valves are use in four stroke engine,
and ports are use in two stroke engine.
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There is no difference between check valve and NRV, both are same
power beyond valve has additional port that fluid is directed to when valve is in center (neutral) position. closed center valve has only in,out,a and b and no fluid flows when valve is in center position
I believe that servo is motorized and solenoid is magnetically activated.
They are just about the same
XV is shutoff valve UV is under control valve