The source of air cannot use a pressure regulation machine, when only 50kPa, such as electromagnetism blower and a rotary blower, is obtained.
In this case, as shown in the above figure, a flow control valve is arranged in front of a flow meter.
Or a flow control valve is omitted.
The flow meter uses a thing without pressure specification, i.e., the type used by normal pressure.
It is more desirable for this system to omit the flow control valve, and to control the source of air itself and to carry out flow control.
The flow control in electromagnetism blower supply voltage controlling.
The blower using a motor uses an inverter like rotary blower.
Or, use the proper size blower can generate the required air volume, or flow control valve to unnecessary, or making it seldom narrow down.
Because, since the pressure of the source of air will become high if a flow control valve is narrowed down, a bad effect (failure and shortened service life) may come out to blower of the source of air.
(Since a pressure switch like a compressor generally is not attached in electromagnetism blower, if an air blow-off mouth is closed, pressure will rise unusually.)
Moreover, if it extracts by a valve, pressure difference occurs between the entrance, and at the time of valve passage, temperature will fall, gas will dew by adiabatic expansion, and it will become easy to generate waterdrop.
This waterdrop carries out a bad effect to a flow meter or the Air Blow Heater.
(Since the air drier generally is not attached in the source of low-pressure air, generating of waterdrop requires cautions.)
When a flow needs to be greatly narrowed down by the case where flow regulation cannot be carried out in the source of air itself, please prepare a release valve, as shown in the following figure, and throw away unnecessary air.
If it carries out like this, damaging blower can be avoided and it can also control generating of waterdrop.
【 Note 】
Water and oil are include in the air, a bad affect will be carried out to the flow-meter and the Air Blow Heater.
Please be sure to use the air which removed oil and moisture.