How does a pneumatic sequential circuit work with multiple actuators?

How does a pneumatic sequential circuit work with multiple actuators?

• A. Uses cascade or pilot logic to sequence actuations
• B. All actuators operate in parallel
• C. It relies on a single valve
• D. It uses a continuous pressure source

Answer: (A)

Sequencing multiple pneumatic actuators relies on signals that control the order of actions, so one device finishes its move before the next starts. This is achieved with cascade or pilot logic. In cascade logic, the circuit is arranged in stages with inter-stage pressure relations and valves that only allow the next actuator to receive pressure after the previous stage reaches its end position. In pilot logic, small pilot signals—often from the end-of-stroke switches or from the output of a preceding actuator—control pilot valves that gate the next actuator’s flow. Either approach creates a defined, step-by-step sequence rather than all actuators moving at once. If all actuators operated in parallel, they would move together, lacking order. Relying on a single valve wouldn’t coordinate multiple actuators, so you wouldn’t get a controlled sequence. A continuous pressure source by itself also doesn’t enforce an order; it would push components as long as pressure is available, unless the sequence logic actively gates the later actions.

Sequencing multiple pneumatic actuators relies on signals that control the order of actions, so one device finishes its move before the next starts. This is achieved with cascade or pilot logic. In cascade logic, the circuit is arranged in stages with inter-stage pressure relations and valves that only allow the next actuator to receive pressure after the previous stage reaches its end position. In pilot logic, small pilot signals—often from the end-of-stroke switches or from the output of a preceding actuator—control pilot valves that gate the next actuator’s flow. Either approach creates a defined, step-by-step sequence rather than all actuators moving at once.

If all actuators operated in parallel, they would move together, lacking order. Relying on a single valve wouldn’t coordinate multiple actuators, so you wouldn’t get a controlled sequence. A continuous pressure source by itself also doesn’t enforce an order; it would push components as long as pressure is available, unless the sequence logic actively gates the later actions.