Dust Collection and Valves Blog

5 Ways to Go Green in Dust Collection | Aerodyne

Posted by Tom Hobson on Sep 29, 2022 3:00:00 PM


  1. Use pulse-on-demand controller for baghouse and cartridge collectors

    Pulse-on-demand controllers allow you to clean your filter less often. Less pulses helps you save compressed air and reduces wear and tear on the filters. Cutting down on compressed air means less electricity is required in the compressors and less wear and tear on the filter means they last longer.
  2. Install a cyclone pre-filter

    A cyclone pre-filter will help remove dust before it gets to your filters. This means that the dust loading on the filters will decrease, which helps extend their life by requiring less cleaning and plugging them up less. The cyclone can also allow you to recycle the material without contamination and possibly increase the total removal efficiency of the system.
  3. Monitor airflow in the dust collection system

    Dust collection systems are designed to capture dust and they should be operating at design specifications. By monitoring the airflow, you are confirming that the unit is operating correctly. If the airflow is off from its design condition, then you will not be capturing the material that it was designed to capture. Measuring the airflow is similar to measuring the temperature in an oven. Without measuring it, you won’t know if you are at the correct performance and the end result may be off.
  4. Install Aerodyne Vacu-Valve (if appropriate)

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Topics: Cyclone Pre-Filter, vacu-valve, cleaning baghouse filter, pulse-on-demand controller

Air Leakage in Airlocks | Aerodyne

Posted by Tom Hobson on Dec 17, 2021 11:00:13 AM

Airlocks are required in order for dust collectors to operate correctly. When a dust collector is under positive pressure, the airlock prevents air and collected material from blowing out of the dust discharge flange. A lack of airlock will cause dust to be thrown into surrounding areas and pile up on the floor and other surfaces.

When a dust collector is under vacuum, an airlock prevents air from entering the dust collector from the dust discharge flange. If no airlock is installed, air will leak in through the dust discharge, re-entraining material from the hopper while lowering the airflow at the pickup points.

Which Type of Airlock You might Use

Every airlock will leak a certain amount of air into or out of the hopper depending on the conditions the hopper is under. Depending on your application, the amount of acceptable leakage might determine the type of airlock you use.

A knife gate has the greatest amount of leakage, because when the knife gate is open, there is no airlock, only when you close the knife gate will you achieve an airlock.

A rotary valve provides a good, steady airlock but in order for the rotor to turn, there must be a gap between the rotor and the housing. This gap allows air to constantly leak past the rotor. The rotary valve also will allow air pass if the pockets in the rotor are not fully filled with material.

The double dump valve provides one of the lowest leakage rates of an airlock. The double dump valve is similar to having two (2) knife gates in series. This creates a chamber between the two flap plates. At all times one of the flap plates is closed, so the total leakage in the double dump valve is the volume of the chamber minus the volume of the material in the chamber.

Aerodyne’s Vacu-Valve

Aerodyne also produces a Vacu-Valve, which provides low leakage. The Vacu-Valve can only be used on applications with a slight vacuum and must have material that is fine and free-flowing (doesn’t easily bridge). The Vacu-Valve has an opening that a rubber sleeve is attached to. This sleeve is pulled together by the vacuum in the hopper.

Material then begins to build up above the sleeve. As the material builds up, gravity and the weight of the material slowly trickles the material down through the sleeve and out of the system. This trickle action is dependent on many conditions, including the weight of the material, the amount of vacuum in the system, and the ease of the particles to flow through the sleeve (particle size, stickiness, etc.)

So when selecting an airlock for you dust collector, don’t forget to factor in the air leakage each airlock will allow.


To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.



To improve efficiency and safety, there is no substitute for an on-site inspection by an experienced expert. Click below to start with a free 20-minute phone consultation by clicking the button.

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Topics: knife gate valve, vacu-valve, airlocks valve

Is Your Hygroscopic Dust Causing Issues in Your Dust Collectors?| Aerodyne

Posted by Tom Hobson on Mar 29, 2021 8:45:00 AM

Hygroscopic dust can really grow on your nerves! I know the marketing department might take away my writing duties after that line. But seriously, hygroscopic dust can cause major maintenance issues in your dust collectors. Hygroscopic dust captures water vapor and droplets. This causes the particles to grow in size and weight, thereby making them easier to capture and remove from the airstream. However, if you are using filters, that’s where the problems start.

Filters capture dust in between the filter fibers and on the filter cake. When the dust is hygroscopic this can lead to issues. Dust particles in the filter fibers can grow when exposed to water vapor. They can then not release when cleaned, blocking the air pathway, or if they do release during cleaning the filters could be left deformed, allowing particles through the filter.

When hygroscopic filter cake is exposed to water vapor, it can plug up the filter, preventing air from passing through. This prevents any dust collection from the needed areas because there is no airflow to pull the dust into the system. And during cleaning cycles, the filter cake is strongly adhering to the filter and won’t fall off.

To prevent this from being an issue you will need to identify where the water vapor is coming from.

Airlock

If humidity is leaking in from the airlock then a low leaking airlock would be needed. Rotary valves have a small space surrounding the rotor allowing it to rotate without locking up. This area constantly allows air to leak around. A double dump valve which uses two flaps in series to isolate the hopper or a rotary valve with wipers can cut down on air/humidity leakage into the hopper.

Housing holes

If there are holes in the housing, high humidity outside air can leak in. Replacing or patching the holes will prevent air leakage. If corrosion is an issue, changing materials of construction or coating the hopper might help prevent future issues.

High water content in the compressed air used for cleaning

Install water traps and filters to keep the compressed air used for filter cleaning with low humidity. Often times this can cause greater issues than leaking airlocks or hoppers because the high pressure air goes through the filter, expanding the filter to shake off the dust. This delivers the humidity to the dust collected in the filter, which could cause greater pluggage.

High humidity air coming in with the dust

Installing a pre-filter will remove the majority of the larger heavier particles before they can see the filters. This minimizes the amount of material the filters contact, extending their life. Pre-filters such as cyclones and dropout boxes can often provide additional help on issues above and even extend the life of filters caused by high dust loading.

So when you have hygroscopic dust and your filters are plugging up too fast, try to isolate the area where humidity is coming.


 

To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.


To improve efficiency and safety, there is no substitute for an on-site inspection by an experienced expert. Click below to start with a free 20-minute phone consultation by clicking the button.

Free Consultation

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Topics: dust collector, vacu-valve, airlocks valve, GPC Cyclone, arirflow, hygroscopic dust

Why Are Airlocks Needed? | Aerodyne

Posted by Tom Hobson on Dec 16, 2020 10:00:00 AM

All dry dust collectors have a hopper which temporarily collects the dust while it is moved out of the system. The hopper usually has a flanged outlet on bottom which allows the dust to fall outside of the dust collector vessel. When you are deciding what to put under the hopper it is important to make sure that air doesn’t flow out of or into the opening while still allowing the dust to empty from the hopper. An airlock (discharge valve) is used to prevent this.

An airlock comes in a variety of designs. The most common is the rotary airlock while the simplest design is a trickle valve (Aerodyne Vacu-Valve). What these valves do is prevent the higher pressure air from going to the lower pressure air. Generally dust collectors are designed to be under vacuum. This prevents dust from escaping the vessel and helps protect the exhaust fan from being damaged by dust loading. However, some systems do have pressured dust collectors for operational reasons. Either way it is important that there be some kind of airlock under the hopper.

Dust Collector Under Pressure

A pressurized dust collector will blow air out of the hopper if no airlock is installed on the hopper. This will create a dust cloud around the dust collector. If indoors this will coat the surrounding equipment and become a nuisance to employees in the area. Plus it’s pretty unseemly having a dust collector spewing dust out in a facility.

Dust Collectors Under Vacuum

A system under vacuum, however, is much more impacted by not having an airlock. The airlock prevents outside air from entering the system. So if you don’t have an airlock the exhaust fan will begin pulling air into the system through the hopper. This does two main things. For one, it lowers the airflow at the pickup points that are collecting the dust. Air will flow the easiest path (much like water). So if you have an opening allowing air to enter through the hopper then air will take advantage of this. And since your exhaust fan doesn’t care where the air comes from it will pull much of the air through the hopper. This airflow means that there will be less air coming from the pickup points. This could cause insufficient dust pickup at those points and even dust buildup in the ductwork. The second issue is that any dust collected in the hopper could get re-entrained by the air entering through the hopper outlet and then leave the dust collector. This will decrease the system removal efficiency and could cause violations of permits, increased fan maintenance, etc.

So when you are operating a dust collection system, make sure that the dust discharge flange is installed with an airlock, that way you will have the system operating at its peak efficiency.


How Do Vacu-Valve Dust Valves Work?


To learn more about which dust collector, please contact our experts at 440-543-7400 or visit our website: www.dustcollectorhq.com.


To improve efficiency and safety, there is no substitute for an on-site inspection by an experienced expert. Click below to start with a free 20-minute phone consultation by clicking the button.

Free Consultation

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Topics: vacu-valve, airlocks valve, GPC Cyclone, arirflow

Un-powered Valve Saves Initial Cost and Operating Costs over Rotary Airlock Valve

Posted by Tom Hobson on Dec 13, 2018 9:30:00 AM

Look under almost any dust collector and you will see a rotary airlock valve spinning its rotor and emptying the collected contents from the hopper. These valves have long been used to maintain a seal in vacuum dust collection systems while simultaneously providing an escape route for the dust. The advantages of a rotary airlock for dust collectors include, automatic hopper emptying, minimal vacuum pressure loss, and the many options available to meet specific application needs. Rotary valves can be custom fit to handle high temperatures, harsh chemical environments, and abrasive materials. Rotary valves do however, have a few major drawbacks.

Because rotary airlocks are sealed tight to the atmosphere they can be very difficult to clean. Cleaning a rotary valve often involves removing the drive assembly, end plate, and finally the rotor. This process can take hours to perform. Rotary valves are also expensive to operate. Typically, these valves are left running continuously, even when there is no dust present in the hopper. This not only wastes electricity but puts undo wear on the valve. Repair and replacement parts for rotary airlock valves can be quite costly as well. Even with these shortcomings, the rotary airlock remains the industry standard for most dust discharge applications.

One alternative which has been gaining popularity is a non-powered automatic dust discharge valve. These valves, like the Armadillo and Platypus Vacu-Valves from Aerodyne, rely on the negative pressure (max -18" W.C.) of a dust collector to hold a rubber sleeve closed to maintain an airlock. As the weight of the dust in the hopper builds up, the sleeve is forced open and dust is discharged from the valve. Leaf springs inserted into the valves sleeve also help to counterbalance the vacuum. A video demonstration of how this works is available here. The valves are available with a variety of sleeve materials for different applications. While these valves can not be used in every dust collection system they are a very economical alternative to expensive rotary valves.

The Vacu-Valves from Aerodyne are priced at a fraction of the cost of standard rotary airlock valves and require no electricity to operate. These valves have no controls and require no lubrication. They easily handle abrasive materials that would jam or wear out a rotary valve.

To learn more about which dust collector valve is right for you, please contact our experts at 440-543-7400 or click on the button below to get our infographic, Vacu-Valve is a Simpler Solution.

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Topics: rotary valves, trickle valve, vacu-valve, airlocks valve, airlock, maintaining air valves

Aerodyne At Ceramics Expo 2017

Posted by Tom Hobson on May 25, 2017 4:01:04 PM

Now in its third year, Ceramics Expo is the world's largest annual free-to-attend expo for the advanced ceramic and glass community.

The massively expanded event stands as a unique showcase for all the latest start materials, industrial equipment, technical ceramic components, processing expertise, analysis and testing devices, thermal technologies and precision finishing systems that keep this sector at the forefront of manufacturing advances.

Get Your Line Card

Due to its tightly focused approach and by maintaining a close relationship with all core stakeholders, Ceramics Expo guarantees the participation of respected and innovative suppliers. As the premier US ceramics exhibition, it draws in thousands of genuine decision makers and aims to set the agenda for ceramics manufacturing and applications.

Aerodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or verticaly, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves.

Aerodyne Environmental's industrial dust collection products feature unique, - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
Aerodyne Environmental's industrial dust collection products feature unique, - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
Aerodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or vertically, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves. - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
erodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or vertically, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves. - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
Aerodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or vertically, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves. - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
Aerodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or vertically, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves. - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf
Aerodyne Environmental's industrial dust collection products feature unique, low-maintenance designs that will enhance the performance of your processing operations. Our industrial dust collectors, which work horizontally or vertically, can extend the life of your baghouse or cartridge filters. And, Aerodyne offers a variety of durable material handling valves for every application, including the Vacu-Valve Trickle Valve System, a cost-effective solution to rotary valves. - See more at: http://www.dustcollectorhq.com/#sthash.ioeZwJ15.dpuf

 

 

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Topics: Cyclone Pre-Filter, trickle valve, Ceramics Expo 2017, vacu-valve

Aerodyne Environmental: Home of the Horizontal Cyclone and  Vacu-Valve® Airlock Valve

Inspired To Be Different.

At Aerodyne, we choose to take a different approach to collecting dust and handling materials. Our cyclones are unique in design to address common issues such as problematic dusts and space constraints. Our airlocks are chosen to fit your specific application instead of hastily installing traditional equipment options. We believe that when we see things differently, we can solve problems effectively. That's why so many people turn to us for help in solving their tough dust problems.

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