Flowserve Mechanical and Hydraulic - Manual (Page 23)

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Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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3.1.5.1 Manual Operation
a CAUTION: prior to operating the actuator by mean of manual overrides, be sure to remove the pressure inside the cylinder and
that the cylinder has been vented to atmosphere through the venting ports. Ensure that all vent valves are in vent position. The
number of these valves varies as per the actuator and control schematic types.
To manually operate the override:
3.1.5.1.1 Remove the supply pressure inside the actuator’s hydraulic cylinder.
a CAUTION: Before proceeding be sure that the hydraulic pressure inside the actuator’s cylinder has been removed.
3.1.5.1.2 Referring to the schematic diagram (Figure 20), switch the manual selector MS in manual position “M” and switch the
manual stop valve SV1 in “MANUAL” position, as shown in the nameplate located nearby.
3.1.5.1.3 To stroke the actuator in the close direction, switch the manual selector (4/2MV) to the CLOSE position indicated on its
nameplate and operate the PMP manual hand pump, acting on the lever (Figure 19).
3.1.5.1.4 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 19).
Figure 20 – Hydraulic Diagram of Manual Override for LHS Double Acting
3.1.5.2 Restoring Automatic Hydraulic Operation of the Actuator
To restore automatic operation:
3.1.5.2.1 Switch the manual stop valve SV1 in the “AUTOMATIC” position, as shown in the nameplate located nearby.
3.1.5.2.2 Switch the manual selector MS in automatic position “A”.
3.1.5.2.3 Restore the supply pressure inside the actuator’s hydraulic cylinder.
3.1.5.2.4 Operate the actuator normally with hydraulic supply pressure.
3.1.5.2.5 Check that the actuator is able to reach the fully closed and open position. It is possible to check the fully stroked position by
mean of visual position indicator or limit switches, if fitted.