题目内容

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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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

In a hydraulic system (a hydraulic pump driving an actuator), what type of center function should be selected to unload the pump and lock the actuator. ()

A. “M”
B. “Y”
C. “P”
D. “O”

A three-position four-way electro-hydraulic directional valve consists of a three-position four-way solenoid directional valve as the pilot valve and a three-position four-way hydraulic directional valve as the main valve. When the electromagnet is disenergized, the pilot valve returns to the center position, and then the main valve returns to the center position under the action of spring. What type of center function of the pilot valve should be selected ? ().

A. “O”
B. “Y”
C. “M”
D. “H”

The direct-acting relief valve is not suitable for high pressure and large flow relief valve because: ( )

A. The pressure is not set high
B. Too much pressure loss
C. Too small valve opening is easy to block
D. too large pressure regulation deviation