The valve body of the RIEGER aseptic valves is hermetically sealed from the environment, thus ensuring the perfect protection for your liquid product. The pocket-free design of the valve body and the optimum surface make it an indispensable part of sterile process engineering in food technology and pharmaceuticals. Thanks to the modular design the reconstruction of aseptic into hygienic version, of "air to open" on "air to closed", of liquid on fibrous and particulate media no problem. The dimensions can be adapted to local conditions. Even under special conditions such as high sterilization temperatures RIEGER Aseptic valves meet all requirements regarding reliability and reliable operation.
Tightness outwards and inwards by helium leak test (TA-Luft certified) has been exemplarily tested on bottom seat and BioCheck sampling valve.
Advantages of PTFE bellows over conventional metal bellows are clear:
PTFE (TFM 1705)
metal 1.4571/1.4404
Temperature resistance
121 °C constant temperature 135 °C short-term
150 °C Temperature resistance 160 °C short-term
media resistance
to almost all products and cleaning agents
depending on the O-ring material
life time
depending on the version up to 10,000,000
depending on the version up to 200,000
Cleanability
very well, as block resistance (rectangular contour) with free gap of 1 to 1.5 mm and no deposit build-up
Folds may roll over when opening, Deposits behind O-ring are possible.
Maximum damage
Overburdened spot turns bright white and bellows flows → cannot tear
In case of damage, the entire bellows rips through the entire cross-section.
Aseptic process reliability
one-piece - fully aseptic because no other seals
Requires at least 2 O-rings, which may be soiled behind.
Price for Spare bellows
The metal bellows is more expensive by a factor of 3-4.
