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Flange Bolting Washers

Flange Bolting Washers are the heat and corrosion resistant washers that compensate loosing of pre-tightening  force between flange and bolt with the property “small deformation, huge compensation force”. The washers are designed to provide added holding power in the absence of a flat washer, essentially taking its place. One of the most popular uses is in pipefitting and plumbing. Comparing with bellevilles, flange bolting washers last longer life and will reduce the amount of maintenance required.
 
Specifications
H13
•Customizing off-standard flange bolting washers, especially the tickening. Please contact us.
 
 
Why the pre-tightening force goes to loose?
expanding with heat and contracting with cold
increasing or decreasing of the pressure,then the flange and gasket will be out of shape 
shocking of the equipments.
 
If we install the washers between flange and bolt, it will be like this:
 
Application Equipments
Reactors
Heat Exchangers
High temperature Valves
High temperature Pumps
 
Application Industries 
petroleum chemicals, electrical industry, metallurgy, paper-making, medical industry, food industry.