Since 1879
Rieger Ventilprogramm

Aseptic process valve or aseptic double-chamber valve N7


for pipelines
PTFE-metal combi bellows
for use in granular media such as with fruit Yoghurt
The reliable separation of two process lines is achieved via the CIP/SIP capable leakage chamber of the RIEGER-double seat valve N7 (also called double chamber valve. The CIP/SIP valves control the steam inlet and condensate outlet at the leakage space. 
The excellent aseptic properties are achieved by the hermetic separation of the ambient.

Rieger relies in the fruit sector e.g. yoghurt with strawberries not on the metal bellows, but on the PTFE-metal combi bellows which connects the durability of the PTFE bellows (more than 1 million cycles) with the erosion-free sealing technology of the O-ring!

This type of valve is available not only for pipes, but also for tank attachment .

This valve is indispensable in aseptic valve clusters and aseptic filling machines, in which the highest value is placed to comprehensive product safety.



Another variation is the aseptic double seat valve N7 (also called double chamber valve) as a tank discharge valve. Like in the version for pipe,the separation of product from the environment is completely guaranteed. 
The PTFE bellows ensure due to their novel design extremely long shelf life (more than 1 million strokes). When opening the valve the folds are not on block, so that the folds always remain open like in the single-seat aseptic valves and can be cleaned properly. Unlike metal bellows, which need for sealing O-rings, here the PTFE bellows is the only sealing element, that the valve interior from the environment hermetically seals without dome or dead space.
Material product contact optional not product contact 1.4404/AISI316L
Seals PTFE bellows metal bellows O-rings/gaskets PTFE
Temperatures maximum EPDM PTFE
  operating temperature

sterilisation temperature
130 °C*

150 °C*
121 °C*

135 °C* short-time (approx. 20 min)
Operating pressure closing pressure

control air pressure
max. 6 bar in the pipe
max. 4 bar in the tank
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)
Construction of the valve massive valve housing
no dead spaces
completely draining
many possible installation orientations
Absolute product protection perfect isolation from the environment
no sump, no dome
Serviceability seal replacement without special tools
low downtime
screwed bellows
perfectly cleanable
Efficiency long lifetime of PTFE bellows
standard seals
minimal maintenance costs
Additional certificates in 3-A-design or with TA-Luft certificate (the bottom seat valve) possible


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

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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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