Pressure Control Circuits (5)

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 pressure sequence valve operates on the principle that __________.

• Flow takes the path of least resistance

• System pressure rises when an actuator becomes extended

• Is described by Pascal's law

• All of the above

A check valve is sometimes used with a sequence valve to __________.

• Allow reverse flow

• Keep the valve from leaking

• Build pressure

• Prevent backflow

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 above

Cylinders are sequenced in the reverse direction using a(n) __________.

• Direct-acting sequence valve

• Pressure-reducing valve

• Two-sequence valve

• Single-sequence valve

A blocked drain on a sequence valve will cause __________.

• No change in function

• Reverse flow to occur

• The valve to stay closed

• None of the above

The purpose of a pressure-reducing valve in a circuit is to __________.

• Provide for over-pressure protection

• Drop the pressure in a branch circuit

• Sequence cylinder action

• None of the above

The two types of PRV's are __________.

• Two-way and three-way

• Indirect and direct

• Opened and closed

• Pilot operated and direct operated

A reverse flow check may be needed with a PRV because __________.

• A pressure spike could close the PRV

• An extra valve can't hurt anything

• It is needed for safety

• All of the above

Because pressure is on the downstream side of a PRV, oil will naturally seep into the __________.

• Spring chamber

• Spool

• Reservoir

• Tank