Cartridge Valve Insert
Function F15 - 1:1.5 ratio with flow restrictor
The F15 insert (1:1.5) and F20 insert (1:2) are the flow control functions with longer skirt and longer notch, hence more notch engagement enabling flow metering over larger stroke.
The adjustable limiting of the insert poppet opening restricts flow in both directions (A to B and B to A). Control is from pilot port X.
The adjustable poppet lift limiter restricts flow from A to B. The check function prevents flow from B to A. The X pilot port of the cover is connected to the B port of the insert.