Flowserve Mechanical and Hydraulic - Manual (Page 20)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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3.1.3.1.5 To stroke the actuator in the open direction, switch the manual selector (4/2MV) to the OPEN position indicated on its
nameplate and operate the PMP manual hand pump, acting on the lever (Figure 14).
Figure 15 – Hydraulic Diagram of LPS Double-Acting Actuator with Hydraulic Override
3.1.3.2 Restoring Automatic Pneumatic Operation of the Actuator
To restore automatic operation:
3.1.3.2.1 Switch the manual stop valve SV1 in the “AUTOMATIC” position, as shown in the nameplate located nearby (Figure 16).
3.1.3.2.2 Open and keep open the manual isolation valve SV2 (if it is installed).
3.1.3.2.3 Restore the supply pressure inside the actuator’s pneumatic cylinder.
3.1.3.2.4 Operate actuator normally with supply pressure.
3.1.3.2.5 Check that the actuator is able to reach the fully closed and open position. It is possible to check the fully stroked position by
viewing the position indicator or limit switches, if fitted.
Figure 16 – Details of Hydraulic Hand Pump Manual Override for Double-Acting Actuator
SV1
4/2MV