General
Shipping: €1,95
If you have your own filter and dustbin and only wish to order the anti-crush pressure valve, the shipping costs within the Netherlands are €1,95 (letterbox package). The adjusted shipping costs will be automatically calculated. If you wish to order multiple valves, the package will no longer fit through the letterbox, and standard shipping costs will apply.
An anti-crush pressure valve acts as a safeguard, preventing the vacuum pressure inside a dustbin from becoming too high. Excessive vacuum pressure can cause the dustbin to collapse and become damaged. This is especially true for plastic bins, but it can also happen with metal containers that have thin walls.
Almost all plastic dustbins collapse under certain conditions, for example:
- when dust is being extracted through small dust ports (such as those on a sander or circular saw);
- when dust is being extracted through relatively narrow hoses (with an inner diameter of 32 mm or less) that are longer than 2.5 meters.
This happens because the vacuum cleaner continues to run at full speed, but not enough air can pass through due to the high airflow resistance. As a result, the vacuum pressure inside the dustbin increases, causing it to collapse. Not only powerful professional vacuum cleaners, but even standard household vacuum cleaners can often generate excessive vacuum pressure. Once a dustbin has collapsed, it becomes weaker and will collapse more easily in the future.
To prevent this, we have designed an anti-crush pressure valve specifically for filter systems with a plastic dustbins.
Necessary for
An anti-crush pressure valve is, in most cases, only necessary for filter systems with a plastic dustbin.
Important:
- Our filter systems with blue plastic dustbin (filter systems 3-30K and 3-60K) come standard with an anti-crush pressure valve.
- An anti-crush pressure valve is not needed for our metal dustbins. These have stamped reinforcement rings, making them resistant to high vacuum pressure.
Operation
When the negative pressure in the dustbin becomes too high, the valve will automatically open to let in air from outside. This reduces the vacuum and once it is low enough the valve closes automatically.
The resistance of the pressure valve can be accurately adjusted via the adjustment nut. When the adjustment nut is tightened, the valve will open later. This will increase the vacuum pressure threshold before the valve opens. The pressure valve can therefore be adjusted precisely to the strength of the dustbin and the power of the vacuum cleaner.
For a cyclone filter system to work properly, the anti-crush pressure valve must remain closed during normal use, otherwise dust will still end up in the vacuum cleaner. A valve that continuously opens is a sign that A. the spring resistance isn’t set correctly or B. the negative pressure is too high (for example, because dust is being sucked through a dust port that is too small). In those cases, a number of things can be done:
- Tighten the adjustment nut to increase the spring resistance. Turn the adjustment nut with a maximum of two rotations each time and then test the system. This prevents the pressure valve from being adjusted too tightly causing the valve not to open in a timely manner and thereby crushing the dustbin. For our blue dustbins the adjustment nut should be set slightly below the center of the threaded portion of the bolt.
- Lower the suctions power of the vacuum cleaner. Not too low, because there must be a basic vacuum pressure in the dustbin for proper operation.
- Use a nozzle with variable air inlet, for example our Pro-X nozzle. The nozzle can admit air from the outside by means of a slide, which reduces the vacuum pressure.
- Use a shorter hose on the side inlet of the filter. A hose creates air resistance: the longer the hose, the greater the air resistance. Greater air resistance creates greater a vacuum pressure.
- Use a hose with a larger inner diameter and a larger nozzle. As a result, more air can flow through the system which reduces the vacuum pressure.
- Reduce the number of bends in the hose that is attached to the side inlet of the filter. Every bend creates air resistance and thereby a greater vacuum pressure.
Important:
Do you want to use the system on machines whose dust port has an inner diameter smaller than 30mm and do you not have a vacuum cleaner with adjustable suction power? Then we recommend using a nozzle with variable air inlet, for example our Pro-X nozzle. Smaller dust ports will cause excessive vacuum pressure, causing the valve to open continuously.
Dustbin strength
Cyclone filter systems work on the basis of generating a vacuum inside a dustbin so that dust is drawn to the bottom of the dustbin. If you want to use the anti-crush pressure valve in combination with your own dustbin, then your dustbin must be of itself strong enough to withstand the pressure of the necessary minimum vacuum level.
The necessary minimum vacuum level is the minimum negative pressure required for the proper functioning of a cyclone filter system. Dustbins with thin walls, for example a paint bucket, paint can, plastic bucket, etc., are in most cases not strong enough to withstand the necessary minimum vacuum level. An anti-crush pressure valve is therefore not suitable in those cases, because the anti-crush pressure valve only ensures that air is admitted from the outside when the minimum vacuum level is exceeded to much.
To test whether your dustbin is strong enough to withstand the required minimum vacuum level, connect the side hose of the cyclone filter to the smallest dust port on your machines. Turn on the vacuum system—preferably on low power—and gradually increase the power while observing the dustbin. If it does not show signs of denting at full power, it is strong enough to handle the necessary vacuum pressure. In such cases, an anti-crush pressure valve can be used as a safeguard to prevent the dustbin from collapsing—for example, if the hose becomes clogged.
Package content
- Anti-crush pressure valve;
- Manual.
Important:
Do you need not only an anti-crush pressure valve but also a cyclone filter? On the product page of each standard-sized cyclone filter, the anti-crush pressure valve can be ordered at a discounted price.
Questions
Do you have questions? Most answers can be found on the frequently asked questions page. Can’t find the answer? Please contact us via our contact page. We are happy to help you.
