Introduction to soda-based special check valves
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I. Overview
The soda-based special check valve has beautiful appearance and reasonable structural design. The valve flap of the check valve is opened under the action of fluid pressure.
To the exit side. When the inlet side pressure is lower than the outlet side pressure, the valve flap is in the condition of resetting the torsion spring, fluid pressure difference and its own gravity.
Turn it off to prevent the media from flowing backwards.
Second, use
Soda-only special check valve is suitable for nominal pressure PN1.0~4.0MPa , nominal diameter DN50~1200mm (NPS2~48) , work
Prevents backflow of media on various lines from 196 to 540 °C . Available in different valve materials for carbon dioxide, MI , MI
AII , semi- II , nitric acid, acetic acid, strong oxidizing medium and urea and other special media.
Tip: When using carbon dioxide medium, the carbon dioxide temperature control should not be too high, because the dust in the carbon dioxide gas is easy to enter.
The gap causes the flap to become stuck. According to the long-term experience of the soda ash industry, it is recommended to control the carbon dioxide temperature at 80~100 °C because
If the carbon control temperature is too high, it will easily cause the screw compressor to malfunction.
Third, the structural characteristics
1 . The structure length is short, and its structural length is only 1/4~1/8 of the traditional flange type check valve ;
2 . Small in size and light in weight, its weight is only 1/4~1/20 of the traditional flange type check valve ;
3 . The valve flap is closed more quickly and sensitively under the action of the reset torsion spring, and the water hammer pressure is small;
4 . Both horizontal and vertical pipes can be used for easy installation;
5 . The flow path is unobstructed and the fluid resistance is small;
6 . The disc hole and the valve shaft are designed with a reasonable transitional rotation gap, which increases the sensitivity and sealing of the valve flap when opening and closing;
7 . The valve flap angular stroke is rotated, and the closing impact force is small;
8 . The overall structure is simple and compact, and the shape is beautiful;
9 . There is a blowing device, and the dust inside the valve cavity (crystallization, crusting, scaling) can be periodically purged with high pressure steam;
10 . Long service life and high reliability.
Four: common accidents and elimination methods:
Leakage at the joint: The nut of the connecting bolt is not tight or the uneven gasket is damaged. Eliminate the method to evenly tighten the bolt, remove dirt, and replace the gasket.
Seal leakage: Cause There is dust, crystallization, crusting and scaling on the sealing surface. The elimination method is connected to the blowing device, and the valve sealing surface can be periodically purged with high pressure steam.