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Bonnet Seal Ring

Bonnet Seal Ring

1.Valve bonnet seal ring is the type of mechanical compression, that is to say it is sealed only by the tightening torque of flanged bolt.
2.Valve bonnet seal ring is used in 6B flanges with standard flanged connections, it has the face seal with good seal performance, but it should have high accuracy.
3.Valve bonnet seal ring can be reused in the field in the case of the appearance with no damage.
4.The hardness of valve bonnet seal ring must be15~20HB lower than the mating flange face hardness.
5.The seal faces of valve bonnet seal ring, including the bevel faces, shouldn't have the scratches, knock marks, cracks and defects. Its surface roughness shouldn't be larger than Ra1.6.


Performance Parameters

gasket factor


gasket using pressure


gasket using temperature


minimum pre-tightening pressure



Soft Iron,Low C/S,ss410,ss304,ss316,ss347,F5,F11,Copper,Aluminum,Inconel 600,Inconel 625,Incoloy 800,Incoloy 825,Monel 400,Titanium,Nikel 200,Hastelloy C276,Zirconium702


The gaskets are primarily used in the oil, gas, petrochemical and offshore industries. They are also commonly used on valves, pipe-work assemblies and vessel joints and are used to seal flanged connections subject to high pressures and temperatures.

Technical Standards

It can provide any standard and non-standard sizes, including the standards of API 6A, API 17D, ASME B16.20, DIN 2693-67, JPI-7S-23-72 and other standards.

The circular ring joint bonnet seal has proven to be the best bolted high pressure bonnet joint available.

More informations, please click the "PDF" download or contact with us.
Click here to download the Jayu Bonnet Seal Ring product guide pdf.

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