Certified Flanged Ball Valves per DIN & ASME for Industrial Plants

Flanged ball valves are frequently used in industry and pipeline construction due to their robust connection, tightness, and ease of operation. The flange connections have standardized flange dimensions and can be easily mounted with bolts and nuts. Thanks to the simple assembly and disassembly, they are known as a maintenance-friendly connection type in pipelines.

Whether stainless steel, cast iron (GG25 or GGG40), or cast steel (WCB), we offer flanged ball valves in a variety of materials suitable for a wide range of liquids and gases. We supply them in pressure ratings according to DIN standards PN10/PN16/PN25/PN40, but also to ASME Class 150/Class 300. In addition to 2-way valves, we are also specialized in 3-way flanged ball valves that can be used for mixing and diverting.

We also understand your automation needs and deliver the flanged ball valves with electric and pneumatic actuators completely ready for operation. Additionally, we take care of control accessories such as solenoid valves, limit switch boxes, position sensors, positioners, and mounting accessories like spindle extensions, mounting brackets, and more.

Do you have a potable water or gas pipeline and wonder where to find the right valve? You need not look further, as the flanged ball valves with DVGW gas or potable water approval are also available from our stock. If you cannot find what you are looking for, do not hesitate to send us a message, as we also offer special ball valves designed for the correct process parameters.

Compact Ball Valve: Small Valve, Big Performance

Compact ball valves are characterized by their shorter face-to-face length. They are very practical in systems with limited space. Despite their small size, they offer high and stable performance and are particularly important in ships and maritime applications, in the petrochemical and oil industry, in HVAC systems, and various industrial applications.

For various application areas and media, we offer these short-pattern ball valves in stainless steel and cast steel in the nominal sizes DN15 – DN100. Since we have a large selection of DVGW ball valves in stock, we also supply these compact valves for water and gas applications. Automated actuation with electric and pneumatic actuators is, of course, no problem, as we can deliver these in the shortest time. Furthermore, we also offer 3-way compact ball valves and compact ball valves with heating jackets.

Flanged ball valve made of stainless steel, cast steel, and ductile iron with pneumatic or electric automation option for industrial applications

3-way ball valve with pneumatic or electric actuator – precise flow control for industrial applications

3-Way Ball Valves

Ball Valves DVGW Water & Gas

PFA Ball Valves

Threaded Ball Valves

Weld-on Ball Valves

Pneumatischer-Kugelhahn-einfachwirkend-doppeltwirkend

Pneumatic Ball Valves

Electric Ball Valves

Ball Valve Duplex

PRODUCT CONFIGURATOR

Selection and Mounting of a Flanged Ball Valve: 5 Points

1. Selection of the Right Flanged Ball Valve

The specifications of the flanged ball valve should precisely match the requirements of a pipeline. This starts with the correct flange standard. In Europe, DIN and ASME standard flanges are mostly used. Then, the correct nominal size and pressure class should be in focus. The pressure class determines not only the process pressure but also the dimensions of the flanges, which facilitates mounting to flanges with the same pressure rating. Finally, the material of the flanged ball valve also comes into question. Choosing the right material not only ensures smooth system operation but also helps save money. At Fergo, we offer flanged ball valves in materials such as stainless steel, grey cast iron, ductile iron, cast steel, duplex stainless steel, and other materials, depending on the process requirements.

2. Visual Inspection of the Flange Sealing Surfaces

If a temporary coating is present (e.g., anti-corrosion), clean it with the appropriate cleaning agent. For efficient sealing, the sealing surface should be clean, flat, and undamaged. If necessary, damages should be checked and repaired by a specialist. Bolts, nuts, and washers must be undamaged. Furthermore, special attention should be paid to the threads and the bearing surface.

3. Flange Gasket

Depending on the type of ball valve and the process, a flange gasket may be required. This is particularly important for metal-to-metal sealing flanged ball valves, which are usually not absolutely tight. Any type of adhesive or assembly paste is not required. Depending on the process temperature and medium, a suitable gasket material should be used. For ball valves for high temperatures, for example, a graphite gasket is quite advisable. The gaskets are standardized and have a specific size and pressure rating.

4. Lubrication

To reduce friction, ensure that bolts, nuts, and washers are lubricated with the correct lubricant before assembling them. The lubricant should be applied in a thin layer but must cover all surfaces. The application can be done with a medium-hard brush or sponge.

5. Tightening Torques

The tightening torques specified in the assembly instructions must be observed. The sequence of tightening nuts and bolts is also very important, as it affects the force distribution on the sealing surface.

Frequently Asked Questions – Ball Valves

A ball valve uses a rotating, perforated sphere as its closure element. With a 90° quarter-turn of the handle or actuator, the bore through the ball aligns with the pipeline (fully open) or rotates perpendicular to it (fully closed). This simple, robust design delivers several key advantages:

Bubble-tight sealing – Soft seats (typically PTFE, TFM 1600, EPDM, or FKM) press against the ball to create a leak-free seal, even at high pressures
Minimal flow resistance when open – In full bore designs, the ball bore matches the pipe inner diameter exactly, resulting in virtually zero pressure drop
Fast operation – A single 90° movement opens or closes the valve; switch times of under one second with pneumatic actuation
Long service life – Few moving parts, no packing gland wear during normal ON/OFF operation, low maintenance requirements
Compact and lightweight – Shorter face-to-face dimensions than gate valves or globe valves at equivalent bore sizes

Ball valves are the preferred isolation valve for water, gas, oil, steam (where temperature allows), and a wide range of chemical media. FERGO offers the full range of ball valve types for all industrial connection standards and automation requirements.

FERGO's ball valve range covers 8 subcategories spanning all connection types, actuation modes, and special approvals:

3-Way ball valves – L-bore (diverting) and T-bore (mixing/distributing); flanged and threaded; stainless steel, brass, carbon steel; DN15–DN100 PN10/16/25/40; manual, pneumatic, and electric; TA-Luft, ATEX
Flanged ball valves – DIN PN10/16/25/40, ANSI Class 150, ASME B16.5; stainless steel 1.4408, carbon steel 1.0619, GGG40; TFM 1600 seat; TA-Luft, Fire Safe, ATEX, AD2000-A4; DN15–DN300; manual, pneumatic, electric
Threaded ball valves – ISO 7-1 / Rp (BSP), NPT; stainless steel 1.4408, brass; PTFE/TFM seat; DN8–DN100; manual and automated; DVGW versions available
Weld-on (butt-weld) ball valves – End-to-end butt-weld connection per EN 12627 / ASME B16.25; stainless steel; for high-purity and high-pressure systems where flanged connections are undesirable
Pneumatic ball valves – Double-acting (DA) and single-acting/spring-return (SA: NC or NO); ISO 5211 direct mount; NAMUR solenoid interface; ATEX available; flanged and threaded; DN8–DN300
Electric ball valves – J4C actuator; 24–240 V AC/DC; 20–300 Nm; standard, positioner, battery backup (BSR) variants; ISO 5211; flanged and threaded; PLC/SCADA integration
Ball valves DVGW (water & gas) – DVGW-certified for drinking water and gas to German requirements; GGG40 body with stainless steel ball; PN16; threaded (Rp) and flanged (DIN PN16); TA-Luft
Duplex ball valves – Duplex stainless steel 1.4462 (SAF 2205) or super duplex 1.4410 (SAF 2507) body and ball; for seawater, chloride-bearing media, offshore, and other highly corrosive applications where standard stainless steel is insufficient

Stainless steel ball valves are the standard choice wherever carbon steel or brass reaches its corrosion resistance limits. The key grades in the FERGO range:

1.4408 / AISI 316 / CF8M (V4A) – The most common stainless steel for industrial ball valves. Excellent resistance to corrosion, most acids (except concentrated HCl and HF at high temperatures), seawater, organic compounds, and steam. Suitable for food, pharmaceutical, chemical, and water treatment applications. TFM 1600 seat for temperatures from −29 °C to +175 °C.
1.4301 / AISI 304 / CF8 – Standard austenitic stainless steel; lower molybdenum content than 1.4408; less corrosion-resistant against chlorides but cost-effective for clean water, food, and non-aggressive media where 316 is not required.
1.4571 / AISI 316 Ti – Titanium-stabilised 316; used in high-temperature applications and specific chemical environments requiring resistance to intergranular corrosion.
Duplex 1.4462 / Super Duplex 1.4410 – For the most demanding corrosion conditions: seawater, chloride-rich media, offshore. See our Duplex ball valve range.

When to choose stainless steel over brass:

Corrosive or aggressive media (acids, alkalis, solvents)
Food, beverage, or pharmaceutical applications requiring hygienic surfaces
Outdoor or moist environments where brass dezincification may occur
Steam or high-temperature applications above +150 °C
Where current drinking water regulations restrict copper alloys (e.g., KTW/DVGW)

A 3-way ball valve has three ports and two seats, allowing it to connect multiple pipeline branches. Unlike a standard 2-way ball valve (which is either open or closed), a 3-way valve controls flow direction – making it possible to divert, mix, or distribute media without additional fittings.

The two bore configurations serve fundamentally different purposes:

L-bore (L-port) – The ball bore forms an L-shape. In one position, it connects Port 1 to Port 2 (Port 3 closed); after a 90° turn, it connects Port 1 to Port 3 (Port 2 closed). Use case: diverting – switching a single inlet between two alternative outlets. Example: directing process media alternately to reactor A or reactor B.
T-bore (T-port) – The ball bore forms a T-shape. Depending on position, it can connect all three ports simultaneously, or connect any two of the three. Use case: mixing or full-pass – combining two inlet streams into one outlet, or allowing flow through from any direction. Example: hot/cold water blending, return line switching in heating systems.

FERGO 3-way ball valves are available in stainless steel 1.4408 and brass; flanged (DN15–DN100, PN10/16/25/40) and threaded (¼"–2½"); manual, pneumatic (DA/SA, ATEX), and electric (24–240 V); TA-Luft and ATEX certification. Available in the 3-way ball valve category.

Pneumatic ball valves combine the compact, reliable ball valve with a compressed-air actuator for automated or remote operation. Key selection criteria:

Double-acting (DA) vs. single-acting (SA):
- DA: Air required for both opening and closing – maximum torque in both directions; no defined fail-safe position (valve stays in last position on air failure)
- SA spring-to-close (NC): Air opens the valve; spring returns it to CLOSED on air failure → fail-safe CLOSED. Standard choice for safety shut-off duties
- SA spring-to-open (NO): Air closes the valve; spring returns it to OPEN on air failure → fail-safe OPEN. Used where the pipeline must remain open on loss of control (e.g., cooling water)
Operating pressure: Standard pneumatic actuators operate on 4–8 bar compressed air supply. The actuator size must deliver sufficient torque to overcome the ball valve's operating torque at the minimum available air pressure.
ATEX: For use in hazardous areas (Ex-zones), ATEX-rated actuator and NAMUR solenoid valve combinations are available. Pneumatic actuators are inherently spark-free, making them a natural choice for explosive atmospheres.
Control:NAMUR solenoid valves (3/2-way for SA, 5/2-way for DA) mount directly on the actuator without additional piping, controlled by 24 V DC signal from PLC.
Position feedback: Add a Switchmaster limit switch box (IP67, ATEX) for OPEN/CLOSED confirmation to the control system.

FERGO supplies pneumatic ball valves as pre-assembled, tested valve-and-actuator sets ready for direct installation.

Electric ball valves are the preferred solution where compressed air is not available, or where precise control and easy PLC integration are priorities. FERGO supplies electric ball valves with the J4C actuator series in four variants:

J4C Standard – ON/OFF control via 24–240 V AC/DC signal. Integrated end-stop switches, visual position indicator. Ideal for straightforward remote open/close without intermediate positioning.
J4C Positioner – Adds a 4–20 mA or 0–10 V analogue input for stepless positioning. The valve can be set to any intermediate position between 0° and 90°, enabling continuous flow regulation. Essential for process control loops where partial opening is required.
J4C BSR Battery Backup – On mains power failure, the integrated battery pack automatically drives the valve to the pre-programmed safe position (open or closed). The electrical equivalent of spring-return in a pneumatic actuator.
J4C Positioner + Battery Backup – The complete solution for safety-relevant control loops requiring both continuous positioning and fail-safe operation.

Technical data (all J4C variants): Torque 20–300 Nm; voltage 24 V DC / 110–240 V AC (multi-voltage); ISO 5211 direct mount; compact PA housing; compatible with Switchmaster and inductive sensors for position feedback.

DVGW-certified ball valves carry approval from the German Technical and Scientific Association for Gas and Water (DVGW), confirming that the valve meets the strict material and performance requirements for use in:

Drinking water systems – Materials in contact with drinking water must not negatively affect water quality; DVGW certification confirms compliance with German drinking water regulations (TrinkwV) and KTW guidelines. PTFE/EPDM seat materials; stainless steel or GGG40 body.
Gas installations – DVGW-approved valves confirm suitability for natural gas, biogas, propane, and other flammable gases in low- and medium-pressure networks; TA-Luft emission compliance also typically included.

When is DVGW certification required?

All valves in public or commercial drinking water installations in Germany
All valves in domestic and industrial gas supply lines
Specified in project tenders by German municipal utilities and water authorities

FERGO DVGW ball valves are available in threaded (Rp ½"–Rp 4") and flanged (DN15–DN300, PN16) versions; GGG40 body with stainless steel 1.4304 or 1.4408 ball; manual lever and automated (pneumatic/electric) versions.

Both ball valves and butterfly valves are quarter-turn isolation valves, but they suit different applications. Here is a direct comparison to guide your selection:

Choose a ball valve when:

Full bore is critical – Pig-able pipelines, no restriction to flow, or media containing solids that must pass through freely
Bubble-tight sealing under high pressure – Ball valves seal against hard seat materials (TFM, PTFE) and are leak-free at up to PN40 or ANSI Class 300
Small to medium nominal sizes (DN8–DN150) – Ball valves are cost-competitive at these sizes; at larger DN they become heavy and expensive
Threaded or butt-weld connections – Not available in butterfly valves; ball valves cover all connection types
DVGW-certified applications – Drinking water and gas installations where ball valves are the predominant certified type
3-way mixing or diverting duty – Only available as ball or plug valves, not butterfly

Choose a butterfly valve when:

Large nominal sizes (DN200–DN1200) – Butterfly valves are dramatically more compact, lighter, and cheaper at large DN; a DN600 ball valve is impractical
Space is very limited (short face-to-face) – Wafer butterfly valves require only ~45 mm face-to-face at DN100; equivalent ball valves are 3–4× longer
Lower pressure ratings (PN6–PN16) – Butterfly valves excel at lower pressures; above PN16 the ball valve becomes more suitable
Cost is a primary driver at medium-large sizes – A DN200 butterfly valve costs a fraction of an equivalent ball valve