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
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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
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
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
Which of the following pressure control valves has a direct outlet to the tank ( )
A. Sequence valve
B. pressure reducing valve
C. pressure relief valve
D. pressure relay
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