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© 2015 Flowrox Oy. All rights reserved.
Contents are subject to change without notice.
SKW/ SKF-2015-09-ENG
2.3.2
Actuators
Standard actuators:
●
Handwheel / handwheel with gearbox
●
Pneumatic
●
Hydraulic
●
Electric
Manual actuator operation revolutions are shown in Table 6. Valves are closed by turning
clockwise.
Pneumatic actuators are with a fixed stroke and do not require external controls to position
the gate. The minimum supply pressure for pneumatically operated valves is 6 bars. Air must
be clean, waterless, lubricated and comply with ISO 8573-1:2001 Class 3.
Use correct sized pneumatic hoses to ensure sufficient air flow. Pneumatic actuator noise
level may exceed 85 dB and it is recommended to use ear protectors when working near the
valve.
Hydraulic actuators have a minimum supply pressure of 150 bars.
Electric actuators have open/close limit switches preset at the factory. A separate instruction
from the actuator manufacturer is always included in the shipment.
Please consult the manufacturer’s instructions on actuator requirements or/and limitations. If
actuator is changed or valve needs adjustment, follow the
Maintenance
instructions.
The gate speed may not exceed 25mm/s.
Table 6.Manually actuated valve operating revolutions.
Valve nominal size
DN
50
DN
80
DN
100
DN
150
DN
200
DN
250
DN
300
DN
350
DN
400
DN
450
DN
500
DN
600
Handwheel revs. to
stroke valve
18
25
28
40
50
60
-
-
-
-
-
-
Bevel gear revs. to
stroke valve
-
-
-
-
-
-
120
137
313
350
380
340
WARNING
