Pressure control valves control the maximum pressure level in a hydraulic circuit.

Unloading valves read the pressure in their own line.

The dashed line around two relief valves on a schematic is called a component enclosure.

Pressure reducing valves increase pressure in a branch level circuit in a hydraulic system.

Sequencing valves send flow back to the tank.

Counterbalance valves are used to prevent a load from accelerating uncontrollably.

Brake valves are designed to crack under pressure to protect a hydraulic circuit just like a fuse protects and electrical circuit.

Pilot-operated relief valves are usually smaller than direct-acting relief valves for the same flow and pressure ratings.

Direct-acting pressure relief valves have a wider range for the maximum pressure setting than a pilot-operated relief valve.

A sequencing valve is a pressure control valve that is used to force two actuators to be operated in sequence.

Counterbalance valves are used with cylinders; brake valves are used with hydraulic motors.

Like directional control valves, pressure control valves are available in either inline or subplate mounting styles.

Which of following best describes how to calculate the force of a cylinder?

Pressure relief valves limit the maximum pressure in a hydraulic circuite by providing an ______________ for fluid flow when pressure reaches a preset level.

Cross-over pressure relief valves are used to _______________.

Use the graph to answer the question.  The full-flow pressure is set to 2000 psi, the cracking pressure will be about ________. (hint: read page 276)

Use the graph to answer the question.  The full-flow pressure is set to 2000 psi, the pressure override will be about ________. (hint: read page 276)

In most hydraulic circuits a pilot-operated relief valve, rather than a direct acting relief valve, is used to control the ___________ pressure.

In the direct-acting design, a ball or ________ is subjected to pump pressure on one side and the force of a spring on the other.

The pressure at which the relief valve opens can be adjusted by changing the amount of spring compression, which changes the amount of ________ applied to the ball on the spring.

When the pressure is less than the relief valve setting, the pump flow goes to the _________.

A cross-over pressure relief is essentially ________ pressure relief valves combined into one package.

Two pressure relief valves are required because the motor is bi-directional and the motor inlet and outlet will ___________ depending on the direction of rotation.

Direct-acting valves are used in cross-over pressure relief valves because they have ________ response time and provide more cushion because of the larger pressure override.

Pressure reducing valves maintain a __________ pressure level in a branch circuit of a hydraulic system.

The reducing valve reads the pressure downstream, while the relief valve reads the pressure _____________.

An example of an application for a sequence valve is a circuit in which a clamp cylinder extends first to hold a workpiece, then a second cylinder ______ to bend the workpiece into a desired shape.

Counterbalance valves are pressure control valves that are used to ________ a load from accelerating uncontrollably.

When the weight is lowered, it may tend to drive the motor, instead of the motor lowering the weight.  This is known as an ____________ load.