What type of valve is used to direct

单选题 What type of valve is used to direct the flow of hydraulic fluid?

A、 Relief valve.

B、 Direction control valve.

C、 Stop valve.

D、 Pressure control valve

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单选题 Relief valves are usually used to( )

A、control the fluid flow through it

B、prevent the pressure before relief valve over the specified value.

C、make the pressure after relief valve steady

D、control the direction of oil flow

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单选题 Generally, the symbol ( GB786. 1-93) of overflow valve is ( )

A、

B、

C、

D、

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单选题 GGenerally, the symbol (GB786. 1-93) of pressure reducing valve is( )

A、

B、

C、

D、

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单选题 The symbol ( GB786.1-93 ) represents( )

A、overflow valve

B、reducing valve

C、relief valvse

D、equence valve

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单选题 ( )are used to protect the system from over pressure.

A、relief valves

B、direction control valves

C、stop valves

D、reducing valves

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单选题 Check valve isn't used to control( )

A、direction of oil flow

B、back pressure of return oil

C、bypass of filter

D、high pressure overflow

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单选题 Delivery lines and discharge lines to and from the pump are often fitted with( )to prevent the liquid from flowing back.

A、butterfly valves

B、non-return valves

C、three-way valves

D、pressure reduce valves

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单选题 ( )is/ are used to limit the pressure in any particular portion and mainly control the pressure after the valve.

A、Relief valves

B、Check valves

C、Safety valves

D、Reducing valve

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