3-38.
The following statements concern
the operation of the
counterbalance valve shown in
figure 6-20 of your textbook.
Mark each statement true of
false, then select the
alternative below that lists
those that are true.
A.The main valve has equal
surfaces which are the inner
areas of the spool.
The activation of the valve
B.
results from the applied
pressure opening the check
valve, allowing the fluid to
bypass the main valve.
C. Reverse action of the valve
is controlled by the
pressure required to
overcome the spring tension
of a check valve.
D. The weight supported by the
valve depends upon the
spring tension on the spool.
1.
A, B, C
2.
A, C, D
3.
B, C, D
4. A, D
Learning Objective:
Recognize
construction features, operating
characteristics, and uses of
various types of directional
control valves.
3-39.
A poppet is used as the valving
element for which of the
following fluid power valve
applications?
1.
Flow control
2.
Pressure control
3.
Directional control
4.
All of the above
3-40.
What type of valving element is
most commonly used in directional
control applications?
3-41.
Check valves usually contain what
types of valving elements?
1.
Ball and cone
2.
Ball and poppet
3.
Sleeve and poppet
4.
Rotary spool and sliding
spool
3-42.
What type of check valve permits
free flow of fluid in one
direction and a limited flow of
fluid in the opposite direction?
1.
Orifice
2.
Vertical
3.
Swing
4.
Ball
3-43.
Refer to figure 6-25 in your
textbook.
Force caused by which
of the following plays no part in
the opening and closing of this
valve?
1.
Gravity
2.
Spring action
3.
Backflow of fluid
4.
Forward flow of fluid
3-44.
Refer to figure 6-27 in your
textbook.
If normal system inlet
pressure is lost, when the
alternate system is activated,
its pressure will cause the
shuttle to move sufficiently to
1.
close the outlet port to
prevent reverse flow from the
outlet port to the normal
system inlet
2.
close the outlet port and
connect the normal system
inlet to the alternate system
inlet
3.
apply the alternate system
pressure to both the outlet
port and the normal system
4.
close the normal system inlet
to prevent loss of alternate
system pressure
1.
Ball
2.
Poppet
3.
Rotary spool
4.
Sliding spool
20