Ring joint gasket is a type of pressure energized gasket used on pipe flanges, pressure vessels, Valve bonnets handling, high pressure steam, gas, hot oil, solvent vapor at high temperature. DONGSUH’s experienced technology offers many different types so that customers may select the most suitable one in accordance with operating conditions.
| Material | Max. Hardness HB | Popularity | |||||
|---|---|---|---|---|---|---|---|
| | | | | | ||
| Carbon steel | 120 | ○ | ◎ | ◎ | ◎ | ◎ | ◎ |
| Soft iron | 90 | ◎ | ◎ | ◎ | ◎ | ○ | – |
| Copper | 60 | △ | – | – | – | – | ○ |
| SUS 304 | 160 | ◎ | ◎ | ◎ | ◎ | ○ | △ |
| SUS 304L | 150 | ○ | ○ | ○ | ○ | △ | – |
| SUS 310S | 160 | ○ | △ | △ | △ | – | – |
| SUS 316 | 160 | ◎ | ○ | ○ | ○ | – | △ |
| SUS 316L | 150 | ○ | ○ | ○ | ○ | – | △ |
| SUS 321 | 160 | ○ | △ | △ | ○ | – | – |
| SUS 347 | 160 | ○ | △ | △ | △ | – | – |
| SUS 410 | 170 | △ | △ | △ | △ | ○ | – |
| SUS 430 | 170 | △ | △ | △ | △ | – | – |
| 5Cr-1/2Mo | 130 | ◎ | ○ | ○ | ○ | △ | – |
| Monel | 140 | ◎ | – | ○ | △ | – | – |
| Titanium | 160 | ○ | – | ○ | △ | – | – |
| Aluminium | 40 | △ | – | – | – | ◎ | ○ |
| Nickel | 120 | ○ | – | – | △ | – | – |
NOTES: ◎ is popularly used. ○ is sometimes used and △ is rarely used.
| Cross Section | Name | Description | |
|---|---|---|---|
| Oval Ring Joint Gasket | | ALS2000-O | This type is the original joint design, Contacts flange face at the curved surface and provides a high reliadility seal, But due to its shape, it is harder to achieve accuracy of dimensions and surface finish in oval type than in octagonal one and also more expensive to make, reuse is not possible, Complies with ANSI B16, 20, AP16A, JIS F 7102 510SR, JPI-7S-23-63. |
| Oval Ring Joint Gasket | | ALS2000-C | More economical to make and more accurate in dimensions and surface finish than oval type because it consists of straight surfaces only, But more torque load is required to flow the gasket material into imperfections on the flange facings. reuse is possible. complies with the same standards as above. |
| Lens Ring Gasket | | ALS2000-L | Desinged to DIN 2696 Bolt load will be comparatively small, because its confact surface with flange face is spherical. |
| Double Cone Ring Gasket | | ALS2000- DC | Auto seal type gasket, For effective sealability, aluminium sheets of 1.5~2.0mm are used together, Used for pressure vessel. |
| Pressure Seal Ring Gasket | | ALS2359 | Auto seal type gasket, it is called a seal ring when this gasket is used for valve. Used for valve bonnet pressure vessel, heat exchanger |
| Delta Ring Gasket | | ALS2000-D | Auto seal type gasket, For effective sealability, silver is plated on surface. Used for pressure vessel. |
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