Festo CDVI-DN Description page 67

4. Commissioning
Festo P.BE-CDVI-EN en 1202e
The pilot air must be applied with a pressure of 3 ... 8 bar
immediately after being switched on, otherwise there is no
guarantee that the valve will reverse directly (see diagram).
If the pressure is less than 3 bar, there may be a delay before
the valve reverses, in spite of an electric signal. The gradual
pressure build-up of the overall supply does not affect the
actuator in that case. The actuator would react suddenly
(e.g. a cylinder would extend or retract suddenly, depending
on the valve function).
82/84
14
1
1
Externally supplied pilot air (3 ... 8 bar), branched
before the soft-start valve
2
Soft-start valve (gradual pressure build-up of the
overall supply)
Fig. 4/1: Example of valve-cylinder combination with gradual
pressure build-up of the overall supply
4 2
1
12/14
5 3
2
12/14
1
12
3
2
4-5