Flowserve Mechanical and Hydraulic - Manual (Page 12)

Mechanical and Hydraulic Overrides FCD LFENIM0004-00-AQ – 05/15
12
2.2.2 Operation – Not Enclosed Jackscrew Override Installed on LPS/LPC Single-Acting Actuator
Figure 6 – LPS/LPC Single-Acting with Not Enclosed Jackscrew Override
2.2.2.1 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:
2.2.2.1.1 Remove the supply pressure inside the actuator’s cylinder, and vent the cylinder ports.
2.2.2.1.2 For LPS series:
a. Operate the handwheel clockwise (CW) to close the valve (both on a fail close actuator, and on a fail open actuator).
b. Operate the handwheel counterclockwise (CCW) to open the valve (both on a fail close actuator, and on a fail open actuator).
2.2.2.1.3 For LPC series:
a. Operate the handwheel clockwise (CW) to close the valve (LPC actuator fail close) or to open the valve
(LPC actuator fail open).
b. Operate the handwheel counterclockwise (CCW) to open the valve (LPC actuator fail close) or to close the valve
(LPC actuator fail open).
NOTE: The spring constantly loads the screw, and it returns the actuator to fail safe position when the jackscrew is retracted
(for LPS series: rotating clockwise (CW) on a fail close actuator and rotating counterclockwise (CCW) on a fail open
actuator; for LPC series: rotating clockwise (CW)).