Flowserve Mechanical and Hydraulic - Manual (Page 22)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
22
Figure 18 – Hydraulic Diagram of Manual Override for LHS Single Acting
3.1.4.2 Restoring Automatic Hydraulic Operation of the Actuator
To restore automatic operation:
3.1.4.2.1 Open, and keep open the manual stop valve SV2 (if it is installed), and switch slowly the SV1 manual stop valve in
“AUTOMATIC” position.
3.1.4.2.2 Switch the manual selector MS in automatic position “A”.
3.1.4.2.3 Restore the supply pressure inside the actuator’s hydraulic cylinder.
3.1.4.2.4 Operate actuator normally with the hydraulic supply pressure.
3.1.4.2.5 Check that the actuator is able to reach the fully closed position in case of fail close actuator, or the fully open position in case of
fail open actuator. It is possible to check the fully stroked position by viewing the position indicator or limit switches, if fitted.
3.1.5 Operation – Hydraulic Hand Pump Override Installed on LHS Double-Acting Actuator
Figure 19 – Hydraulic Hand Pump Manual Override installed on LHS Single Acting Actuator