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.

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

Valve bodies have low delta-ferrite content and defined sulphur content as standard in all forged and block valves. 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 machined from block in a multitude of configurations and materials.

The aseptic diaphragm valves are built around a weir-type design and is available with hard or  soft compounds from PTFE with EPDM as backing to a pure EPDM diaphragm. They 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.

Service and reliability

The 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 is constructed from a series of base parts that enables you to easily adapt the valve to a wide range of applications.

How it works


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 actuator controls the piston’s axial movement 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) and is standard available for ATEX demands.


Ten top tips - Valves

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

single seat valves 640x360

Product catalogue

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

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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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Technical articles

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