Triple Offset Double Flange Carbon Steel Butterfly Valve Dn400

Basic Info

Model NO.	D343H
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
Transport Package	Carton Box+Plywood Case
Specification	CE
Trademark	WENBAO
Origin	China
HS Code	8481804090
Production Capacity	10000PCS/Month

Product Description

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: CF8, CF8M, CF3, CF3M

Company Overview
Zhejiang Wenbao Valve 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.