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28" API Standard A series stainless steel butterfly valve flange type
Model: D343w-300lb
Origin: Oubei, Wenzhou
Type: Flange Type
Specification: 28 inches
Valve Body Material: CF8
Valve Disc Material: CF8
Valve Stem Material: F304
Sealing Material: SS304 + graphite
Driving Mode: Worm Gear
product details
28″ API Standard a series stainless steel butterfly valve flange type 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 strength | Sealing strength of high pressure water | Air seal strength |
| 7.5 | 5.5 | 0.6 |
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 pressure | Nominal size | Structural length | Flange outer circle | Drilling center | Sealing surface step | eight of sealing surface | Flange thickness | Number of flange holes – diameter |
| 300 LB | NPS 28 | 292 | 1025 | 939.8 | 800 | 2 | 86.2 | 28-45 |
4、Material of main parts
Valve body: CF8
Butterfly plate: CF8
Stem: f304
Butterfly seal: SS304 + graphite
Bracket: CF8
Worm gear box material: QT450
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 molds.so 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.