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HAFNER Pneumatik: Your expert for pneumatic valves in the process industry


We are very proud to have one of the widest ranges of smart valve automation components for process automation. Besides 3/2-way and 5/2-way valves for standard on and off applications, customers often require special control valves and accessories. HAFNER offers a solution for any valve automation task. Just ask us!

 

Some technical features make HAFNER valves especially valuable in the process industry:

 

  • Special coil design for superior protection in wet environments up to IP 67
  • Exhaust air recirculation to protect the actuator from aggressive environmental air as a standard feature
  • Low power solenoid system, suitable for ASI-Bus systems
  • Valves with fail-safe function
  • Maximum air flow with compact design
  • Different NAMUR mounting port schemes
  • Valves with a ¼” (VDI / VDE 3845) as well as ½” NAMUR interface
  • Valves with SIL3 and Ex certification, for -50°C and entirely made of AISI316 stainless steel
  • Wide range of accessories such as NAMUR flow regulator plates, quick exhaust valves, block and vent valves and many more
 






Our bestsellers: 3/2-way and 5/2-way NAMUR valves in different sizes:



 701            

Series 701

• Orifice size 7 mm
• 1,250 Nl/min
• NAMUR Interface 1/4“
• Ports G 1/4“
 101   

Series 101

• Orifice size 10 mm
• 2,250 Nl/min
• NAMUR Interface 1/4“
• Ports G 3/8“
 121  

Series 121

• Orifice size 12 mm
• 3,000 Nl/min
• NAMUR Interface 1/2“
• Ports G 1/2“






 






namur flex                        

NAMUR-Flex

The NAMUR-flex is designed for a maximum of flexibility. The valve itself can be used as a 5/2-way type on double acting actuators.

By adding the flex-plate it is converted into a 3/2-way valve for single acting actuators.









schnellentlüfter                       

Quick-exhaust blocks

The quick-exhaust block with NAMUR interface allows big spring-return actuators to close at high speed.

It offers a maximum exhaust volume of 2,500 Nl/min.

An integrated non-return valve ensures that no ambient atmosphere can be sucked into the actuator while exhausting.









bhn 420 701                                  

Short-cut valve

In the case of automated process valves which are equipped with a manual gear box, it has to be ensured that no air is trapped inside the actuator in case of manual operation.


The HAFNER short-cut valve connects both actuator chambers with each other so that the air can flow from one chamber into the other. The user doesn’t have to close the process valve against any air pressure.







  

drn                             

NAMUR flow regulator plates

Block form flow regulator as intermediate plate to be assembled between actuator and pilot-valve.

 

Advantages:

 

  • Regulation for 5-way or 3-way valves
  • For double acting or spring-return actuators
  • Two kinds of manipulation, manual or with a screw-driver
  • Very precise regulation
  • Only possibility to regulate the forward and backward stroke of a spring-return actuator that is controlled by a 3-way valve separately and precisely
  • Stainless steel versions available
drn 2    
drn 3  

Also available with the 1/2“ NAMUR interface!







Air-recirculation block                               Air-recirculation block


The Hafner NAMUR air-recirculation block guarantees that only exhausting air from the actuation side - and certainly no potentially aggressive ambient atmosphere
- goes into the spring chamber.

 

Especially used for protecting the springs inside the actuator when remotely piloted (e.g. with a valve which is assembled in a control cabinet).

 

Valve is designed for spring-return pneumatic actuators with a 1/4” Namur interface. G1/4” pilot port.








block valve                                Block valve

The BHN 611 01 is designed to lock the air inside an actuator. It is typically used for process valves on tanks where maintenance personnel have to go into the tank to clean it.

 

Another usage is for repair work in pipelines.

 

The valve is lockable in manual mode (M position) and protected with a pin against unintended use in standard operation mode (O position).










block and vent valve                                  Block and vent valves


The BHN 601 and BHN 601 01 are designed to manually exhaust an actuator. These valves are typically used to avoid injury
to maintenance personnel when working on installed process equipment.

 

BHN 601 01 exhausts actuator when knob is pushed. Lockable in manual mode (M position) and protected with a pin against unintended
use in the standard operation mode (O position).

 

BHN 601 exhausts actuator when knob is pulled. Lockable in standard operation mode (O position).








mneh 411 701                                  Electrically actuated block valve


The MNEH 411 701 is made for blocking the air supply from the pilot valve to the actuator and holding it in the current position.
It offers a so-called stay-put or fail-in-place function.

 

As long as an electric signal is applied to the solenoid as well as air pressure is applied to the external pilot port,
the valve forwards the signals from the pilot valve to the actuators. If the electric signal or air pressure at the external pilot port cuts off, the actuator is blocked.

 





mneh 611 611                                    Electrically actuated vent valve


The MNEH 611 611 is made for blocking the air supply from the pilot valve to the actuator and exhausting the actuator.

 

As long as an electric signal is applied to the solenoid as well as air pressure is applied to the external pilot port,
the valve forwards the signals from the pilot valve to the actuators.
If the electric signal or air pressure at the external pilot port cuts off, the actuator is exhausted.






pressure holding valve                                  Pressure holding valve

The DSVN-5 is designed to hold a double acting actuator in the current position if the pressure supply cuts off.
The valve is comprised of two non-return valves, which are unlocked by pressurising port P1 or P2.

 






short cut valve                                  Short-cut valve


In the case of automated process valves which are equipped with a manual gear box, it has to be ensured that no air is trapped inside the actuator in case of manual operation.
The HAFNER short-cut valve connects both actuator chambers with each other so that the air can flow from one chamber into the other.
The user doesn’t have to close the process valve against any air pressure.




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