The speed regulating valve (installed between the hydraulic pump and the actuator) regulates ____ to control the speed of the actuator. ()
A. hydraulic pump flow
B. oil discharged from actuator
C. actuator supply pressure
D. the area of its opening
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which fast speed circuit is most suitable for the situation where the system needs large flow in a short time? ()
A. Hydraulic cylinder differential connection fast speed circuit
B. Double pump oil supply fast speed circuit
C. Speed increasing cylinder fast speed circuit
D. Fast speed circuit with accumulator
The unloading circuit is used for ().
A. reducing flow loss
B. reducing pressure loss
C. reduce power loss
D. increase system heating
The volumetric speed control circuit with constant power output is ( ).
A. variable displacementpump--variable displacement motor circuit
B. fixed displacement pump--variable displacement motorcircuit
C. variable displacement pump--fixed displacement motorcircuit
D. fixed displacement pump--fixed displacement motorcircuit
The function of the relief valve is to cooperate with the oil pump to overflow the surplus oil in the system, so as to keep the system__________ stable.()
A. pressure
B. flow rate
C. flow direction
D. cleanliness
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