- Fail Mid 180° actuators with 90° safety position
FM-Version
FAIL MID
DESCRIPTION | FM-VERSION
- versions available:
-
- A – General industry
- P – Process industry
- E – corrosive environment
- EC – Onshore, Offshore
- applied standards:
-
- DIN EN 15714
- ISO 5211
- DIN 3337
- VDI/VDE 3845
- NF E29-409
- Namur
The Fail Mid 180° actuators with 90° safety position are used for 0°-90°-180° circuits in which a 90° angle at air failure should be approached. On both sides of the actuator a spring block is mounted which is tensioned by the rotation of the 90° position.
The fail mid 90° (safety) position is achieved by the action of the spring force, in air or power failure, from 0° or 180° position.
A control with solenoid valve that controls the flow of pilot air supply is required for the proper functioning of the single acting actuators 180° with 90° safety position.
from 90° to 180°:
Air supply at port 2 forces the pistons outwards from the center position and compresses the springs on the inner plate. A rotating counterclockwise direction is obtained.
from 90° to 0°:
Air supply to the port 4 moves the piston inwardly and compress the springs on the outer plate. A clockwise rotation is obtained.
Air failure: 180°:
At power failure (air or electric failure) at port 2, the pistons are moved by the spring force inwards to the center position. A clockwise rotation is effected.
0°: If power fails at port 4, the pistons are moved by the spring force in outside direction to the center position. A rotating counterclockwise direction is effected.
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ATED2010FailMid (EN)
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EB_AT-RP-4GU_EN_en
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