Int. Hydraulics Mod 3

Multiple pressure relief valve operation ______________ (Page 73)

• Allow venting

• Allows operating the circuit at two different pressures

• Saves power

• All of the answers are correct

Unloading a pump can be done using a ___________ (Page 69)

• Direct-Acting relief

• Tandem Center DCV

• Float center DCV

• Pressure-compensated flow control valve

The ________________ of a pilot operated relief valve can be used to change the pressure setting of the relief valve from a remote location. (Page 68)

• Spool

• Vent port

• Spring

• Poppet

Remote operation of a pilot operated valve _______________ (Page 68)

• Allows the relief to operate at two pressure levels

• Requires use of a small DCV

• Allows the machine operator to easily change the pressure settings

• None of the answers are correct.

When the needle valve is completely closed, pressure rises at the relief valve inlet, increasing the _____________ across the relief spool (Page 65)

• Volume

• Spring Force

• Pressure Differential

• Time

The advantage of a pilot-operated relief valve over a direct-acting relief valve is ________ (Page 60)

• Shorter Pressure Span

• Lower Cost

• Less leakage

• Less parts