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Radially reinforced prestressed gasket YYLG series
Item No.：
A-026
Category：
Summary
We offer a wide range of services including product and tool design, hot forging, casting, deep draw (cold extrusion), cold heading, high precision CNC machining, surface finishing, and sub-assembly. Our main products are high precision accessories of Power system, electrical and telecommunication industry,
TEL：+86-574-63013766
E-mail：hengli@china-sealing.com
Keywords：
Description
• There are three types of YYLG gasket structure: Type I, II and III
 |
 |
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|
Type I |
Type II |
Type III |
• Significant features of radially reinforced pre-stressed gasket (YYLG):
YYLG can obtain better elastic deformation with a lower pre-tightening stress: t4.5mmYYLG can obtain an elastic deformation of 0.3mm under the condition of 35Mpa locking loading stress, which means easier installation and also shows that YYLG has enough additions Preload compression margin, so YYLG has a longer service life.
The elastic deformation capacity of YYLG is better than that of metal corrugated gaskets and metal spiral wound gaskets: Under the same test conditions, the elastic deformation rate (compression rate * resilience rate) of YYLG is much higher than that of flexible graphite metal spiral wound gaskets specified in GB4622.3 The elastic deformation rate (3.06% at 70Mpa is qualified) and the elastic deformation rate of flexible graphite metal corrugated gaskets specified in GB19066.3 (3.75% at 45Mpa is qualified). Excellent elastic deformation ability ensures excellent sealing performance when working conditions change.
YYLG has better sealing performance than flexible graphite metal spiral wound gasket and flexible graphite metal corrugated composite gasket.
The YYLG sealing body is a flexible body, which can better adapt to the flange sealing surface conditions and flange locking conditions, and the installation conditions are adaptable.
The main body of the YYLG seal is a molded and flexible whole, and the gasket will not collapse and the surface non-metallic composite layer will fall off.
YYLG seal body has several elastic alloy belts on the inner diameter side and outer diameter side respectively, which protect the special flexible graphite sealing belt with high elasticity, high temperature and corrosion resistance, and ensure the sealing safety when the medium pressure increases sharply and the medium is under high pressure.
• Scope of application:
Where the outer diameter of the gasket is 800mm, such as pipeline flanges and equipment flanges within 24' of the American standard or DN 600 of the European standard.
Applicable temperature -200°C ~ 650°C (oxidizing medium occasion ≤450°C); applicable pressure ≤25Mpa.
Applicable medium: related to the selected metal material.
It still has excellent sealing performance in the occasions of temperature and pressure cycling, equipment or pipeline vibration and shaking.
Optional alloy belt material table
| Taijin belt material name | Jane (abbreviation) | Alloy strip material name | Jane (abbreviation) |
|
0Cr18Ni9 |
304 |
Ti |
Ti |
|
00Cr19Ni10 |
304L |
Ns-Cu alloy (Monel400) |
Monel |
|
0Cr17Ni12Mo2 |
316 |
Ni-Mo alloy (Hastelloy B2) |
HAST B |
|
0Cr17Ni14Mo2 |
316L |
Ni-Mo-Cr alloy (Hastelloy) C276) |
HAST C |
|
0Cd8Ni10Ti |
321 |
Ni-Cr-Fe Taijin (Inconel 600) |
INC 600 |
|
0Cr18Ni11Nb |
347 |
Ni-Fe-Cr alloy (Incoloy 800) |
IN 800 |
|
0Cr25Ni20 |
310 |
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The elastic deformation rate and nitrogen (N2) test leakage rate under each pressure level
| Final load gasket stress |
Elastic deformation rate（%） |
Leakage rate (medium N2) | |
| Medium pressure |
cm³/s |
||
|
35 Mpa |
6.97 |
2.55 |
2.02*10⁻⁵ |
|
45 Mpa |
7.49 |
2.55 |
1.59*10⁻⁵ |
|
68 Mpa |
8.15 |
5.0 |
3.25*10⁻⁵ |
The ammonia leakage rate detection meets the requirements of EN 14772. When the gasket test stress is 20Mpa, it is <2.0*10⁻⁷ cm³/s, and when the gasket maximum test stress is 100Mpa, it is 1.3*10⁻⁷ cm³/s.
• Product mark description: (The inner ring material is the same as the reinforced alloy belt by default)
Type I, Type II: YYLG type symbol-alloy belt material DN PN (flange surface type symbol)
Such as: YYLG I 304 DN50 PN1.6 (TG), YYLG II 304 DN50 PN1.6 (MFM)
Type III: YYLG type symbol-alloy belt material (positioning ring material) DN PN (flange surface type symbol)
Such as: YYLG III 316 (304) DN50 PN1.6 (RF), YYLG III 316 (304) DN50 PN1.6 (FF)
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