Metal Seated Bi-directional Butterfly Valve
Principles of double eccentric structure
First eccentricity - Offset a certain distance between the centerline of the sealing seat and the centerline of the valve stem. Make the valve sealing seat a complete round.
Second eccentricity - The valve stem centerline is offset by a certain distance from the valve body (or bore) centerline. At the same time, on the plate, the centerline of shaft hole that install the valve stem is offset the same distance than the external circle centerline outside the butterfly plate.
The function of double eccentric structure
When the butterfly plate is in the process of on/off valve and the valve is in full open state, the sealing surface is completely detached, especially a large gap near the sealing seat of the valve stem, so as to reduce the wear and abrasion of the valve sealing surface, protect the main seal rubber ring of the butterfly valve, and extend the service life.
Performance Characteristics
1.Unique elastic metal sealing ring structure design to ensure isobaric bi-directional sealing performance, reliable sealing performance;
2.Use semi-axial structure with large cross flow area and small flow resistance;
3.Use double eccentric structure, the valve body sealing surface is completely detached from the valve plate sealing surface after opening, no friction, long life cycle;
4.Small size, light weight, light operation;
5.Horizontal mounting manual valve has bi-directional display function, the opening state of the valve can be observed synchronously from the operating surface and side.
Applicable Medium
Widely used in water supply and drainage, metallurgy, petroleum, chemical industry, electric power, urban construction and other industrial pipelines to cut off, connect and regulate the use of medium.
Technical Parameters
| Standards | Design Standards | GB/T 8527 / EN593 / API609 |
| Face-to-face dimension | GB/T 12221 / EN558 / API609 | |
| Flange Standards | GB/T 17241.6, GB/T 9113, GB/T 9115, HG/T 20592, EN 1092,ASME B16.5, ASME B16.47 | |
| Pressure Test Standards | GB/T 13927, EN12266, API598 | |
| Pressure Rating | 0.25MPa ~4.0MPa / Class 150Lb ~300Lb | |
| Nominal Diameter | DN100 ~ DN4000 / 4” ~ 48” | |
| Operation | Lever, Gear Box, Electric, Pneumatic, Hydraulic, Pneumatic-Hydraulic (Gas-Over-Oil), Electro-Hydraulic | |
| Connection | Flanged, Wafer Type | |
| Material Standard | GB, EN, ASTM | |
| Major Component Materials | Valve Body | Ductile Iron, NC Iron, Carbon Steel, Stainless Steel, Duplex Stainless Steel, Nickel-Aluminum Bronze, etc. |
| Valve Disc | Ductile Iron, NC Iron, Carbon Steel, Stainless Steel, Duplex Stainless Steel, Nickel-Aluminum Bronze, etc. | |
| Valve Stem | Stainless Steel, Precipitation-Hardening Steel, Duplex Stainless Steel, Monel, etc. | |
| Seal Ring | Stainless Steel, Duplex Stainless Steel | |
| Applicable temperature |
-30 ~ 120℃ |
|
| Remarks | Flange connection valves also have telescopic butterfly valves available | |
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