Basic Hydraulics Mod 5 Pressure Control Circuits

Cylinders are sequenced in the reverse direction using a (n) ____________ (Page 157

• Direct-acting sequence valve

• Pressure-reducing valve

• Two-sequence valve

• Single-sequence valve

A reverse flow check may be needed with a PRV because ______________ (Page 164)

• A pressure spike could close the PRV

• An extra valve can’t hurt anything

• It is needed for safety

• All of the answers are correct

A check valve built into the same body with a sequence valve may be called a (n) ________-

• Integral Check

• Bypass Check

• Reverse flow check

• All of the answers are correct

A blocked drain on a sequence valve will cause ______________(Page 158)

• No change in function

• Reverse flow to occur

• The valve to stay closed

• None of the answers are correct

Sequence valves are most often used to _____________

• Replace a relief valve

• Avoid the cost of an electrical control circuit

• Protect the pump

• Control downstream pressure

The purpose of a pressure-reducing valve in a circuit is to _______________ (Page 159)

• Provide for over-protection

• Drop the pressure in a branch circuit

• Sequence cylinder action

• None of the answers are correct

A check valve is sometimes used with a sequence valve to __________ (Page 164)

• Allow reverse flow

• Keep the valve from leaking

• Build back pressure

• Prevent back-flow

Because pressure is on the downstream side of a PRV, oil will naturally seep into the _________ (Page 166)

• Spring chamber

• Spool

• Reservoir

• Tank

The pressure sequence valve operates on the principle that ___________ (Page 146)

• Flow takes the path of least resistance

• System pressure rises when an actuator becomes extended

• Is described by Pascal’s Law

• All of the answers are correct

The two types of PRV’s are ______________

• Two-way and Three-way

• Indirect and direct

• Opened and closed

• Pilot operated and direct operated