Seeking advice on the selection of powder valves!
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A powder metering bin requires a valve; when a certain amount of material has been discharged, the metering system sends a signal to close the valve. Question: Is it appropriate to use a pneumatic slide valve or a star-type ash discharge valve? The temperature of the powder is relatively high: around 80~90 degrees. Thank you!
I have encountered this situation many times on site, and I even wrote an article about it; those interested can check it out on my blog at blog.designnews.com.cn. In my humble opinion, if the powder is very fine, a knife-type gate valve can be used. :handshake
Special ball valves with metal seals using cross-shaped spheres! These valves are designed specifically for this purpose.
The pneumatic slide valve is on top, and the star-shaped ash discharge valve is at the bottom. The pneumatic slide valve serves as the control switch, while the star-shaped ash discharge valve is used for speed regulation.
Pneumatic slide valves work fine; it depends on how strict the requirements are.
Pneumatic slide valves can be used; if air-tightness is required, pneumatic ball valves can also be chosen.
It is recommended to use star-type ash discharge valves, as they provide better accuracy in measurement compared to plug valves.
It depends on what materials you use; everything is clearly stated for ordinary materials. For materials that are of higher quality and more abrasive, use dome valves, disc valves, or knife valves; it is best to use two such valves – one to prevent air from entering and another to prevent material from leaking out. I can provide you with the relevant valve information. Our project has tested many different types of valves, and we have learned through trial and error. .
A rotary valve can be used for quantitative discharge, driven by a motor.
Personal opinion: It is best to choose a knife gate valve.
I think a pneumatic slide valve would be more suitable; we have many successful experiences in this area.