Festo Кабели и принадлежности - Manual (Page 85)

3. Installation
3−7
Festo P.BE−SPC200−EN en 0901d
3.2.3 Compressed air reservoir (optional)
For good positioning behaviour during operation, fluctuations
in pressure of max. 1 bar are permitted in front of the proporĆ
tional directional control valve. In order to check the stability
of the supply pressure, you can fit a pressure measuring
point directly in front of the proportional directional control
valve.
· Install a compressed air reservoir (e.g. type VZS−...−B)
between the service unit and the proportional directional
control valve, if the positioning behaviour does not meet
your requirements and if you ascertain fluctuations in
pressure of over 1 bar in front of the proportional direcĆ
tional control valve.
In this way you can reduce fluctuations in pressure during
operation. You can compensate for slight excesses in the
permitted pressure by using supply tubing with a larger
diameter.
Reservoir volume:
The size of the reservoir volume depends on the cylinder volĆ
ume of the drive used and should be at least twice as large as
the volume of the cylinder used.
V
P
= 2 * V
Z
V
P
= buffer volume;
V
Z
= cylinder volume (V
Z
= r 2 * ģ * L
Z
)
L
Z
= cylinder stroke length
r = cylinder diameter / 2