body
Carbon steel, stainless steel, Cr-Mo steel, alloy steel
Disc
Carbon steel, stainless steel, Cr-Mo steel, alloy steel
Seat Ring
316+soft graphite, PTFE
Stem
45#, 2Cr13, SS, Cr-Mo steel
Packing
Soft graphite, PTFE
Remarks: cast steel: WCB, alloy steel: WC6,WC9, Cr-Mo steel: ZG1CrMo, stainless steel:Â CF8, CF8M, CF3, CF3M
Company Overview
Zhejiang Wenbao Valve Co.,Ltd was established in 1985. The main products range are as following: Fully Welded Ball Valve,1PC/2PC/3PC Flanged Ball Valve, Threaded Ball Valve, Mini Ball Valve, High Pressure Ball Valve, Pneumatic Ball Valve, Electric Ball Valve, Sanitary ball valve, Ball valve with mounting pad and other valves like gate, globe, check valves and Strainer, etc. Main material include: Stainless steel, Cast Steel, Forged Steel and Brass, etc. The products manufactured as per API, ANSI, JIS, ISO, BS, JB and GB, and have CAD valve design and quality testing center. The products are widely used in chemical industry, oil, metallurgy, light industry, electric power, food, pharmacy, civil industry, fiber industry, liquefied natural gas, liquefied petroleum gas, steel mills, heating pipes, etc. Our company passed the ISO 9001:2008, Standards Organization of Nigeria(SON), International Quality Award Certificate, Manufacture License of Special Equipment, KC of South Korea,CE of Europe, etc.
Model NO.: D341H
Working Temperature: Normal Temperature (-40°C<T<120°C)
Material of Seal Surface: Metal Hard Sealed
Valve Body: Casting
Application: Water,Oil,Air
Size Range: Dn50~Dn3000
Body Material: Carbon Steel/Stainless Steel/Alloy Steel
Test Standard: API 598
Place of Origin: Wenzhou
Trademark: WENBAO
Transport Package: Carton Box+Plywood Case
Specification: CE
Origin: China
HS Code: 8481804090