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Manual BR13 Version 1.2 07.11.2019
5.1 Changing the operating mode of the drive
No additional components are required in order to alter the direction of operation of type P/R pneumatic drives.
Changing P to R and vice versa
1. Disconnect the valve from the drive.
2. Ensure that no air pressure is applied to the drive.
3. Remove the top cover of the position drive, taking care that the tensioning nuts (long nuts) (82) are unscrewed to
the ends – in accordance with the notes on the warning label.
The further steps in the procedure depend on the current operating mode of the drive before it is changed.
To change the drive function from P to R, proceed as follows:
4. Undo the special nuts (34) from the bolts on the positioning drive.
5. Remove the membrane with its membrane plate, spacer ring, washer and spacer cover (or spacer covers for drive
sizes 630 and 1000).
6. Remove the springs (31) from the lower casing.
7. Turn the membrane together with all the parts as listed above through 180 degrees, and fit the membrane back
over the drive bolts.
8. Screw the special nuts (34) on to the drive bolts, thus compressing the whole of the above group of components.
9. Place the springs on the membrane plate so that they fit in the guide cut-outs and their ends are aligned with the
axis of the bolts.
10. Place the top cover over the springs and initially tighten the tensioning nuts (82).
11. Compress the springs evenly until the upper part of the drive end-stop is pressed against the lower part, then insert
the rest of the bolts and screw on the nuts.
To change the drive function from R to P, proceed as follows:
4. Remove the springs (31) from the membrane plate (28).
5. Undo the special nuts (34) from the bolts on the positioning drive.
6. Remove the membrane with its membrane plate, spacer ring, washer and spacer cover (or spacer covers for drive
sizes 630 and 1000).
7. Place the springs in the designated locations in the lower cover.
8. Turn the membrane together with all the parts as listed above through 180 degrees, and fit the membrane back
over the drive bolts, so that the 6 mm diameter opening on the base and the nut on the edge of the drive membrane
plate are axially aligned with one of the openings on the edge of the membrane.
9. Screw the special nuts (34) on to the drive bolts, thus compressing the whole of the above group of components.
10. Place the springs on the membrane plate (28) so that they fit in the guide cut-outs. To check that the springs are in
the correct position, rotate the membrane (to the position of the notch on the nut at the edge of the membrane
plate) until the 6 mm opening on the base is visible. By sighting through the opening, check that there is a spring in
place on the underside.
11. Place the top cover over the springs and initially tighten the tensioning nuts (82).
12. Compress the springs evenly until the upper part of the drive end-stop is pressed against the lower part, then insert
the rest of the bolts and screw on the nuts.
5.2 Changing the membrane
Should it be necessary to change a membrane, the drive should be dismantled as described in item 6.1. Instead of putting
the drive back together in reverse order, it should simply be re-assembled in its original order after changing the membrane.
6. Other Drives
It is possible to equip model BR13 valves with electrical drives. Sizing the drive to the regulator valve is normally a part of
the bidding process.
It is also possible to supply model BR13 valves with a purely manual operation (type NN), or to fit the pneumatic drive with
an additional hand-wheel (type P/R-N).
(See the following diagrams)
