Title: Assignment: Lab 4 - Hydraulic Speed Control
Course: Canvas Practice Course

LAP 4 - Hydraulic Speed Control

Introduction:

This LAP will explain details of why a needle valve or feathering a DCV causes the flow rate to be reduced.

This LAP will discuss two new valves: the flow control valve and the check valve. These valves will then be used to design a number of circuits that control actuator speed.

Objectives:

- Describe the function of a relief valve and give an application.
- Describe the operation of a direct-acting relief valve and give its schematic symbol.
- Describe how a relief valve is used for system protection.
- Describe how a relief valve is used for speed control assistance.
- Describe the function of a check valve and give an application.
- Describe the operation of three types of check valves and give their schematic symbol.
- Describe the function of the flow control valve and give an application.
- Describe the operation of a flow control valve and give its schematic symbol.
- Describe the effect of actuator load changes on flow control valve operation.
- Describe the operation of a meter-in flow control circuit and give an application.
- Describe the operation of a meter-out flow control circuit and give an application
- Define independent speed control and give an application.
- Describe how speed control valves can be used to provide multiple speeds.
- Describe how to calculate the extend of a hydraulic cylinder.
- Describe how to calculate the retract speed of a cylinder.
- Describe how to calculate the stroke time of a cylinder.

Materials and equipment:

1 ea. 85-BH Basic Hydraulic Training System

1 ea. 85 HPS Hydraulic Power Unit

1 ea. Stopwatch

1 ea. Allen wrench set

1 ea. LAP 4 Book

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