Industry News

Metal spiral wound gasket

2020-06-23
Metal spiral wound gasket is a kind of semi-metal flat gasket made by spirally winding metal belt and nonmetal belt.

① The characteristics of the metal spiral wound gasket are:
Good compression and resilience performance;
It has multiple seals and a certain self-tightening function;
It is not very sensitive to the surface defects of the flange pressing surface, and the flange sealing surface is not bonded, so it is easy to align, so it is easy to disassemble;
It can partially eliminate the influence of pressure, temperature change and mechanical vibration;

It can maintain its excellent sealing performance under various harsh conditions such as high temperature, low pressure, high vacuum, shock and vibration.


② Form

Spiral wound gaskets can be divided into four types according to their different structures: basic type, inner ring type, band set ring type, band inner ring and ring type.


③ Gasket type code (GB/T4622.1-2003)


④ Marking-Marking example
With inner ring and set to ring type:
It is assumed that the ring material is low carbon steel and the metal strip material is 0Cr18Ni9;
Nominal diameter 150mm;
Nominal pressure 4.0MPa (40bar);
Gasket size standard GB/T4622.2-2003;
It is marked as:
Winding mat D 1222-DN150-PN40 GB/T4622.2

Basic type:
The material of the metal strip is 0Cr18Ni9, and the material of the filling strip is flexible graphite;
Nominal diameter 150mm;
Nominal pressure 4.0MPa (40bar);
Gasket size standard GB/T4622.2-2003;
It is marked as:
Winding mat A 0220-DN150-PN40 GB/T4622.2

⑤Selection and use method of spiral wound gasket:
a, the basic gasket is suitable for tongue and groove flange
b. The inner ring gasket is suitable for concave and convex flanges
c. The ring gasket is suitable for flat and raised flanges
d. The inner ring and the ring-shaped gasket are suitable for flat and raised flanges