S -2
S -2
Priority Valve 2. Principle of operation 2.1 Neutral state
1. The oil from the pump enters the priority valve
2. The pressure difference produced when the oil
through port P and, passing through the external
passes through orifice Cdy (called “dynamic
passage of spool, it reaches port CF.
orifice”) causes spool to move toward spring until
From port CF, the oil flows through the internal
the oil pressure pushing the spool balances with
passage of the spool and then through the
the spring force. As a result, almost all the oil
following:
delivered from the pump is routed through port EF
Orifice Cdy → Pressure chamber B → Orifice Cls
and available for use by the other actuator
→ LS port of orbitrol→ tank.
circuits.
4
W126-0021E
