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GEA Tuchenhagen Double-Chamber Bottom-Seat Valve DKBS

Aseptic double-chamber bottom-seat valves are flow control devices for aseptic tank applications.

The integrated steam barrier (ISB) enables the safe separation of both product lines via the two seat seals. The integrated function of the single-seat lifting capability permits fully automatic seat cleaning during production. The number of seals and moving parts are reduced to a minimum to provide easy maintenance and low Total Cost of Ownership.The valve enables the total separation of antagonistic media and offers you maximum process safety.

Main components


Bottom-seat housings for double chamber bottom-seat valves are available with one, two, three or four port connections. The valves are produced with standard butt-weld connections by default. Mixed port connection sizes can be delivered upon request as well as various aseptic pipe connections. Bottom-seat valve housings are available with pipe, welded flange or screwed flange connection to the tank.

Internal Assembly 

The upper seat of the internal assembly contains a shrunk valve seat seal made of Tefasep® (optionally PTFE). The lower valve seat seal is available with a shrunk or screwed valve seat seal. In addition to the standard sealant Tefasep®, other sealing materials such as PTFE, EPDM, Viton®, etc., are also available for the lower seat. The nominal diameter of the valve is determined by the larger valve seat (upper seat seal “B” above).


The standard version of the pneumatic actuator is designed as spring-closing / air-opening (NC). Available actuator options include: a drive without single-seat lifting (1 valve stroke), one with the seat-lifting of the bottom valve seat (seat A) and full stroke (2 valve strokes), and finally one with single-seat lifting of both valve seats (seats A+B) and valve full stroke (3 valve strokes).


Due to its solid construction, the GEA clamp enables a pressure stable and safe connection of the main components. The special design with three segments allows a service-friendly handling of the component, even under tight space conditions.

Side valves 

The sterile chamber includes a steam inlet and a drain valve by default. Both valves can be either equipped with normally closed (NC) or normally open actuators (NO), depending on customer specifications. Both port connections on the side valves face downwards the same direction. Furthermore, the drain valve is available with an integrated temperature probe which enables temperature measuring in the sterile chamber.

Feedback units 

Aseptic double chamber bottom-seat valves can be either equipped with open feedback units or T.VIS® feedback systems by default. Feedback units from third party suppliers can be mounted via specially designed adaptors.

Technical Data

Higher closing pressures, other materials, higher surface qualities and higher operating temperatures are available upon request.

Keeping you processing

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