Figure below shows 5/2 way valve which uses suspended disk instead of spool. In spool type valve, spool controls the opening and closing of ports. In this type, suspended disc controls the opening and closing of ports.
This suspended disc can be moved by pilot pressure at port 14 or port 12. When the pilot pressure acts through port 14. The ports 1 - 2 and 4 - 5 are connected and 3 is blocked. When the air is given to pilot line 12, then 2 - 3 and 4 -1 are connected and 5 is blocked