Burkert Type 8681 Manual do Utilizador descarregar pdf (Página 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

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

Temperature range

of compressed air: -10 - +50 °C

Pressure range: 2.5 to 8 bar

Air rate solenoid valve: 110 I

/min (for aeration and deaeration, ventilation)

(110 I

/min - supplied state

200 I

/min - maximum typical ﬂow-rate)

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 valvesFig. 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

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