A pneumatic circuit is a circuit that uses a gas, typically air, as a power source. Its essential components are a motor, which converts electrical energy into rotational mechanical energy, and a compressor, which takes air from the atmosphere and compresses, or squeezes, it into a storage tank.
Logical AND Controls
Pneumatic circuits are inherently safe, but you still need to observe safety precautions when handling compressed air. Logical AND controls -- which operate only if two conditions are true -- can ensure that guards are in position before the circuit is switched on or prevent the circuit from being switched on accidentally.
For the sake of safety, pneumatic circuits are equipped with a pressure switch, which detects the presence of air in the storage tank, a safety valve and a needle valve, which cuts off the supply of air to the circuit. Always close the needle valve on the manifold before attempting to work on a pneumatic circuit.
General safety advice when working on pneumatic circuits is always to wear safety glasses or goggles. Similarly, keep body parts, clothing and other loose items well away from air cylinders.
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