题目内容

In the hydraulic system, which valve can be used as back pressure valve. ()

A. pressure relief valve
B. pressure reducing valve
C. hydraulic control sequence valve
D. speed regulating valve

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Low pressure system generally selected __________ structure pressure relief valve as safety valve. ()

A. differential type
B. pilot type
C. direct acting type
D. cone valve type

The orifice of throttle valve should select ().

A. thin wall hole
B. short hole
C. slender hole
D. A + C

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

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

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

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

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