ARI Armaturen STEVI BBD 415 DN 25-50 EN - Manual (Page 13)

Rev. 0040321000 0714 Page 2-13
Operating and Installation Instructions
Straight-through blow-down valves - STEVI
®
BBD 415
7.4 Replacing the actuator stem seals
- Remove the actuator (refer to section 10.1).
DN 25:
- Unscrew the socket cap screws (pos. 50.91).
- Remove the flange (pos. 50.90).
- Extract the complete stem guide (pos. 50.3).
- Replace the O-rings (nos. 50.3.3 and 50.3.4), the scraper (pos. 50.3.5) and/or the guide
strip (pos. 50.3.2).
- Assemble in reverse order (for tightening torques refer to section 7.7).
DN 40, 50:
- Dismantle the actuator (refer to section 10.2).
- Remove the retaining rings (pos. 50.4) and the disc springs (pos. 50.5).
- Extract the stem guide (pos. 50.3.1).
- Replace the O-rings (nos. 50.3.3 and 50.3.4), the scraper (pos. 50.3.5) and/or the guide
strip (pos. 50.3.2).
- Assemble in reverse order (for tightening torques refer to section 7.7).
- To assemble the actuator, refer to section 7.5.
7.5 Assembling the valve and the actuator
- Screw the lock nut (pos. 21) downwards on the valve stem (pos. 5).
- Position the two lock washers (pos. 54) and the travel indicator (pos. 55) on the lock nut.
- Apply 6 bar control air pressure to the actuator.
- Mount the actuator on the valve.
- Fasten it with the nuts (pos. 52).
- Screw the valve stem (pos. 5) into the actuator stem (pos. 50.1).
- Reduce the control air pressure to the final signal.
- Screw the valve stem (pos. 5) upwards inside the valve as far as the stop.
- Lock with the nut (pos. 21) (for tightening torques refer to section 7.7).
7.6 Retrofitting the hand lever
- The hand lever can be retrofitted at any time.
- The locked straight pin (pos. 58) is mounted over the valve output and included in the
scope of supply.
- Slide the fork head of the lever (pos. 56) over the straight pin (pos. 58) and under the
travel indicator (pos. 55).
ATTENTION !
Refer to sections 10.0 and 11.0 before dismantling the valve.
DN 25 = 2.5 bar
DN 32 = 2.4 bar
DN 40 = 2.4 bar
DN 50 = 2.4 bar
ATTENTION !
- The actuator stem (pos. 50.1) must not be pulled down.