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Articles for NFPA

FAQs for NFPA

  • Q.

    Which parts of a rotary valve do I need to replace?

    A.

    The most common parts you need to replace on a regular basis include the rotor, shaft seals, and bearings. It’s a great idea to keep spare parts for your rotary valve. We have an NFPA compliance kit you can order to have the most important parts on your shelf just in case you need to make a quick replacement.

  • Q.

    Why do I need to check rotor-to-housing tolerances?

    A.

    Rotor-to-housing tolerances, or clearances, are the distance between your rotor tips and valve housing. Because they wear down over time, you should measure them as part of your regular maintenance routine. Increased tolerances leave a bigger gap for material to leak through, which prevents the valve from working effectively. This can lead to issues with material flow, NFPA compliance and safety, and overall efficiency. Check them often!

  • Q.

    My valve is losing too much air, what could be the problem?

    A.

    Too much clearance between the rotor, endplates and or housing can result in air loss. Measure the rotor to endplate and rotor to housing clearances to confirm that they are an NFPA compliant 0.0079 inches. If the clearance is larger than this, it might be time to replace your rotor, rotary valve, or have it sent back to ACS for a repair or evaluation. Make sure to stick to a maintenance schedule and check your clearances at least every three months.

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Recent Videos
How shear pin sprockets prevent damage to your valve
How shear pin sprockets prevent damage to your valve Material jams can damage vital parts of your rotary valve and lead to costly repairs. Watch the video to see how shear pin sprockets can help you avoid unnecessary downtime and parts replacements.
Why is rotor maintenance so important?
Why is rotor maintenance so important? Rotor tips wear down over time, causing issues with material flow. Our video illustrates why rotor maintenance is so critical to the overall efficiency of your rotary airlock valve.
See the Multi-Port Valve at work in 3D
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