Hitachi ZW180 Technical Manual page 257

During Normal Operation:
HP
Orifice
During Relief Operation:
HP
Orifice
During Make-Up Operation:
HP
COMPONENT OPERATION / Steering Valve
Main
Poppet
LP
Piston Spring Chamber
Main
Poppet
LP
Piston Spring
Chamber
LP
Sleeve Spring A Passage A
Pilot Spring C
Poppet
Sleeve Spring A Passage A
Pilot
Poppet
Sleeve
Spring C
T3-5-9
Spring B
Spring B
T4GB-03-02-030
T4GB-03-02-031
T4GB-03-02-032