單項(xiàng)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

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單項(xiàng)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

單項(xiàng)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