Hygienic Mix Proof Change Over Valves N3

Zertified according to the "Kieler guideline" (link to certificate).

The valves are tested by the Technical University Weihenstephan in Munich for tightness, cleanability and maintenance. The valves are easy to clean in place and assembly/disassembly can be done without special tools.

Materialin contact with product
not in contact with product


(others on request)

 continuous operation
steam sterilization
 130 °C*
150 °C* short-time
(approx. 20 min)
closing pressure

air pressure
max. 10 bar
min 6 bar -
max. 10 bar
in contact with product

not in contact with product
Ra ≤ 0,8 µm
e-polished, other surfaces on request

Ra ≤ 1,6 µm
Standard- pipe
DIN 11850-R2 (DIN 11866 A)
O.D.-Tube (DIN 11866 C)
                                                                                 *dependent upon operating conditions
N3-001, 2-piece body
N3-300, 3-piece body
Version N32
Port configurations as shown
in picture or in 360° possible.
  • one-piece solid valve body
  • no welding distortion
  • water hammer safe up to 30 bar
  • both valve disks are balanced
  • low control air consumption
  • light: DN 100 = 4" only 35 kg
  • standard actuator with 3 lift functions
    (open, upper seat lift, lower seat lift)
  • by lifting of both disks easy cleaning
  • service possible without air supply
  • valve seat removable from the top
  • radial sealing of both valve seats
  • only 4 gaskets in the product area
  • maintenance without special tools
  • stainless steel contact with product 316L
  • inner surface Ra ≤ 0,8 µm (standard)
  • also available in 3-A version


  • DN 25 – DN 200
  • 1" – 8"

This control top has been developed between AWH and Rieger in collaboration with Bürkert. It serves as a custom-fit solution for our in-house hygienic and aseptic process valves to achieve an even more efficient and precise application.

Contact-free inductive valve position measuring (Teach function)

  • status display luminated in colour
  • integrated control air supply to the actuator
  • field bus port AS-interface, DeviceNet, IO-Link or Bürkert system bus (büS)
  • with ATEX-option:
    Ex II 3 G Ex ec IIC T4 Gc X

    Ex II 3 D Ex tc IIIC T135°C Dc X

FlowStar is available in the models 24 V DC, AS-I bus, IO-Link (Port Class A) or Ethernet IP.
All models  are available as the following alternative:

  • 3 solenoid valves, 3 internal proximity switches + 1 outlet for external proximity switch

Mounting kit integrated in Control Top – no separate mounting kit necessary. Exception for LCV valves, ESV valves.

All Valves are available in special alloys, such as Hastelloy® C-22, 1.4539/904L, 1.4529, AL-6XN® and others.

Directly send us your inquiry:
Tel.: +49 7361 5702-0