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

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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

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

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