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Radially reinforced prestressed gasket YYLG series
Number of views:
1000

Radially reinforced prestressed gasket YYLG series

The radially reinforced pre-stressed gasket YYLG is a patented new product of Hengli Sealing. It has an innovative sealing body material and structure. The inner and outer sides of the sealing element are multi-turn special-shaped reinforced alloy belts. The special-shaped reinforced alloy belt plays a role in the sealing body. Protection and radial reinforcement. The main body of the seal is made of high-elasticity, high-temperature and corrosion-resistant special flexible graphite tape wound and molded.
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Number of views:
1000
Product serial number
A-026
Category:
Gasket Series
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Detail
Parameters

• There are three types of YYLG gasket structure: Type I, II and III

 

Type I
No inner ring and outer ringFor birch groove surface (TG) flange

Type II
Inner ring onlyFor concave and convex (MFM) flanges

Type III
There are inner ring and outer ring
For full-face FF or raised face RF flanges

 

 

• 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

 

 

 

 

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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