To avoid loss of antifreeze due to expansion, the cooling system .
A: must install a bypass valve
B: must not be completely filled
C: must be sealed
D: must install a pressure control valve
A: must install a bypass valve
B: must not be completely filled
C: must be sealed
D: must install a pressure control valve
举一反三
- The commonly used pressure control valve in hydraulic transmission system is ( ) A: directional valve B: relief valve C: hydraulic control check valve
- In order to ensure that the pressure difference between the front and rear of the throttle valve remains unchanged when the load changes, the flow through the throttle valve is basically unchanged. The throttle valve is often connected with ( ) to form a speed control valve, or the throttle valve and ( ) are connected in parallel to form a bypass speed control valve. A: Pressure reducing valve B: constant pressure reducing valve C: overflow valve D: differential pressure relief valve
- In a refrigeration system, if the cooling water to the condenser fails, the（）. A: box temperature solenoid valve will close B: expansion valve will close C: compressor will shutdown D: king valve will ope
- You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.
- Which of the following hydraulic control valves belongs to pressure control valve （ ）. A: Unloading valve B: overflow throttle valve C: Hydraulic control check valve D: Low pressure selector valve