Alfa Laval diaphragm valves are ideal for use in sterile and ultra-hygienic processes and supplied with a comprehensive documentation package, Alfa Laval Q-doc, providing full transparency of sourcing, production and supply chains, and traceability of all changes in material, manufacturing procedures or spare parts.
Product detail
| Product code | Alfa Laval DV-ST |
| Capacity | 5,000 l/h – 40,000 l/h |
| Applications | The valves are primarily used in biotech and pharmaceutical industries however they are also widely used in aseptic and hygienic processes as well as in utility systems within dairy, beverage and food industries. |
Working principle
Manual operation
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
Pneumatic operation
The actuator controls the axial movement of a piston, thereby opening or closing the valve depending on the actuator function.
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 standard actuator is prepared for position indication with inductive proximity switches. The actuator is maintenance free. Two inspection holes in the bonnet connecting valve body and actuator allow for easy inspection of the stem seal tightness. Actuated valves are delivered NC (normally closed) and are easily rebuild to NO (normally open).
Technical specifications
| Product code | Alfa Laval - SBV Ball valves |
| Max. product pressure | 1600 kPa (16 bar) |
| Temperature range | -10°C to + 130°C (EPDM) However max. 95°C when operating the valve |
| Actuator | Operating pressure: 600 - 1000 kPa (6 - 10 bar) Temperature range: 4°C to +60°C |
Documentation
All UltraPure valves are delivered with our comprehensive Q-Doc documentation package, which includes:
- 3.1/ MTR traceability certificate corresponding to EN 10204
- FDA - Declaration of conformity to FDA (CFR 21: 177.2600 or 177.1550)
- USP-Certificate of conformity to USP Class VI (Chapter 88, biological reactivity test)
- TSE/ADI -Declaration
(Transmissible Spongiform Encephalopathy/Animal Derived Ingredients) - Surface finish conformity declaration
The following documentation is available upon request:
- Surface finish certificate (Ra test results)
- ATEX certificate
Handle and actuator
The diaphragm valves can be operated by a handle or a pneumatic actuator. Alfa Laval offers 2 different types of manual handles and 1 type of pneumatic actuator.
Documents
