Tank Bottom Valves D-tec® N/DV

D-tec® single-seat tank bottom valves are used for the monitored control of fluids at tank applications. The valves are an ideal fit for UltraClean applications but can also be operated aseptically.

The D-tec® stem diaphragm prevents the ingress of microorganism from the atmosphere into the product and thus increases product and process safety. The innovative connection between valve stem and stem diaphragm minimizes the mechanical stress for the hermetic sealing element.

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, high dimensional stability with temperature resilience and cleanability. D-tec® shut-off valves can be equipped with a soft-sealing (i.e. EPDM) or a hard-sealing (TEFASEP® gold) valve seat seal.

Actuator
The actuator size, which is chosen based on process and installation requirements, contributes to low air and energy consumption. Depending on the valve operation, various actuator options are available and the valve can be ideally adapted to customer requirements. The actuator includes an interface to mount a T.VIS® control top onto the valve and the internal air supply reduces the risk of failures with external hoses.

Lantern
The lantern connects actuator and 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 D-tec® stem diaphragm and is furthermore designed for a safe and easy visual detection of leakages.

Control and feedback system
D-tec® divert valves can be equipped with T.VIS® control tops M-15 and A-15. 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® diaphragm
Valve seat seal material	EPDM
Surface quality in product area	R_a ≤ 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	5 bar
Control air pressure	6 bar
Hermetic sealing element	D-tec® diaphragm
Valve seat seal material	TEFASEP® gold
Surface quality in product area	R_a ≤ 0.8
Material quality in product area	AISI 316L
Max. operating temperature	+ 150 °C
Max. sterilization temperature	+ 160° for 30 min

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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.

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 a_w-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"