Since 1879
Hygiene Ventile von Rieger

Double seat tank bottom seat valve N9 - hygienic


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.



Material product contact optional not product contact 1.4404/AISI316L
Seals  O-rings/gaskets EPDM
Temperatures maximum   EPDM
  operating temperature

sterilisation temperature
  130 °C*

150 °C* short-time (approx. 20 min)
Operating pressure closing pressure

control air pressure
max. 4 bar in the Tank
max. 10 bar in the Pipe
min 6 bar -
max. 10 bar
Surfaces product contact

not product contact
Ra <= 0,8 µm
e-polished, other surfaces on request
Ra <=1,6 µm
Connections Standard- pipe classes DIN 11850-R2 (DIN 11866 A)
O.D.-Tube (DIN 11866 C)

DN 50 - DN 100 or from 2" - 4"

  • available with turned-to-body flange,
  • alternatively with separate weld-in flange
  • or pipe end to the tank
  • also available with only one port
  • one-piece solid valve housing
  • no welding distortion
  • water hammer safe up to 20 bar
  • balanced valve disk
  • low control air consumption
  • standard actuator with lift function
  • service possible without compressed air
  • Valve seat removable downwards
  • radial sealing of both valve seats
  • in the product area only 4 seals
  • seal replacement without special tools
  • contact with product 316L
  • inner surface Ra <= 0,8 µm (standard)
  • leakproof up to 4 bar tank pressure and 6 bar pipe pressure


Recommended Bürkert control tops for aseptic valves with 24 VDC or ASI bus

Contactless position with three switching points (teach-in function) with 3 internal feedback sensors, 1 output for external feedback (external feedback not included)

Two alternatives:

© Bürkert
24V DC with 4 digital outputs screw terminals, cable gland:
AS-Interface with a maximum of 62 slaves flat cable clamp with 1 m cable
  • 0 solenoid valve e.g. for single seat valves - pure feedback function
  • 1 solenoid valve for e.g. for single seat valves with actuators NC or NO
  • 2 solenoid valves for e.g. for single seat valves with air/air actuator or double seat valves N5, N9
  • 3 solenoid valves for e.g. double seat valves N1, N2, N3, N4, N7, N13
For more details see website Bürkert


the ATEX selection
chart in
PDF as download
… click here

Gebr. Rieger GmbH & Co. KG
Kochertalstraße 32
73431 Aalen - Germany

Tel.: +49 (0) 7361 - 5702-0
Fax: +49 (0) 7361 - 5702-51

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Gebr. Rieger GmbH & Co. KG
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