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pneumatic double acting drives
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Electric Part-Turn Actuator
J4C Typen Standard, Stellungsregler, BSR Akkupack, Stellungsregler + Akkupack, Drehmoment 10Nm - 300Nm, Befestigung in Standard und auf Anfrage (9mm - 22mm), Spannung 24V - 230V - 240V
SR40 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F05
Product number
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410-1001-1
Flange size ISO 5211 F05, double-acting, 90° pivoting, spring force closing (Normally Closed), aluminium body, hard anodised, 14mm star, 14 springs, NBR seals, max. operating pressure 8 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€104.00
€123.76 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR20 Pneumatic single-acting Spring-loaded opening, 90° swing Actuator-ISO F03/F05
Product number
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411-1000-3
Flange size ISO 5211 F03/F05, single-acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 9mm, number d. springs 6, seals NBR, max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
9mm
Price
€94.44
€112.38 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2100 Pneumatic single-acting Spring-loaded opening, 90° swing Actuator-ISO F16
Product number
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411-1012-1
Flange size ISO 5211 F16, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 46mm, number of springs 14, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€1,499.74
€1,784.70 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR850 Pneumatic single acting Spring return opening, 90° swing Actuator-ISO F10/F12
Product number
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411-1007-1
Flange size ISO 5211 F10/F12, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 27mm, number of springs 14, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
27mm
Price
€588.83
€700.71 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR500 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F07/F10
Product number
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410-1006-2
Flange size ISO 5211 F07/F10, Double-acting, 90° pivoting, Normally Closed, Housing aluminium, hard anodised, Mounting (star) 22mm, Number of springs 14, Seals NBR, Max. operating pressure 8 bar Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
22mm
Price
€376.67
€448.24 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR20 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F05
Product number
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410-1000-2
Flange size ISO 5211 F05, single-acting, 90° pivoting, Normally Closed, aluminium body, hard anodised, 14mm star, 6 springs, NBR seals, max. operating pressure 8 bar, max. pressure in the range of 1.5 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€89.95
€90.37 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR1200 Pneumatic single acting Spring return opening, 90° swing Actuator-ISO F10/F14
Product number
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411-1008-1
Flange size ISO 5211 F10/F14, single-acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 36mm, number d. springs 14, seals NBR, max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
36mm
Price
€819.05
€974.67 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR200 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F07/F10
Product number
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410-1004-1
Flange size ISO 5211 F07/F10, double-acting, 90° pivoting, spring force closing (Normally Closed), aluminium housing, hard anodised, 17mm star, 14 springs, NBR seals, max. operating pressure 8 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
17mm
Price
€203.79
€242.51 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2500 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F14
Product number
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410-1010-2
Flange size ISO 5211 F14, Double-acting, 90° pivoting, Normally Closed, Housing aluminium, hard anodised, Mounting (star) 46mm, No. of springs 14, Seals NBR, Max. operating pressure 8 bar Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€2,353.31
€2,800.44 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR40 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F04
Product number
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410-1001-3
Flange size ISO 5211 F04, double-acting, 90° pivoting, Normally Closed, aluminium body, hard anodised, 14mm star, 14 springs, NBR seals, max. operating pressure 8 bar, max. pressure in the range of 1 to 10 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€104.00
€123.76 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR20 Pneumatic single-acting Spring-loaded opening, 90° swing Actuator-ISO F04
Product number
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411-1000-1
Flange size ISO 5211 F04, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 14mm, number of springs 6, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€94.44
€112.38 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR20 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F04
Product number
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410-1000-1
Flange size ISO 5211 F04, single-acting, 90° pivoting, Normally Closed, aluminium body, hard anodised, 14mm retainer (star), 6 springs, NBR seals, max. operating pressure 8 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€89.95
€107.04 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR1750 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F14
Product number
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410-1009-1
Flange size ISO 5211 F14, Double-acting, 90° pivoting, Normally Closed, Aluminium body, hard anodised, Star connection 36mm, No. of springs 14, Seals NBR, Max. operating pressure 8 bar Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
36mm
Price
€1,002.11
€1,192.51 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2500 Pneumatic single acting Spring return opening, 90° swing Actuator-ISO F14
Product number
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411-1010-2
Flange size ISO 5211 F14, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 46mm, number of springs 14, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€2,470.98
€2,940.46 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR4000 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F16/F25
Product number
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410-1011-1
Flange size ISO 5211 F16/F25, double-acting, 90° pivoting, spring force closing (Normally Closed), aluminium housing, hard anodised, mounting (star) 55mm, number of springs 14, seals NBR, max. operating pressure 8 bar, max. pressure in the range of 1.5 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
55mm
Price
€3,551.04
€4,225.74 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR1200 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F10/F12
Product number
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410-1008-2
Flange size ISO 5211 F10/F12, double-acting, 90° pivoting, spring force closing (Normally Closed), aluminium housing, hard anodised, mounting (star) 36mm, number of springs 14, seals NBR, max. operating pressure 8 bar, max. pressure in the range of 1.5 to 10 bar. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
36mm
Price
€780.04
€928.25 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR40 Pneumatic single-acting Spring-loaded opening, 90° swing Actuator-ISO F04
Product number
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411-1001-3
Flange size ISO 5211 F04, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 14mm, number of springs 14, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Seal :
NBR
Body:
Aluminum, hard anodized
Connection:
14mm
Price
€109.20
€129.95 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2100 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F14
Product number
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410-1012-2
Flange size ISO 5211 F14, Double-acting, 90° pivoting, Normally Closed, Housing aluminium, hard anodised, Mounting (star) 46mm, No. of springs 14, Seals NBR, Max. operating pressure 8 bar Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€1,428.32
€1,699.70 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2500 Pneumatic single-acting Spring-loaded closing, 90° pivoting Actuator-ISO F16
Product number
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410-1010-1
Flange size ISO 5211 F16, Double-acting, 90° pivoting, Normally Closed, Housing aluminium, hard anodised, Mounting (star) 46mm, Number of springs 14, Seals NBR, Max. operating pressure 8 bar Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
14
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€2,353.31
€2,800.44 incl. VAT
Delivery Time:
in stock
Available:
In Stock
SR2500 Pneumatic single acting Spring return opening, 90° swing Actuator-ISO F16
Product number
Copy to clipboard
411-1010-1
Flange size ISO 5211 F16, single acting, 90° pivoting, spring force opening (Normally Opened), housing aluminum, hard anodized, mounting (star) 46mm, number of springs 14, seals NBR, Max. Operating pressure 8 bar
Piston / Plunger:
Aluminium
Number d. Springs :
6
Design :
single-acting, 90° pivoting
Connection:
46mm
Seal :
NBR
Body:
Aluminum, hard anodized
Price
€2,470.98
€2,940.46 incl. VAT
Delivery Time:
in stock
Available:
In Stock
Frequently Asked Questions – Pneumatic Actuators
A pneumatic rotary actuator converts compressed air pressure into a 90° rotary motion to operate a quarter-turn valve – typically a butterfly valve, ball valve, or plug valve. Compressed air acts on pistons that drive a rack-and-pinion mechanism, converting linear force into the rotary output torque needed to open or close the valve.
Typical applications of pneumatic rotary actuators:
Typical applications of pneumatic rotary actuators:
- Process automation – Fully automated opening and closing of valves in chemical, pharmaceutical, food processing, and water treatment plants
- Emergency shut-off – Fast safety isolation thanks to short switching times (milliseconds to a few seconds)
- Remote operation – Valve actuation in inaccessible or hazardous locations without manual intervention
- ATEX / Ex-rated zones – The preferred actuator type in explosive atmospheres, as pneumatic actuators are inherently spark-free
- High switching frequency – Suitable for applications with many cycles per hour at low lifecycle cost
FERGO pneumatic rotary actuators are available in two fundamental operating principles:
FERGO DA – Double Acting:
FERGO DA – Double Acting:
- Compressed air acts in both directions – opening and closing are each powered by air pressure
- Maximum torque available in both directions of rotation – ideal for high-torque valves and large pipe sizes
- On air supply failure, the valve remains in its last position (no defined fail-safe position)
- More compact construction for a given torque output compared to spring-return actuators
- Preferred where no specific fail-safe end position is required on loss of power or air
- Compressed air acts in one direction only; internal springs automatically return the valve to its pre-set fail-safe position on air failure
- Fail-safe closed (NC – Normally Closed): valve closes on air loss → fail-safe position CLOSED – standard for safety-critical isolation duties
- Fail-safe open (NO – Normally Open): valve opens on air loss → fail-safe position OPEN – e.g. cooling water lines that must remain open in an emergency
- Essential wherever process or plant safety requires a defined valve position on energy failure
- Slightly larger footprint than a double-acting actuator of equivalent rated torque
All FERGO pneumatic rotary actuators feature a standardised ISO 5211 interface. This international standard defines the bolt circle patterns, flange dimensions, and shaft profiles for direct mounting of rotary actuators onto quarter-turn valves – regardless of manufacturer.
What this means in practice:
What this means in practice:
- Direct mounting without brackets – FERGO actuators mount directly onto all FERGO quarter-turn valves: butterfly valves, ball valves, and plug valves
- Standardised output shaft – Square and double-square drive profiles from 9 mm to 22 mm per ISO 5211, covered across the standard actuator size range
- Standardised bolt pattern – F03 to F16 depending on actuator size; allows straightforward actuator interchange between different manufacturers
- Adapter kits on request – For special valves or non-standard shaft sizes, FERGO supplies matching adapter kits
Correct actuator sizing is critical for reliable operation and long service life. The following parameters must be considered:
- Required valve torque – Dependent on valve size (DN), pressure rating (PN), line pressure, and seat material. FERGO data sheets provide the torque values for each valve type; the actuator output torque should exceed the valve breakaway torque by a safety factor of at least 1.25 (double acting) or 1.5 (spring return)
- Available air supply pressure – FERGO actuators are designed for a standard supply of 5–6 bar. Lower-pressure variants are available on request
- Operating principle – Double acting (DA) delivers active torque in both directions; spring return (SR) delivers active torque in one direction only – the spring set provides the return torque
- Ambient temperature – Standard actuators are rated for −20 °C to +80 °C. With optional silicone piston rings, operation down to −40 °C is possible – essential for outdoor installations in cold climates or cryogenic processes
- Switching frequency – High cycle rates require verification of the compressed air supply capacity and optimisation of line cross-sections
The NAMUR solenoid valve (also called a pilot valve or control valve) is the interface between the electrical control system (PLC, DCS, fieldbus) and the pneumatic actuator. It converts a 24 V DC solenoid signal into an air flow that drives the rotary actuator open or closed.
FERGO supplies NAMUR solenoid valves in two configurations, matched to the actuator operating principle:
FERGO supplies NAMUR solenoid valves in two configurations, matched to the actuator operating principle:
- 3/2-way NAMUR solenoid valve – Three ports, two positions. For single-acting (SR) actuators: the valve either supplies air to the actuator or exhausts it – the spring set handles the return stroke. The fail-safe position is always adopted when the solenoid de-energises
- 5/2-way NAMUR solenoid valve – Five ports, two positions. For double-acting (DA) actuators: the two actuator chambers are alternately pressurised and exhausted to deliver active torque in both directions
A limit switch box (position feedback unit) mounts directly on top of the rotary actuator and reports the actual valve position – typically OPEN and CLOSED switching signals – back to the control system (PLC, DCS, SCADA).
Why is position feedback essential?
Why is position feedback essential?
- Confirms that the valve has actually reached the commanded position – not merely that the control signal was issued
- Enables process monitoring and alarm generation if a valve sticks or fails to close fully
- Required for Safety Instrumented Systems (SIS) and protective interlocks
- Foundation for remote monitoring, operational data logging, and predictive maintenance
- Mechanical microswitches (M2) – Proven, cost-effective contact solution with adjustable OPEN and CLOSED switching points
- Inductive sensors (N2 / D2) – Contactless, wear-free position detection using IFM inductive proximity switches for high cycle rates
- IP67 protection rating – Dust-tight and waterproof; suitable for outdoor installations and harsh industrial environments
- ATEX-certified version – Approved for use in explosive atmospheres (Ex zones)
- Multi-voltage version – Compatible with multiple control voltages without hardware modification
Yes – pneumatic rotary actuators are the preferred actuator type for ATEX zones and explosive atmospheres. The fundamental safety advantage: the actuator itself contains no electrical components and therefore generates no ignition sources – it is inherently spark-free.
Key points for ATEX installations:
Key points for ATEX installations:
- Actuator body – The pneumatic rotary actuator itself does not require ATEX certification, as it contains no electrical parts
- ATEX solenoid valve – The NAMUR solenoid valve used to pilot the actuator must be certified for the relevant ATEX zone (Zone 1, Zone 2, Zone 21, Zone 22) – FERGO supplies ATEX-rated solenoid valves on request
- ATEX limit switch box – The position feedback unit is also available in ATEX-certified versions for Ex-zone installations
- Complete ATEX assembly – FERGO configures and supplies complete Ex-rated automation units: valve + pneumatic actuator + ATEX solenoid valve + ATEX limit switch box, assembled and tested
Beyond standard actuators for general industrial use, FERGO offers the following options and accessories:
Special versions:
Special versions:
- Low-temperature down to −40 °C – Optional silicone piston rings enable operation in extreme cold; essential for outdoor installations in arctic climates, cold stores, and cryogenic processes
- Low-pressure versions – Actuators designed for supply pressures below the standard 5–6 bar range, available on request
- ATEX versions – Complete Ex-rated automation assemblies for Zone 1/2 and Zone 21/22 (see previous question)
- NAMUR solenoid valves – 3/2-way and 5/2-way, 24 V DC, for single-acting and double-acting actuators
- Limit switch boxes (Switchmaster) – IP67, ATEX, mechanical (M2) or inductive (N2 / D2)
- Inductive sensors – IFM proximity switches for wear-free position detection
- Silencers – Exhaust noise reduction at the solenoid valve outlet port
- Flow control plates – Adjustable orifice plates to regulate actuator switching speed
- Compressed air filters – Pre-filtration to protect actuator internals from moisture and particulate contamination
- J4C Electric Part-Turn Actuator – The alternative where no compressed air supply is available; ISO 5211, multi-voltage, 10–300 Nm