Logic Circuit Simulation

Learn some different logic control circuit options

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This module allows you to test a range of different logic circuit layouts to see what can be achieved. This shows typical directional functions being achieved with seated logic valves being controlled by a solenoid pilot valve.

Experiment with logic control circuits

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Simple logic valve circuits

1 Logic valves are 2-way directional valves, often with positive leak free seats.

2 Operating the logic valves with a separate pilot circuit offers a wide range of opportunities for individual circuit control sequences.

3 Often logic valves are used when the flow rates are too high for conventional spool type directional valves.

4 They are also necessary when leak-free operation is required.

5 The circuit design in this module is equivalent to a 4-way directional valve.

6 Click the pilot valve's solenoid on the left-hand side to activate the logic valves.

7 You can drag and drop each valve, pilot or pipe to design and test your own circuit layouts.

Single line logic safety circuits

11 Logic elements can be used to isolate individual pipelines.

12 This type of line isolation can be useful for safety circuit design.

13 Logics are sometimes used in a sandwich plate, below a proportional valve, to isolate the cylinder in the event of a control signal failure.

Freewheel or actuator bypass circuits

21 Connecting a logic element between pipelines can be used to equalise the pressure and prevent an actuator from moving.

22 This system is sometimes used to allow motors to freewheel.

Regenerative cylinder circuits

31 Regenerative circuits feed the annulus flow back into the bore side of the cylinder and therefore increase the cylinder speed while extending.

32 Regeneration can be achieved with logic elements as shown, although it is also commonly achieved using a pressure regulating or check valves.

33 In this version, you need to click the pilot valve's solenoid to switch the regenerative circuit in or out.

Relief reducing valves give proportional control

41 In some situations pressure relieving, reducing valves can be used to provide directional control.

42 If you can regulate the pilot pressure signal then a simple proportional control system is possible.

Relief vavles give acceleration control

51 Pilot operated pressure relief valves can also be used to provide a simple directional control system.

52 Pilot response rates can also be controlled to facilitate ramped acceleration and deceleration.

Design your own logic circuits

Experiment by designing your own logic element circuits.