Unique DV-ST UltraPure

The Unique Diaphragm Valve UltraPure meets the requirements of most sterile and ultra-hygienic processes. These compact, lightweight valves are modular in design, which enables a wide range of purpose-built configurations.

DV ST Ultrapure diaphragm valve

Superior hygienic design

Alfa Laval diaphragm valves is the natural choice for the pharma and biotech industries. However the diaphragm valve offers solutions for all hygienic industries. The diaphragm valve is also an obvious choice in aseptic, hygienic and utility systems within the dairy, beverage and food industries for duties such as dosing, filling, diverting and controlling.

The Alfa Laval Unique DV-ST UltraPure range consistently delivers documented, reliable, and contaminant-free aseptic performance.

High-quality valve bodies

Low delta-ferrite content valve bodies with specified sulphur content are standard for all forged and block valves.

  • Cast bodies are made from high-precision investment casting with low delta-ferrite content.  
  • Two-way valves, including the ferrules for clamp end bodies, are made from a single piece of metal.
  • T- and Tank-outlet valves are available either machined from block or forged and welded.

The forged and welded valve bodies offer an economical lightweight alternative, which makes easy installation and efficient steam sterilization possible.

Wide range of well proven diaphragms

Alfa Laval’s broad range of well documented pharmaceutical grade diaphragms meet the requirements of FDA and USP classifications as well as TSE/ADI declarations. A high performance EPDM diaphragm for continuous steam operation at temperatures up to 150 °C extends the lifetime of valves used in more demanding process environments.

Simple and reliable actuator design

The stainless steel actuator provides a one type fits all on the complete range of Alfa Laval Unique DV-ST diaphragm valves making selections safe, fast and easy.

The actuator is designed to operate up against 10 and 6 bar working pressures depending on diaphragm material (6 bar for TFM/PTFE and 10 bar for EPDM and PTFE/EPDM). This further means it’s a durable actuator that also can close against the same working pressures (0% pressure drop).

The Alfa Laval designed stainless steel actuator is compatible to heat (autoclave) and chemicals providing long life time and performance minimizing errors and increasing uptime.

Over-closure protection for all handles used for manual operation ensures a defined closure pressure against the diaphragm and prolongs diaphragm lifetime as well. All steel parts are made of stainless steel steel or Composite material depending on handle type selected.

Modular valve design

Create exactly the configuration you require. The Unique DV-ST UltraPure is constructed from a series of base parts that enables you to easily adapt the valve to the individual needs of a wide range of applications. See Documentation and How it works.


Automation & control




Valve Bodies

Multi-port valves

Aseptic diaphragm valves

Alfa Laval diaphragm valves are built around a weir-type aseptic system. This is available with a range of hard and soft compounds, extending from PTFE with EPDM as backing plate to EPDM with a Kevlar core for extra mechanical stability.

Alfa Laval aseptic diaphragm valves can be operated by handles or pneumatic actuators. Such actuators can be fitted with an extensive range of sensing and control equipment, including control units, position indicators, stroke limiters and valve positioners for regulating purposes.

Well documented to safeguard quality

Equipment and components in the Alfa Laval BioPharm portfolio are supplied with Alfa Laval Q-doc, a comprehensive documentation package that provides full transparency of the entire supply chain, from raw material to final equipment delivery. This smoothes purchasing and installation procedures as well as facilitates qualification, validation and change control procedures. Based on GDP (Good Documentation Practice), Alfa Laval Q-doc covers every aspect of biotech and pharmaceutical equipment supply and provides customers with transparent and well-documented quality assurance of the sourced equipment.

Product Benefits

  • Superior hygienic design
  • Contaminant-free aseptic performance
  • High-quality valve bodies


Pharmaceutical water system

Catalogue produits

Dernière version en ligne du catalogue "A portée de main"  

Accédez à la version française




The standard Unique DV-ST UltraPure consists of a valve body, diaphragm, handle or actuator. Optional sensing and control units are available. With a full modular design, the Unique DV-ST UltraPure can be built to meet virtually any demand within the biotech and pharmaceutical industries.

Operating principle

The standard Unique DV-ST valve range is designed either for manual operation or for automatic operation.

Manual operation

For manual operation, the Unique DV-ST UltraPure is controlled by means of a handle. A simple turn of the handle will push the compressor downwards on the diaphragm, pressing the diaphragm against the weir of the valve body thereby closing the valve.

The handle can be made of full stainless steel or stainless steel composite. All have a standard optical positioner and over closure protection. The handle is fitted onto the valve by means of four screws and bolts.

Automatic operation

The Unique DV-ST UltraPure can be controlled from remote location by means of compressed air using a pneumatic actuator. The actuator controls the axial movement of a piston, thereby opening or closing the valve depending on the actuator function.

The actuator is available in three standard versions: normally closed (NC), normally open (NO) and air/air activated (A/A). The actuator is fitted on to the valve by means of four screws and bolts.