oldnslo
Super Member
Since not sure what the schematic or circuit looks like I am only guessing but suspect the intent of the screen is to catch debris in lines from cylinder to manifold.Screen for catching pieces of O-rings?
Screens on valves are semi worthless unless they only flow in one direction since flow in the side of the valve screen collects debris while flow in the nose debris is flushed back into the system.
Looking at picture that check prevents(blocks) flow from side to nose based on O-ring and backup ring orientation.