What do L and S mean on tube connections?

L denotes the light series and S the heavy series. The number is the tube outside diameter in mm and determines the connection thread, for example 12 L with M18x1.5 and 12 S with M20x1.5. Tube ends run from 6 L to 42 L and 6 S to 38 S.

What is the difference between L-port and T-port?

With an L-port, the 3-way ball valve connects the centre port to either of the side ports. A T-port adds positions in which the side ports, or all ports, are connected to each other.

Which operating pressure can I expect?

In steel, G 1/8 to G 1/2 threads and tube connections 8 S to 14 S are rated 0 - 500 bar. Pressure falls with size, for example to 420 bar for G 3/4, G 1 and G 2 in steel or to 50 bar for G 4 in stainless steel.

Are pneumatically actuated high-pressure ball valves available?

Yes, in zinc-plated steel with G 1/4 to G 2 threads, double-acting, spring-closing or spring-opening. A spring-closing valve shuts off if the control air fails, a spring-opening valve opens.

Can I fit replacement handles?

Yes. Straight handles come in aluminium or zinc die-cast, offset handles in steel or zinc die-cast, from SW 9 to SW 17 depending on size. The handle across-flats size must match the valve stem.

Ball valves and actuators

High-pressure ball valves

High-pressure ball valves for lines up to 500 bar: straight-through valves in zinc-plated steel, stainless steel or nickel-plated brass, 3-way ball valves with L-port or T-port and pneumatically actuated versions. Connections are G 1/8 to G 4 and NPT 1/4 to NPT 3 threads or tube connections in the L series (6 L to 42 L) and S series (6 S to 38 S) with metric threads M12x1.5 to M52x2. A gauge shut-off valve G 1/4 and replacement handles complete the range. PVC-U ball valves, 3-piece stainless steel ball valves and DVGW certified versions from Köly are listed in their own categories.

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3-wayFor diverting or distributing flow between separate lines.L-port or T-port 500 barFor lines operating at up to 500 bar.G 1/8 to G 1/2 400 to 420 barFor medium connection sizes in high-pressure circuits.Pressure 420 bar up to G 2 M12x1.5 to M52x2For direct tube connection in the L and S series.Tube 6 L to 42 L, 6 S to 38 S NPT 1/4 to NPT 3For systems piped with tapered NPT threads.Stainless steel and steel ATEXVersions with ATEX certificate, check the zone assignment against the marking.ATEX certificate HydacHigh-pressure ball valves from Hydac for plants standardised on this brand. Köly DeutschlandHigh-pressure ball valves from Köly Deutschland.

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Buying guide

How to choose High-pressure ball valves

What matters when choosing: properties, comparison and typical applications.

Selection criteria

Criterion	Options	What to check
Function	Straight-through ball valve, 3-way with L-port, 3-way with T-port, gauge shut-off valve	Compare the port positions with your circuit diagram.
Connection	Thread G 1/8 to G 4, tube connection 6 L to 42 L and 6 S to 38 S (M12x1.5 to M52x2), NPT 1/4 to NPT 3	For tube connections, match the tube outside diameter and the L or S series to the fitting.
Operating pressure	500 bar, 420 bar, 400 bar, 350 bar, 315 bar, 160 bar, 150 bar, 100 bar, 50 bar	Permissible pressure decreases as size increases. Stainless steel versions are rated from -0.999 bar.
Material	Zinc-plated steel, stainless steel 1.4571 and 1.4404, nickel-plated brass	Choose stainless steel where the medium or environment calls for corrosion protection.
Seals	POM / NBR, PTFE / FKM, PTFE / FKM / POM	Check the seal material against the medium in the data sheet.
Temperature	-20 to +100 °C, -20 to +200 °C	For hotter media choose the stainless steel version rated -20 to +200 °C.
Operation	Straight lever (standard) or offset handle, pneumatic double-acting, spring-closing, spring-opening	An offset handle helps where space beside the line is tight. The spring defines the valve position if the control air fails.

High-pressure ball valves

How to choose High-pressure ball valves

Selection criteria

Frequently asked questions about High-pressure ball valves