Positioners – Applications, advantages and types

Positioners – Applications, advantages and types

A positioner converts the electrical or pneumatic input signal into a corresponding output signal that determines the setpoint position. The position feedback is characteristic for a positioner: It is used to determine the actual position and readjusts a possible difference if necessary.

Our positioners work according to the nozzle/flapper system principle: An air nozzle blows compressed air onto a flapper. The flapper then moves or changes the distance – depending on the position of the valve -and thus changes the back pressure in the system until the setpoint of the value is reached and equilibrium prevails.

Here you can find out more about how it works


Where are positioners used?

Positioners are found wherever the flow of liquids or gases in pipelines has to be controlled – usually in conjunction with control valves, but also other industrial valves such as ball valves, segment valves, butterfly valves and gate valves with pneumatic actuators. Positioners are also needed to control steam in pipelines, which is used to heat processes or transport energy in power plants.

Industrie - Wo werden Positioner eingesetzt?

What advantage do positioners bring?

When processes are automated and optimized, precisely defined flow rates are often required e.g. an industrial valve with a pneumatic actuator can be used for this purpose. However, such an actuator has the limitation that it can only open or close fully.

An additional positioner, on the other hand, allows you to control the actuator to any intermediate position – so you can precisely adjust your cylinder. This allows you to optimize the efficiency of the system and save valuable resources at the same time.

Positioner types

For single and double acting actuators

All SMC positioners can be used for double-acting actuators and, by closing one signal output, also for single-acting actuators. Double-acting actuators are equipped with two compressed air connections (one for each direction), single-acting only with one (a return spring always moves the actuator to the initial position without compressed air).

CYPO Positioner-Typen für einfach- und doppeltwirkende Antriebe

For linear or rotary actuators

The mounting of positioners on rotary actuators (ball valves, butterfly valves) differs from that on linear actuators (control valves, cylinder positioners), so that different mounting bridges and connecting parts are always required.

For some SMC series, such as the IP8*, you will find dedicated positioners for linear drives (IP800*) and for rotary drives (IP810*). For the ND9000 and ND7000 series, you can select the required accessories as an option.

Pneumatic, electric or smart

Pneumatic positioners use a signal pressure of 0.02-0.1 MPa to adjust the position of the actuator, making them suitable even for extreme environmental conditions such as temperatures of 100°C.

We also supply you with external electro-pneumatic pressure regulators e.g. the series ITV. Those can be used to convert an electrical signal into signal pressure.

CYPO+ITV Pneumatisch, elektrisch oder smart



lectric positioners are adjusted with an electrical signal – usually a DC signal with 4-20 mA.

Smart Positioners also have a built-in microcontroller (usually with a display). This automates calibration and allows you to set alarm limits and use digital transmission protocols (such as HART).


Everything from a single source at SMC

At SMC you will find all the necessary components for the automation of your valves: positioners, special valves up to the complete compressed air supply as well as corresponding accessories such as one-touch fittings made of stainless steel.

We also have many special versions in our product range, e.g. positioner with external position sensor without mechanical connection to the actuator, with flameproof enclosure, suitable for low temperatures down to -40°C – please contact us if you are interested.

Mounting bridges and mounting kits are also available on request and will be developed and produced by us according to your requirements.


Contact us for more information – we are happy to develop individual solutions for you, precisely tailored to your applications, wishes and requirements!

Greenfield investments in industrial automation

Greenfield investments in industrial automation

The fourth industrial revolution has long since begun: “Industry 4.0” describes the digital networking of manufacturing processes – people, machines and processes are intelligently connected to each other via the Internet. The computer no longer functions as the central technology, but the Internet.

Anyone contemplating a major construction project is well advised to rely on competent, reliable partners right from the start.

What exactly does »Greenfield« mean?

Greenfield investment is the construction of a new production site »on a green field«. Examples of greenfield projects are new, fully digitized factories, power plants, production facilities and manufacturing plants.

So-called smart factories are based on digitally transformed and networked production, in which all machines and systems are equipped with sensors or chips and thanks to their “smart” functionality, processes can be continuously optimized.

Difference between Greenfield and Brownfield

Manufacturing plants and factories are usually built with a lifespan of at least 20 to 25 years. Only then can the costs be amortized and profits generated. That’s why greenfield investments tend to be the exception.

Many companies are therefore implementing digitization as part of a brownfield approach: In the first step, all analog components and processes of an existing production plant are digitized. The actual digital transformation then takes place, in which machines, people and materials are digitally networked using sensors or chips. That means manufacturing, delivery, maintenance, production, delivery and customer service are linked in real time via the Internet.

Automation in greenfield projects

If you plan and build a smart factory, automation is just as much a part as the construction of systems for gases, liquids, instrumentation and temperature control. When building a new production, the entire installation for all media must be created and also automated.

At SMC we can offer you a wide range of components for gas and chemical lines as well as solutions for cooling circuits.

Gas components

Every gas supply system has specific pressure, flow and material requirements. We can provide you with complete solutions for your gas applications – from regulators and valves to venturi vacuum generators to sensors.


With our ultra high purity products such as diaphragm pumps, chemical valves and pressure regulators, we can support you in automating your processes in the high-end industrial sector while increasing productivity and efficiency at the same time. It also gives you precise control over acids, bases and other liquid chemicals.


Numerous industrial processes in which heat is generated, such as lasers, analytics, welding, semiconductors, the printing industry, etc., require the use of temperature control units. This allows the temperature to be monitored and controlled, and the quality of the end product can also be improved if the cooling unit is selected and sized correctly.

Are you planning a greenfield investment and looking for a competent partner who will help you set up and automate the necessary systems for all media?

Contact us – we look forward to your greenfield project and would be happy to advise you!

Cooling systems in 3D printing

Cooling systems in 3D printing

The field of additive manufacturing, as 3D printing is usually called in an industrial context, has grown exponentially in recent years. Three-dimensional objects are created by applying material layer by layer.

At the same time, the requirements regarding the protection of the devices from heat are increasing. Heat build-up should be avoided as far as possible, as theycan have an extremely negative effect:

  • Parts of machines can be destroyed
  • the service life is reduced
  • costs are rising

3D Printing: How It Works and Benefits

3D-Druck: Funktionsweise und Vorteile

In 3D printing, a component is built up layered by fusing or curing amedium. The fusion of metal powder is usually achieved with laser beams, the curing of resins with an exposure unit. The more constant the operating temperature of the laser or exposure unit, the more precise the resultof the printedmodel.

3D printing is a high-precision technology that delivers high-quality printing results – the cooling of the devices must therefore be correspondingly precise, temperature-stable and reliable.

Thereare four main advantages to this:

  • the effort in post-processing is lower
  • Longer service life of the laser or light source
  • lower costs
  • shorter delivery time

With FDM(Fused  Deposition Modeling, which is printing with plastic filament Dra Ht),water cooling may also berequired  if, for example, motors to drive the axles, the nozzles or the installation space itself have to be cooled.

Overall, the technologies of 3D printing bring great advantages in terms of efficiency,quality, costs and delivery times.

Where is 3D printing used?

Depending on the printing technology, different industries are served. Areas of application include: industry, model making, research, construction and medicine.

Classic materials for 3D printing are plastics, synthetic resins, ceramics and specially prepared metals.

The most established additive manufacturing processes include: stereolithography, laser sintering, laser beam melting, electron beam melting andmuch more.

The printing of ceramics is mainly used in the aerospace industry for the production of turbine motors as well as in medical technology, for example for the production of dental implants.

In the field of finishing  (which includes all processesthat come after production in 3D printing) in metallic 3D printing, the aim is to cool the heat generated in the chemical post-treatment process in the acid baths.

Cooling systems from SMC

At SMC, we have been producing cooling machines since1978, and our cooling systems have evolved over the years with the requirements and needs of our customers. SMC devices stand out for their high reliability (24/7 operation without failures) and temperature stability.

You will find various cooling solutions with us, including

  • Standard cooler
  • Rack Mount Coolers
  • Dual Channel Coolers
  • High-level coolers
Kühlsysteme von SMC

We accompany our customers from the starting signal to the completion of a project: From the first calculation to on-site tests, includingselecting the right cooler, to installation and commissioning.

When working together, you benefit from our global support, as we are represented in more than 80 countries. In addition, you can reduce the number of suppliers because we are at your disposal as a complete supplier (cooling, pneumatics, fittings, hoses).

Would you like to learn more about our possibilities in the field of cooling and temperature control in 3D printing?

Contact us – our team will be happy to answer your questions.



CVD and PVD coating processes

CVD (Chemical Vapor Deposition) and PVD (Physical Vapor Deposition) are coating processes that are often used for the surface treatment of tools and molds.

CVD – how it works

Chemical Vapor Deposition (CVD) is a coating process that produces thicker layers and is subject to comparatively high pressure and temperature. The most important application of CVD is wafer coating.

In CVD, a substrate is heated, on the surface of which a solid component is deposited from the gas phase as a result of a chemical reaction. In order to be able to deposit the solid layer at a specific reaction temperature, volatile compounds of the layer components must be present.

In contrast to physical processes, chemical vapor deposition can also be used to coat surfaces with complex three-dimensional shapes, such as the finest indentations in wafers.

Applications of chemical vapor deposition (CVD)

  • Electronics industry (chip manufacture)
  • Refining of glass (e.g. heat protection layers on architectural glass or protection against mechanical shock loads in bottling plants)
  • optical coatings on glass and plastic
  • gas-tight barrier layers
  • synthetic diamond layers on tools

 PVD – how it works

PVD is based on physical vapor deposition. These are vacuum-based coating processes or thin-film technologies. In contrast to the CVD process, the layer is formed here directly by condensing a material vapor from the starting material.

Physical vapor deposition involves very low pressure (high vacuum) and comparatively low temperatures, typically resulting in very thin coatings.

PVD processes are characterized by:

  • Gas (vapor) generation of the layer-forming particles
  • the vapor is transported to the substrate
  • and condenses on this, resulting in layer formation

Applications of physical vapor deposition (PVD)

  • Industry, especially in the field of machining
  • Microelectronics
  • Chip Manufacturing
  • Tools
  • Jewellery
  • Glass coating (architectural glass, displays …)
  • Food industry
  • Entertainment electronics (hard drives, CDs, DVDs)

High vacuum required

Physical vapor deposition only works in high vacuum because an extremely clean environment is essential for the manufacture of microchips, CDs and DVDs. Even the smallest particles are a big problem.

That is why venting a high-vacuum chamber is always a major challenge. It is important to aerate them slowly and in a controlled manner, because venting too quickly creates turbulence that stirs up particles in the chamber.

At SMC you get all the components you need for CVD processes and for ventilation and evacuation of your high-vacuum chamber for PVD processes: a wide variety of valves, temperature control units, sensors, etc.

Would you like to learn more about the various components?

Contact us – our team will be happy to answer your questions and advise you on your individual requirements.

Dust Collector Valves: pulse valves for dust filter systems

Optimized components and individual solutions for dust collector systems

Dust filters are used in many different industries – they remove dust and dirt from the exhaust air. In order to clean the filters, they are blown off shock-like by a strong compressed air pulse. For this you need pulse valves.

What is dust actually?

Dust is defined as the smallest, partially invisible, solid particles that can float in the air. Dust can simply be annoying and unpleasant (dirt, wear), but also life-threatening (carcinogenic, explosive). Especially fine dust poses high health risks.

Anthropogenic dusts endanger health

In most cases, anthropogenic dusts are fine dusts that can be hazardous to health because they can contain substances such as lead or mercury. In addition, hydrocarbons or sulfur compounds can settle on their surfaces.

For this reason, especially in the industrial sector, attempts are made to remove dust from the air directly at the source.

There are many sources of dust in industry: in the production of cement, tablets, fertilizers, wood pellets and asphalt, in sawmills, bakeries, foundries and grain mills, in furniture production, waste incineration, textile processing, powder coating and blasting technology, in recycling, welding, soldering and flame cutting, in grinding processes, in fossil power generation, in ore mining and many more.

Anthropogenic dusts endanger health  In most cases, anthropogenic dusts are fine dusts that can be hazardous to health because they can contain substances such as lead or mercury. In addition, hydrocarbons or sulfur compounds can settle on their surfaces.  For this reason, especially in the industrial sector, attempts are made to remove dust from the air directly at the source.  There are many sources of dust in industry: in the production of cement, tablets, fertilizers, wood pellets and asphalt, in sawmills, bakeries, foundries and grain mills, in furniture production, waste incineration, textile processing, powder coating and blasting technology, in recycling, welding, soldering and flame cutting, in grinding processes, in fossil power generation, in ore mining and many more.


Jet pulse cleaning with the JSXFA pulse valve

Whether in central dust collectors or local dust extraction systems – at some point every filter element is saturated. Hardly any of the air loaded with dust can be sucked in anymore and reach the external environment again as cleaned air.

The filters are cleaned by short, shock-like blow-offs in the opposite direction. A short burst of compressed air pushes the filter cake off the filter material. By inflating the filter bag, any additional encrusted dirt can flake off.

A central element in the cleaning of the filters is the pulse valve. Its task is to provide the largest possible amount of air in the shortest possible time to blow off the filter cake by a shock pulse. The decisive factor is therefore the pressure pulse as the result of air pressure (impact force) and compressed air volume.

Advantages of the JSXFA Series Pulse Valve

In addition to impulse valves of the JSXFA series, SMC also provides electrical (VXF2 series) and pneumatic (VXFA2 series) pulse valves.

Image: pulse valves series JSXFA
Image: pulse valves series JSXFA


The valves of the new JSXFA series have numerous advantages:

  • Higher flow rate of up to 50 percent compared to conventional pulse valves thanks to improved geometry.
  • Together with its faster response, it generates about 15 percent higher pressure pulse.
  • At the same time, the large “pressure release hole” promotes faster closing and reduces the total air consumption of the blowing pulse by around 35 percent.
  • Extremely long service life of at least 10 million cycles due to springless design and special high-strength elastomer diaphragm. With one cleaning per minute, a failure would therefore be expected after approx. 19 years – but since the cleaning intervals are two to ten minutes, the service life is even longer.
  • Extremely service-friendly: easier installation and faster maintenance thanks to springless diaphragm (even when installed).
  • Can be used for a wide temperature range (-40 to +60°C).
  • A reduction of response time by about 45 percent when switching off.

Complete solutions from SMC

To be able to emit the required strong compressed air pulse, the valves are connected to a small compressed-air tank. We are happy to offer such tanks on request with the help of our integrators.

Pilot valves and a control system in a cabinet are often used to control the pulse valves. The VXFC controller, which is equipped with a double pulse function, is suitable for electrical control. It optimizes the dust filter performance of the bag filter and can interrupt operation using input signals via an external switch.

As a special solution, we can offer a complete cabinet with all electrical and pneumatic components.

Header Tank
Image: header tank
control cabinet
Image: control cabinet

Do you want to reduce the CO2 footprint of your products and learn more about our material-optimized and energy-saving JSXFA pulse valves? Or are you interested in our VXF2 and VXFA2 series pulse valves? 

Get in touch with us – our team will be happy to answer your questions.

HRSH inverter ensures power savings and reduced CO2 emissions

HRSH inverter ensures power savings and reduced CO2 emissions

The temperature control unit of the HRSH series for cooling water is particularly energy-saving thanks to its triple inverter. The HRSH chiller adjusts the motor speed depending on the load, so that the chiller requires up to 53 percent less energy than non-inverter devices.

The temperature stability of the chiller is +/- 0.1 ° C, whereby the circulating fluid can be heated even during the winter months without electrical heating: the hot gas discharged from the compressor is used for heating.

What does an inverter do?

An inverter is a frequency converter that is used to operate electric motors and electric drives. It converts the uniform alternating voltage supplied by the local power grid into an alternating voltage, where amplitude and frequency can be changed. The control of frequency and voltage enables a stepless regulation of the rotation speed. In addition, frequency converters buffer the motor’s peak start-up currents and thus ensure that the supply network remains fault-free.

Electricity savings through needs-based setting of the frequency

With its three inverters, the chiller regulates the motor speeds of the compressor, the pump and the fan in accordance with the load of the user system: If the HRSH chiller does not need full power or if the process is currently paused, the chiller can adjust the speed of the electric motors.

This means that electricity savings of up to 53 percent can be achieved. Reduced CO2 emissions go hand in hand with saving electricity.

Pressure of the circulating fluid adjustable thanks to the inverter pump

While a non-inverter pump is constantly operated with the nominal power, the motor speed of the inverter pump is regulated to match the required pressure.

The outlet pressure of the circulating medium can be set via the control panel display. The inverter pump automatically regulates the outlet pressure to the target pressure without having to set a bypass to the required conditions. This control can reduce power consumption. It is also possible to set a pump speed.

Inverter control ensures energy-saving operation

In the refrigeration circuit the combination of

  • the inverter control of the compressor
  • and the fan
  • and the precise control of the two expansion valves

ensures for energy-saving operation without any waste, but with very high temperature stability.

The setting of the outlet pressure in the circuit of the circulating fluid by the inverter-controlled pump avoids wasteful pumping of the circulating medium and thus also saves energy.

Would you like to find out more about our energy-saving HRSH chillers with triple inverters?

Get in touch with us – our team will be happy to answer your questions.

Air Servo Cylinder IN-777 with integrated positioner unit

Air Servo Cylinder IN-777 with integrated positioner unit

Usually, the standard pneumatic cylinders can only move to two positions: they are either fully retracted or fully extended.
Thanks to a built-in positioner, our SMC Air Servo Cylinder IN-777 can be precisely adjusted to any position.


The Air Servo Cylinder IN-777 can be used for dart valves of flotation cells and for all other applications with linear movement e.g., as drive / actuator for industrial valves like butterfly valves, knife gate valves, diverter valves, jalousie valves, dampers, Dapó valves, etc.

Air Servo Zylinder IN-777 Plattenschieber

Dart valves are connected to air servo cylinders with rods and adjust the water level in tank or flotation cells.

Flotation is used to separate mixtures of materials in many industries like

  • mining industry in mineral processing for separating minerals from gangue by taking advantage of differences in their hydrophobicity
  • in industrial wastewater treatment, where it removes fats, oil, grease and suspended solids from wastewater.
  • in paper recycling to recover recycled paper

Air-Servo-Zylinder Application


Advantages and properties of pneumatic Air Servo Cylinder IN-777

The all-in-one solution of our IN-777 pneumatic positioning system has numerous advantages:

  • fast response time and high position accuracy of ± 0,5 mm
  • easy calibration of end positions
  • capable of air cylinder multipoint positioning and control
  • simple maintenance due to unitization:
    • for all cylinders the replacement parts are unified
    • valve unit, pilot valve, controller assembly, seal kit, etc., are easily replaceable
  • after replacement you can keep your settings
  • easy initial settings – after input of an I/O signal to move the rod forward set the rod stop position to 20 mA (or 4 mA)
  • 10 different speed settings available
  • Built-in self-diagnostic function via LEDs (power supply status, controller status, cylinder position sensor error, valve error, rod friction error) and signal output
  • Emergency stop of the piston when the air or power supply is cut
  • Fail-safe ports (if the pressurized air supply or power supply is cut, air from the emergency tank can be supplied via the FA/FB port in order to allow for the manual operation of the air cylinder rod)
  • Easy maintenance and fast replacement of positioner unit.
    You want to know how fast it can be done? Watch the video on our YouTube channel.

Working principle

The internal position sensor of the air cylinder transmits the current position of the piston rod to the controller. The controller sends a command signal to the servo valves according to the target position signal sent from the host controller. According to the command signal sent from the controller, the servo valves control the compressed air to move the piston rod forwards or backwards, or to stop it at the target position.

The opening and closing of the shutoff valve are controlled by the pilot valve connected to the controller.
Two air-operated shutoff valves (head side and rod side) are mounted along the air passage between the servo valves and the air cylinder. During an emergency stop (air or power supply cutoff, emergency stop signal input, etc.), the shutoff valves are closing, and the air cylinder operation stops.

Working principle

Operation modes

The Air Servo Cylinder IN-777 can operate in different modes:

  • target position (controlled by 4 – 20 mA)
  • manual mode – the rod moves according to the signal input by the master controller.
  • calibration modes – automatic (default) or manual
  • no signal operation – if signal is 4 mA or less the rod will move to a predetermined position and then stop.
Operation modes self-diagnosis

You want to know more about our air servo cylinder IN-777 and its applications?

Contact us – our team is happy to answer all your questions.

Improve the speed of your applications with Booster Valves

Pneumatic booster valves (also called booster relays, volume flow amplifier or volume booster) increase the speed of applications and are used in pneumatic systems to amplify the flow rates of compressed air.

A booster valve works similarly to an electrical relay and has three connections: supply pressure, output and signal. The signal pressure e.g. provided by a positioner to the signal port of the booster valve, leaves the output connection of the booster valve with a significantly higher flowrate (L / min), i.e. it has a much higher volume flow. If the positioner can deliver a maximum flow rate of e.g. 200 L / min compressed air, the booster valve can provide more than 1,400 L / min.

You will find a very good introduction how Booster Valves work in our YouTube video.

Frame Booster

When are Booster Valves used?

The usage of booster valves is necessary, if
  • the compressed air line between the positioner (control, pressure generation) and the pneumatic drive (actuator, consumer) is long – e.g. if the positioner is mounted far away from the cylinder
  • large actuators are to be driven quickly
  • components with large air consumption are used
  • and in the field of valve automation, especially with large industrial valves, in order to accelerate CYPOs (combination of CYlinder and POSitioner).
CYPOs (Kombination von CYlinder und POsitioner)

How a Booster Valve works in detail

The signal pressure enters the input chamber and a force creates pressure on diaphragm A in a downward direction on diaphragm B. When the force of the input chamber exceeds the force of diaphragm B, the inner valve opens and air flows out of the outlet. With signal pressure dropings the supply valve closes and the exhaust flow path opens so that the outlet pressure can be vented to the atmosphere. The inlet chamber and the outlet are connected via a needle valve. Signal pressure and outlet pressure are precisely matched to one another in a ratio of 1: 1. This is ensured by the factory presetting. The above function enables a low flow signal to produce a high flow output with a pressure ratio of 1:1 between the signal pressure and the output pressure. Booster-Schematic

Booster VentilesFeatures of Booster Valves

  • Volume flow boosters contribute significantly to increase the actuating speed.
  • Booster valves are robust, easy to use and very affordable.
  • The air consumption is 3 L / min or less.
  • Suitable for high (-5 to 100° Celsius) and low temperatures (-30 to 60° Celsius).
  • as copper free or stainless steel available.

 Schema Range of applications of booster relays

If you want to adjust
  • flowrates of fluids with large pneumatic control valves (like wastewater, freshwater, cooling water, liquid chemicals, oil, steam, ….),
  • large flowrates of gases with jalousie or butterfly valves (for exhaust gas / air, fresh air, smoke, etc.) or
  • the transport route of fine-grained solids (cement, gravel, ore, grain, chemicals, …) with CYPOs
then booster relays are an important and necessary part of your pneumatic circuit. VA-CAT2_marked

You want to know more about possible applications and the function of booster valves?

Contact us – our team is happy to answer all your questions and advise you on your individual requirements.
Tank bushing with chemically resistant, tight fitting

Tank bushing with chemically resistant, tight fitting

Conventional tank passages often only work with improvised solutions that are neither chemically resistant nor 100% leakproof. At SMC, we have developed a fitting that allows you to put a tube through a tank wall without having to cut the tube off.

In this video on our YouTube channel you can see how SMCs bore trough fitting works.

The special thing about the SMC bore trough fitting

Chemical resistance and tightness – these are the two outstanding properties of our bore trough fitting.

The PFA plastic that the fitting is made of is perfect for chemicals such as acids, alkalis and deionized water (demineralized water) and an operating temperature of max. 200° Celsius.

With our fitting you can remove liquids from a container (tank, pipe, etc.) without having to cut the tube on both sides. The fact that the tube remains intact ensures a particularly tight connection.

What else can be done with the bore through fitting

  • It can be used for metric (3 to 25 mm) and imperial (1/8 to 1 inch) tubing.
  • You can freely choose the line position: The tube or sensor can be inserted as far as you want into the tank or pipe – without cutting it off.

Applications and uses

Applications Tank bushing with chemically resistant, tight fitting

The SMC bore trough fitting is suitable for a wide range of applications due to its chemical resistance and tightness:

  • Pressurization of chemicals
  • Filling chemicals into a tank or draining them from a tank
  • Monitoring the temperature of media
  • Measuring parameters such as pH value or conductivity of a medium
  • Taking samples from large pipelines, e.g., for dirty water
  • Allow liquids to drain from an elevated tank
  • Tube-in-tube heat exchanger: using LQHB, it is possible to run a tube with a smaller diameter through a tube with a larger diameter, with the cooling medium located between the two tubes

Would you like to find out more about our chemical-resistant, leak-proof fitting for tank feedthroughs and its possible applications?

Contact us – our team will be happy to answer your questions.

Needle valves + chemical valves for the chemical industry

Needle valves and chemical valves from SMC ensure safety in the chemical industry

Chemical valves and needle valves are used in various industries that work with chemicals. These are, for example, large printing companies, electroplating or commercial disinfection.

The most important characteristic of the valves is that they are resistant even to aggressive chemicals such as acids, bases, or solvents. Only then the necessary security can be guaranteed.

Needle valves for adjusting the flow rate

A needle valve has a small opening and a needle-shaped, threaded valve piston. They can be used to precisely adjust the flow rate, which must be larger or smaller depending on the process and can be regulated between 0 and 12 liters per minute. Needle valves are designed to prevent bubbles from forming when slightly viscous liquids are used.

LVN – needle valves from SMC are made of a PFA material that is compatible with acids, alkalis and ultra-pure water and suitable for temperatures from 5 to 90° Celsius.

Chemical valves with LOTO function

Chemical valves are used to turn the flow mentioned above on and off.

The special LOTO function (lockout tagout) enables maintenance work to be carried out safely. With this safety feature, a valve is closed manually and fixed in this position. Accidental opening during maintenance work can thereby be avoided.

Areas of application in the chemical industry

Chemical valves and needle valves from SMC withstand aggressive chemicals such as acids and alkalis, as well as solvents used for industrial disinfection or dissolving printing ink, which can attack seals.

SMC valves for the chemical industry are especially suitable for use in the following industries:

  • Fertilizer
  • Plant protection
  • Varnishes, paints and printing inks
  • Professional cleaning and hygiene
  • Textile, leather and paper auxiliaries (special chemicals as auxiliaries or finishing materials enable the manufacture, processing, finishing or care of textiles, leather products or paper)
  • Adhesives


Depending on the area of application, different valves make sense. For example, if organic solvents are used, it is advised to use valves made of stainless steel. We offer a wide variety of variants and our chemists will be happy to help you make the right choice – just contact us.

We carry the following series of chemical valves:

  • LVD chemical valves are pneumatically operated, with integrated screw connections, and are suitable for media temperatures of up to 100° Celsius
  • LVA chemical valves also work pneumatically, with a threaded connection
  • LVH chemical valves are manually operated valves with integrated screw connections or with thread and available as latching or non-latching valves
  • LVQ chemical valves with integrated screw connections of various designs; both pneumatically and manually operated. There is also an option for media temperatures of up to 170° Celsius.

Features of SMC chemical valves

A new type of guide ring on the piston rod ensures a stable sealing surface by preventing lateral play of the valve seat. This extends the service life of the seals and reduces particle formation thanks to a stable working surface.

The special membrane design guarantees soft opening and closing, which prevents the formation of microbubbles.

The housing is designed for evenly flow with minimal internal dead spaces. Integrated fittings prevent residual liquid from accumulating in the pipe threads.

The body material (PFA) is suitable for ultra-pure DI water as well as for acids and bases, as it has an extremely high chemical resistance.

A damping disk absorbs the force of the piston and thus minimizes the formation of particles due to friction.

The membrane is supported by a shock absorber so that it deforms as little as possible, which ensures high back pressure resistance and durability.

You can also choose from a variety of tubing sizes.

Do you want to find out which of our needle valves and chemical valves are best suited for your application?
Contact us – our team will be happy to answer your questions.