Most of the time a ball valve is a ball valve. You pick the size and thread and move on.
Then you get the industrial jobs. A drain point someone keeps leaving open. An air line that has to be dead before a fitter breaks into it. A hydraulic test rig. A tanker fill point. That's when a standard quarter-turn becomes the weak link.
Zetco's new range includes a handful of special-duty ball valves built for exactly those jobs. None of them are WaterMarked. These are process, industrial and plant valves, not AS/NZS 3500 potable water valves. Here's what each one is for.
Spring Return (Dead Man): Never Left Open
The series 4040 spring return ball valve snaps shut the moment you let go of the handle.
- 316 stainless body and ball, rated 4500 kPa, -20°C to 150°C
- 6–50mm F&F BSP
Use it on tank draw-offs, sample points, drains and wash-down lines, anywhere a valve left open means a flooded floor or an empty tank. If the job has a "someone always leaves it open" problem, this fixes it mechanically, with no sign needed.
Self-Venting: Dead Line Before You Break In
A standard ball valve isolates the supply but traps whatever pressure is downstream. On a compressed air or pneumatic line, that stored pressure is what injures people when a fitting gets cracked.
The series 4045 self-venting ball valve has a vented ball. Close it and it bleeds the downstream side to atmosphere.
- Lockable lever for lock-out/tag-out
- 316 stainless, rated 4500 kPa, 6–50mm
Fit it at the isolation point for air lines feeding tools and machines. Pair it with the site's lock-out procedure and the downstream line is genuinely dead before anyone touches it.
Point the vent somewhere safe. It discharges every time the valve closes.
High Pressure: Up to 50,000 kPa
Standard valves top out around 4000–6300 kPa. The series 4090 high pressure ball valve is a different class.
- 316L stainless steel
- Rated 50,000 kPa in small sizes, stepping down to 35,000 kPa at the large end
- 6–65mm, -30°C to 100°C
It's for hydraulics, high-pressure wash-down, hydrostatic test rigs and process lines. If you're isolating a test pump that's pushing well past normal plumbing pressures, this is the valve that won't be the weak point.
Check the rating for your exact size on Zetco's spec sheet, because it falls as the size goes up.
Camlock: Valve and Hose Coupling in One
The series 4126 camlock ball valve has a female BSP end and an integral camlock coupling on the other.
- Lockable lever, 316 stainless, 4500 kPa
- 25–80mm
It suits tanker fill and draw-off points, transfer pumps, wash-down hoses and temporary dewatering connections. Building it from a valve, nipple and separate camlock adaptor gives you two extra joints and a longer, heavier overhang.
The lockable lever matters on fill points. It stops unauthorised filling or draining when nobody's around.
Stainless Mini: Gauges and Small-Bore Work
The series 1420 stainless mini ball valve is a compact 316 valve from 3mm to 15mm, rated 6300 kPa with Viton/PTFE seals.
Use it for gauge isolation, instrument tappings, drain and vent points, and equipment connections where a full-size valve would overhang and get knocked. If you need fine control rather than on/off, use a needle valve. See our needle valve guide.
Heavy Pattern Bronze: Marine, Fire and Irrigation
Not every tough job calls for stainless. Zetco's heavy pattern bronze ball valves pair a bronze body with a 316 ball and stem:
- Series 1060: lever handle, 6–100mm
- Series 1067: lockable lever, 15–50mm
Both are rated 4000 kPa, -20°C to 120°C. Bronze handles seawater, irrigation and fire service conditions that kill standard brass. They're not WaterMarked, so they're for non-potable services.
The Short Version
- Must never be left open: 4040 spring return
- Air line that must be dead before work: 4045 self-venting
- Hydraulic or test-rig pressures: 4090 high pressure
- Hose or tanker connection: 4126 camlock
- Gauges and instruments: 1420 mini
- Marine, fire or irrigation: 1060 or 1067 heavy bronze
For potable water, use the WaterMarked range instead. See WaterMarked stainless ball valves. Browse everything in the Zetco and ball valves collections.
Frequently Asked Questions
What is a dead man ball valve?
A spring return ball valve that closes automatically when the handle is released. It's used on drains, sample points and draw-offs that must never be left open.
Why use a self-venting ball valve on compressed air?
When it closes it bleeds the downstream pressure to atmosphere. That stops anyone breaking into a line with trapped pressure still in it.
Can I use these special-duty valves on drinking water?
No. Zetco lists them as not WaterMarked, so they're not for installations that must comply with AS/NZS 3500. Use a WaterMarked valve for potable water.
How much pressure can the 4090 handle?
Zetco rates it up to 50,000 kPa in the small sizes, falling to 35,000 kPa at the large end. Check the spec sheet for your exact size.