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5/2 Way Valves, the Workhorse of Pneumatic Automation

5/2 way valves have five ports and two positions. They drive a double-acting air cylinder out and back, with a separate exhaust for each stroke. TSA Hydraulics Engineering supplies them within the Directional Control family of our Valves range, for automation, packaging and process plants.

These days, most 5/2 valves plug into a base, a manifold or a valve island, and the base decides what fits. An ISO 5599 valve swaps between makers, while a valve island module usually only fits its own family. Send the valve and base codes, and we will match a genuine module or an equivalent that seats properly.

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// Buying guide

How a 5/2 Way Valve Works

Pneumatic ports follow ISO 5599 numbering:

Port 1: air supply
Ports 2 and 4: outlets to each end of the cylinder
Ports 3 and 5: exhausts, one for each outlet
Ports 12 and 14: pilot signals that shift the valve

In one position, port 1 feeds port 4 and port 2 exhausts through port 3. In the other, port 1 feeds port 2 and port 4 exhausts through port 5.

Why Two Exhausts Matter

A 4/2 valve shares one exhaust between both cylinder ends, while a 5/2 valve gives each end its own. That means you can fit a different speed controller or silencer on each exhaust, so the extend and retract strokes can run at different speeds. It is the main reason 5/2 valves dominate air circuits.

Single Solenoid, Double Solenoid or Air Pilot?

Single solenoid (monostable): a spring or air spring returns the valve when the coil switches off, so the cylinder goes back to a known position.
Double solenoid (bistable): one coil for each direction. The valve stays where it was last switched, even after a power cut.
Air pilot: shifted by an air signal instead of a coil. This is ideal for wet or hazardous areas where electrics are a problem.

Choose the behaviour you want if power or air is lost part way through a cycle.

Mounting Styles

Inline ported: threaded ports, such as G1/8 or G1/4, on the valve body.
ISO 5599 sub base: standard bolt patterns in sizes 1, 2 and 3, interchangeable between makers.
ISO 15407: smaller standard bases, common in 18 mm and 26 mm widths.
NAMUR: bolts directly onto quarter turn actuators.
Valve islands and modular systems: many valves on one manifold, often with a fieldbus or Ethernet connection to the PLC.

Keep the Air Clean and Dry

Fit a filter regulator ahead of the valves, set to the pressure the machine needs.
Drain the water from filters regularly.
Decide on lubrication and stick with it. Once a valve has run on lubricated air, it usually needs lubricated air from then on.

Dirty or wet air is the most common reason a 5/2 valve sticks or leaks to exhaust.

Where 5/2 Way Valves Work

Packaging, filling and labelling lines
Pick and place and assembly automation
Doors, gates and guards on machines
Double acting actuators on process valves
Food and beverage plants, often with stainless or washdown rated islands

If the cylinder must stop and hold part way, use a 5/3 way valve instead.

5/2 Way Valves Specifications to Check

Mounting: inline ports, ISO 5599 size, ISO 15407, NAMUR or island type
Monostable or bistable, and the return type
Coil voltage, connector and power rating
Flow rate, often shown as Cv or l/min
Operating pressure range and lubrication

Why Buy From TSA Hydraulics Engineering

As a 5/2 way valves supplier, we match the base or island type, the coil and the behaviour, not just the port count. You get OEM or equivalent options, and help sourcing 5/2 way valves replacement parts such as coils, seals and blanking plates. We tell you upfront whether a valve is genuine or an equivalent.

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