Watson-Marlow SP40 - Manual (Page 49)

MAINTENANCE OF CAM AND ACTUATORS
46
8.6.2 Counter clockwise pump operation
Pressurizing port 1 on the spool valve without
electrically activating the valve will result in a clockwise
rotation of the actuator towards "closed" position. This
brings the pump in pumping position.
Pressurizing port 1 on the spool valve and electrically
activating the valve will result in a counter clockwise
rotation of the actuator towards "open" position. This
brings the pump in CIP position.