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HLG550 spring reinforced metal sealing ring
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1000

HLG550 spring reinforced metal sealing ring

The spring-reinforced metal sealing ring is a spring-reinforced metal sealing ring, which has the advantages of good fit, outstanding sealing performance and low tightening force. It can be used in vacuum, extremely low temperature and high temperature environment, and it will not produce indentation on the flange after use. Its sealing leakage rate can reach 1×l0⁻⁹std.cc/sec, and it can be used in machinery, precision instruments, nuclear power, aviation, petrochemical and other fields with high sealing requirements.
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Product serial number
A-027
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Gasket Series
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Detail
Parameters

Structure and principle

 

The spring-strengthened metal sealing ring is composed of an outer layer of soft coating material or coating, an inner liner made of metal material, and a wrapped spiral close-wound spring. When the sealing ring is locked and compressed, the elastic force of the spiral spring acts on the inner lining to fit the flange sealing surface, and the soft material or coating layer covered by the outer layer fills up the roughness of the flange surface and prevents the leakage channel between the end surfaces. Produce, and finally achieve an excellent sealing effect.

 

 

 

Main features

 

• Scope of application:
  Diameter: from 5mm to 7m, cross section from 1.7mm to 10mm or larger;
  Temperature: ultra-low temperature to 980°C;
  Pressure: from vacuum to 300Mpa;
• Compression resilience: The spring-strengthened metal sealing ring has excellent flange surface compensation performance under alternating temperature and pressure conditions, and the compression rate can reach 20%;
• Low pretension;
• Excellent resistance to relaxation;
• Excellent corrosion resistance and radiation resistance;
• Suitable for most standard flanges or non-standard flanges or special structures;

 

Materials used

 

• Lining and covering

Part Material delivery status hardness Reference standard
Inner lining and outer covering Stainless steel 304, 316, 321 Solid solution ≤92HRB GB/T 3280s ASTM A240
Nickel N200 annealing ≤70HRB GB/T2054, ASTM Bl 62
Nickel alloy 600, nickel alloy 800 annealing ≤92HRB ASTM B 168、ASTM B 409
Aluminum 1050A annealing ≤25 HV GB/T 3880
Copper T2, Monel annealing ≤70 HV GB/T 2040、GB/T 5231
Gold, silver 99.90% purity  

 

• Plating or coating

part skills requirement Reference standard
Gold, silver, nickel Purity≥99.9  
PTFE, graphite or others Depends on working conditions As required

 

• Coil spring

part Material Reference standard
spiral Stainless steel 304, 316, 321 GB/T4356、JIS G4314
spring Nl-Fe-Cr X750 ASTM B 637

 

 

use pressure

 

Determine the working pressure of the sealing ring according to the C-shaped opening direction of the spring-strengthened metal sealing ring. When the C-shaped opening faces the pressure direction, a self-tightening sealing effect can be achieved, and the pressure that can be withstood can also be greatly increased. However, when choosing whether the C-shaped opening faces the pressure direction, the choice of medium type and coil spring material should be considered.

 

Non-media-oriented Medium-oriented
High vacuum~7Mpa Vacuum ~300Mpa

 

 

Model classification

 

 

 

 

Diagram

 

 

 

Performance curve

 

After the installed spring-reinforced metal sealing ring reaches the set compression amount, it can maintain a certain rebound during the working process. This compensation performance ensures that the sealing surface can always fit during the temperature and pressure changes. . For the convenience of installation, the spring-reinforced metal sealing ring works under the condition of a limited position, which also avoids uneven force, excessive compression or insufficient compression.

The diagram shows the relationship between the load and leakage when the spring-strengthened metal seal is compressed and decompressed. It is mainly composed of two curves, one is the compression curve and the other is the decompression curve.

 

Parameter definition

 

W₀ Gasket line load when the specified leakage rate is reached during compression,N/mm; 


C₀ The amount of compression when the specified leakage rate is reached during the compression process,mm;

 

S₀=S₁,Specify the required leakage rate;

 

W₂ Set gasket line load,N/mm;

 

S  Leak rate when the specified amount of compression is reached;

 

C₂ The required amount of compression,mm;

 

WmlGasket line load when the specified leakage rate is reached during the decompression process,N/mm;

 

C₁  The amount of compression when the specified leak rate is reached during the decompression process,mm;

 

 

 

 

 

 

 

 

The inherent ability of the sealing ring

 

A characteristic of spring-strengthened metal sealing ring is called inherent ability, which reflects its ability to balance internal pressure and relaxation through its own elasticity at a given temperature. The characteristic symbol is represented by Pu, and the unit is N/mm². The figure below reflects the influence of temperature on Pu. In the figure, Pu and Put respectively represent the Pu values at 20°C and operating temperature T, and the following table lists these inherent capacity values of spring-strengthened metal sealing rings. ...
...
According to the value in the table, the compressive load Wm2=W₂XP/Pᵤ, N/mm required for the seal ring to seal the internal pressure at room temperature can be obtained; where P is the operating pressure or test pressure; then the seal is sealed at the operating temperature The compressive load on the unit seal length required by the internal pressure Wm2T=W₂XP/Put. N/mm; and the P/Pᵤ or P/PUT<1 in the formula. Therefore, the material and the thickness of the sealing ring can be adjusted according to the pressure and temperature during the design. Make a match.

 

Inherent capacity value of sealing ring (ammonia)
Section diameterd mm aluminum N/mm silver N/mm copper N/mm
Pᵤ 20°C Put200°C Pᵤ 20°C Put250°C Pᵤ 20°C Put300°C
1.7 52 N/A 66 N/A 52 10
2.6 56 6 76 8 60 16
3.8 58 16 100 25 72 28
5.6 66 24 140 42 90 35
8 71 30 174 62 104 45

 

 

 

Inherent capacity value of sealing ring (ammonia)
Section diameter d mm Line, Monel N/mm Stainless steel, wire alloy N/mm
Pᵤ 20°C Put 350°C Pᵤ 20°C Put400°C
1.7 72 10 90 24
2.6 84 26 98 30
3.8 94 40 104 40
5.6 114 60 120 48
8 135 74 132 56

Seal pre-tightening force

 

Parameter definition

F  Total bolt load applied,N;    

Fc The total load when the seal ring is pre-tightened to the specified amount of compression,N;    

F0 The total load applied to the bolt to maintain the seal during operation,N;    

Fp Total axial load generated by internal pressure,N;    

Dr Diameter of the contact position of the sealing ring,mm;    

Fm Minimum total load to maintain the seal during operation,N;    

Eb Young's modulus of bolt material at 20°C,N/mm²;    

EbtYoung's modulus of bolt material at operating temperature,N/mm²;    

Calculation formula   
    
When F₀ × Eb/Ebt> Fc, then F=F₀ × Eb/Ebt  

When F₀ × Eb/Ebt <Fc, then F=Fc

in  

Fc=∏DrW₂,N;    

F0=Fm+FP, N; When PDr≥32Wm, Fc should be used instead of Fm, then F0=FC+FP;

FP=Dr2Wm × ∏/4,N;       

Fm=∏DrWm, N; Wm is the larger value of Wm1 and Wm2;   


    In order to achieve the best sealing effect, the following provides a table of the linear load characteristics of the spring-strengthened metal sealing ring. When designing the sealing joint, the designer will match according to the recommended values in the table, and consider the relaxation, pressure, vibration and impact of the bolt under high temperature to retain an appropriate safety factor.

 

Linear load characteristic value table (chlorine gas)

Section diameter
d(mm)

Inner diameter D
(mm)

Groove depth
(mm)

aluminum N/mm

Silver, copper N/mm

Nickel, Monel N/mm

W2

Wm1

W2

Wm1

w2

Wm1

1.7

5-50

1.4

160

20

220

30

250

60

2.6

10〜100

2.1

220

30

250

45

340

70

3.8

25-1500

3

250

35

310

55

490

110

5.6

150-2000

4.5

320

45

390

70

640

150

8

>200

7

340

50

490

90

800

185

10

>200

9

390

60

590

110

-

-

 

Linear load characteristic value table (ammonia)
Section diameter 
d mm
the inside diameter of
D mm
Groove depth
h mm
Stainless steel Nickel alloy
w2 Wml W2 Wml
1.7 5~50 1.4 290 80 350 100
2.6 10-100 2.1 400 100 460 115
3.8 25-1500 3 590 130 690 160
5.6 150-2000 4.5 780 155 900 250
8 >200 7 950 180 1100 340
10 >200 9 - - - -

 

 

the seal groove

 

Parameter definition

C2Is the compression of the sealing ring (ie d-h), mm;
J is the radial clearance between the outer diameter of the sealing ring and the outer wall of the groove,mm;    
A is the outer diameter of the sealing groove,mm;    
C is the inner diameter of the seal groove,mm;    
h is the depth of the seal groove or the thickness of the limit ring,mm;    
d is the cross-sectional diameter of the sealing ring,mm;    
B is the outer diameter of the sealing ring,mm;    
D is the inner diameter of the sealing ring,mm;    
L is the bolt hole diameter,mm;    
G is the bolt center distance,mm;    
E is the inner diameter of the bolt hole,mm;    
F is the pitch diameter of the sealing ring,mm;    
With restriction ring h=d-C2, E=G-L-2   

 

 

 

・Size Chart

 

Section diameter
d mm
Size range
D mm
Groove depth
h mm
Internal pressure p<2Mpa Internal pressure p≥2Mpa Under vacuum
Groove outer diameter A mm Slot inner diameter c mm Groove outer diameter A mm Slot inner diameter c mm Groove outer diameter A mm Slot inner diameter c mm
1.7 5~50 1.4 D+3.9 D-0.7 D+3.7 D-0.9 D+3.6 D-0.8
2.6 10〜100 2.1 D+5.9 D-0.9 D+5.5 D-1.3 D+6.0 D-0.8
3.8 25-1500 3 D+8.6 D-1.4 D+8.1 D-1.9 D+9.0 D-1.0
5.6 150-2000 4.5 D+12.3 D-3.7 D+11.7 D-4.3 D+15.0 D-1.0
8 >200 7 D+17.0 D-7.0 D+16.7 D-7.3 D+23.0 D-1.0
10 >200 9 D+21.0 D-9.0 D+20.7 D-9.3 D+28.0 D-2.0

 

 

・Radial tolerance range

 

Seal ring size range
D (mm)
p<2Mpa p≥2Mpa
f t f t
5〜50 0.15 0.15 0.1 0.1
50-300 0.25 0.25 0.1 0.1
300〜650 0.25 0.25 0.15 0.15
650〜1500 0.5 0.5 0.3 0.3
>1500 0.8 0.6 0.8 0.6

 

 

・Tolerance range of groove depth

 

Section diameter d(mm) 1.5~2.6 27~5.0 5.1~10.0
Tolerance of groove depth h(mm) ±0.06 ±0.10 ±0.13

 

 

・Relationship between media type, surface treatment and seal groove/surface roughness

 

Media type Seal groove/surface roughness (Ra)
Electroplating treatment PTFE treatment No spray
Vacuum and gas (volatile) 0.4 0.8 Not applicable
Water, steam, solution (low viscosity) 0.4 0.8 0.4
Oil, plastic, etc. (high viscosity) 0.8 1.6 0.8

 

・Relationship between coating material and seal groove/surface roughness

 

Material aluminum Silver, copper Fetter Stainless steel Fetter Alloy
Seal groove/surface roughness (Ra) 0.8 0.4 0.2 0.2 Coating

 

 

・Three-sided seal

 

Parameter definition

a is the angle of the sealing slope,° ;

J is the radial distance between the shaft and the sealing slope,mm;

h is the radial distance of the inclined plane,mm;

E is the outer diameter of the shaft,mm;

A is the inner diameter of the sealing ring,mm;

e is the axial compression,mm;

W2' is the axial linear stress,N/mm;

d is the cross-sectional diameter of the sealing ring,mm;

C2 is the specified axial compression of the sealing ring,mm;

 

 

 

・Radial tolerance range

 

size Shaft outer diameter E Seal ring inner diameter A
tolerance +0, -0.05 +0.05,-0

 

 

・Coefficient value

 

Coefficient a=30° A=45°
m 2 1.4
n 0.9 1.2

 

 

·calculate

 

W2'=nW2     E=A     J=d/10     e=mC2

 

 

・Sealing criteria

 

The sealing leakage rate of the spring-strengthened metal sealing ring is designed by a series of flanges, bolts, sealing surfaces, surface treatments, etc., after the relevant test process, the required sealing goal is finally achieved. 

Nitrogen leakage rate: the sealing leakage rate does not exceed 1×lO⁻⁹std.cc/sec, the temperature is normal temperature, and the medium pressure is 1bar;

Other requirements: due to different working conditions, other related tests can be carried out after confirmation with the manufacturer;

 

・Sealing ring selection

 

The spring-strengthened metal sealing ring is not only suitable for special structures and non-standard flanges, but also suitable for a variety of standard flange structures, such as ASMEB16.5, EN1092 flanges, and its structure can be raised, concave and convex, full plane, Tongue and groove surface. Its temperature resistance, aging resistance and corrosion resistance make it a substitute for rubber O-rings. Compared with metal spiral wound gaskets, toothed gaskets, metal sheathed gaskets, etc., it has better sealing performance And compensatory.

 

 

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