题目内容

The center function of M-type three-position four-way directional valve is ().

A. pressure port unloading, two working oil ports locking,
B. pressure oil port unloading, two working oil ports unloading
C. all ports are locked
D. all ports are unloaded

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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

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

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