Fig. 17, Fig. 18 – Burkert Type 8791 User Manual

Page 27

Fluid connection

single-acting actuator - control function A or B

Connection:
working connection A1 to
actuator
A2 sealing

Connection:
working connection A2 to
actuator
A1 sealing

Fig. 17: Connection A1

Fig. 18: Connection A2

9.3.2. Double-acting actuators

actuator system

safety positions after failure of the

electrical aux-

iliary power

pneumatic

auxiliary power

down

lower-
chamber

upper
chamber

→

Connection
see “Fig. 19”

not defined

up = lower

chamber of the

actuator to A2

down = upper

chamber of the

actuator to A2

Control function I

Tab. 11: Safety positions - double-acting actuators

double-acting actuators - control function I

Connection:
Working connection A1 and A2
to actuator
Safety position:
up = lower chamber to A2
down = upper chamber to A2

Fig. 19: Connection with control function I

english

Type 8791