SPECIAL CONTROL VALVES

Servo valves are operated by _______ motors

Servo valves are less expensive than proportional valves.

• True

• False

• Neither True/ Nor False

A proportional valve is a valve that produces an output (direction, pressure, flow) that is _____ to an electronic control input.

Proportional valves are operated by proportional _____, whereas servo valves are operated by torque motors.

The performance of a proportional valve is a compromise between a conventional solenoid valve and _____ valve.

• Modular

• Servo

• cartridge

• All the above

In which systems, spool of the servo valve is operated by a torque motor?

• hydromechanical servo systems

• electrohydraulic servo systems

• conventional servo valve

• all the above

Which of the following statements is true for a proportional valve?

• spool of the proportional valve can travel maximum length

• digital type of functioning is possible in proportional valve

• proportional valve requires a separate flow control valve

• all the above

Which of the following is a characteristic of servo valve?

• open loop system

• closed loop system

• less contamination

• all the above

What does servo mean in servo valve system?

• It cannot receive a feedback and the desired output cannot be obtained

• It can receive a feedback and the desired output can be obtained

• It cannot receive a feedback but the desired output can be obtained

• none of the above

What is the advantage of DC solenoid coils?

• DC solenoid coils have high rush in current

• DC solenoid coils have rating of 220 V DC

• DC solenoid coils have constant level of current

• all the above