The document discusses various types of pneumatic circuits used to control single and double acting cylinders. It provides examples of circuits that use push buttons or roller levers to start and stop the operation of clamping cylinders for applications like clamping a workpiece or drilling machine. The examples demonstrate how to identify the type of cylinder, suitable control valve, and methods for starting and stopping the cylinder movement based on the specific application.

2.  Based on :
◦ Understanding the problem by considering type
and quantity of components
◦ Number of process*
* Each process is represented by one cylinder
(actuator)

3.  Understand the problem step by step:
◦ Identify type of cylinder
◦ Identify the right control valve for selected
cylinder
◦ Identify methods to start the operation
◦ Identify methods to stop the operation
◦ Identify other parameters (if needed)

4. SINGLE ACTUATOR
CIRCUITS

6.  Actuated directly via mechanical valve, without
intermediate switching
 Limits: 1) Piston diameter < 40 mm
2) Valve with connection size < 1/4”
 If not mentioned, use indirect control
 Example:
A single cylinder of 25 mm in diameter is to clamp a
component when a push button is pressed. As push
button is activated, the cylinder is to remain in the
clamp position. If the push button is released, the
clamp is to retract.

7.  Solution:
◦ Identify type of cylinder
 Single acting with spring return
◦ Identify right control valve for selected cylinder
 3/2 way valve (for single acting)
◦ Identify methods to start the operation
 Push button (3/2 way with spring)
◦ Identify methods to stop the operation
 Push button (release the start button)
◦ Identify others parameter (if needed)
 NIL

9.  Used when the force should prove too high for
manual actuation of valve (for large piston diameter)
Signal is generated via smaller valve
 Example:
A single cylinder with a large piston diameter, is to
clamp a workpiece following actuation of a push
button. The cylinder is retract once the push button
is released.

11.  Solution:
◦ Identify type of cylinder
 Single acting with spring return
◦ Identify right control valve for selected cylinder
 3/2 way valve (for single acting)
◦ Identify methods to start the operation
 Push button (3/2 way with spring) activate
control valve
◦ Identify methods to stop the operation
 Push button (release the start button)
◦ Identify others parameter (if needed)
 NIL

14.  Example
◦ A double acting cylinder is to advance if one of two
push buttons is operated. If the push button is
released, the cylinder is to retract.

17.  Example
◦ The piston rod of DAC is to advance when the 3/2-
way roller lever valve AND the push button of 3/2-
way valve are actuated. If either of these are
released, then the cylinder will return to its initial
position.

20.  Example
◦ Clamping of a drilling machine starts when one of
two push buttons is pressed and it is released
when the third push button is pressed.
◦ Parameters
 There is no clamping if the workpiece is not in the
position.
 Clamping device cannot be opened during the
drilling in operation.
 Clamping process must be performed slowly.
 Clamp opening must be performed rapidly.

21. F=0
4 2
5
1
3
1 1
2
1 1
2
2
1 3
WS
2
1 3
2
1 3
1 1
2
2
1 3
2
1 3
DS
F=0
2
1 3
DS
WS
35%
1
2
3
Start A Start B
St op Drill Sensor
Workpiece Sensor
DRILL M/C
CLAMP M/C