____________________________________________________________________________________
STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5100, rev. 06 06/2020 – RTC/RTCS
- 15 -
7.3 Mechanical manual override (If any)
The mechanical manual override is used for the manual operation to open/close the valve, in lack of
supply pressure.
Fig. 7 –
Mechanical manual override for
double acting version
Fig. 8 –
Mechanical manual override for
single acting version
Prior to engage mechanical override, pneumatic cylinder shall be depressurized.
Double acting:
Turn counter-clockwise the hand-wheel (1) in the end flange to open main valve taking care the
handwheel (2) on the centerbody is not engaged and turn clockwise the hand-wheel (2) in the centerbody
flange to close main valve taking care the hand-wheel in the end flanges not engaged.
To restore remote/normal condition turn hand-wheel (1) clockwise against travel stop and turn hand-
wheel (2) counter-clockwise against travel stop.
Single acting to close:
Turn counter-clockwise the hand-wheel (3) in the end flange to open main valve. To restore the
normal/remote condition turn hand-wheel clockwise against travel stop.
Single acting to open:
Turn clockwise the hand-wheel (3) in the end flange to close main valve. To restore the normal/remote
condition turn hand-wheel counter-clockwise against travel stop.
.
1
2
3
