Functions of Flow-Control Valves

Manufacturers use flow-control valves to ________ speed.

• regulate

• increase

• measure

• ignore

Manufacturers use flow-control valves to ________ oil in proportions.

• divide

• heat

• color

• store

The speed of an actuator is directly proportional to the amount of ______ it is receiving.

• flow

• pressure

• voltage

• current

Which type of valve is mentioned as an example of a non-pressure-compensated control?

• Ball valve

• Orifice or needle valve

• Gate valve

• Butterfly valve

In mobile machinery, fluctuation of flow in non-pressure-compensated systems creates problems.

• True

• False

Pressure-compensation enables a DCV to:

• Maintain consistent flow regardless of load changes

• Increase the speed of the actuator

• Reduce the temperature of the hydraulic fluid

• Eliminate the need for a relief valve

Proportional flow divider valves provide oil flow to different branches to meet the supply demands of different ________ sizes.

• cylinder

• hose

• valve

• filter

Which of the following is NOT a variable that affects the amount of flow through an orifice?

• Oil viscosity

• Pressure drop across orifice

• Size of orifice

• Color of oil

Fill in the blank: The three variables that affect the amount of flow through an orifice are oil viscosity, pressure drop across orifice, and ________.

• size of orifice

• temperature of oil

• length of pipe

• type of pump

Oil viscosity is a variable that affects the amount of flow through an orifice.

• True

• False