Industrial Ball Valves:
The Complete Guide
for Plant Engineering & Process Industry
From chemical plants to drinking water supply — the ball valve is the most widely used shut-off valve in industry. Why? Because no other valve principle achieves such reliable tightness with such low pressure drop. This guide explains all types, materials and how to select exactly the right valve for your plant.
How a ball valve really works
The basic principle is refreshingly simple — and that is precisely where its strength lies. Inside sits a drilled ball that can rotate 90°. When the bore is parallel to the pipeline, the medium flows through unhindered. Rotate the ball a quarter turn and the solid material seals the passage hermetically.
Sounds almost too simple? It is — and that is the point. No valve disc that must be pressed against flow pressure. No threaded stem that jams at high differential pressure. The ball rotates; done. The result is a bubble-tight shut-off with minimal effort, even at high pressures.
With floating ball design, the ball is pressed against the downstream seats by the medium pressure itself — a self-reinforcing effect, ideal for low to medium pressures. For larger nominal diameters, the trunnion-mounted ball is used, where the ball rests on trunnions and spring-loaded seats are pressed against the ball.
Bubble-tight Seal
Class VI per ANSI FCI 70-2 — the highest leakage class for shut-off valves. Zero drips, zero leakage with correct sizing.
90° Operation
Full open and close in a quarter turn — manually in under one second, via actuator in fractions of a second.
Minimal Pressure Drop
Full-bore ball valves provide near-unrestricted flow when open — no flow obstruction, no unnecessary energy loss.
Low Maintenance
Few moving parts mean little wear. Maintenance intervals of several years are standard in clean media.
In safety-critical processes, uncontrolled media release can cause consequential damage within fractions of a second. A ball valve closes manually in under one second — a gate valve of the same nominal diameter may take minutes. This difference is often decisive in emergency shutdown scenarios.
The main ball valve types
Not all ball valves are equal. The range extends from the simple threaded valve for drinking water to the fully automated flanged valve for the process industry. Here are the types that really matter in industrial use.
Flanged Ball Valve
The workhorse of the process industry. Flanged connection per DIN EN or ASME enables pressure-rated, standards-compliant integration into large pipelines. Often three-piece and maintenance-friendly — the centre section can be removed without loosening the flange connections. Matching flange gaskets available directly from Fergo.
DN50–DN250 · up to PN100Threaded Ball Valve
The classic for smaller nominal diameters — DN8 to DN100. With internal thread per ISO 228 or ISO 7-1 it installs quickly. From drinking water supply to chemical laboratories, this type covers a surprisingly broad range of applications.
DN8–DN100 · up to PN633-Way Ball Valve
With a single valve, two flow paths can be switched — as L-bore for diverting or T-bore for distributing or mixing. This saves several separate shut-off elements and noticeably simplifies plant layout.
L-Bore · T-BoreWeld-on Ball Valve
Wherever absolute leak-tightness is required and no detachable connections are desired — petrochemicals, cryogenic media, high-pressure plants. The connection is permanent, low-maintenance and tolerates extreme temperature cycling.
Permanent · No FlangesPneumatic Ball Valve
For fast switching cycles and remote control. A pneumatic part-turn actuator — double-acting or single-acting with spring return — opens and closes in fractions of a second. ISO 5211 interface for easy actuator replacement. Solenoid valves and Switchmaster as accessories.
Automated · ATEX OptionElectric Ball Valve
When no compressed air is available or precise positioning is required. Electric part-turn actuators support 24V to 240V AC/DC — ideal for building automation and PLC-controlled systems such as KNX or Modbus.
24V–240V AC/DC · PLCBall Valve DVGW / Drinking Water
For gas and drinking water lines, DVGW-approved valves are mandatory — not just a recommendation. Fergo supplies ball valves with DVGW approval per DIN EN 13774 for gas and DVGW drinking water quality mark. All certificates at fergo-valve.com/certificate.
DVGW Gas · DVGW Drinking WaterDuplex / Special Material Ball Valve
Seawater, chlorides, highly corrosive process media — standard stainless steel quickly reaches its limits here. Duplex steel (SS32205 / 1.4470) offers twice the yield strength with superior corrosion resistance. Offshore and marine applications.
Duplex · Seawater · OffshoreFull-bore ball valves have a bore diameter equal to the nominal diameter — virtually no pressure drop, piggable. Reduced-bore versions are bored one size smaller: more compact, less expensive, but not suitable for pig operations. In pipelines requiring pigging, full bore is standard — otherwise reduced bore is often the more economical choice.
Where ball valves are indispensable
Ball valves are present in virtually every industry — from food production to energy generation. What makes this valve class so versatile? The combination of fast switching capability, high tightness and minimal pressure drop when open.
Chemical & Petrochemical
Aggressive acids, alkalis, solvents and explosive media demand stainless steel or duplex ball valves with TA-Luft and ATEX approval. Three-piece design facilitates maintenance without operational interruption. For extreme media: PFA-lined valves.
Gas & Energy Supply
In natural gas and liquefied gas applications, DVGW-approved ball valves with fire-safe design and SIL certification are standard. Fast closure — potentially life-saving in emergencies.
Water & Wastewater
From drinking water treatment (DVGW, WRAS) to wastewater plant control. Pneumatically actuated flanged ball valves enable fully automated operation in waterworks. Strainers are recommended to protect the valve.
Food & Pharmaceutical
Hygienically perfect surfaces, EHEDG-compliant materials and residue-free cleanability — stainless steel ball valves in V4A quality (1.4408) meet these requirements without compromise.
Heating, Ventilation & Cooling (HVAC)
Rapid shut-off of cooling and heating circuits. Electric ball valves with 24V actuator integrate seamlessly into building automation and control systems.
Offshore & Marine
Seawater and chlorides severely attack standard steel. Duplex ball valves with elevated PREN value provide the required service life without short replacement intervals.
Choosing the right material
The material of a ball valve is not a minor detail — it determines corrosion resistance, permissible temperatures, pressure limits and ultimately the service life of the valve. The wrong material costs not only money but in the worst case jeopardises plant safety.
Always select based on the most aggressive medium in the operating cycle — not the normal case. A stainless steel ball valve that carries water 95% of the time but is occasionally flushed with hydrochloric acid must be designed for the hydrochloric acid — otherwise it will be unusable within months. Further guidance in the technical instructions.
Advantages & limitations — facts, not marketing
Ball valves are the superior choice in most situations — but not for everything. Here is the unvarnished truth:
- Bubble-tight seal — Class VI per ANSI FCI 70-2, no dripping or leaking
- Minimal pressure drop — Full bore offers near-unrestricted flow when open
- Fast actuation — 90° rotation fully opens/closes in under one second
- Low maintenance — Few moving parts, long service intervals
- Versatility — Suitable for liquids, gases, steam and aggressive media
- Automation-friendly — Simple ISO 5211 connection for part-turn actuators
- Piggable — Full-bore versions allow pipeline cleaning by pig
- No throttling — Ball valves are shut-off valves, not control valves. Partial opening damages the seat
- Water hammer risk — Fast closure can generate pressure surges, dampening measures required
- Abrasive media — Solids damage ball and seats (except ceramic versions). Alternative: knife gate valves
- High-viscosity media — Viscous fluids increase actuation forces and overload standard levers
- Space requirement — Bulkier and heavier than butterfly valves at large nominal diameters
- Cost at large DN — Significantly more expensive than comparable butterfly valves or knife gate valves above DN200
Ball valve vs. other valves
The question "which valve for my application?" is one of the most frequent in plant planning. No type wins in every category — but the differences are clearer than one might think. Fergo supplies all mentioned valve types: ball valves, butterfly valves and knife gate valves.
| Criterion | Ball Valve | Butterfly Valve | Knife Gate Valve | Gate Valve |
|---|---|---|---|---|
| Leakage class (typ.) | Class VI / Bubble-tight | Class IV–V | Class III–IV | Class III–V |
| Pressure drop (open) | Very low (Full Bore) | Medium (disc in flow) | Very low | Very low |
| Actuation type | 90° rotation | 90° rotation | Translational | Translational |
| Max. rated pressure (typ.) | up to PN100 / Class 600 | up to PN25 | up to PN10/16 | up to PN100 |
| Abrasive media | Conditional (ceramic option) | Poor | Good | Conditional |
| Automation | ✓ Easy (ISO 5211) | ✓ Easy | ✓ Possible | More complex |
| Suitability as control valve | ✗ Not recommended | Conditionally possible | ✗ No | ✗ No |
| Cost from DN150 | High | Low | Medium | Medium |
Step by step to the right ball valve
The selection always follows the same pattern — once you have internalised it. Here is how experienced plant engineers proceed:
Define the medium and operating conditions
What flows through the pipeline? Chemical composition, pH value, temperature and pressure — these are the fundamental input data. Aggressive media require V4A or higher; high temperatures restrict sealing materials. Without this data, any selection is guesswork. Further guidance in the technical instructions.
Determine nominal diameter and bore type
Should the ball valve be piggable or is pressure drop critical? Then full bore. Does reduced passage and lower cost suffice? Then reduced bore. Full-bore ball valves have slightly larger dimensions at the same DN but offer near-unrestricted flow.
Select connection type and standard
Thread for small nominal diameters up to DN100, flange per DIN EN 1092 or ASME B16.5, butt-weld ends for permanent connections. DIN EN standards dominate in Europe; for ASME projects, class ratings apply (150/300/600). Order matching flange gaskets at the same time.
Determine material based on corrosion resistance
Brass for water and gas in the supply sector. V4A (1.4408) as industrial standard for aggressive process media. Duplex for chlorides and seawater. PFA lining for extremely corrosive chemicals. Ceramic ball for abrasive slurries. Always select based on the most aggressive medium.
Specify actuation type and automation level
Handle lever up to max. DN150. Gear operator for larger diameters or frequent actuation under pressure. Pneumatic part-turn actuator for fast automated switching cycles. Electric actuator where no compressed air is available or PLC integration is required. Solenoid valves and Switchmaster as accessories. Check ISO 5211 compatibility.
Verify approvals and certificates
Drinking water: DVGW / WRAS. Gas: DVGW Gas per DIN EN 13774. Chemical plants: TA-Luft and AD2000-A4. Explosion protection: ATEX-certified actuators. Safety-critical processes: SIL 3. Offshore/marine: DNV or Bureau Veritas. These requirements come from the operator or legislature — no room for compromise. All Fergo certificates at fergo-valve.com/certificate.
For complex media or unclear requirements, a quick consultation is worthwhile. The Fergo team answers technical specification questions quickly and pragmatically — without sales pressure. Simply call: +49 (0) 21 31 / 15 39 28-0 or email [email protected]. Further information at Customer service.
Certificates that really matter
In industry, a valve without the right approval is sometimes as good as non-existent — at least legally and normatively. Fergo ball valves can be used in numerous regulated areas. All available certificates can be viewed at fergo-valve.com/certificate.
| Standard / Directive | Content & Relevance | When mandatory? |
|---|---|---|
| EN 1092-1 | Flange standard for industrial valves — bolt pattern, sealing faces, pressure ratings PN6 to PN400 | Standard in EU installations |
| DIN 2632 / 2633 | German flange standards PN10 and PN16 — still common in existing installations | Existing plants with DIN flanges |
| ASME B16.5 / ANSI Class 150/300 | American flange standard — relevant for international projects and chemical exports | Internationally operating companies, US markets |
| PED 2014/68/EU | EU Pressure Equipment Directive — CE marking obligation above certain pressure-volume products | From PN16 and DN25+ in hazardous fluids (Category I+) |
| DVGW W270 / VP 614 | Material hygiene drinking water (W270) and approval for gas applications (VP 614) | Drinking water and gas systems |
| ISO 5211 | Actuator interface for part-turn actuators — cross-manufacturer compatibility | With automated ball valves with part-turn actuator |
Fergo-Valve supplies all valves with complete declarations of conformity and CE marking per PED where required. On request, material test certificates 3.1 per EN 10204 and product-specific test certificates are available. Hydraulic pressure tests per PED 2014/68/EU are standard for flanged versions. All certificates at fergo-valve.com/certificate.
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