Hyg. Mix Proof Tank Outlet Change Over Valves N9

RIEGER offers as a special on the market this variant of the double seat bottom seat valve, in addition, the function of a changeover valve is realized.
The advantage over the usual pass dual seat bottom seat valves is that the pipeline during filling or emptying of the tank is not filled.
The pipeline is open only to the tank to be filled. Thus, an additional risk of contamination is avoided by otherwise necessary shut-off valves.

Materialin contact with product
not in contact with product

(others on request)
maximum EPDM
 continuous operation
steam sterilization
 130 °C*
150 °C* short-time
(approx. 20 min)

closing pressure

air pressure
max. 4 bar in Tank
max. 10 bar in Pipe
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
pipe classes
DIN 11850-R2 (DIN 11866 A)
O.D.-Tube (DIN 11866 C)
                                                                                 *dependent upon operating conditions
Port configurations as shown
in picture or in 360° possible.
  • with machined weld-in flange or separate weld-in flange or weld-end to tank
  • also available with only one port at valve body
  • one-piece solid valve body
  • no welding distortion
  • water hammer safe up to 20 bar
  • balanced valve disk
  • low control air consumption
  • balanced valve disk
  • low control air consumption
  • standard actuator with seat lift function
  • service possible without air supply
  • valve seat removable from the bottom
  • 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)
  • sealing against 4 bar tank pressure
  • also available in 3-A version


  • DN 40 – DN 100
  • 1,5" – 4"

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