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
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