Hydraulics and Pneumatics Lab

MET230L: Hydraulics and Pneumatics Lab
Unit 2 Lab Assignment 2
Remember to open a new Word file named
MET230L_Unit2_Lab2_LastName_FirstName.doc(x) if you
have not done so yet.
Exercise 1
This exercise illustrates the pneumatic seal-in (a.k.a. latch)
function while controlling a double acting cylinder.
Consider the figure shown.
a. In the simulation software assigned by your instructor,
open a new file named
Unit2_Lab2Ex1_LastName_FirstName
b. Build the circuit using the components shown or their
equivalents
c. Start the simulation by left clicking the start button
circled in red as shown ( ).
d. Left click once on valve M1
 What happen to the cylinder? It extended
 Why? When 3/2-way valve with push button M1 is pressed it activates 3/2-way valve
with push button M2 which in turn activates 3/2-way valve with pneumatically
operated P1 that actuate 5/2-way valve pneumatically operated allowing the
compressed air to flow into the piston via the quick exhaust valve D2.
Figure for Exercise 1
e. Left click once again on valve M1
 What happen to the cylinder? It remained in the extended position
 Why? This is because of the latching effect of the pneumatic seal in function
which was activated previously therefore pressing M1 again does not cause
any changes.
f. Left click once on valve M2
 What happen to the cylinder? It retracts
 Why? The latching function is inactivated when valve M2 is clicked,
triggering retraction.
g. Why do valves P1 and P2 remain actuated when M1 returns to its unactuated position
after being momentarily actuated?
 This is due to the latching function that results when the shuttle valve prevent the
backflow of compressed air even after M1 is unactuated leaving P1 and P2
actuated.
h. Take a screen shot of the working simulated circuit, copy and paste in the word document
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i. Save the simulation and word files
Exercise 2
On your own, modify the circuit of Exercise 1 to control a single acting cylinder using a
pneumatic seal-in circuit.
a. In the simulation software assigned by your instructor, open a new file named
Unit2_Lab2Ex2_LastName_FirstName
b. Build and modify the circuit of exercise 1, shown again here, by
 Getting rid (removing) the directional control valve P2
 Replacing the double acting cylinder C1 by a single acting cylinder
 Positioning the flow control valve F1 so that it controls the outward (extension)
stroke
c. Start the simulation by left clicking the start button circled here in red as shown ( ).
d. Left click once on valve M1
 What happen to the cylinder? It extends
e. Left click once on valve M2
 What happen to the cylinder? It retracts
f. Setting the opening of F1 valve to 10% , left click once the valve M1 and observe the
speed of the cylinder extension stroke
 Does it increase or decrease? The extension stroke speed decreases
g. Take a screen shot of the working simulated circuit, copy and paste in the word document
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h. Save the simulation and word files
Figure for Exercise 2
MET320L U2Lab2 Page - 3 -

Exercise 3
Consider the figure shown.
a. Give the complete name of the component M3. This should include its mode of actuation.
3/2-way idle return roller valve
b. In less than three line, briefly describe how it (M3) works
It is actuated when the roller lever is traversed by the cam of a cylinder in a certain
direction and after release of the roller lever, the valve is returned to its initial position
by a return spring. (Festo, 2019)
c. In the simulation software assigned by your instructor, open a new file named
Unit2_Lab2Ex3_LastName_FirstName
d. Build the circuit using the components shown or their equivalents
e. Start the simulation by left clicking the start button circled here in red as shown ( ).
f. Set the opening of valve F1 and valve F2 to 10%
g. Left click once on valve M1
 What happens to the cylinder rod? It extends
h. Left click once on valve M2
 What happen to the cylinder rod? It retracts
i. Left click once again on valve M1 and as the rod still extends, left click on valve M2
 What happens to the cylinder rod? It retracts immediately.
 Why? On clicking M2 it unactuate P1 instantly leading to immediate
retraction.
j. Looking to the diagram, what are the two valves that need to be simultaneously actuated
for the rod to start extending?
 Valve M3 and valve P1
k. Take a screen shot of the working simulated circuit, copy and paste in the word document
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