Application Characteristics of Groove Gate Valve and Flange Gate Valve
Publisher：Botou Valve
The application characteristics of groove gate valve and flange gate valve are basically the same, but the connection mode is different.
The groove gate valve is only connected by a clamp, and the other performances are the same as those of flange gate valve, which can be seen from the above.
The outlet connection mode can not determine the quality of the valve, but the price of the groove gate valve is incomparable with that of the flange gate valve.
At least a third of the cost has been reduced, making it the preferred choice for many customers nowadays.
Flanges of different forms require different gaskets. Smooth flanges are generally used only for low pressure, with soft thin seals.
Pad; at high pressure, if the flange is strong enough, it can also be used with smooth flange, but should be thick soft pad, or with a flat flange.
Winding gaskets with in-band reinforcing rings or reinforcing rings. In this case, metal gaskets are not applicable, as required at this time.
Excessive compression force leads to large deformation of bolts, which makes flanges difficult to seal. If metal gaskets are to be used, smooth surfaces should be made.
Reduce the contact area between the bolt and the gasket. Thus, under the same bolt tension, the narrow smooth surface will be reduced.
The compressive stress will increase.
The influence of flange surface roughness. Flange surface roughness has a great influence on sealing effect, especially when non-soft cushion is used.
One of the main reasons for leakage is the high degree of roughness of sealing surface. For example, the cutter grain of turning flange surface is
Helix, when using metal gaskets, if the roughness value is large, gaskets can not block the helix formed by knife lines.
Under the action of pressure, the medium will leak out along the groove.
Soft gaskets require much less polish on flange surfaces because they are easily deformed and can block machined knives.
For soft gaskets, the flange surface is too smooth, but not good, because the interface leakage resistance occurs at this time.
The force decreases. Therefore, different gaskets require different surface roughness of flanges.
The selection principle of the sealing pad of the soft sealing gate valve is that in the case of low requirement, it can be selected by experience and not timely.
Replacement. But for those demanding situations, such as explosive, highly toxic and combustible gases, and highly corrosive liquid equipment,
Reaction tank and conveying pipeline system should be based on working pressure, working temperature, corrosiveness of sealing medium and tight combination.
Cover form to choose.
Generally speaking, in normal temperature and low pressure, choose non-metallic soft gasket; in medium pressure and high temperature, choose metal and non-metal combination.
Gaskets or metal gaskets; when temperature and pressure fluctuate greatly, choose elastic or self-tightening gaskets; at low temperatures
Gaskets with special properties should be considered under temperature, corrosive media or vacuum conditions. Flanges are to be specified here.
The influence of condition on gasket selection.
Next：How to Select and Replace the Seal Ring of Soft Sealed Gate Valve
