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You just installed a brand new rotary airlock and just minutes after start-up, it begins emitting an annoying squeal. What do you do?
Most often, high-pitched noise from a rotary valve is caused by a lack of clearance between the rotor and valve body, resulting in metal-to-metal contact. Follow these tips to get to the bottom of the issue:
- OPERATING TEMPERATURE
Check the material temperature coming into the valve and the process air temperature above and below the valve. Many times these values can exceed the design temperature of the valve, resulting in thermal expansion greater than the amount of compensation built into the valve at time of order.
- ROTOR MISALIGNMENT
When a new valve is received, always check it for signs of damage and attempt to operate the rotor with a soft push stick (DANGER! NEVER INSERT YOUR HANDS INTO THE VALVE, SEVERE INJURY COULD OCCUR!) This is an excellent way to detect if the rotor has been jarred in transit. If so, consider re-centering the rotor in its valve body. Keep in mind that in some rare cases, mishandling or improper assembly can also cause the same condition.
- RUST/ CORROSION
Many valve materials are susceptible to surface rusting that can diminish the valve’s operating clearance. Always inspect your valve for signs of surface rust upon receipt and take steps to protect your valve during extended storage.
- IMPROPER INSTALLATION
Always consider how your valve is to be installed into your process. Keep in mind that valve housings are made from soft materials and can be distorted by supporting excessive weight from above or suspending excessive weight from below. A valve is particularly susceptible to distortion when the end plates and rotor are removed from the body.
- EXCESSIVE DIFFERENTIAL PRESSURE
All valves have a differential pressure limitation. This pertains to the rotor & end plate’s ability to resist deflection and deformation under the applied pressures above and below the valve. Make sure that the valve you purchase can withstand the operating conditions for your system.
If you suspect any of the above to be the cause your problem, consult your owner’s manual or contact your valve supplier for further assistance.
Prater-Sterling Customer Support -- (630) 759-9595
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