Flowserve Mechanical and Hydraulic User Manual
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Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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Figure 13 – Details of Hydraulic Hand Pump Manual Override for Single-Acting Actuator
3.1.3 Operation – Hydraulic Hand Pump Override Installed on LPS Double-Acting Actuator
Figure 14 – Hydraulic Hand Pump Manual Override Installed on Double-Acting Actuator
3.1.3.1 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:
3.1.3.1.1 Remove the supply pressure inside the actuator’s cylinder and vent the cylinder ports.
3.1.3.1.2 Referring to the schematic diagram (Figure 15), switch the manual stop valve SV1 in “MANUAL” position, as shown in the
nameplate located nearby (Figure 16).
3.1.3.1.3 Close the additional manual isolation valve SV2 (if it is installed).
3.1.3.1.4 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 14).
SV1