Focus On Triple Offset Butterfly Valve 


Butterfly Valve Metal Seal 300lb-28 inch API Standard Flange Type

Model: D343h-300lb

Origin: Oubei, Wenzhou

Type: Flange Type

Specification: 28 inches

Valve Body: WCB

Valve Disc: CF8

Valve Stem: F304

Sealing Material: SS304 + graphite

Driving Mode: Worm Gear

product details

300lb-28 inch API standard flange type butterfly valve metal seal are widely used in oil, water conservancy and other industrial pipelines with good sealing performance, simple structure and affordable price.

1、 Structure introduction

API standard butterfly valve adopts three eccentric structure. The valve seat seal is metal multi-layer hard seal structure, which is usually the interlayer of metal and graphite, such as 304 + graphite, 316 + graphite. Such hard seal can also be made into single-layer soft seal PTFE, rptfe, ppl, EPDM, NBR, etc

Three eccentric butterfly valve features:
1. Short structure size, small volume, light weight, easy to operate
2. Using the whole shaft mechanism, the butterfly plate has high strength and large flow area
3. The unique three eccentric design reduces the friction loss of the seal and greatly prolongs the service life
4. Metal hard seal is resistant to high temperature, low temperature and high pressure, and has a wide range of applications

2、Relevant standards of API standard butterfly valve

Design and manufacture: API 609
Structural length: API 609
Connecting flange: ASME B16.5
Inspection and pressure test: API 598

Any valve produced by our company is pressed in strict accordance with the pressure test standard, and the zero leakage butterfly valve is allowed to leave the factory only after the pressure is qualified.

Shell strengthSealing strength of high pressure waterAir seal strength

Under the above pressure, the zero leakage can be achieved.
Accept the sampling and full inspection of the third party quality inspection unit entrusted by the customer and the end customer, but explain to us in advance

3、Detailed connection size

Nominal pressureNominal sizeStructural lengthFlange outer circleDrilling centerSealing surface stepeight of sealing surfaceFlange thicknessNumber of flange holes – diameter
300 LBNPS 282921025939.8800286.228-45

4、Material of main parts

Body: WCB
Butterfly plate: CF8
Stem: f3304
Butterfly plate seal: ss304+ graphite
Bracket: WCB
Worm gear box material: QT450

The default support is WCB, and the worm case is made of QT450. We can also produce WCB, CF8 and other materials according to the customer’s requirements

5、About our company

Tkok Valve  is a professional high quality butterfly valves manufacturers, focusing on research and development of butterfly valve series products.
The butterfly valves produced by Tkok Valve, both the valve body and valve disc all use designed casting molds by Tkok Valve company,not use the foundry no matter the wall thickness of the valve body,flange thickness and face to face dimensions,all can meet the requirement of relevant standard.
TKOK VALVE mainly produce eccentric butterfly valves,high performance butterfly valves,and also have good supply for the centerline butterfly valves and fluorine-lined butterfly valves.

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