standard grade technological studies pneumatic components: five port, two state valves
TRANSCRIPT
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Standard Grade Technological Studies
Pneumatic components:Five port, two state valves
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Problems using 3/2 Valves
• We can control a double acting cylinder with two 3/2 valves.
• It is easy to push or pull the piston.• This is because there is not a constant air supply to
the cylinder• Air is free to escape from a 3/2 valve when it is not
actuated
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Five port, two state Valves
• Also known as a 5/2 valve.
• Has five ports (air connections)
• and two states (operating positions)
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Five port, two state Valves
• Like the 3/2 valve, each port is numbered to help us make the correct connections.
• Port 1 - main air.
• Remember, main air is identified by this symbol.
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Five port, two state Valves
.
• Port 2 - output connection.
• This allows the connection of other components that we wish to control.
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Five port, two state Valves
.
• Port 3 - exhaust.
• As before, the exhaust is identified by this symbol.
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Five port, two state Valves
.
• Port 4 - output connection.
• This allows the connection of other components that we wish to control.
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Five port, two state Valves
.
• Port 5 - exhaust.
• As before, the exhaust is identified by this symbol.
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Five port, two state Valves
• State 1 - instroke
• Air flows from port 1 to port 2, this instrokes the cylinder.
• Air will also flow from port 4 to port 5.
• The diagram shows the flow of air in this state.
1
2
3
4
5
AIR FROMCYLINDER
AIR TOCYLINDER
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Five port, two state Valves
• State 2 - outstroke• This time air flows from port
1 to port 4, making the cylinder outstroke.
• Again air flows from the other output connection, port 2 to the exhaust port 3.
• As before the diagram shows the flow of air in this state.
1
2
3
4
5
AIR FROMCYLINDER
AIR TOCYLINDER
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Pilot air
• 5/2 valves can be actuated in a similar manner to 3/2 valves.• A more common and useful method is to use a Pilot Air Signal.• A pilot air 5/2 valve will change state when a brief air signal acts
at either end of the valve.• This pilot signal is usually provided by using 3/2 valves.
Valve A
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Assignment 6
1. Our car park barrier is gradually improving. The circuit has been changed to look like the one shown previously.
• Build and test the circuit.• Produce a list of all the components used.• Describe how the circuit works
Valve A
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Assignment 6
2. A door entry system is controlled by pneumatics. The system makes use of a double acting cylinder. Part of the circuit diagram is shown.
A
B
C• Name each of the components A, B and C.
• Copy and complete the circuit diagram so that the door will open and close.
• Describe how the circuit operates.