Multi-layer toothed combined gasket (DCGG series)
Cixi Hengli Sealing Materials Co., Ltd. patented new product (Patent No.: ZL201420339040.9) multilayer tooth-shaped composite gasket (DCGG series), which uses two single-sided tooth-shaped composite gaskets and a high-elasticity non-metallic gasket. become. The tooth-shaped structure of the single-sided tooth-shaped composite gasket is different from the traditional tooth-shaped gasket, and it is also different from the wave-tooth composite gasket. This unique tooth-shaped structure makes the non-metal composite layer composite stronger, and the surface stress of the gasket is The distribution is more even. The combination of multi-layer metal framework and multi-layer non-metallic layer enables the gasket to obtain greater elastic deformation.
Suitable for flange sealing of large diameter pipeline flanges (DN600 or more than 24"), pressure vessels, heat exchangers, filters, towers and other equipment.
The sealing effect is better than corrugated composite gaskets in the occasions where the temperature or pressure is alternating and the equipment is vibrating.
Multi-layer toothed gaskets are divided into basic type (A) and outer ring type (C). The type of multi-layer tooth-shaped composite gasket used in the heat exchanger is based on the description of JB/T 4718.
The basic type (A) multi-layer tooth-shaped combination gasket is suitable for concave and convex flanges (MFM) and bar groove flanges (TG).
Outer ring type (C) multi-layer toothed combined gaskets are suitable for raised face flanges (RF) and flat flanges (FF).
应顾客要求，也可对垫片内径侧进行包变处理，进行内包变处理的多层齿形组合垫片结构如下图:
Advantages of multi-layer toothed gaskets (DCGG series):
• The gasket is an integral structure, and there is no risk of collapse of the spiral wound gasket;
• The special tooth structure makes the surface stress distribution of the gasket body more even when in use, which helps to improve the sealing effect and prolong the service life of the gasket
• The combination of multiple non-metallic layers on the tooth-shaped structure on both sides of the sealing surface and the gap between the two tooth-shaped frameworks enables the gasket to obtain greater elastic deformation (elastic deformation rate), which can make The pre-tightening stress of the gasket to achieve the sealing effect is reduced, and the sealing effect of the gasket is better than that of the corrugated composite gasket in the occasions of alternating temperature or pressure and vibration of the equipment. The leakage rate is shown in the attached table:
| Gasket load | Leak rate |
|
35Mpa |
1.6*10⁻⁸ |
|
50Mpa |
2.2*10⁻⁸ |
|
70Mpa |
1.9*10⁻⁸ |
• Table of available materials for outer positioning ring, toothed frame sheet and inner edging strip
| Alloy strip material name | Jane (abbreviation) | Alloy strip material name | Jane (abbreviation) |
|
0Cr18Ni9 |
304 |
Ti |
Ti |
|
00Cr19Ni10 |
304L |
Ni-Cu alloy (Monel400) |
Monel |
|
0Cr17Ni12Mo2 |
316 |
Ni-Mo alloy (Hastelloy B2) |
HAST B |
|
0Cr17Ni14Mo2 |
316L |
Ni-Mo-Cr alloy (Hastelloy) C276) |
HAST C |
|
0Cr18NH0Ti |
321 |
Ni-Cr-Fe alloy (Inconel 600) |
INC 600 |
|
0Cr18Ni11Nb |
347 |
Ni-Fe-Cr alloy (Incoloy 800) |
IN 800 |
|
0Cr25Ni20 |
310 |
|
|
The non-metallic layer can be made of flexible graphite (G), expanded polytetrafluoroethylene (F), ceramic fiber (C), high temperature mica (M)
Product mark description: (the tooth-shaped skeleton material is the same as the material of the inner sideband)
Basic type (A): type symbol-tooth profile frame material / non-metallic layer material DN PN (flange surface type symbol)
Such as: DCGGA 304/G DN50 PN1.6 (TG), DCGG A 304/G DN50 PN1.6 (MFM)
Outer ring type (C): type symbol-tooth-shaped frame material/non-metallic layer material (positioning ring material) DN PN (flange surface type symbol)
Such as: DCGG C 304/G (304) DN50 PN1.6 (RF), such as DCGG C 304/G (304) DN50 PN1.6 (FF)
DCGG C 304/G (304) DN80 PN2.0 (RF) test indicators under each pressure level (compression rate, rebound rate, nitrogen leakage rate)
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The maximum working pressure can reach 42.0MPa.
The maximum operating temperature can reach 600°C.
Maximum operating temperature: oxidizing gas: 450°C; non-oxidizing gas: 800°C.
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