Burkert Type 8681 - Manual (Page 20)

20
Technical Data
6.4. pneumatic data
control medium: oil-free and dry air, neutral gases
Quality classes in accordance with DIN ISO 8573-1
(5 µm filter recommended)
Dust content Quality class 5: max. particle size 40 µm,
max. particle density 10 mg/m 3
Water content Quality class 3: max. pressure dew point -20 °C or min. 10 °C below
the lowest operating temperature
Oil content Quality class 5: max. 25 mg/m 3
temperature range
of compressed air:
-10 - +50 °C
pressure range: 2.5 to 8 bar
air rate solenoid valve: 110 I
N
/min (for aeration and deaeration, ventilation)
(110 I
N
/min - supplied state
200 I
N
/min - maximum typical flow-rate)
(Q
Nn
value according to definition for pressure drop from 7 to 6 bar absolute
at +20 °C)
connections: Intake and exhaust air connection G1/4
Working connections G1/8
The intake and exhaust air can be set separately for each solenoid valve using flow restriction screws, in order to
be able to affect the expansion and retraction rates of the process valve (see figure below).
Mechanical
manual control
Red lever:
left: 0
right: 1
Flow restriction screws
for:
Exhaust R
Intake P
Flow restriction screws of the solenoid valves Fig. 4:
When setting the retraction and expansion rates of the pneumatic actuator consider that constant
"primary pressure" is not present during deaeration!
Keep in mind that the working conditions in the process valve area on the side of the product
(flow types, pressure variations) may result in changes in the set aeration and deaeration times.
english
Control Head Type 8681