The sealing ring is two pieces of large flanges are mutually connected, put in two pieces of flange sealing surface of the two and then tightened the bolt flange, the flange leakage of a product does not occur. In the large flange sealing ring to facilitate change when the seals need to be replaced, without dismantling the valve flap, just next to the flange valve fully open, then the took out the installation and operation of the key, after the operation mounted to the closed form still adhere to and the main valve linkage, then headed for open partial to the continued migration shift handwheel until the sealing ring is located in the valve body, sealing face seal side can be changed.
Sealing ring of large flange in reverse bias stress task action, occurred from the sealing force, the sealing pressure to add, seal compression valve seat ring and reverse bias greater work pressure, self sealing force greater, so that sealing ring and the valve seat joint strict, reach the two-way sealing effect.
In high pressure equipment and piping, adopt metal gasket lens type copper, aluminum, steel, 10 stainless steel or other shapes. High pressure gasket and sealing surface of the contact width is very narrow (line contact), high brightness light processing and gasket sealing surface.
The flange (wire) connection points thread flange and welding flange. Low voltage and small diameter wire flange, high pressure and low pressure large diameter is used welding flange, different pressure thickness and cohesion bolt flange diameter and number is different.
Grade according to pressure differences, there are differences between the flange gasket material, from the low pressure high pressure asbestos asbestos pad, pad to the metal pads are. The classified material of carbon steel, cast steel, alloy steel, stainless steel, copper, plastic, Aluminum Alloy, argon Ge Lek, PPC etc.. The manufacturing method can be pided into pushing, forging, forging, depressed. As long as the common welded flange flange ring, usually take steel manufacturing needs can be taken when rolling forging. In the convergence directly linked with the cylinder head or fillet welding.
Large flange sealing valve rigid good, is not easy to deform DN300 more than the butterfly valve for the double plate truss flow structure, small flow resistance, good rigidity, in reverse bias stress task and not easy to deform, sealing ring can not follow the valve deformation and leave the seat the best seal point, thus ensuring the sealing ring for sealing.
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