单项选择题()can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.

A.Overflow valve
B.Reducing valve
C.Balancing valve
D.Reducing valve or balancing valve


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1.单项选择题The symbol (GB786√1-93) at right side represents ()

A.overflow valve
B.reducing valve
C.relief valve
D.sequence valve

2.单项选择题The symbol (GB786√1-93) at right side represents ()

A.overflow valve
B.reducing valve
C.relief valve
D.sequence valve

3.单项选择题Overflow valve is used to ()

A.control the fluid flow through it
B.prevent the pressure before it over the specified valve
C.make the pressure after it steady
D.control the direction of oil flow

4.单项选择题Hydraulic control check value is generally used to () in the marine hydraulic mechanism.

A.control the back pressure of return oil
B.lock the oil lines under some conditions
C.change the direction of oil flow
D.act as relief valve

5.单项选择题Check value is used to control ()

A.direction of oil flow
B.back pressure of return oil
C.bypass of filter
D.high pressure overflow

6.单项选择题()can cause oil flow from sludge outlet of self cleaning separator.

A.Too much sludge accumulated in separator bowl
B.Diameter of gravity disc too large
C.High level tank lack of water
D.Oil input too rapidly

7.单项选择题()can not cause oil flow from water outlet of self-cleaning separator.

A.Oil temperature too high
B.Diameter of gravity disc too large
C.Oil temperature too low
D.High level tank out of water

8.单项选择题()can cause oil flow from water outlet of a separator.

A.Oil inlet valve opening too quickly
B.Oil temperature too high
C.Diameter of gravity disc too small
D.Viscosity of oil too low

9.单项选择题When finish work on the oil separator, you should()firstly.

A.cut off the power
B.cut off the oil inlet
C.open guide water valve
D.close oil outlet value

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