Why can’t the metal wound gaskets specified by HG standards be used with wafer-type butterfly valves?
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Why can’t metal wound gaskets of HG20610 be used with wafer-type butterfly valves? The outer diameter of the gasket is larger than that of the butterfly valve, preventing the bolts from being installed.
Was the pressure rating mistaken?
Check whether the pressure rating of the butterfly valve is the same as that of the gasket The pressure rating of butterfly valves is often based on European standards, such as 1.6 MPa or 2.5 MPa
““The outer diameter of the gasket is too large; the bolts cannot be installed.” This is due to a mismatch between the flange, the gasket, and the bolts, and it has nothing to do with the valve.
Gaskets above DN700 are divided into Type A and Type B.
The pressure rating system for the butterfly valve must be consistent with that of the gasket; for example, if the American standard CL150 is used, then both the butterfly valve and the gasket should use the American standard CL150.
HG/T20610 belongs to the European standard series, right~~~~~ I’ve encountered this issue before; the manufacturer supplied flanged valve bodies rated for 16 kilograms, when what was required was ones rated for 10 kilograms. However, the flanges were purchased by the client, which resulted in a mismatch between the components. Another time, the client ordered PL-type flanges, while the manufacturer wanted to use SO-type flanges, leading to another misunderstanding.............. There have been many problems with compatibility regarding wafer butterfly valves~~~~~ @User on floor 5, what you mentioned refers to the American standard~~~~~~~~~