D-tec® valve line

Double-chamber Valves D-tec® D/DV

D-tec® double chamber valves are used for the mixproof shut-off of incompatible products at pipe junctions. The valves are an ideal fit for UltraClean applications but can also be operated aseptically.

D-tec® stem diaphragms are used to hermetically seal the product area from outside contamination. The integrated steam barrier (ISB) enables the safe separation of the product lines with a sterile media and can be safely closed off from atmosphere via the two integrated side valves.

Main Components

Housings for D-tec® double chamber valves are available with three or four connection ports. The valves are produced with standard butt-weld connections suitable for orbital welding by default. Mixed connection port sizes as well as various pipe connections are available upon request.

Internal assembly
The hermetically sealing D-tec® stem diaphragm is the key element of every D-tec® valve. It is characterized by a very long service life, high dimensional stability with temperature resilience and cleanability. The internal assembly of a D-tec® double chamber valve includes two valve seat seals by default which can be equipped with soft-sealing (i.e. EPDM) or hard-sealing (TEFASEP® gold) materials. The lower valve seat corresponds with the nominal width of the valve.
The main valve is equipped with two actuators by default. The main actuator is used to move the valve from its normally closed fail-safe position to the fully open position by applying pressurized air to the internal air supply. The lifting actuator on the other hand is used to lift the two valve seats of the main valve independently during CIP or SIP.
The lantern connects the lift actuator with the product-wetted parts and simultaneously prevents the system from heat transfer between these two valve sections. The lantern has an important supporting and clamping function for the upper D-tec® stem diaphragm and is furthermore designed for a safe and easy visual detection of leakages.
Side valves
The sterile chamber includes an inlet and an outlet valve by default. The fail-safe position (NC or NO) of both side valves can be chosen independently from each other. The outlet can be equipped with integrated temperature probe which enables temperature measuring in the sterile chamber. In addition, the outlet can be configured with a divert valve to directly apply a sterile media also to the drain side of the valve.
Feedback units
D-tec® double chamber valves can be either equipped with open feedback units or T.VIS® control tops by default. The degree of automation at the valve can be adapted to customer needs by means of using one, two or three independent control tops.

Technical data of the standard execution – soft sealing

Item Size
Nominal pressure valve 6 bar
Closing pressure 6 bar
Control air pressure 6 bar
Hermetic sealing element D-tec® diaphragms
Valve seat seal material EPDM
Surface quality in product area Ra ≤ 0.8
Material quality in product area AISI 316L
Max. operating temperature + 135 °C
Max. sterilization temperature + 150° for 30 min

Technical data of the standard execution – hard sealing

Item Size
Nominal pressure valve 6 bar
Closing pressure 6 bar
Control air pressure 6 bar
Hermetic sealing element D-tec® diaphragm
Valve seat seal material TEFASEP® gold
Surface quality in product area Ra ≤ 0.8
Material quality in product area AISI 316L
Max. operating temperature + 150 °C
Max. sterilization temperature + 160° for 30 min

D-tec® Valve Technology

Shut-off Valve D-tec® N/DV – hard-sealing with TEFASEP® gold

D-tec® stem diaphragm valves are characterized by a higher safety protection against contamination from the environment and, thus, warrant microbial stability of the product over the whole process. Although D-tec® valves are fundamentally suited for aseptic processes, we see the main focus with this valve lines in UltraClean applications in the food, beverage and dairy industry. The valves meet the highest hygienic standards required, such as EHEDG and 3-A standards.

Thanks to the hermetically sealing stem diaphragm D-tec® valves contribute to higher product quality and longer product shelf-life as often demanded with UltraClean applications. The innovative connection between valve stem and stem diaphragm minimizes mechanical stress of the diaphragm during switching operations. The D-tec® stem diaphragm sets standards for the service life at proven temperature resilience and cleanability.

The D-tec® valve line is based on the VARIVENT® valve line and offers many advantages because of this – e.g. a high level of flexibility in terms of valve configuration. The result: Economic efficiency for the system operator and optimized stock handling due to reduced diversity of parts at proven quality.

All of our D-tec® valves can be equipped with T.VIS® control tops. They integrate and combine our valves into the automated process plant.
UltraClean applications
The most relevant product parameter for UltraClean applications is shelf-life. It is mostly determined by the pH-value and the aw-value of the product. In addition, sensory properties need to be considered as well as the logistical chain of distribution. One of the advantages of UltraClean processing is the reduced quantity of preservatives needed for maintaining the shelf-life of the product.

Application examples

  • Brewery industry – Beer and mixed beer beverages (e.g. pure yeast cultivation and connection of sterile tanks and filling machines after sterilization)
  • Beverage industry – Water-based mixed beverages (e.g. soft drinks, fruit juice and fruit-based beverages, concentrates, beverages with pulp)
  • Dairy industry – Milk-based and lactic acid-fermented products (e.g. ESL milk, dessert products, crystallizing products such as lactose)
  • Food and beverage industry – Sauces and delicacies (e.g. manufacture of basic fruit ingredients, incl. particulates such as nuts)

D-tec® at a Glance

  • Hermetic sealing by stem diaphragm – ideal for UltraClean applications
  • Innovative connection between valve stem and diaphragm minimizes mechanical stress at the diaphragm during switching operations
  • Integrated rotary disconnection of valve insert and actuator
  • High operational safety due to reliable leakage detection in the event of a ruptured diaphragm
  • Maintenance-friendly design enables reduced plant downtimes
  • Modular principle allows simple conversion, e.g. from hard- to soft-sealing
  • Reduced air wiring effort due to internal air supply
  • Based on proven VARIVENT® philosophy


Valve type Metric Inch OD
Shut-off Valves D-tec® N/DV DN 25 – DN 100 1" – 4"
Divert Valves D-tec® W/DV DN 25 – DN 100 1" – 4"
Control Valves D-tec® P/DV DN 40 – DN 100 1.5" – 4"
Tank Bottom Valves D-tec® N/DV DN 25 – DN 100 1” – 4”
Double Chamber Valves D-tec® D/DV DN 40 – DN 100 1.5” – 4”

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Service products

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