Lab 5 Directional Control Valves
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Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro Lab Title:
Directional Control Valve Circuits
Student Name
: Section:
Instructor:
Paul Bligdon
Centennial College: Paul Bligdon
Page 1
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro Parker’s Training Bench DCV Circuit
This hydraulic lab introduces concepts in the control and operation of a directional control valve as it applies to a manually operated valve Students will examine the operation of a
typical hydraulic circuit with close attention being paid to the functioning of a directional control valve as it applies to the conservation of energy during machine idle. This lab exercise reinforces the theory studied during the lecture period and classroom assignments.
Learning Outcomes
At the conclusion of this lab, you will be able to:
Work in compliance with the Ontario //Health and Safety Act and the College’s
Safety Standards during the performance of the lab exercise.
Sketch the lab’s manual DCV circuit using ANSI symbols
Reference both System Pressure and Flow Rate at various points in the circuit
Describe the energy saving effect of the open center condition
Install and operated both the solenoid and manually operated DCV Centennial College: Paul Bligdon
Page 2
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro Procedure: 1.
Turn the power distribution panels electrical disconnect switch to the “on” position.
2.
Release the emergency stop push button
3.
Ensure that the pressure compensator’s vent handle is in the passing position (horizontal)
4.
Depress the training bench start button.
5.
Turn the vent handle to the non-passing position.(vertical)
6.
Adjust the relief valves adjusting knob until the system pressure seen on PGM gauge reads
1000 pisg.
7.
Depress the training bench “off” push button.
8.
Depress the emergency stop button.
9.
Turn the power distribution panels electrical disconnect switch to the “off” position.
10. Connect a hose from the pressure manifold block to the inlet port of the flow meter
11. Connect a hose from the outlet port of the flow meter to the “P” port of the solenoid operated
directional control valve
12. Install a hydraulic tee on the piston port of the horizontal cylinder.
13. Connect a hose from the “A” port of the directional control valve to one leg of the tee located
on the piston port of the cylinder
14. Install a portable pressure gauge on the other leg of the tee located on the piston port of the
cylinder
15. Install a tee on the rod port of the cylinder
16. Connect a hose from the one leg of the tee located on the rod port to the “B” port of the
directional control valve
17. Install a portable pressure gauge on the other leg of the tee located on the rod port of the
cylinder
Centennial College: Paul Bligdon
Page 3
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Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 18. Connect a hose from the “T” port of the directional control valve to the return manifold block.
Note:
Observe the ANSI symbol located on the bench which depicts the function of the
directional control valve.
“A” This position directs the pump’s flow through the DCV from “
P
” port to the “
A
” port. The flow then travels to the piston port of the
cylinder allowing the cylinder to Advance.
The flow returning from the rod side of the cylinder returns through the DCV from “B” to
“T” port. The solenoid that shifts the DCV to this position is called the “A” solenoid.
“B” This position directs the pump’s flow through the DCV from “
P
” port to the “B
A
” port. The flow then travels to the rod port of the cylinder allowing the cylinder to return Back
. The flow returning from the rod side of the cylinder returns through the DCV from “B” to
“T” port. The solenoid that shifts the DCV to this position is called the “B” solenoid.
The center position
of the DCV has all of the ports blocked
allowing the cylinder to be stopped at any position in its travel. To
achieve the Center Position de-energized both solenoids and the centering springs will shift the DCV to it center position “A” position
“B” position
Center Position
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 20. Turn the power distribution panels electrical disconnect switch to the “on” position.
21. Release the emergency stop push button
22. Ensure that the pressure compensator’s vent handle is in the passing position (horizontal)
23. Depress the training bench start button.
24. Turn the pressure compensator vent handle to the non-passing position.(vertical)
25. Using the solenoid selector switch; turn the selector to the “A” position, and observe if the
cylinder rod Advanced.
26. Using the solenoid selector switch; turn the selector to the “B” position, and observe if the
cylinder rod came Back
27. Return the selector switch to its middle position.
28. Advance the cylinder rod; however this time, return the selector switch to its middle position
several times while the cylinder rod’s is advancing. 29. Repeat this same step (29), only this time during the cylinder rod retract cycle.
30. Place your observations into the table below.
Centennial College: Paul Bligdon
Page 5
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro Solenoid Selector
Position
Record the DCV flow paths
( ie: P - A and B - T)
Cylinder Motion
“A”
Pressure comes to our circuit from A port
Extending
“B”
Pressure comes back to the tank
Retracting
Center There is no movement in this situation
Nothing
31. With the cylinder rod positioned half way out and the selector switch in the middle position,
manually try to push the cylinder back into the cylinder.
32. Depress the training bench “off” push button.
33. Depress the emergency stop button.
34. Turn the power distribution panels electrical disconnect switch to the “off” position.
35. Transfer all four hoses connected to the solenoid directional control valve to the same ports on
the manually operated directional control valve.
36. Using the DCV lever; position the DCV in its “A” position, and observe if the cylinder rod
Advanced. Note
: the lever must be held in that position for the cylinder to continue its
motion
37. Using the DCV lever; position the DCV in its “A” position “B” position, and observe if the
cylinder rod came Back.
Note
: the lever must be held in that position for the cylinder
to continue its motion
38. Release the DCV lever and the centering springs will place the valve in its middle position
switch to its middle position.
Centennial College: Paul Bligdon
Page 6
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Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 39. Advance the cylinder rod; however this time, release the lever which will return the valve to its
middle position several times while the cylinder rod’s is advancing. 40. Repeat this same step (39), only this time during the cylinder rod retract cycle.Place your
observations into the table below.
Lever Position
Record the DCV flow paths
( ie: P - A and B - T)
Cylinder Motion
“A”
The pressure comes to our circuit from A port
Extending
“B”
The pressure goes back to the tank Retracting
Center The cylinder is extending by lower speed because
all the ports are connected together.
Extending
41. With the cylinder rod positioned half way out and the lever in the middle position, manually try
to push the cylinder back into the cylinder.
42. Retract the cylinder rod.
43. Depress the training bench “off” push button.
44. Depress the emergency stop button.
45. Turn the power distribution panels electrical disconnect switch to the “off” position
46. Remove all hydraulic hoses, tees and gauges from the training bench and return them to their
storage area.
Centennial College: Paul Bligdon
Page 7
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro Review Questions.
1.
Describe the solenoid directional control valve used in this circuit.
Position
Way
Activated
Centered
Center Condition
2.
Describe the manual directional control valve used in this circuit.
Position
Way
Operated
Centered
Center Condition
3.
The traditional naming convention for solenoids Sol A is derived from the following:
a.
Identifies which solenoid when energized places the tank port connected to the A
cylinder b.
Identifying which solenoid when energized places the pressure port connected to
the A cylinder
c.
Sol A is always on the right side of the valve
d.
It doesn’t matter
Centennial College: Paul Bligdon
Page 8
When answering the review questions always refer to the ANSI schematic drawing for the lab and observation recorded in the table to assist you in answering the questions
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 4.
When connecting the cylinder to a solenoid activated, spring centered, 3 position, 4 way
directional control valve, convention has it that.
a.
Energizing Sol A will retract the cylinder
b.
De-energizing both Solenoids will retract the cylinder
c.
Energizing Solenoid B will retract the cylinder
d.
Centering springs will always retract the cylinder 5.
With both solenoids de-energized, which internal component of the DCV returns the spool to its
center condition
a.
The lands on the spool
b.
The undercut area of the spool
c.
The armature of the solenoid valve
d.
The centering springs
6.
With both solenoids de-energized, what determined the pressure indicated on the system pressure
gauge
a.
Pumps delivery (GPM)
b.
The relief valve
c.
The size of the ports on the DCV
d.
The resistance created by the hydraulic circuit
7.
You are asked to troubleshoot a problem in the hydraulic circuit. The electrician states that the
DCV will not shift to retract the cylinder and ask you to determine if problem is electrical or
mechanical. What simple procedure will identify if the valve has an electrical or internal
mechanical problem.
a.
Observe the vacuum reading indicated on the vacuum gauge
b.
Observe the pressure on the system pressure gauge
c.
De-energize both solenoids and try to move the cylinder using the manual override push
pin
d.
Disconnect the hoses from the cylinder and manual extend and retract the cylinder
8.
You identified in question 8 that the problem is electrical because the valve shifted when the
manual over ride push pin were depressed. What electrical problem could have occurred to the
valve? a.
Both solenoids were energized at the same time
b.
The retract solenoid (B) has failed
c.
The electrician was energizing the wrong DCV
d.
All of the above
Centennial College: Paul Bligdon
Page 9
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Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 9.
The engineer identifies that the hydraulic circuit using the all port blocked DCV creates a lot of heat
and waste HP when the valve is in the Center Condition. What change would you recommend to
the valve? a.
Replace the valve spool with a tandem center spool
b.
Replace the valve spool with an open center spool
c.
Replace the valve spool with a float center spool
d.
Any of the above spools
10.
The maximum
flow rate (GPM) through a DCV is determined by:
a.
The size of the inlet and outlet hoses
b.
The port size of the valve and the spool undercut diameter
c.
The GPM supplied to the valve by the pump
d.
All of the above
11.
What are the three functions of the balancing grooves machined on the lands of a hydraulic spool?
a.
b.
c.
12.
Why are all 33 different center condition valves spools interchangeable within a common valve
body?
a.
The undercut diameters are the same
b.
The land diameters are the same
c.
Their maximum flow rates are the same
d.
All of the above
13.
Maintenance is reporting that the Air Gap solenoids are failing frequently on the shop floor. What
component change or system adjustment would you recommend?
a.
Reduce the system operating pressure
b.
Increase the size of the reservoir to dissipate more heat from the fluid
c.
Install a heat exchanger (cooler)
d.
Replace air gap solenoids with wet pin armature solenoids
14.
Draw the ANSI symbol for a 3 position, 4 way, manually operated, spring centered. With open
center condition
Centennial College: Paul Bligdon
Page 10
Industrial Hydraulics for Colleges Industrial Hydraulics for Colleges Intro Intro 15.
Draw the hydraulic schematic of the lab circuit which used the solenoid operated
directional control valve.
ANSI Schematic Drawing
Centennial College: Paul Bligdon
Page 11
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Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
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Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
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Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
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Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY