// Catalogue

Hazardous Area Valves, IECEx and ATEX Certified Valves and Coils

Hazardous area valves are built and certified so they cannot ignite flammable gas, vapour or dust around them. TSA Hydraulics Engineering supplies them within the Servo & Proportional family of our Valves range, as complete valves and as certified coils for hydraulic and pneumatic circuits.

In Australia, the marking that usually matters is IECEx or ANZEx to the AS/NZS 60079 series, not ATEX alone. A valve with only an ATEX certificate may not be accepted on your site. Send us the zone, gas or dust group, temperature class and the existing marking string. We will match a genuine certified valve or a properly certified equivalent.

// Buying guide

Zones, Groups and Temperature Classes

Gas zones: Zone 0 (gas present most of the time), Zone 1 (gas likely in normal operation) and Zone 2 (gas unlikely, and only briefly).
Dust zones: Zones 20, 21 and 22, with the same idea applied to combustible dust.
Gas groups: IIA, IIB and IIC, with IIC the most easily ignited, such as hydrogen. Group I covers underground coal mines.
Temperature class: T1 to T6, the highest surface temperature allowed. T6 is the coolest.

The valve’s marking must cover your zone, group and temperature class, or better.

How Valves Are Made Safe

Flameproof (Ex d): the coil housing contains any internal ignition, so it cannot escape.
Increased safety (Ex e): designed so sparks and hot spots cannot occur.
Encapsulated (Ex m): the coil is sealed in resin, keeping gas away from the electrics.
Intrinsically safe (Ex i): very low power coils used with safety barriers, so there is never enough energy to ignite gas.

Non electrical parts matter too. Valve bodies and actuators also need an ignition risk assessment for use in hazardous areas.

The Air Pilot Option

Sometimes the simplest answer is to take the electrics out of the hazardous area altogether. An air piloted valve, switched by a signal from a safe area, needs no coil at the valve. Simple pneumatic logic can then handle interlocks and sequences on site.

Where They Work

Underground and open cut mines
Fuel depots, refineries and gas plants
Chemical and pharmaceutical plants handling solvents
Paint booths and spray lines
Grain, flour and sugar handling, where dust can explode

Ordering a Replacement

Read the full marking string from the old valve or coil, such as Ex db IIC T4 Gb.
Note the certificate number and the scheme, such as IECEx or ANZEx.
Check the supply voltage and the cable entry thread.
Confirm the valve function, size and port details, as for any other valve.

Always have your site’s hazardous area engineer approve the replacement before it is fitted.

Hazardous Area Valves Specifications to Check

Certification scheme and certificate number
Protection type, such as Ex d, Ex e, Ex m or Ex i
Zone, gas or dust group, and temperature class
Coil voltage, power and cable entry
Valve function, size and pressure rating
Ambient temperature range

Why Buy From TSA Hydraulics Engineering

As a hazardous area valves supplier, we match the certification and marking first and then the valve, so the replacement is legal on your site as well as functional. You get OEM or equivalent options with proper certification, and help sourcing hazardous area valves replacement parts such as certified coils, cable glands and seal kits. We tell you upfront whether a valve is genuine or an equivalent.

// FAQs