Unique DV-ST UltraPure

Alfa Laval Unique DV-ST UltraPure diaphragm valves are the natural choice for pharma and biotech industries (as well as other hygiene-focused processes). The compact and lightweight valves comprise a series of base parts including valve bodies, diaphragms, actuators and handles. The choice gives you a multitude of configurations to meet the exact needs of your process. All diaphragms used meet FDA/USP classifications as well as TSE/ADI.

DV ST Ultrapure diaphragm valve

High-quality valve bodies and wide range of proven diaphragms

  • Reliable, long life diaphragm – available in high performance EPDM for continuous steam operation at temperatures up to 150 °C
  • Reduced risk of contamination - fully documented, made for aseptic operation with standard low-ferrite valve body (option for high alloy solution)
  • Simple and reliable stainless steel actuator with 5-year warranty – one-type-fits-all design makes selection safe, fast and easy
  • Hygienic design – high-grade valve bodies and low Ra surface finishes
  • Easy installation/validation/qualification and backed by Alfa Laval Q-doc comprehensive documentation package and service partner network
The actuator operates at up to 10 and 6 bar depending on diaphragm material (EPDM and PTFE/EPDM: 10 bar; TFM/PTFE: 6 bar). Autoclavability and chemical resistance ensure long service life and uptime. Over-closure protection (manual version) also helps prolong diaphragm life. All steel parts are made of stainless steel or composite material depending on handle type. There is also a range of easily mounted indication and control units.

Unique DV-ST UltraPure valve technology

Premium as standard, the Unique DV-ST has valve bodies with low delta-ferrite content and defined sulphur content in all forged and block valves. Two-way valves, including the ferrules for clamp-end bodies, are forged from a single block. T- and tank-outlet valves are available and machined from a single block. The hygienic diaphragm valves are available in various configurations and materials. 

Built around a weir-type design, the aseptic diaphragm valves are available with hard or soft compounds from PTFE with EPDM as the backing to a pure EPDM diaphragm. The diaphragm valve can be operated manually or with pneumatic actuators that come with a range of sensing and control equipment, including control units, position indicators, stroke limiters and valve positioners. 

All diaphragms have cure dates and compound tracking available, meet FDA/USP classifications and are TSE/ADI-compliant.

Service and reliability

The diaphragm valves come with Alfa Laval Q-doc, a comprehensive documentation package that provides full transparency of the entire supply chain. This helps smooth purchasing and installation procedures and facilitates qualification, validation and change control procedures. Based on GDP, 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.

Unique design adds value


We have used Unique DV-ST UltraPure valves for a long time, so we know that they are highly reliable and that the membranes are long-lasting.

Horst Neuland, Chief Plant Engineer at Bayer HealthCare in Wuppertal, Germany

Brochure: Alfa Laval Unique DV-ST UltraPure Diaphragm Valves

With its modular design and enhanced compatibility, Alfa Laval Unique DV-ST UltraPure diaphragm valve is constructed from a series of base parts that enables you to easily adapt the valve to a wide range of applications.

Diaphragm valve brochure

How it works


How does the Unique DV-ST Ultrapure work

The standard Unique DV-ST UltraPure consists of a valve body, diaphragm, handle or actuator. In the manual version, a simple turn of the handle pushes the compressor down on the diaphragm, pressing it against the weir of the valve body and closing the valve. You can also use a pneumatic actuator to control the valve. The diaphragm actuator controls the piston’s axial movement, opening or closing the valve, depending on the actuator’s function. The standard all-stainless-steel actuators are available in two versions: the Unique DV-ST UltraPure Slim (SL) for standard duties and the Unique DV-ST UltraPure High Pressure (HP) for more demanding pressures. Both are available as normally closed (NC), normally open (NO), or air/air activated (A/A) valves, as well as in ATEX versions for use in potentially explosive atmospheres.



Ten top tips - Valves

Here are some tips and service videos to show how you keep your hygienic valves in tip top condition

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Close at Hand Catalogue

Alfa Laval's hygienic equipment product catalogue "Close at hand" includes product leaflets, performance curves, links to animations, brochures and lists for ordering purposes.

Close at hand 2019 - Cover image 640x360

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CAD portal

Download the product models in Neutral or Native CAD file formats. It is also possible to download 3D PDF files.

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Visit the animations site and take a look inside a product to see and understand how it works. 

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