In a hydraulic circuit, the operating sequence needs to be changed frequently, what type of circuit should be adopted? ()
A. Sequential action circuit controlled by stroke switch
B. Sequential action circuit controlled by stroke valve
C. Sequential action circuit controlled by pressure relay
D. Sequential action circuit controlled by sequence valve
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In order to make the working mechanism can stay at any position reliably, for instance payload of a hydraulic crane, and the working mechanism will not slip under the condition of force, what circuitis usually used? ()
A. unloading loop
B. pressure regulation circuit;
C. pressure counter-balance circuit;
D. back pressure circuit.
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
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
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