Manufacturer of DIN flanged industrial ball valves

KTN Valves manufactures DIN flanged ball valves to EN 1092-1 from DN15 to DN300, in PN16, PN25 and PN40. Bodies come in stainless steel 316, carbon steel or PFA lined. Executions include 2-piece full bore, 3-way L and T, the PFA lined KTN 123T jacketed series and trunnion, all with an ISO 5211 top flange.

Category overview

The DIN flanged ball valve is the default shut-off of European process piping. It arrives with two machined EN 1092-1 flanges and bolts onto the counterflanges without cutting pipe. KTN manufactures it from DN15 to DN300 in all three PN classes.

Above DN50 the flange replaces the thread, spreading the bolt load over several studs instead of one thread form.

Inside the KTN ball valve range, the DIN execution carries the process variants: three-way, trunnion and the PFA lined KTN 123T bodies.

How to choose a DIN flanged ball valve

Six decisions close the selection.

• Flange standard. DIN EN 1092-1 or ASME B16.5. What is installed decides: the holes do not line up.
• PN class. PN16 for water and compressed air; PN25 and PN40 for steam and pressurised process. Choose at working temperature.
• Flange face. Flat or raised. It must match the counterflange, and it sets gasket and bolt load.
• Body material. Stainless 316 for moderate chemical duty, carbon steel for water and steam, PFA lining when the fluid attacks metal.
• Execution. Two-piece full bore to shut off, 3-way L to divert, 3-way T to mix, trunnion when torque climbs.
• Seat and actuation. PTFE, reinforced PTFE or pentafite by temperature, plus an ISO 5211 actuator if automated.

For drawings in inches, use the DN to inches conversion table.

Applications and sectors

The PN flange is the default connection of European engineering, so this execution appears in almost every plant built to EN standards. KTN supplies it to chemical and petrochemical, water treatment, desalination, food, paper, power and HVAC.

Water and air run PN16 with a PTFE seat. Steam and thermal oil move to PN25 or PN40 with reinforced PTFE. Acids and brine take the PFA lined KTN 123T.

Types and executions we manufacture

KTN manufactures five executions on this connection, all sharing the EN 1092-1 flange and ISO 5211 top flange.

PFA lined ball valves: the KTN 123T jacketed series

In the KTN 123T series the metal body is lined internally with PFA, so the fluid only ever touches fluoropolymer and never sees the steel. The metal carries the pressure and the DIN flange; the polymer carries the chemical resistance.

The argument is economic. Hydrochloric acid, sodium hypochlorite and brine corrode 316 stainless, and the usual answer is an exotic alloy such as a nickel base. A lined body solves it with a steel shell and a fluoropolymer barrier.

The real limits are temperature and vacuum, not corrosion. The liner is chemically close to inert, so the fluid stops being the deciding factor. What matters is the maximum service temperature of the PFA and whether the line runs under vacuum: a sustained negative pressure can lift the liner off the body wall and collapse it into the bore.

Two names describe the same construction: buyers write PFA lined ball valve, engineers write jacketed ball valve or lined body. KTN builds it flanged, and as a jacketed wafer ball valve where face-to-face length is tight. State DN, PN, temperature and fluid to quote it.

3-way L port and T port

Choosing wrongly between L and T is the most common ordering mistake here. The L ball is drilled at a right angle: it connects the inlet to one outlet and closes the other, so it diverts. The T ball connects three ports at once, so it mixes or splits. A T fitted where the scheme called for an L leaves flow passing through the port that should be isolated.

What a DIN flanged ball valve is and how it works

It is a quarter-turn valve whose closure is a drilled ball rotating 90 degrees between two seats, fitted with two DIN EN 1092-1 flanges. Open, the bore lines up with the pipe; closed, the solid face meets the flow.

Sealing comes from two joints. The internal one is ball against seat: line pressure pushes the floating ball onto the downstream seat, so tightness improves as pressure rises. The external one is flange against flange, where gasket, face and bolt torque decide.

In the trunnion version the ball is fixed by shafts and the spring-loaded seats move against it. Torque drops sharply and stays constant, which is what large diameters need above DN150.

Materials, balls and seats

KTN manufactures the body in stainless steel 316, carbon steel or PFA lined. Stainless 316 is the default for moderate chemical duty, treated water and food processing; carbon steel brings the price down in water and steam.

The ball is solid and full bore as standard, so the nominal diameter stays intact and pressure drop stays close to that of the pipe.

The seat, not the body, sets the temperature ceiling. PTFE covers general service, reinforced PTFE takes more creep, and pentafite works where virgin PTFE flows under heat. Beyond that, selection moves to the metal seated ball valve, class VI to ANSI/FCI 70-2.

Connections, standards and actuation

The flange follows DIN EN 1092-1, in flat face or raised face (RF), with ISO 7005 design where the specification calls for it. A flat face needs a full-face gasket covering the bolt circle. A raised face concentrates the load on a narrow annulus, reaching the same gasket stress with less bolt torque. Bolting one against the other puts the joint in bending. See the flange faces guide.

DIN versus ANSI: why they are not interchangeable

A DIN flange and an ANSI flange do not interchange, even when the nominal diameter matches. The bolt pattern differs, the bolt circle differs, and the stud thread differs, metric on the European side and imperial on the American one. PN designates bars, ANSI designates classes.

A plant on EN piping with PN flanges takes the DIN valve. A line built to ASME B16.5 takes the ANSI flanged ball valve. KTN manufactures both, lined executions included.

The PN figure is the nominal pressure in bar at 20 °C, not the allowable pressure at any temperature. As the fluid heats up that figure falls, and the seat usually limits first. State pressure and temperature together.

Every valve carries an ISO 5211 top flange. The actuator is sized on breakaway torque with a margin, never on nominal torque, and that torque grows with DN and PN class. KTN valve automation supplies it mounted and tested.

Buying DIN flanged ball valves direct from the manufacturer

KTN Valves (Kara Technology News, S.L.) is a Spanish manufacturer based in Rubi, Barcelona, selling direct from the factory. With no intermediaries the price comes from the plant, special executions are made to drawing, and every order carries a certificate of origin, with 3.1 traceability on request.

To quote a DIN flanged ball valve KTN needs eight data:

• Size in DN or inches, DN15 to DN300.
• PN class: 16, 25 or 40.
• Flange face: flat or raised.
• Body: stainless 316, carbon steel or PFA lined.
• Ball and stem material.
• Seat: PTFE, reinforced PTFE or pentafite.
• Execution: 2-piece, 3-way L, 3-way T, PFA lined KTN 123T or trunnion.
• Actuator on ISO 5211, if fitted.

Add fluid and temperature and the offer comes back closed. KTN also builds equivalents to drawing from a previous manufacturer’s reference. Send the specification through the contact page to request a quotation, or call +34 937 818 219 between 8:00 and 19:00 CET.

Why choose KTN as your manufacturer

KTN Valves is a European manufacturer with its own plant at Ctra. Rubi-Sabadell km 13, nave 7, 08191 Rubi, Barcelona, running under ISO 9001 with Bureau Veritas inspection when a project requires it.

• Own lined series. The PFA lined KTN 123T is made in this plant, not bought in.
• Full range. DN15 to DN300 and PN16 to PN40, in stainless, carbon and lined bodies.
• Made to drawing. Port patterns, special materials and actuator assemblies.
• Documentation. Certificate of origin with every order, 3.1 material certificate on request.
• Technical support. PN class, flange face and torque confirmed before manufacture.

Related categories

This page covers the European flanged connection and the lined bodies built on it. The rest sits in industrial ball valves, inside the KTN industrial valves catalogue.

• ANSI flanged ball valves: ASME B16.5 drilling, class 150 or 300, for American specification.
• Threaded ball valves BSP, NPT and SW: up to DN50, where flanging adds cost and weight.
• Wafer type ball valves: clamped between counterflanges. Shorter and lighter, but not valid at a line end.
• Metal seated ball valves: when temperature, abrasion or class go beyond PTFE.
• Sanitary clamp end ball valves: hygienic process with CIP cleaning and a hand-opened clamp.

Frequently asked questions

What is a DIN flanged ball valve?

It is a quarter-turn valve with a drilled ball and two flanges machined to DIN EN 1092-1, bolted onto the counterflanges of the pipe. KTN manufactures the DIN ball valve from DN15 to DN300 in PN16, PN25 and PN40, with a body in stainless 316, carbon steel or PFA lined, and seats in PTFE, reinforced PTFE or pentafite.

What are PFA lined ball valves used for?

PFA lined ball valves handle acids and aggressive media. The metal body is lined internally with PFA, so the fluid only touches fluoropolymer and never the steel. That solves hydrochloric acid, hypochlorite or brine without paying for an exotic alloy. KTN builds them as the jacketed KTN 123T series, on the DIN flanged execution.

What are the limits of a jacketed ball valve?

Temperature and vacuum, not corrosion. The lining is chemically close to inert, so the fluid stops being the deciding factor. The maximum service temperature of the PFA sets the ceiling, and a sustained vacuum can lift the liner off the body wall and collapse it into the bore. State temperature and vacuum conditions before ordering.

Which PN class do I need: PN16, PN25 or PN40?

PN16 covers most water and compressed air service. PN25 and PN40 cover steam, thermal oil and demanding process. The PN figure is the pressure in bar at 20 degrees C, and the allowable pressure falls as temperature rises, usually limited by the seat first. Send pressure and temperature together and KTN confirms the class.

Are DIN flanged valves compatible with ANSI flanges?

They are not interchangeable. The bolt pattern, the bolt circle diameter and the stud thread all differ, metric on DIN and imperial on ANSI, and the pressure reference differs too: class 150 is roughly PN20 and class 300 roughly PN50. KTN manufactures both standards, so the enquiry only needs to state which one the line follows.

What is the difference between a 3-way L port and T port ball valve?

The L ball is drilled at a right angle: it connects the inlet to one outlet and closes the other, so it diverts. The T ball connects three ports at once in certain positions, so it mixes or splits. Fitting a T where the scheme called for an L leaves flow passing through the port that should be isolated.