Method for manufacturing stainless steel sealing ring of double eccentric butterfly valve plate

Abstract

The invention greatly technically improves a method for manufacturing a stainless steel sealing ring of a double eccentric butterfly valve plate. In the prior art, the sealing ring which forms a double eccentric butterfly valve sealing pair is generally made from metal materials such as copper or stainless steel and the like, and is fixed on a boss lug of the vale plate by bolts, in order to prevent a joint surface between the sealing ring and the valve plate from leaking to lead the sealing to be invalid, a sealing gasket have to be installed; and the copper or the stainless steel is directlywelded on the external ring of the vale plate and is machined in a cutting way, thereby causing great waste. The method changes the traditional manufacture method that the metal seal ring on the valve plate is cut from thicker big metal plant material into ring shaped, is machined in a cutting way, and is located and fixed by the bolts or piled; and adopts thinner stainless steel plate material to be cut into long strips, rolled and pressed, welt, shaped, pressed and sleeved, cut and reinforced on the outer ring of the vale plate. By using the manufacture method, the stainless steel sealing ring of the vale plate has less material, low machining cost, flat and smooth sealing surface, corrosion resistance, wear resistance, leakage resistance, never falling off and long service life.

Description

technical field [0001] The invention relates to a valve component manufacturing technology, in particular to a manufacturing method for a sealing ring made of stainless steel plate and fixed on the outer circle of a double eccentric butterfly valve plate. Background technique [0002] The traditional butterfly valve, especially the double eccentric butterfly valve, has a valve seat and a valve plate that rotates around the eccentric shaft of the valve plate in the valve body, and a sealing pair is provided between the valve seat and the valve plate. The sealing pair is composed of a sealing rubber ring installed on the valve seat and a metal sealing ring arranged on the outer circle of the valve plate. In the prior art, the valve plate seal rings of some butterfly valves are metal seal rings made of copper or stainless steel. The metal sealing ring is usually positioned on the boss on the edge of the valve plate, and the outer diameter of the valve plate boss and the inner ...

AI Technical Summary

Problems solved by technology

The sealing ring of this kind of valve plate should be prefabricated before installation. Usually, a ring is cut from a whole piece of thicker steel plate, and then cut by a lathe, so the material waste is large, the processing cost is high, and the sealing performance is not good. Not ideal, the overall cost of the product is therefore higher

There are also technologies that use copper or stainless steel welding materials to weld directly on the outer circle of the valve plate by surfacing welding, and then perform cutting processing. This surfacing welding technology consumes more materials and has a large processing allowance, so the processing cost is unavoidable. higher

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