Relive the stainless steel gate valve plate and valve body structure

by:AIRWOLF     2020-05-21
Revisit stainless steel stainless steel gate valve gate valve plate and valve body structure is the modern industry one of the most widely used type of valve of all kinds. This type of valve, the valve body like gate plate content in matching two seat between vertical and fluid movement, so as to open or cut off the flow. Use it as a globe, and the whole flow when fully open, the medium run minimal pressure loss. Know the stainless steel gate valve gate: wedge single ram: simple structure more flexible gate valve; At higher temperatures, sealed performance is not as good as elastic slide valve or double gate valve; Suitable for easy coking of high temperature medium. Flexible disc: wedge special form of single ram. When compared with wedge gate valve, high temperature, good sealing performance, when heated and ram is not easy to get stuck; Applicable to steam and oil, oil and gas in high temperature medium, and is suitable for frequent switch parts. Should not be used for easy coked medium. Double ram: sealed performance is good wedge gate valve, such as sealing surface Angle and cooperate to be not very accurate seat, still has good sealing; After disc sealing surface wear, the spherical centers at the bottom of the metal pad can be used for thicker, generally don't have to be surfacing welding and grinding seal face, this single ram, flexible disc hard; Parts more than other forms of gate valve; In addition to the applicable to steam, oil and other media, also applies to switch parts and frequently on the sealing surface wear medium, should not be used for easy coked medium. Stainless steel gate valve can be divided into the full size of the duct flow in a valve body type 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. By reducing flow channel, 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.
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