Triple Offset Fully Metal to Metal Seated Butterfly Valve,two
directional flow
The design of renewable seat and seal ring could avoid the valve
damaged caused by the wear of seal ring and reduce the cost of use.
Its advantages are anti-wear, anti-erosion and long service
life,etc. Kelite butterfly valve suitable for mant poor working
conditions such as high pressure and high temperature.
he pressure of bidirectional flow could be afforded to achieve no
flow restrictions on the installation.
The first eccentricity:
The deviation between stem rotation center and the seat centerline
ensures a tight seal between the seat and disc.
The second eccentricity:
The deviation between sealing cone center and the valve centerline,
when the valve opens, can make the butterfly plate leaves sealing
surface quickly.
The third eccentricity:
The deviation between sealing cone center and the valve centerline,
when the valve opens or closes, can eliminate the friction between
the disc sealing surface and seat.
ASME Standard
| Design and Manufacture Standard: | API 609 | Inspection Test Standard: | API 598 |
| Material Pressure-temp. Standard: | ASME B16.34 | Flange ends: | Size≤24” according to ANSI B16.5 |
| Face to Face: | Flange Short Pattern to ISO5752 Basic Series 13 | Dimension Standard: | Size≥24” according to ANSI B16.47 Series B |
| Dimension Standard: | Flange Long Pattern to ASME B16.10 | Fire Safe Standard: | API 607 |
| Pressure | Testing Pressure at Constant Temp.(MPa) | Applicable Temp. | Applicable Medium |
Class (LB) | Shell Test | Seal Test | Air Test | -46℃~550℃ | W.O.G. etc. |
| 150 | 3.0 | 2.2 | 0.6 |
| 300 | 7.58 | 5.52 | 0.6 |
| 600 | 15.0 | 11.03 | 0.6 |
| 900 | 22.5 | 16.5 | 0.6 |
DIN Standard
| Design and Manufacture Standard: | DIN 2559 | Pressure Test: | EN 12266-1 |
| Pressure | Testing Pressure at Constant Temp.(MPa) | Applicable Temp. | Applicable Medium |
| Shell Test | Seal Test | Air Test |
Nominal Pressure | 1.0 | 1.5 | 1.1 |
0.5-0.7
| -40℃~570℃ | W.O.G. etc. |
| 1.6 | 2.4 | 1.76 |
| 2.5 | 3.75 | 2.75 |
GOST Standard
| Design and Manufacture Standard | JB/8527 API609 | Pressure Test | GB/T 13927 API598 |
| Pressure | Testing Pressure at Constant Temp.(MPa) | Applicable Temp. | Applicable Medium |
| Shell Test | Seal Test | Air Test |
Nominal Pressure | 1.0 | 1.5 | 1.1 |
0.5-0.7
| -40℃~570℃ | W.O.G. etc. |
| 1.6 | 2.4 | 1.76 |
| 2.5 | 3.75 | 2.75 |
Characteristics
Triple eccentricity refers to an angle eccentricity added on the
basis of the double eccentric structure, as the butterfly valve
sealing surface shows an oblique cone. This structure is
characterized by the outer side of the disc to be processed into an
oblique cone, and also the inner side of the sealing seat is
processed into an oblique cone. At this time, the section of the
valve sealing surface the becomes oval, thus the shape of the disc
sealing surface is under the vertical asymmetry. Because the
sealing surface is the oblique cone, the large part of the disc
separated by the stem shaft presses the seat upwards along the
large inclined surface, and the large part of the disc presses the
seat downwards along the small inclined surface. The seal between
the disc sealing ring and the seat does not rely on the elastic
deformation of the seat, but completely depends on the compact of
the touching surface. So there is no friction in the process of the
triple eccentric butterfly valve basically opening and closing, and
the valve closes tightly with the closing pressure increasing. It
is obvious from the principle and structure of the triple eccentric
butterfly valve, the triple eccentric butterfly valve has the
following advantages:
1) The sealing performance and reliability of the system are
improved.
2) The friction is low, and the valve opening and closing flexibly.
3) The valve service life is longer and it could switch repeatedly.
4) The resistance of pressure and high temperature is improved, and
the range of applications is wide.
Characteristics
1. Kelite butterfly valve is characterized by simple structure,
small volume and light weight, and it is easy to install and
adjust.
The valve is widely used in the medium and low pressure pipeline.
2. Good sealing performance,corrosion resistance,high pressure and
temperature resistance, smart control and safe use.
3. The unique design of triple eccentricity makes no friction
between the sealing surface and extend the valve service life.
4. The elastic seal is produced by the torque.
5. The wedge design makes the valve close more and more tightly by
automatic sealing function, and there’s compensation
and zero leakage between the sealing surfaces.
Material for Main Parts
| Parts Name | Material |
| Body | WCB, 304, 316, 316 L, CF8M,etc. |
| Disc | WCB, 304, 316, 316 L, CF8M, etc. |
| Stem | 316, 2Cr13, 1Cr18Ni9Ti, etc. |
| Sealing Ring | 316, Fluorine Plastic, etc. |
| Packing | Flexible Graphite, Fluorine Plastic, etc. |
