What is a metal spiral wound gasket

What is a metal spiral wound gasket?

metal spiral wound gasket is a kind of gasket which is widely used at present. It is the gasket with the best resilience in the semi-metal gasket. It is made of V-shaped or W-shaped thin steel strip and various fillers. High temperature, high pressure and adapt to the conditions of ultra-low temperature or vacuum. By changing the material combination of the gasket, the chemical corrosion of the gasket can be solved by various media. The structural density can be made according to the different locking force requirements. The main body and the accurate positioning, the winding gasket is provided with a metal inner reinforcing ring and an outer positioning ring, and the inner and outer steel rings are used to control the maximum pressing degree, and the surface precision of the flange sealing surface contacting the gasket is not high.
metal spiral wound gasket Description: metal spiral wound gaskets are made of high quality SUS304, SUS316 (“V” or “W”) metal strips and other alloy materials alternate with soft materials such as graphite, asbestos, PTFE, and non-asbestos. The spiral is wound up and the metal strip is fixed by spot welding at the beginning and the end.
The metal spiral wound gasket is the best resilience gasket in the semi-metal gasket. The structural density of the metal spiral wound gasket can be made according to different locking force requirements, and the inner and outer steel rings are used to control the maximum compression and winding. The surface accuracy of the flange sealing surface of the gasket contact is not high.
metal spiral wound gaskets are especially suitable for applications where load is uneven, joint force is easy to relax, temperature and pressure change periodically, and there is shock or vibration. The wound gasket is a static seal original for the flange connection of valves, pumps, heat exchangers, towers, manholes, hand holes, etc.
Wound gasket application range: sealing of flanges, valves, pressure vessels, condensers, heat exchangers, towers, manholes, hand holes, etc. in petroleum, chemical, metallurgy, electric power, shipbuilding, machinery and other industries.
The winding sheet gasket is divided into four types: basic type wound gasket (G2121), inner ring type wound gasket (G2122), outer ring type wound gasket (G2123), and inner and outer ring type wound gasket (G2124). .

Types of metal spiral wound gaskets:

Types

Thickness(mm)

Basic type(G2121)spiral wound gasket

3.2

4.5

Inner ring(G2122)spiral wound gasket

4.5

Outer ring(G2123)spiral wound gasket

4.5

With inner and outer rings(G2124)spiral wound gasket

4.5

Structural material of metal wound gasket:

Filler

Steel strip

Inner ring

Outer ring

Asbestos winding

SUS 304

Carbon steel

碳钢

Graphite winding

SUS 316

SUS 304

SUS 304

PTFE winding

SUS 316L

SUS 316

SUS 316

SUS 316L

SUS 316L

Filler

Temperature(°C)

Maximum operating pressure (kg/cm2)

Graphite winding

     -200~550

              250

Asbestos winding

-150~450

100

PTFE winding

240~260

100

The following table is used to select the material for the inner ring and the wound metal:

Product name

AISI

Hardness(HB/HV)

Temperature(°C)

304

304

130~180

-250~+550

316

316

130~180

-100~+550

316L

316L

130~190

-100~+550

The outer ring usually consists of carbon steel that has been treated with corrosion protection.

Flange type and winding gasket form:

Types of flanges

Shapes of spiral wound gasket

Flat flange

Only outer ring wound gasket

Inner and outer ring wound gasket

Convex flange

Only outer ring wound gasket

Inner and outer ring wound gasket

Bump flange

Basic winding gasket

Only inner ring wound gasket

Slot flange

Basic winding gasket

Only inner ring wound gasket

Plane and groove flange

Basic winding gasket

Only inner ring spiral wound gasket

 Wound gasket thickness tolerance:

Project

Thickness(mm)

Tolerance(mm)

Gasket thickness

4.5, 3.2

+0.2-0.1

Ring thickness

3.0

±0.24

The following table shows the diameter tolerance of the metal spiral wound gasket (ie the nominal pipe diameter for the flange):

DIN (mm)

ANSI B16.5 BS1560 (mm)Mss sp-44

API 605

Tolerance

Inner ring inner diameter gasket inner diameter

<=600

<=24″

>=26″ and <=34″

±0.5

>600 and <=800

>24″ and <=34″

>=36″ and <=60″

±0.9

>800 and <=1600

>34″ and <=60″

±1.3

>1600

>60″

±1.6

Gasket outer diameter

<=600

<=24″

<=24″

±0.9

>600 and <=160000

>24″ and <=60″

>24″ and <=60″

±1.8

1600

>60″

±2.2

Outer ring outer diameter

>=1/2″ and <=60″

±0.9

<=600

<=24″

0-1.0

>600 and <=1000

>24″ and <=34″

0-1.8

>1000 and <=1600

>34″ and <=60″

0-2.2

Note: In addition, we can also produce according to JIS, JPI standard or customer requirements.

Main technical parameters of metal wound gasket:

Winding gasket coefficient

m=2.5-4

Wound gasket pressure

≤25MPa

Wound gasket use temperature

-196℃-700℃(Not more than 600 ° C in oxidizing medium)

Minimum preload ratio of wound gasket

y=68MPa

※ The actual application conditions are different. The above parameters are for reference only and do not require any guarantee.

Source: China Spiral Wound Gaskets Manufacturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

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