Flowserve Mechanical and Hydraulic - Manual (Page 21)

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Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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3.1.4. Operation – Hydraulic Hand Pump Override Installed on LHS Single Acting Actuator
Figure 17 - Hydraulic Hand Pump Manual Override Installed on LHS Single Acting Actuator
3.1.4.1 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:
3.1.4.1.1 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 and the
actuator is in fail safe position.
3.1.4.1.2 With reference to the schematic diagram (Figure 18), switch the manual selector MS in manual position “M” and switch the
manual valve SV1 in “MANUAL” position, as shown in the nameplate located nearby.
3.1.4.1.3 If an additional stop valve SV2 is installed, make sure it is in the open position.
3.1.4.1.4 To compress the spring, operate the PMP manual hand pump, acting on the lever (Figure 17).
3.1.4.1.5 After the manual stroke of the actuator in the direction to compress the spring, close the manual valve SV2 (if it is installed)
whenever it is requested to keep the spring compressed for long time.
3.1.4.1.6 To release the spring from the compressed position, open the manual valve SV2 (if it is present) and switch slowly the
manual stop valve SV1 in “AUTOMATIC” position, as shown in the nameplate located nearby.