單項選擇題The symbol (GB786√1-93) at right side represents ()

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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題()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

5.單項選擇題()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