TECH 343 Servo and Nonservo  Hydraulics

Experiment #4: Speed Control Methods For Hydraulic Circuits

Equipment

1. Vickers hydraulic training bench

2. Cylinders, vertical and horizontal

3. Directional valve

4. Flow control valve

5. Weight

6. PC w/Labview program

Objectives

1. To design linear circuits with speed controls using meter-in, meter-out, and bleed-off methods.

2. To determine the operating characteristics of the different speed control methods.

Procedure

1. Using the horizontal cylinder construct a hydraulic circuit with the extension speed controlled by the meter-in method.

2. Select various settings of the flow control valve and record the velocity and pressure for extension and retraction using a relief valve setting of your choice.

3. Repeat steps 1 and 2 using the vertical cylinder.

4. Add the weight to the vertical cylinder and record the effects on the speed and pressure.

5. Repeat steps 1 through 4 using the meter-out method.

6. Repeat steps 1 through 4 using the bleed-off method.

7. Using the vertical cylinder construct a circuit to control the speed in both directions using the method you consider to be the most reliable.

8. Repeat step 2.

Questions

1. What additional feature does the flow control valve possess? Make sure your circuit schematic shows this feature as verified by your data.

2. What are the advantages and disadvantages of each of these speed control methods?