ARI Armaturen STEVI BBD 415 DN 25-50 EN - Manual (Page 16)

Page 2-16 Rev. 0040321000 0714
Operating and Installation Instructions
Straight-through blow-down valves - STEVI
®
BBD 415
10.0 Dismantling the valve
10.1 Dismantling the actuator from the valve
- Move the actuator into the upper travel position with control air pressure.
- Loosen the lock nut (pos. 21).
- Unscrew the valve stem (pos. 5) from the actuator stem (pos. 50.1).
- Loosen the fastening nuts (pos. 52).
- Dismantle the actuator from the valve.
10.2 Dismantling the actuator
- Reduce the control air pressure to "0" and disconnect the control air line from the
compressed air system.
- Loosen the screws (pos. 50.21) on the actuator and remove the diaphragm cover
(pos. 50.18).
ATTENTION !
Check the following points carefully:
- The piping system must be pressureless.
- The medium must be cool.
- The plant must be drained.
- The piping system must be purged of all caustic, inflammable, aggressive or
toxic media.
ATTENTION !
- The longer screws (pos. 50.23) should be loosened last symmetrically in order
to reduce the spring pre-tension gradually.
- The order described above must be observed to prevent injury to persons.