Air spring isolators are another part of Fabreeka’s portfolio. Bellows cylinder air springs, also known as rolling lobe isolators or airbag isolators, provide low frequency vibration isolation for applications requiring high dynamic vibration amplitudes and lifting heights.
Rubber air springs may have vertical and horizontal natural frequencies from 0.6 Hz, depending on operating height, and belted bellows cylinder design (single, double or pneumatic air bellows). Horizontal spring rate, that is the stiffness of the system, and stability also depend on operating height, so each air cushion type has an ideal operating height.
Lower vertical natural frequencies are achievable by increasing air volume, for example with an auxiliary tank. A large usable stroke range is a key feature in Fabreeka’s belted bellows air spring isolators (RLA), with stroke ranges from 2” to 3” possible depending on bellow design – ideal for applications prone to large dynamic deflections.
Fabreeka as complete system provider
A complete isolation system consists of at least three controlled bellows cylinder air springs for three-point level control. Each air spring isolator made by Fabreeka has an integrated level control valve that functions as a load and position sensor. If larger loads should be carried by the construction, any number of additional air springs can be added. Moreover, when working with Fabreeka, each system comes with a control panel, automatic height control valves, pneumatic tubing and all of the pneumatic accessories necessary for complete system installation.
What is the leveling accuracy of the PAL isolators?
The leveling accuracy of the PAL isolators depends on the type of valves used. The standard FLV-4 valve has an accuracy of +/-0.005″, while the optional FLV-7 valve has an accuracy of +/-0.001″.
What are the vertical and horizontal damping values for PAL isolators?
The vertical damping value of a PAL isolator is adjustable by 6-20% on all standard sizes, while the horizontal damping is 3-6% depending on the isolator type.
Will you explain transmissibility/percent isolation?
The transmissibility of an isolator is a relative measure given as a ratio of output amplitude to input amplitude. The lower this ratio, the greater isolation an isolator provides.
Which leveling valve is recommended for my application?
The standard PAL isolators use the FLV-4 valve, which is suitable for most applications. If the isolated mass has a distance between isolators less than three times the vertical center of gravity, is supported by only three isolators or a large moving mass, a FLV-7 valve may be necessary. Large systems may require higher flow valves. Please contact Fabreeka’s Engineering department at 1-800-322-7352 or firstname.lastname@example.org to discuss your specific application.
What size PAL isolators should I use for my application?
PAL isolators are sized based on the total supported mass and the number of isolators used. All isolators have a maximum load capacity at 100 psi, which should not be exceeded. All isolators should have a working pressure within 15 psi of each other for stability.
What type of tubing should be used to connect to my air supply?
All tubing and fittings used for our pneumatic systems should be rated for a minimum of 120 psi working pressure. 1/4″ OD tubing is a minimum recommendation. Tubing and fittings are supplied with our systems.
What are the major design parameters/calculations when choosing pneumatic isolators to isolate my equipment?
In order to select a pneumatic isolation system, the following information is necessary:
What is the air consumption of a PAL system?
The air consumption is determined by the valves used in the system. The maximum consumption is 16 scfm at 100 psi during the initial filling, but if less is available, it will simply take longer to fill the isolators. During normal operation, the system will consume zero to 4 scfm, depending on how much the isolated mass moves.