When used as a vibration damper, the internal air chamber ensures significant isolating effects from as low as 5 Hz, as its natural frequency is only 3.0 Hz. PLM air spring elements also isolate while unpressurized. The vertical natural frequency of the elastomer body is around 10 Hz and will therefore isolate interfering frequencies above 14 Hz.

The ratio of vertical to horizontal natural frequency with Fabreeka’s elastomer air spring is approximately 1:1 with high horizontal stability. The elastomer wall design in PLM air springs ensures large dynamic spring travel for applications vulnerable to shock and impact. External spacers / stops are advisable to prevent air spring strikethrough where low natural frequency of 3 Hz is still required.

The Fabreeka PLM pneumatic elastomeric mounts include a vulcanized threaded inlet for inflating the air springs, using either a Schrader valve or pneumatic screw attachment. No special connections are needed. Air springs with pneumatic screw connectors can be connected to the respective controlled air supply which eases pressurization and leveling.

FAQS

What methods are available for pressurizing and leveling the PLM isolators?

A hand pump or a regulated, compressed air supply can be used for pressurizing and leveling the PLM isolators. See maximum pressure on mount.

Can PLM isolators be supplied w/leveling valves for automatic self leveling?

Yes. The tank valve is replaced with a push fitting, and a custom base plate is required to attach the valve.

How often do I need to re-pressurize the PLM mounts?

You should not have to re-pressurize these mounts often. However you should periodically (monthly) check the inflated height, as temperature can have an effect on the air pressure.

Are metric threads available for the top plate?

Yes. Please contact Fabreeka’s Engineering department at 1-800-322-7352

or info@fabreeka.com to discuss your application.

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