Introduction to Pneumatic Circuit


These are collection of articles that explains and demonstrate the basic pneumatic circuits.

The blog discussed the basic controller for the single or double-acting cylinder.

Overview: When the directional control valve is pushed, it flips to the open position, conveying the operating source to the cylinder volume. The piston moves forward as a result of this. When the push button is removed, the valve's reset spring returns the valve to its starting position [closed]. The cylinder space is linked to the exhaust port, and the piston retracts as a result of spring or supply pressure applied from the opposite port.

The blog discussed the indirect control for the single or double-acting cylinder.

Overview: This circuit is best suited for large single cylinders and high-speed cylinders. The final control valve is a typically closed 3/2 way directional valve with a push button that can handle a significant amount of air. When the PB1 button is pressed, the 3/2 way DCV with push button switches from a typically closed to an open state, actuating the final control element (DCv1) located between the cylinder and the PB1. When the push button is depressed, the actuation at DCV1 is deactivated, and the DCV1 returns to its starting state. The needed signal pressure might range between 1 and 1.5 bar. The working pressure passing through the final control valve is determined by the force required, which is typically 4-6 bar. Indirect control because it allows for the processing of input signals. Single pilot operated valves are rarely utilized in applications where the piston must retract immediately once the pilot signal is removed.

The blog discussed the basic implementation of AND and OR logic in pneumatic system.

Overview: A dual pressure valve in pneumatic AND logic requires two pressurized inputs to allow an output from itself. It is an interlock control, which means it can only activate when a pair of conditions are met. A typical example is a pneumatic system that only operates when the safety door is closed and the manual control valve is turned on. Only when both control valves are opened will the flow passage open. OR logic, on the other hand, enables only one activation condition to be active. When either actuation mechanism is linked to a shuttle valve, the cylinder extends when one of the actuations is activated. An example of remote control of a pneumatic circuit is OR logic, in which a push button can be either local to the system or distant in the control room.

The blog discussed the basic implementation of memory circuit and speed control in pneumatic system.

Overview: The required memory function was defined by the 5/2-way directional valve with double piloted. Until an opposing signal is received, the valve remains in its last switched position. This property is unaffected by the time period over which the signal is applied to the switching valve. The one-way flow control valves, which are independently adjustable, control the cylinder speed in both directions. This is an exhaust air flow control because the displaced air flow is regulated in each scenario.

The blog discussed the basic implementation of dependent control in pneumatic system, specifically time and pressure dependent systems.

Overview: A time delay valve is a pneumatically actuated 3/2 way direction control valve, an air accumulator, and a one-way flow control valve combined. The time delay function allows you to adjust the rate of air flow to and from the reservoir using a throttle valve. The throttle valve can be fine-tuned to manage the time delay between the minimum and maximum times. Time-delay valves in pneumatic range from 5 to 30 seconds. Pressure sequence valves, on the other hand, provide a pneumatic signal when the reference or set pressure value is reached. Its output signal controls cylinder motion by setting or resetting a signal through the final control valve (5/2 way DCV).

The blog discussed on how to implement a controller for multiple pneumatic actuators.

Overview: We talk about how we correctly assigned the sensors of many actuators to get the right response. The usage of numerous actuators has more practical benefits than drawbacks. The location of each sensor in the circuit impacts how well the circuit responds to the problem or circumstance. Overlapping signals cause the circuit to either not function or to function erroneously. We used mechanical sensors via limit switches in the article, but there are other sorts of sensors that can be used. Assigning sensors can be challenging if the mechanism is not thoroughly understood. The most important thing to keep in mind while sequencing several actuators is to define the sequence of operation.


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