Questions about the unloading bottom valve of the reactor
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I wonder if the bottom valves of the kettles in your factories all use downward expansion or upward expansion type bottom valves? The bottom valves of the reaction kettles in our factory all use this mechanism, which may be related to the materials in our factory. The materials are powder, which reflects that they are still in a slurry state at the initial stage. Therefore, considering that there is a dead corner in the ball valve unloading process and requires manual control, the piston-type downward expansion valve can be controlled by a solenoid valve. However, there are still some problems during the use of our unloading bottom valve. If it is used for a long time and the material solidifies and accumulates, the valve stem cannot move, and the bottom valve needs to be disassembled, inspected and cleaned.
For the bottom discharge valve of the reaction kettle containing powder materials, we choose an upward-expanding bottom valve.
When selecting equipment recently, we also considered the problem of reaction tank bottom valves. Because it is a high value-added product, we are very concerned about the accumulation of material at the bottom of the tank. After looking at several types of valves, we found that there is basically no accumulation of material in the tank bottom valve. However, the valve needs to be welded to the bottom of the tank, which may not be very convenient for future maintenance. There is still a short distance between the upward-expanding discharge valve and the tank. I have never used a non-retention ball valve, so I don’t know if it is suitable. There is also a plunger valve that I don’t know if it will work. Friends who know it can explain it, thank you.
It should be easier to use the upward-expanding type.
The upward-expanding discharge valve and the kettle body can be connected by directly welding the flange flange at the bottom of the reactor instead of using a short pipe.； But at this time, you need to calculate the height of the discharging valve core entering the kettle when it expands, and be careful not to collide with the stirring shaft head. For reference!
If the equipment is a glass-lined reactor, it is more appropriate to use an upward expansion valve. If it is made of other materials, the bottom ball valve can be installed directly on the reactor to reduce aggregates.
Using an upward expansion valve, to solve the problem raised by the poster, the structure of the valve core can be changed. The total length of the valve core is not shorter than the length of the outlet nipple. The top of the valve core is cylindrical, the lower part (sealing part) is changed to a cone, and a small cylindrical transition is used in the middle. In order to reduce weight, it can be processed into a hollow one. After the change, it has a good effect in avoiding clogging of impurities and debris. When it comes to solidification and accumulation, the upward expansion valve may not solve the problem. It is recommended that the equipment should be jacketed to perform necessary heating and insulation.
An upward-expanding discharge valve should be selected. Considering the particularity of materials and processes, special designs can be made by communicating with the valve manufacturer.
The upward-expanding kettle bottom valve and tank bottom valve can achieve no dead zone! German Ritag fully forged kettle bottom valve, you can learn more about it. If you need information, please contact 379662240@qq.com