The use of single pilot operated check valve line type is to lock an actuator in place, in one direction and make it insensitive to external forces.
The pilot allows the flow in the opposite direction.
This version is particularly suitable for in-line assembly.
MOUNTING AND OPERATION:
Connect the V port to the power supply, C port to the actuator and Pil to the pilot line.
The flow passes free in one direction while it is completely blocked in the opposite direction.
To allow the passage in the opposite direction, feed the Pil port.