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Gate valve body structure knowledge introduction
Source: | Author:zhongdeen | Publish time: 2015-08-22 | 1406 Views | Share:
Gate valve body structure of the decision and the valve and pipe, valve body and bonnet connections, in terms of manufacturing methods, casting, forging, forging, welding, cast joint and tube sheet welding, etc. Forging the body has to develop in the direction of large diameter, and casting the body gradually to the development of small diameter. Any kind of gate valve can be forged, cast, should be based on user requirements and the manufacturer with manufacturing methods.

Port can be divided into the valve body, full size and reducing type two kinds. Runner diameter and nominal valve menstruation and basically the same for all sizes, Circulation pore size smaller than nominal valve is given.it is called reducing type. Reducing uniformly reducing evenly and reducing costs are two kinds. Flow in cone tube is a kind of non-uniform shrinkage, this kind of valve inlet side aperture is basically the same as the nominal diameter, then gradually narrowed, to seat down to a minimum.

With reducing type port (whether cone tube non-uniform shrinkage or even reducing), its advantage is the same specifications of the valve, can reduce the size of the ram, opening and closing force and moment; The disadvantage is that flow resistance increases, the pressure drop and increase energy consumption, so the shrinkage cavity shoulds not be too big. For cone tube reducing, the seat of the ratio of the diameter and nominal diameter, usually take 0.8 ~ 0.95. Nominal diameter less than 250 mm of the reducing valve, the valve seat diameter than nominal diameter reduce a commonly; Nominal diameter equal to or greater than 300 mm of reducing valve, the valve seat diameter is generally lower leg than the nominal size.