Flowserve Mechanical and Hydraulic - Manual (Page 18)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
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3.1.2.1.3 If an additional stop valve SV2 is installed, make sure it is in the open position.
3.1.2.1.4 To compress the spring, operate the PMP manual hand pump, acting on the lever (Figure 13).
3.1.2.1.5 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.
3.1.2.1.6 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 (Figure 13).
Figure 12 – Hydraulic Diagram LPS Single-Acting Actuator with Hydraulic Override
3.1.2.2 Restoring Automatic Pneumatic Operation of the Actuator
To restore automatic operation:
3.1.2.2.1 Open, and keep open the manual stop valve SV2 (if it is installed), and switch slowly the SV1 manual stop valve in
“AUTOMATIC” position, as shown in the nameplate located nearby (Figure 13).
3.1.2.2.2 Restore the supply pressure inside the actuator’s pneumatic cylinder.
3.1.2.2.3 Operate actuator normally with the supply pressure.
3.1.2.2.4 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 mean of visual position indicator or limit
switches, if fitted.