How is reverse flow possible in pilot operated check valve?
A. spring force lifts the ball due to which reverse flow is possible
B. fluid pressure lifts the ball due to which reverse flow is possible
C. both a and b
D. none of the above
查看答案
A pressure relief valve can be
A. direct operated
B. pilot operated
C. solenoid operated
D. all the above
What is the difference between pressure relief valve and pressure reducing valve?
A. pressure reducing valve is connected between pump and tank line while pressure relief valve is connected between DCV and branch circuit
B. pressure relief valve is always normally opened
C. pressure reducing valve is connected between DCV and branch circuit while pressure relief valve is connected between pump and tank
D. none of the above
When is a pressure reducing valve used?
A. it is used when higher pressure than system pressure is required
B. it is used when lower pressure than system pressure is required
C. when absolutely zero pressure is required
D. all the above
Which of the following statements are true for throttle valve?1. Reverse flow of fluid is not possible2. Input pressure for a throttle valve is more than output pressure3. The actuator speed can be reduced by a throttle valve4. Correct flow control valve for a particular application can be selected on the basis of pressure drop specified
A. 1, 2 and 3
B. 1, 3 and 4
C. 2, 3 and 4
D. all the above
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