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| Q. |
Which of the following valves is used to maintain pressure in the system? |
| A. | pressure relief valve |
| B. | check valve |
| C. | manual control valve with variable flow plug |
| D. | pneumatic control valve with variable-flow plug |
| Answer» A. pressure relief valve | |
| Explanation: a pressure relief valve maintains the pressure in the system. if the pressure is low, the spring holds the plug against the seat. when the pressure has reached a certain value, the force on the plug overcomes the spring force and the valve opens. | |
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