D-tec® control valves are used for the exact setting and control of parameters such as flow, pressure, temperature, or filling level in processing plants.
An electro-pneumatic positioner enables the exact setting of the valve stem by controlling the pneumatic actuator. The D-tec® stem diaphragm prevents the ingress of microorganism from the atmosphere into the product and thus increases product and process safety.
Main Components
Housing
The height of the dead-space-free housing exactly corresponds to the diameter of the connection pipeline and therewith avoids domes and sumps. Numerous housing combinations based on a clamped seat ring design are available.
Internal assembly
The hermetically sealing D-tec® stem diaphragm is the key element of a D-tec® valve. It is characterized by a very long service life and high dimensional stability with temperature resilience and cleanability. The valve seat can be executed wih a metallic stop, with a soft-sealing (i.e. EPDM) or a hard-sealing (TEFASEP® gold) valve seat seal. D-tec® Control valves provide equal-percentage control cone characteristics and different Kvs values are available for each valve size.
Actuator
The actuator size, which is chosen based on process and installation requirements, contributes to low air and energy consumption. Depending on the valve task, various actuator options are available and the valve can be ideally adapted to customer requirements. The actuator contains an integrated interface for mounting a T.VIS® position controller by default and the internal air supply reduces the risk of failure with external hoses.
Lantern
The lantern connects actuator and product 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 D-tec® stem diaphragm and is furthermore designed for a safe and easy visual detection of leakages.
Position Controller
D-tec® control valves are equipped with T.VIS® P-15 position controllers by default. They enable seamless integration of the valves into an automated processing plant.
Technical data of the standard execution – soft sealing
| Item | Size |
| Nominal pressure valve | 6 bar |
| Closing pressure | 5 bar |
| Control air pressure | 6 bar |
| Hermetic sealing element | D-tec® stem diaphragm |
| 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 (275 °F) |
| Max. sterilization temperature | 150 °C (302 °F) for 30 min |
Technical data of the standard execution – hard sealing
| Item | Size |
| Nominal pressure valve | 6 bar |
| Closing pressure | 5 bar |
| Control air pressure | 6 bar |
| Hermetic sealing element | D-tec® stem 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 (302 °F) |
| Max. sterilization temperature | 160 °C (320 °F) for 30 min |
Technical data of the standard execution – metallic stop
| Item | Size |
| Nominal pressure valve | 6 bar |
| Closing pressure | 5 bar |
| Control air pressure | 6 bar |
| Hermetic sealing element | D-tec® stem diaphragm |
| Valve seat seal material | Metallic stop |
| Surface quality in product area | Ra≤ 0.8 |
| Material quality in product area | AISI 316L |
| Max. operating temperature | 150 °C (302 °F) |
| Max. sterilization temperature | 160 °C (320 °F) for 30 min |
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D-tec® Valve Technology
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.
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
Overview
| 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″ |
