What are the differences and connections between the classification of check valves in Baidu Baike and that in API 594?
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Baidu states that, in terms of structural classification, check valves can be divided into lift-type, swing-type, and butterfly-type check valves. According to API 594, they are classified as flanged, lug, wafer, and butt-welding types – that is, slip-on, lug-type, wafer-type, and butt-welded types. I would like to know what the differences and connections are between Baidu’s classification system and API’s classification system. Please advise me. O(∩_∩)O Thank you
1. Lift-type is the same in all cases. 2. Swing-type has a single valve disc. 3. Butterfly-type has multiple valve discs. The above refers to the internal components； \"Flanged\" refers to a end face that is in the form of a flange, while \"Lug\" means that the bolt holes on the valve flange are of the lug type, i.e., they serve as positioning holes ； A wafer refers to a wafer-type valve, which allows for the elimination of the end flange on the valve body
Does that mean that each of the three types of check valves – lift type, swing type, and butterfly type – can be further divided into four subtypes: wafer type, lug type, wafer type, and weld-on type? Are there 12 in total?
The first is the structure, and the second is the connection method. The classification methods are different
Yes, one is classification by structure and the other is classification by connection method. Apart from lift-type check valves, there is no wafer-type version; the others can be combined in any way