ARGO-HYTOS : Hydraulic valves for hazardous areas

Hydraulic systems must function safely and reliably in potentially explosive areas. For more than ten years, ARGO-HYTOS has been offering safe EX valves for mines, chemical or petrochemical plants, as well as dusty areas prone to explosion.

The valves are designed according to the explosion protection class EPL b. This corresponds to a "high" level of protection for use in particularly hazardous areas where there is a possibility of ignition during normal operation or foreseeable malfunctions.

Explosion-proof spool operated valves are available in the market in different versions. Each of them consists of an electrical part, an electromagnet control coil, and a mechanical part that includes a control system and a hydraulic part.

The basic protection of the electromagnet coil is encapsulation with insulating material (protection class m, EN 60079-18). The terminal box for electrical connection of the coil as well as the cable gland are certified according to e (EN 60079-7). Our EX valves are certified for explosion-prone areas with hazardous dust according to protection class t (EN 60079-31).

The coils themselves are certified according to the European directive 2014/34/EU and internationally valid IECEx as well as other national standards.

The rated power is related to the maximum surface temperature of the coil, which is in turn divided into classes: valves with a 10 W coil can be used in temperature classes T4 (135 °C), T5 (100 °C) or T6 (85 °C), provided that power supply, ambient temperature and fluid temperature specifications will not be exceeded. The 18 watt variant can only be used in class T4 due to higher power dispersion.

Valves can be equipped with manual emergency control in case of coil or power failure. Manual control can be controlled up to a pressure of 25 bar in the control system. The coil-operated directional control valve with built-in manual control enables operation at pressures of up to 100 bar on the T-port. This does not affect normal coil control.


  • Explosion-proof operation
  • Certified according to international standards
  • Flexible power supply
  • Corrosion resistant
  • Not susceptible to mechanical stress
  • Can be used in harsh conditions in mines

Argo-Hytos customer applications.

Argo-Hytos customer applications, whether for mobile machines or stationary devices, must comply with high requirements for compactness, modularity, easy controllability of components, as well as energy efficiency of hydraulic systems.

ARGO-HYTOS : Pressure relief valve SR4E2-C2

We present to you the new SR4E2-C2 pressure release valve with excellent stability in the entire flow range up to 180l/min.

The picture will help to better identify the functionality of this valve:

Technical parameters

  • Connection thread 1 1/16-12 UN (VC-12-2)
  • Maximum flow rate up to 180lmin (48 GPM)
  • Maximum pressure up to 350 bar (5100 PSI)
  • High level of anti-corrosion protection 520h SST (according to ISO 9227)
  • Working temperature of the liquid -30...+80°C

Benefits and advantages

  • Excellent stability in the entire flow range up to 180 l/min
  • Low hysteresis and precise pressure control
  • Easily replaceable electromagnet coil and easy positioning of the connector
  • Possible combined function of pressure release and relief valve
  • Remotely controlled switching between the set minimum and maximum pressure values using a control electromagnet
  • Elimination of pressure peaks in case of a significant change in flow rate
  • Extremely low pressure drop for high flow rates
  • Its function has an effect on the longer service life of the hydraulic drive
  • Lower final costs for assembly and operation

Example of use

Pump relief
The valve is used to relieve the pump - connection with the tank at a low pressure loss. This solution reduces the heating of the working fluid and the cost of the input energy of the system.
First, the max. must be set. pressure p1 and then min. pressure p2. Setting the maximum pressure is possible with an activated electromagnet using a screw with a socket for a size 10 key. Setting the minimum pressure is possible with a deactivated electromagnet using a screw with an internal 6HR 3.

For more information regarding the new SR4E2-C2 pressure relief valve, visit our site at this link.

Find out more

ARGO HYTOS change of coil production


Coils of all sizes (C14B, C19B, C22B, C31A) with E1 and E2 connectors (EN 175301-803-A) with a DC supply voltage of up to 60 V will be supplied with only two supply contacts as standard, and the grounding contact will no longer be standard in these coils. Deliveries of coils with a grounding contact will continue to be possible, but they will be for an additional fee determined by the price list (see the price list chapter). Coils without a ground contact will also automatically be used in all affected solenoid operated valves. The hydraulic characteristics of the valves will not be affected by this change.
Coils with a DC supply voltage above 60 V will continue to be supplied with three contacts (two supply contacts and one ground contact) and will be for an additional fee (see the price list chapter). Coils with AC supply voltage (connectors E5 and E51) or coils for explosive environments will not be affected by this change.


Removal of the grounding contact refers to:

  • coils of all sizes (C14B, C19B, C22B, C31A) with E1 and E2 connectors (EN 175301-803-A) with DC supply voltage up to 60 V
  • all electromagnetically controlled ON/OFF + proportional, CETOP + CARTRIDGE valves in which these coils are used (note: for built-in SD and ROE valves, the spool is ordered separately as standard)
  • blocks and aggregates in which these coils and valves are used 

This change does not apply to:

  • coil with alternating supply voltage (connectors E5 and E51)
  • coils for valves with CSA certification
  • coils into an explosive environment

ARGO-HYTOS : Radial blade position sensor for RPEX3-06*S6

We make your products better. Worldwide.
The company ARGO-HYTOS informs about the latest modernization of the valve for environments with the potential for explosion RPEX3-06*S6.
A completely new S6 radial blade position sensor that has many new features and benefits compared to the old one, such as more classes and groups for hazardous areas, including expanded certifications.

Technical parameters

  • ATEX electromagnet coil certification according to Directive 2014/34/EU and IECEx according to OD 009 IECEx for potentially explosive environments
  • Non-contact induction sensor for indication of reaching the end position of the blade
  • Reduction of the dependence of the hydraulic performance of the valve on the viscosity of the liquid by using a five-chamber body
  • Design limiting the temperature of the electromagnet prevents ignition
  • High transmitted hydraulic power, maximum pressure up to 350 bar while maintaining low pressure loss by using a high flow body
  • A large selection of shutter connections and emergency manual controls

ATEX / IECEx Certification

Usage details 
Variants of certified control electromagnets and position sensors for valves intended for environments with different risk of explosion:

Logic valve SL2H-BP3

We are pleased to announce the expansion of our product portfolio to include products from the line of logic valves.
Technical parameters

  • The valve maintains a constant pressure drop across the valve for flow control (e.g. proportional distributor) and thus a constant volume flow independent of changes in the load of the appliance
  • Connection thread 7/8-14 UNF (C-10-3S)
  • Maximum flow rate up to 80 l/min (21 GPM)
  • Maximum pressure up to 350 bar (5100 PSI)
  • High level of anti-corrosion protection 520h SST (according to ISO 9227)


  • High volumetric flow rate
  • Fast and smooth response to load changes
  • Stable function in the entire flow range
  • Precisely manufactured and hardened key parts
  • Setting the pressure drop with the adjusting screw
  • Function of a two-way pressure balance or the main stage of an indirectly controlled reducing valve
  • Working temperature of the liquid -30...+120° C

Example of use

Stabilization of pressure drop
The logic valve stabilizes the pressure drop on the flow control valve and thus ensures the independence of the volume flow from changes in the load on the appliance or from fluctuations in pump pressure. The position of the scale scale is controlled by the difference in pressures sensed before the valve (1) and after the valve (3). The pressure drop is given by the pressure of the spring on the face of the blade and is stabilized by throttling the flow (2 → 1) with the blade.
In the basic position, the logic valve is open. The flow, and thus also the speed of movement of the output member of the appliance, can be continuously controlled by changing the flow cross-section of the flow control valve or by changing the pressure drop on the logic valve using the adjusting screw.
The logic valve is connected between the pump and the flow control valve (input connection) if the load force is positive, i.e. in the direction against the movement of the output member of the appliance.

Indirectly controlled proportional switchgear

We are pleased to present our new indirectly controlled proportional spool valve PRM8 in size NG10 (CETOP05) with high transmitted hydraulic power.

Technical parameters

  • Pressure range up to 350 bar (5080 psi)
  • Flow rate up to 210 l/min (55.5 gpm)
  • Standard version of coils size NG06 (CETOP03)
  • Wide range of connection connector types
  • Optional types of manual switchboard control
  • High level of surface protection by galvanizing up to 520 h. SST (according to ISO 9227)


  • Simple implementation thanks to small installation dimensions
  • Excellent transmitted hydraulic performance of 210 l/min @ 350 bar
  • Unique construction solution of the valve with high efficiency
  • Unique high flow ratio while maintaining small dimensions

ARGO HYTOS valve blocks

Valve blocks consist of a large number of integrated valves such as relief valves, directional control valves and pressure control valves. They are placed in one case. This compactness facilitates assembly, reduces leakage points and enables optimized hydraulic flow.

What are the main technical characteristics of valve blocks?

  • they reduce the susceptibility to leaks and increase the reliability and tightness of the system.
  • they facilitate assembly, save space and increase the overall efficiency of the system.
  • They thus increase the efficiency and performance of machines and systems by enabling precise control and regulation of hydraulics.
  • they reduce maintenance and operating costs.

Valve block materials

  1. The steel offers excellent strength properties and is suitable for high pressures up to 420 bar.
  2. Cast iron provides a good balance of strength and cost effectiveness for similar pressure ranges up to 420 bar.
  3. Aluminum is lighter and suitable for applications with pressure up to 250 bar.

Different types and designs of valve blocks

  1. Monoblock: they are made of one piece and provide a compact and robust solution. They are ideal for applications with limited space and are particularly suitable for smaller systems.
  2. Connecting plates or control plates: Their design allows easy mounting of valves and connections directly on the plate.
  3. Longitudinal or vertical connection: In these designs, valves and connections are connected either longitudinally or vertically. Linked settings enable optimized valve arrangement and efficient use of available space.

What are the applications for valve blocks?

  1. Stationary, industrial machines and devices
  2. Mobile machines
  3. Agricultural, forestry, construction machinery and equipment.


New Sequential valve of cartridge design, directly controlled, with external drainage port


Product benefits:

  • The valve ensures the sequence of movements of the hydraulic actuators
  • Limits the maximum pressure in the circuit and thus protects the circuit against pressure overload
  • Integrated bypass one-way valve prevents cavitation
  • External drainage of the spring space through channel 3
  • The pressure in channel 2 does not affect the opening pressure of the valve
  • The valve can be adjusted even while the device is in operation - sealed adjustment element
  • Long service life with a guarantee of > 10 million cycles for an operating pressure of 420 bar
  • Low energy consumption

Technical parameters

  • standard versions of the chamber 7/8-14 UNF (C-10-3S)
  • Volume flow up to 40 l/min (11 GPM)
  • Pressure up to 420 bar (6100 PSI)
  • Wide range of adjustment of the opening pressure of the sequential valve up to 420 bar (6100 PSI)


Built-in valves for industrial use


  • Design for gate valves or poppet
  • Two-position and three-position
  • 2, 3, 4-way distributors
  • Single-stage (direct control) and two-stage (indirect control with control stage)
  • Manually operated hydraulic, pneumatic, electric
  • Built-in (cartridge) or mounting plate (CETOP)
  • Selected distributors in versions for explosive atmospheres (ATEX)

One-way valves:

  • Unidirectional logical three-way valves
  • Selection valves
  • One-way valves
  • One-way valve with bypass
  • Hydraulic locks - controlled opening
  • Hydraulic locks - controlled closure

And pressure reducing valves:

  • Directly managed Bypass valves
  • Nepriamoriadené bypass valves
  • Reducing valves directly managed
  • Nepriamoriadené reducing valves
  • Safety valves with bypass
  • Sequence valves

Butterfly valves:

  • Built-in butterfly valves
  • Butterfly valves in modular design
  • Two-way flow control valves with pressure gradient stabilization
  • Three-way butterfly valves with the stabilization of the pressure gradient
  • Dividers and connectors Flow

Brake valves:

  • Triggering brake valves
  • Triggering brake valves, partly independent of the dynamic pressure
  • Triggering brake valves, completely independent of the dynamic pressure
  • Triggering brake valves, quite balanced, with internal drainage

Proportional technology:

  • Proportional distributors for installation on board brightness NG4, NG6 and NG10
  • Directly controlled bypass solenoid actuated proportional valves
  • Indirectly administered by the overflow solenoid actuated proportional valves
  • Directly controlled proportional solenoid reducing valves
  • Indirectly controlled by reducing solenoid actuated proportional valves
  • Two-way pressure regulator
  • Three-way pressure regulator
  • Electronics for control proportional valves

Connecting rods and blocks:

  • Terminal Connecting plates
  • Convection built-in valves
  • Cover plates
  • Connection board
  • Adapter plate for built-in valves

NEW TYPES of enclosures for directly controlled 4/3 switchgear

We are pleased to announce the expansion of the available enclosures for our new directly controlled 4/3 switchgear.
A new H11 and C11 shell is available.

Product benefits:

  • High hydraulic performance in a compact design
  • Energy saving up to 20%
  • Ports 2, 3, 4 can be loaded with a pressure of 350 bar (5080 PSI),
  • port 1 up to a pressure of 250 bar (3,630 PSI)
  • Low pressure losses
  • 4 types of shells
  • C19B* coil interchangeable within the SD*-A*/H* product line
  • Emergency control with locking in both extreme positions without the need for tools
  • Lifetime guaranteed up to 10 million cycles
  • Higher hydraulic performance and lower pressure loss than competitive solutions

Technical parameters:

  • Flow rate up to 30 l/min (7.9 GPM), working pressure up to 350 bar (5080 PSI)
  • Standardized chamber 3/4-16 UNF (C-8-4)
  • HNBR seal (liquid operating temperature range -30 … +80°C)
  • FPM seal optional (liquid operating temperature range -20 … +80°C)
  • High level of surface protection by galvanizing according to ISO 9227 (durability 520 h)


ARGO-HYTOS: NEW saddle, indirectly controlled, 2/2 distributor

We present to you a new saddle-type, indirectly controlled, 2/2 built-in distributor, intended for environments with a risk of explosion, characterized by excellent tightness in both directions.


  • Two-way tight valve
  • Ex, IECEx, ATEX certification according to directive 2014/34/EUa
  • Extremely high hydraulic performance
  • All channels can be pressurized
  • Flow rate up to 150 l/min, working pressure up to 350 bar
  • Normally closed (2S5) and normally open (2S6) variant
  • A wide selection of emergency controls, mainly for the S6 connection
  • Lifetime guaranteed up to 10 million cycles

Technical parameters

  • Flow rate up to 150 l/min, working pressure up to 350 bar
  • Standardized chamber 1-1/16-12 UN
  • EX, IECEX, CE, EAC certification
  • NBR seals (liquid operating temperature range -30 ... +80°C)
  • High level of surface protection by galvanizing according to ISO 9227 (durability 520 h)


Indirectly controlled 2/2 saddle built-in distributor with high volume flow and excellent tightness in both directions
SD3E-C2*S5 ( S6 )

Available basic shell positions 2S5 (closed) or 2S6 (open).


  • High tightness of the cone in both directions
  • Extremely high hydraulic performance
  • Flow rate up to 150 l/min, working pressure up to 350 bar
  • Normally closed (2S5) and normally open (2S6) variant
  • Coil interchangeable within the SD*-C/H* product line
  • A wide selection of emergency controls mainly for connecting the S6
  • Lifetime guaranteed up to 10 million cycles

Technical parameters:

  • Flow rate up to 150 l/min, working pressure up to 350 bar
  • standardized chamber 1-1/16-12 UN
  • NBR seal (liquid operating temperature range -30 … +80°C)
  • FKM seal (liquid operating temperature range -20 … +80°C)
  • High level of surface protection by galvanizing according to ISO 9227 (resistance 520 h)

Voith Technology Group takes over ARGO-HYTOS.

ARGO-HYTOS – a company based in Baar, Switzerland, develops and manufactures hydraulic components and system solutions with a focus on the mobile hydraulics sector (agricultural tractors, road and construction machinery, etc.).
The underlying agreement was signed on June 6, 2022. The deal is expected to be completed in August 2022, subject to all regulatory approvals. Both parties agreed not to disclose financial details of the transaction.

Voith is a technological leader in drive technology in various industries. The mobile hydraulics sector has been defined as another growth area for Voith Turbo. With its more than 70 years of experience, its focus on technology and innovation, as well as its clear customer orientation, the family business ARGO-HYTOS is a perfect fit for Voith. This makes ARGO-HYTOS the ideal entry point for Voith into this promising market.

Voith will acquire 79.5% of ARGO-HYTOS shares through the acquisition. The continued participation of the two previous owners – Christian Kienzle and FSP CAPCELLENCE – gives a strong signal that ARGO-HYTOS will consistently and continuously continue on the successfully embarked path even with the new ownership structure.

4/2 electromagnetically controlled switchboard with axial encoder and functional safety certificate

Argo - Hytos presents you with an improved RPE3-062x / xS3 switchgear with axial encoder, new with TÜV SÜD certification!

RPE3-062x / xS3 *


  • High hydraulic power
  • Low pressure losses
  • Contactless inductive valve position sensor with double inverted output signal
  • Wide selection of valve connections, supply voltage and coil connectors
  • High level of surface protection by galvanizing according to ISO 9227 (resistance 520 h)
  • Guaranteed service life of up to 10 million cycles

Technical parameters

  • Maximum flow up to 80 l / min (21 GPM)
  • Maximum working pressure up to 350 bar (5,080 PSI)
  • NBR seals (for temperatures from -30… + 80 ° C)
  • FPM seals (for temperatures from -20… + 80 ° C)
  • Low sensor switching point hysteresis

Peter Lauko

Tel.: +421 37 7777 955
Mobile: +421 903 282 644
Fax: +421 37 7777 967

Jaroslav Tvrdoň

Tel.: +421 37 7777 954
Mobile: +421 914 336 525
Fax: +421 37 7777 967

Vladimír Begáň

Tel.: +421 37 7777 954
Mobile: +421 914 336 527
Fax: +421 37 7777 967