题目内容

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”

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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”

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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

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The relationship between a. pressure loss and b. unloading pressure of pilot relief valve should be ()

A. a>b
B. a=b
C. a D. uncertain

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If the damping orifice of pilot-operated pressure relief valve is blocked, what would happen?

A. There is no overflow
B. The inlet pressure of the valve is infinite
C. The inlet pressure ov the valve increases with the increase of load
D. The inlet pressure cannot be adjusted

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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”

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

The relationship between a. pressure loss and b. unloading pressure of pilot relief valve should be ()

If the damping orifice of pilot-operated pressure relief valve is blocked, what would happen?

A. “M”
B. “Y”
C. “P”
D. “O”