超星 - Chapter_5_Control Valve

单选题

The flow control valve is used to control the flow of the hydraulic system, so as to control the actuator's ().

A. direction of movement;
B. speed
C. pressure
D. output force

查看答案

单选题

In the large flow hydraulic system, what type of directional control valve should be used? ()

A. electromagnetic
B. electro-hydraulic
C. manual
D. mechanical

查看答案

单选题

When overflow exists in the fixed pressure relief valve, it can maintained____ stable. ()

A. inlet pressure of the valve
B. outlet pressure of the valve
C. inlet and outlet pressure of the pump
D. the actual flow of the pump

查看答案

单选题

The speed regulating valve is made of ().

A. throttle valve and constant pressure reducing valve in series
B. throttle valve and sequence valve in series
C. throttle valve and constant pressure reducing valve in parallel
D. throttle valve and sequence valve in parallel

查看答案

单选题

If a three-position directional control valve is workin in center position, the pressure oil is connected with the two chambers of cylinder, and the return oil is closed, then the center function of the valve is ________ type. ()

A. P
B. Y
C. K
D. C

查看答案

单选题

Compared with throttle valve, the remarkable characteristics of speed regulating valve are ().

A. good flow stability
B. simple structure and low cost
C. large adjustment range
D. limit of minimum pressure difference is small

查看答案

单选题

The main hydraulic components used in the pressure regulating and reducing circuit are ( ).

A. directional valve and hydraulic control check valve
B. pressure relief valve and pressure reducing valve
C. sequence valve and pressure relay
D. check valve and pressure relay

查看答案

单选题