What is the difference between a 3/2 and a 5/2 valve?

A 3/2 valve has three ports and two positions and controls a single-acting cylinder, feeding air to extend it and exhausting so the spring returns it. A 5/2 valve has five ports and two positions and controls a double-acting cylinder, feeding air to one side while exhausting the other, then switching to reverse the supply so the cylinder both extends and retracts under air.

How do you calculate the force from a pneumatic cylinder?

Use force equals pressure times area (F = pA), with pressure in pascals and the piston area in square metres giving the force in newtons. A larger piston area or a higher air pressure gives a larger force, which is how a small compressed-air supply can move heavy loads. Pressure itself is force divided by area.

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Pneumatic systems and control: study guide - CCEA GCSE Technology and Design

Q: What does the Pneumatic systems and control topic cover?

It covers the compressed-air supply (compressor, receiver and regulator), single-acting and double-acting cylinders and how each returns, the output force of a cylinder from force equals pressure times area, directional control valves named by ports and positions (3/2 for a single-acting cylinder, 5/2 for a double-acting cylinder), the ways valves are operated, and controlling cylinder speed with a flow-restriction valve.

A study guide to pneumatic systems and control in CCEA GCSE Technology and Design: the compressed-air supply, single and double-acting cylinders, the force equation force equals pressure times area, directional control valves (3/2 and 5/2), and controlling cylinder speed.

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What this topic covers
How it is examined
Key ideas to recall
How to revise it

Pneumatic systems and control use compressed air to create movement and force. It is part of Unit 1 and is extended in the mechanical and pneumatic option of Unit 2.

What this topic covers

Pneumatic components and cylinders - the air supply, single and double-acting cylinders, and the force equation $F = pA$ .
Pneumatic circuits and control - 3/2 and 5/2 directional control valves, ways of operating valves, and speed control.

How it is examined

Expect questions that ask you to distinguish single-acting from double-acting cylinders, calculate the force from pressure and area, name and explain the 3/2 and 5/2 valves, match a valve to a cylinder, describe how valves are operated, and explain how cylinder speed is controlled. Show working in calculations for the method marks.

Key ideas to recall

Pneumatics uses compressed air (compressor, receiver, regulator, valves, cylinder).
Single-acting: air one way, spring return. Double-acting: air both ways.
Force: $F = p \times A$ (pascals and square metres give newtons).
3/2 valve for a single-acting cylinder; 5/2 valve for a double-acting cylinder.
Speed is set with a flow-restriction valve, not by changing the pressure.

How to revise it

Learn the cylinder types. Single-acting (spring return) versus double-acting (air both ways).
Drill the force equation. Practise $F = pA$ with correct units.
Match valve to cylinder. 3/2 for single-acting, 5/2 for double-acting, and know why.
Know the operating methods. Hand, mechanical, pilot (air) and solenoid (electrical).
Separate speed from force. Speed is set by a flow-control valve; force depends on pressure and area.

Sources & how we know this

CCEA GCSE Technology and Design specification — CCEA (2017)