Changeover valves

4.6.2025

Changeover valves

Cryogenic media

FEMA S4000 kolmitieventtiili varoventtiilien vaihto

Descote_-_palkeellinen_vaihtoistukkaventtiili

FEMA_-_S4100_varoventtiilien_vaihtoistukkaventtiili

HEROSE kryogeeninen vaihtoventtiili - cryogenic change over valve

Media

Cryogenic media

Process media

Manufacturers

ARI-Armaturen

HEROSE

AZ-Armaturen

descote

FEMA

Technical specifications

Size ranges: DN 15 – 600, ASME: NPS ½“ – 24“
Pressure classes: PN 10 – 400/ Class 150 – 2500
Other: plug or poppet type
Other designations: change over valves

What is a changeover valve?

A changeover valve is a device used to divert flow from one pipe to another. The most typical changeover valve application is in connection with two safety valves, where paired safety valves are connected to the inlet and outlet pipe by changeover valves that are interconnected. In this case, one safety valve can remain in operation while the other is taken out of service by turning a hand wheel.

Selection of changeover valve

We assist in the selection and sizing of a changeover valve according to the application requirements.

For process media

A changeover valve can be implemented in several ways. A plug-type changeover valve can be used, in which a shut-off element is located in the center of a Y-shaped body. It has seals on both sides. The valve seals one seal against the other when the other is fully open. Examples include changeover valves manufactured by ARIN, FEMAN and Descote. A flanged version of the Descote changeover valve is also available.

Another way to implement a changeover valve is to use a three-way plug valve. This way, the advantages of a plug valve can be utilized. For example, when dealing with challenging chemicals, one option is to use a lined three-way plug valve. In AZ’s range there is a changeover valve system that features two three-way plug valves connected to the same actuator.

For cryogenic media

Unlike a standard ball valve, a changeover valve has at least two safety valves. Their purpose is to protect the system (e.g. a liquefied gas tank) from overpressure. Thus, the changeover valve connects two safety valves to the pressure device. In a changeover valve, there are usually two outlets but only one inlet. Changeover valves are used when the medium is a cryogenic liquefied gas, such as nitrogen.

Changeover valves are available in sizes DN 15-50. They withstand pressures up to 250 bar at temperatures from -270 °C to +400 °C. Changeover valves are mainly manufactured in stainless steel, but also in bronze and brass.

Download brochures

Process media

AZ SAVA Special cross-over combinations for safety valves

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ARI-Armaturen Changeover valve 3-way Datasheet

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AZ UK Crossover valve combinations

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Sludge separators

4.6.2025

Sludge separators

Cryogenic media

HEROSE kryogeeninen suodatin - cryogenic filter

Media

Process media

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

LPG

Manufacturers

GESTRA

ARI-Armaturen

HEROSE

Technical specifications

Sizes: DN 15-500
Pressure ratings: PN 6-160
Materials: GG-25, GGG 40.3, GS-C 25, AISI 316
Connections: flange, welded, threaded
Other names: mud seal, strainer

What is a sludge separator?

A sludge separator – also called a strainer – is like a filter that ensures that the medium reaches the required degree of purity. Installing a sludge separator is also an easy way to avoid damage and slow the wear of more valuable equipment in the line. Various sludge separator are available with several different mesh sizes.

Sludge separator selection

We assist in selecting the sludge separator that meets the requirements of your application. Our product range covers a wide selection of various sludge separators.

Steel strainers from ARI-Armaturen are suitable for steam and condensate systems. For process systems, strainers can be selected from our acid-resistant models. Additionally, our range includes large basket strainers for high flow rates.

Cryogenic strainers are available from DN 10 to DN 200 and can withstand pressures up to 50 bar in operating temperatures ranging from -196°C to +120°C. Strainers are made of stainless steel and bronze.

Contact our representatives for more information.

Download Brochures

ARI-Armaturen Strainers PN6-40 datasheet

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ARI-Armaturen Strainers PN63-160 datasheet

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GESTRA SZ 36A Strainers Datasheet

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Flanged and welded non-return valves

4.6.2025

Flanged and welded non-return valves

Cryogenic media

HEROSE-takaiskuventtiili - non-return valve

Media

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

LPG

Process media

Gas and fuel

Manufacturers

Edward Flowserve

Tecofi

ARI-Armaturen

HEROSE

Technical Specifications

Sizes: DN 10-500
Pressure Classes: PN 16-500, ASME 150-2500#
Materials: GG-25, GS-C 25, AISI 316, GS-12CrMo19.5
Connection Types: Flanged, welded or between flanges
Other: valves can also be supplied clad
Cryogenic Valves: minimum temperature -196 °C, soft or metal seal, piston, tilting or wafer style check
Other Names: ball check valve, seat check valve, flanged and welded check valves

What are flanged and welded non-return valves?

The overall lengths of flanged non-return valves conform to standard dimensions, so replacement of broken valves can be done without pipe modifications. In new installations, it is often more economical to use non-return valves installed between flanges, as they are lighter in construction and more cost-effective.

In waterworks construction, flanged ball non-return valves remain a viable option if the medium contains material that clogs a conventional non-return valve.

Selection of flanged and welded non-return valves

We assist in selecting a non-return valve that meets the requirements of your application. Our sales representatives can provide you with detailed information on the opening characteristics of each valve, as well as support with sizing if needed.

Also, check out our Konwell Academy webinar on selecting and sizing non-return valves.

For steam, condensate, process media, gases, and liquid fuels

In many processes, it is essential to ensure that the non-return valve does not leak from the flange seal. For such applications, welded non-return valves suitable for a variety of materials with pressure classes up to PN 500 are appropriate.

Our product range also covers ASME non-return valves up to a pressure class of 2500#, including those that lock in the open position and sealing non-return valves.

For cryogenic media

Cryogenic non-return valves require specialized design solutions to meet exceptional cold resistance requirements. Our HEROSEN non-return valves are made from stainless steel and bronze.

Cryogenic non-return valves are available in sizes DN 10-200. They can withstand pressures up to 50 bar at operating temperatures of -196…+120°C. We can size the appropriate non-return valve based on your process data.

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Steam, Condensate, Process Media and Gases

Tecofi CBL4240 Flanged Ball Check Valves

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ARI-Armaturen CHECKO-V PN63-160 Check Valves

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ARI-Armaturen CHECKO-V and CHECKO-D Check Valves

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Liquid Fuels

ARI-Armaturen CHECKO-V and CHECKO-D Check Valves

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Tecofi CBL3240 Flanged Ball Check Valves

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Limit switches

3.6.2025

Limit switches

Cryogenic media

Media

Process media

Gas and fuel

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

LPG

Manufacturers

Emme Technology (Max-Air)

Netherlocks

Rotork

Sofis

Technical specifications

Other names: valve limit switch, valve position indicator, signal box

What is a valve limit switch?

Using limit switches, the system can easily and reliably obtain, for example, valve open/close status data, which can be further transmitted electronically to the control system.

In mechanical models, a switch is installed on the valve yoke that opens or closes with the movement of the valve. In this way, information on whether the valve is open or closed is obtained.

The inductive switch sends a trigger signal when metal or another electrically conductive material approaches the sensing surface.

The operation of the magnetic switch is based on changes in the magnetic field when the valve yoke rises or falls.

Limit Switch Selection

Our program includes mechanical, inductive, and magnetic limit switches. We assist in selecting the limit switch that meets the application’s requirements, including for ATEX zones.

Netherlocks, part of the Sofis group, manufactures compact VPI open/closed limit packages, which can be installed on virtually any existing valve. Both on rotary-operating valves and on manually operated screw valves. Our installation service measures the necessary dimensions from the existing valve for the intermediary parts. After delivery, we proceed to install and set up the limit package.

Contact our representatives for more information.

Download Brochures

Max-Air BE41-BS42 Limit Switch Box

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Max-Air BE45 SERIES Box Micro Limit Switch Box

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Max-Air BE48 BS48 BM48 Ex Limit Swiches datasheet

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Sofis VPI Position Indicator

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Netherlocks VPI Position Indicator

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Rotork Limit Switch Boxes

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Valve positioners

3.6.2025

Valve positioners

Cryogenic media

TU-A-I Siemens Sipart valve positioner - venttiilin asennoitin

Media

LPG

Process media

Gas and fuel

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

Manufacturers

Siemens

ARI-Armaturen

Technical specifications

Other names: valve positioner

What is a valve positioner?

The valve positioner usually converts a 4…20 mA current signal either into a proportional pneumatic output signal for a pneumatic actuator or drives a motor actuator in steps in the desired direction.

It is also possible to use a 0/2…10 V voltage signal or various digital fieldbus signals, such as Profibus, Fieldbus Foundation, or ASI, as a control signal.

Choosing a valve positioner

The SIPART PS2 digital valve positioner can be used in both linear and rotary pneumatic actuators, both single- and dual-acting. There is an option for the HART communication protocol, which allows for diagnosing the valve and tuning it using a programming device.

Digital and electro-pneumatic positioners from other manufacturers are also available according to customer needs.

We assist in selecting the appropriate positioner according to the requirements of the application. Ask our contacts for more information.

Download brochures

ARI-Armaturen STEVI-POS positioner

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Siemens Sipart PS2 Positioners datasheet

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Electric actuators

3.6.2025

Electric actuators

Cryogenic media

Toimilaitteelliset_kiilaluistiventtiilit

kiilaluistiventtiili sahkoisellä toimilaitteella

Media

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

LPG

Process media

Gas and fuel

Manufacturers

AUMA

BERNARD CONTROLS

ARI-Armaturen

Rotork

Technical Specifications

Other names: motor actuator, electric actuator

What is an Electric Actuator?

Shut-off and regulating valves can be equipped with an actuator, allowing the valve to be controlled from a location other than in its immediate vicinity. Whereas pneumatic actuators use compressed air to operate, electric actuators use electricity.

In large actuators, short-circuit motors (synchronous motor) have traditionally been used, in which the valve is directed in the desired direction by changing the polarity of the rotor windings with alternating current. Actuators are supplied only for a specific voltage and frequency.

Brushless DC motors (BLDC) have become common in smaller actuators, enabling the use of 24 VDC as well as providing flexibility with AC voltages. For example, as standard, the ARI-Premio-Plus actuator operates within a voltage range of 90–264 VAC, 47–63 Hz.

The advantage of electric actuators is their significantly greater force output relative to their size compared to pneumatic actuators. Therefore, they are well suited for large, high-force valves such as wedge gate valves.

Selection of an Electric Actuator

We assist in selecting an electric actuator that meets the requirements of your application.

Our product portfolio includes ARI PREMIO electric linear actuators, whose power capacity is designed in a sensible and cost-effective manner for ARI shut-off and control valves. We also offer other electric actuators available on the market, such as AUMA, Bernard, and Rotork.

In our recorded webinar, we presented ARI-Armaturen’s PREMIO-PLUS 2G actuator.

Contact our representatives for more information about electric actuators.

Download Brochures

ARI-Armaturen ARI-PREMIO

Lataa PDF

ARI-Armaturen ARI-PREMIO-Plus 2G

Lataa PDF

ARI-PREMIO FAIL SAFE Electric Actuator with safety reset Datasheet

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ARI-Armaturen FR1.2_Electric Thrust Actuator Datasheet

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ARI-Armaturen FR2.1-2.2 Electric Thrust Actuator Datasheet

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ARI-Armaturen ARI-OM

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Pneumatic actuators

3.6.2025

Pneumatic actuators

Cryogenic media

ARI-Armaturen DP pneumatic actuator - pneumaattinen toimilaite

HEROSE toimilaitteellinen sulkuventtiili

Media

Steam and condensate

Cryogenic media

Natural gas, biogas and biomethane

LPG

Process media

Gas and fuel

Manufacturers

SART von Rohr

ARI-Armaturen

Rotork

Technical Specifications

Others: suitable for both linear and rotary movements
Other names: diaphragm actuator, pneumatic actuator, rack and pinion actuator, scotch-yoke actuator

What is a pneumatic actuator?

A shut-off valve can be equipped with an actuator, allowing the valve to be controlled from a location other than its immediate vicinity. In pneumatic actuators, compressed air controls the actuator to open or close.

In dual-action actuators, compressed air both opens and closes the valve.

In single-action models, the operation can be designed so that compressed air either opens or closes the valve, and an internal spring within the actuator performs the opposite movement if the compressed air is lost.

The advantages of a pneumatic actuator include its quick response and resistance to vibration compared to electric actuators.

Selecting a Pneumatic Actuator

Pneumatic actuators are divided into rotary actuators (90º / 120º) – which are suitable for ball, butterfly, and plug valves – and linear actuators, which are suitable for sleeve and slide valves.

Our stock of rotary actuators includes GT (gear) and RC (scotch-yoke) single- and dual-action pneumatic actuators. Upon request, we also equip valves with actuators from other brands.

In ARI-Armaturen sleeve valves, we use the factory’s own linear DP actuators.

Pneumatic actuators can be equipped with various limit packages, positioners, and solenoid valves.

We assist in selecting the pneumatic actuator that meets the requirements of your application. Contact our representatives for more information.

Download Brochures

Rotork GT-Range Pneumatic Actuators Datasheet

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Rotork RC200 Range

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ARI-Armaturen DP30-35 Pneumatic Actuators

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Level switches

3.6.2025

Level switches

Cryogenic media

säiliön pintakytkimet - tank level switch

Media

Steam and condensate

Cryogenic media

LPG

Process media

Gas and fuel

Manufacturers

GESTRA

Aplisens

Intra-Automation

Technical specifications

Other designations: level switch

What is a level switch?

Level switches transmit information to the system when the liquid reaches a predetermined height. The system then controls the process based on this information.

Level switch selection

We assist in selecting a level switch that meets the requirements of the application. Contact our representatives for more information.

Our range includes float switches that can be installed from the top or from the sides. The float switch is a traditional and quite cost-effective method for performing an on-off level measurement. Vertical models are available with several limit switches.

A somewhat more modern method is electrode measurement. Its advantage is that it is maintenance‐free, as the electrode does not have any so-called moving parts. Electrodes are clearly suitable for higher temperatures than float switches, making them applicable, for example, in steam boilers.

If limit switches are sufficient for level control, the best solution is the GESTRA conductive electrode, which can provide up to four separate limit signals. A compact model is also available, in which four separate voltage-free changeover contacts are integrated into the electrode.

Conductive level switches based on conductivity measure the resistance when immersed in the liquid. They are used for conductive liquids. Applications include dry run protection, prevention of overfilling, and on-off level control.

Limit switches are also available for magnetically controlled level indicators, providing limit data in addition to a local display.

Download brochures

Aplisens Type ERH Level Switch datasheet

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Intra-Automation Magnetically Controlled Liquid Level Indicator Type ITA

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Intra-Automation ITA Magnetic Sensing Transmitter

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Intra-Automation ITA Magnetic Multi-Float-Switch

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GESTRA NRGS11-2 NRGS16-2 Level Monitoring Datasheet

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GESTRA NRGS11-1 NRGS16-1 NRGS16-1S Level Monotoring Datasheet

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WIKA Float Switch HSL-S HLS-P Datasheet

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WIKA Float Switch FLS-S FLS-M FLS-P FLS-H

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Level transmitters

3.6.2025

Level transmitters

Cryogenic media

APR-2000ALWS-T2 level transmitter - pintalähetin -

säiliön pintalähetin - tank level transmitter

Media

Steam and condensate

Cryogenic media

LPG

Process media

Gas and fuel

Manufacturers

Intra-Automation

Nuova Fima

GESTRA

Aplisens

Technical Specifications

Connections: available with various process connections
Other names: level transmitter

What is a Level Transmitter?

Level transmitters transmit information about the movement of the surface to the controller, which in turn directs control valves according to the given parameters.

Choosing a Level Transmitter

We help in selecting a level transmitter that meets the requirements of the application.

Capacitive Level Measurement

Capacitive level measurement is a common principle for measuring surface height in industry. The sensor and the tank form the two electrodes of a capacitor. The change in capacitance caused by the change in surface level is converted in the electronics into level information, and the sensor transmits a 4-20 mA signal to the system.

For continuous level measurement, GESTRA utilizes a capacitive electrode with an integrated active transmitter (output signal 4-20 mA) or a separate amplifier, whereby communication between the sensor and amplifier is in digital form. The GESTRA surface electrode is intended for liquids with a conductivity of at least 0.5 µS/cm. The sensors’ pressure/temperature class is max. 32 bar(g)/238°C, PN 40.

Pressure-Differential Based Level Transmitter

Pressure-differential transmitters and flange-mounted level transmitters are suitable for the same applications as electrode-type sensors, as well as for applications where, for example, non-conductive liquids, chemicals, etc. are measured, or where the required pressure/temperature resistance is too high for electrodes. Models available for connection to 4-20 mA Hart, Profibus PA, or FF-bus.

Magnetic Level Transmitter

The magnetic float transmitter is installed at the top of the tank or at the tank side. Various connection options are available. The magnet inside the float creates a magnetic field to which reed switches respond, enabling continuous level measurement.

Ask our contacts for more information about level transmitters.

Download Brochures

Nuova Fima ST LV

Lataa PDF

GESTRA DBL 810367 07 NRG26-40

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GESTRA DBL 810194 09 NRGT26-1-NRGT26-1S

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Intra-Automation Magnetic Level Sensing Transmitter Type ITA-T1S

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APLISENS SG-25 SG-16

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APLISENS APR-2000ALW

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APLISENS SGE-25 SGE-16 Hydrostatic Level Probes datasheet

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APLISENS APC-2000ALW

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Level indicators

3.6.2025

Level indicators

Cryogenic media

Magneettinen pintaosoitin - magnetic level indicator

kryogeeninen pinnanmittaus - cryogenic level indicator

säiliön pinnanmittaus - tank level measurement

Media

Natural gas, biogas and biomethane

LPG

Process media

Gas and fuel

Steam and condensate

Cryogenic media

Manufacturers

DIESSE

Intra-Automation

Rochester Sensors

Hadro Techniek

Technical specifications

Pressure classes: PN 6-320
Materials: AISI316, PVC, PP, PVDF
Suction materials: titanium, acid-resistant steel, plastic
Measurement range: 5000 mm/section max., longer ones are made from several parts
Media temperature: -50 °C…400 °C
Display: mechanical and/or electronic
Alarm limits: adjustable reed switches
Other: can be equipped with an analog transmitter using a reed switch chain
Other designations: level indicator

What is a Level Indicator?

A level indicator allows you to visually determine the level of the surface in a tank or inside a steam boiler. Although steam boilers are equipped with automated level monitoring with dry-heating protection, the law also requires a visual level display.

Selection of Level Indicator

We assist in selecting the level indicator that meets the requirements of the application. Below are four different models: glass tube indicator, reflective indicator, backlit indicator, and magnetic indicator.

In low-pressure tanks, it is most cost-effective to use a simple glass tube indicator.

If the pressures are higher, we recommend a robust reflective indicator.

In both of these models, the liquid level can be seen through the transparent measurement section in the indicator.

Glass tube, reflective, and backlit indicators are equipped with shut-off valves, with optional safety balls in case of glass breakage. Connections are flange or welded.

In a backlit level indicator, a light is added behind the indicator, making it easier to read the level.

In a magnetic level indicator, a float moves along with the level inside an acid-resistant/plastic tube. The magnet in the float rotates the slats on top of the level indicator. Insulated models and insulated with trace heating models are also available.

The advantage of the magnetic level indicator is its clear visual indication. The slats are either bright white or red, depending on the liquid level. With traditional level indicators, the glass tube becomes dirty over time and must be replaced as part of maintenance.

It is also easy to extract an electrical switch signal or mA signal to systems from the magnetic level indicator. ATEX-rated models are also available.

Download Brochures

Intra-Automation Magnetically Controlled Liquid Level Indicator Type ITA

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DIESSE Glass Level Gauge DS_LG-RBF_GR18

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Intra-Automation ITA Magnetic Indicator

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DIESSE Glass Level Gauge Reflex Type

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