Kitz FBS - Air Consumption

Document No.:KE-4011-03 Page: 6/27
11. Air Consumption
Air consumption means the volume (Q) of the air released to the atmosphere from an actuator operating
[n] times forward and backward per hour as converted to the average volume per minute. Decide the
capacity of an air compressor using the result of the following calculation. We recommend to use an air
reservoir of an adequate size to constantly operate an actuator at the preset time.
◆ Air consumption of FBS actuator:
Q = V (P + 0.1013) / 0.1013 x n/60 [L/min.(ANR)]
V: Volume of actuator housing [L]
Refer to Table 2 and the illustration shown below.
P: Air operation pressure [MPaG]
n: Number of operation cycles per hour
Table 2 Volume of actuator housing
Fig3

The required capacity of an air compressor depends on the availability and the
volume of an air reservoir, the number of hourly operations, the time required for
valve stroke and whether the air compressor is used exclusively or otherwise for
the actuator.

To decide the practical capacity of air compressors and reservoirs, adding some
extra 30% to the calculated air consumption volume is recommended to absorb
possible loss of air caused during a travel through air tubing and accessories.
 Use an air-filter to continually supply clean, dry air to an actuator.
 Use plastic tapes for tightly sealing piping connection, ensuring that tape ends do
not enter into the tube bore and block the port.
 Also ensure that there is no leakage of air through all tubing connections.
Insufficient supply of air pressure causes malfunction or failure of an actuator.
 Appropriately design the total length of air tubing. Too long air tubing causes
pressure loss or insufficient flow rate of the air, and results in malfunction or
failure of an actuator.
Actuator type V [L]
FBS－1 0.15