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Application Scenarios for Stainless Steel Sanitary DIN 11851 Threaded Butterfly Valves
I. Product Overview
The Stainless Steel Sanitary DIN 11851 Threaded Butterfly Valve is a fluid control valve specifically designed for industrial applications requiring high levels of cleanliness. It utilizes an external threaded connection method compliant with the DIN 11851 standard. Constructed from high-quality stainless steel materials (such as 304, 316, and 316L), the valve features seals made from food-grade silicone rubber or PTFE (Polytetrafluoroethylene), thereby meeting international sanitary standards. The entire valve undergoes an electropolishing treatment, resulting in a smooth, refined surface finish that ensures no dead zones or areas of accumulation occur during fluid flow, effectively preventing potential contamination risks.
From a structural perspective, this butterfly valve falls into the category of centerline soft-sealed butterfly valves; its closing mechanism consists of a circular disc (butterfly plate) mounted across the diameter of the pipeline. The valve operates via the rotation of a stem, executing a rotational movement ranging from 0° to 90°; when rotated to the 90° position, the valve is in a fully open state. This design ensures minimal fluid resistance when the valve is fully open, while simultaneously enabling sensitive and precise flow regulation within an opening range of 15° to 70°. Consequently, this type of valve is widely utilized in industrial piping systems.
II. Core Application Fields
2.1 Food Processing Industry
The food processing industry constitutes one of the primary application fields for stainless steel sanitary threaded butterfly valves. During food production, requirements for sanitary conditions are extremely rigorous; any metal component of a valve that comes into contact with the process medium must meet food-grade safety standards. Thanks to their high-quality materials and precision polishing processes, this series of valves is capable of meeting the strict demands of various food processing operations. In dairy production lines, these valves are utilized to control fluid flow during critical stages such as pasteurization, homogenization, and fermentation; in juice and beverage production, they manage pipeline control for processes including blending, sterilization, and packaging; and in the edible oil processing sector, they facilitate the conveyance, filtration, and filling of oils and fats. Furthermore, the valves feature a "no dead-angle" design, and their sealing materials comply with FDA regulations for food-contact materials; this effectively prevents metal contamination of food products during production, thereby safeguarding the safety and quality stability of the final product.
2.2 Pharmaceutical Industry
The pharmaceutical industry imposes production equipment requirements that are second only to—and in some aspects, even more stringent than—those of the food industry. The application of stainless steel sanitary threaded butterfly valves within the pharmaceutical sector focuses primarily on the following areas: purification water preparation and distribution systems, fluid control in sterile preparation production lines, medium transfer during active pharmaceutical ingredient (API) synthesis, and filtration and filling operations prior to drug packaging. The 316L stainless steel material utilized in these valves offers superior corrosion resistance, enabling it to withstand the corrosive effects of various acidic, alkaline, and organic solvent solutions commonly employed in pharmaceutical manufacturing processes. Sealing materials—such as silicone rubber, fluororubber, or PTFE—can be selected based on the specific characteristics of the process medium, thereby ensuring reliable sealing performance across a wide range of pharmaceutical fluid environments. Moreover, these valves support CIP (Clean-in-Place) and SIP (Sterilize-in-Place) protocols, allowing for in-situ high-temperature cleaning and sterilization treatments that fully comply with the requirements of GMP (Good Manufacturing Practice) regulations for pharmaceutical production quality management.
2.3 Dairy and Brewing Industries
The dairy and brewing industries represent some of the most concentrated fields for the application of sanitary-grade valves. In the dairy sector, these valves are deployed within the pipeline systems of various production units, including raw milk reception, pasteurization, fermentation (for yogurt production), standardization, concentration, and drying. The brewing industry primarily utilizes these valves for process control during the production of alcoholic beverages—such as beer, wine, and spirits—encompassing fluid management across stages including wort preparation, mashing, fermentation, filtration, and bottling. A shared characteristic of these two industries is the frequent need for equipment cleaning and sterilization during production; consequently, there are stringent requirements regarding the valves' temperature resistance and chemical compatibility. Stainless steel sanitary threaded butterfly valves typically operate within a temperature range of -20°C to +150°C, enabling them to withstand high-temperature cleaning and steam sterilization processes while ensuring that their sealing materials retain excellent elasticity and sealing integrity even under conditions of repeated thermal cycling.
2.4 Bioengineering and Biochemical Industries
The bioengineering and biochemical technology sectors have experienced rapid growth in recent years, driving a continuous increase in demand for high-purity fluid control equipment. In bioreactor systems, these valves are employed to control the transport and distribution of nutrient solutions, culture media, and buffer solutions; in cell culture and fermentation processes, they are used to regulate the flow of gases and liquids; and during protein purification and extraction, they facilitate pipeline control for various buffers and solvents. Applications within the biochemical industry also extend to fields such as diagnostic reagent production, blood product processing, and vaccine manufacturing. These specific application scenarios impose extremely rigorous requirements on the valves' material purity, surface finish, and biocompatibility. The mirror-polished finish of stainless steel sanitary threaded butterfly valves (achieving a surface roughness of Ra ≤ 0.8 μm) ensures that the interior surfaces of the valve body remain smooth and non-porous, thereby effectively preventing microbial proliferation and the retention of residual media—a critical factor in meeting the exacting standards of biopharmaceutical production.
2.5 Daily Chemicals and Cosmetics Industries
The production of daily chemical products and cosmetics also necessitates the extensive use of sanitary-grade valves to control the transport of various fluid media. Within the cosmetics industry, these valves are utilized in the manufacturing processes for products such as skin creams, lotions, shampoos, body washes, and perfumes. In the broader daily chemicals sector, they are primarily employed in the production of household care items, including laundry detergents, dishwashing liquids, and disinfectants. Although the production of these types of products does not typically demand the strictly sterile environments required in the pharmaceutical industry, there remain high standards regarding equipment cleanliness and material safety. The food-grade sealing materials utilized in these sanitary stainless steel threaded butterfly valves do not chemically react with product ingredients, thereby ensuring the chemical stability of the products. Furthermore, the valves' smooth surfaces and quick-disassembly design facilitate the cleaning and maintenance of production equipment, effectively meeting the process requirements for the large-scale, continuous manufacturing of daily chemical products.
III. Technical Features and Advantages
3.1 Materials and Surface Treatment
The main components of the stainless steel sanitary threaded butterfly valve—including the valve body, disc, and stem—are all manufactured using high-quality stainless steel materials. Commonly used materials include 06Cr19Ni10 (equivalent to SUS304) and 06Cr17Ni12Mo2 (equivalent to SUS316L). Among these, the 316L material—due to its molybdenum content—exhibits superior resistance to pitting and crevice corrosion, making it particularly suitable for applications involving media containing chloride ions. All parts in contact with the process media undergo precision polishing; the surface roughness can reach Ra ≤ 0.8 μm, while certain high-end models can achieve a mirror-finish grade of Ra ≤ 0.4 μm. This high-gloss surface treatment is not only aesthetically pleasing but, more importantly, eliminates microscopic depressions and pores, thereby eradicating "dead zones" where media can accumulate. This fundamentally prevents the risk of microbial proliferation and cross-contamination.
3.2 Connection Methods and Sealing Performance
The DIN 11851 standard defines the specifications for threaded connections in sanitary piping systems. This series of valves utilizes an external threaded connection method, equipped with a dedicated nut and sealing gasket, allowing for rapid connection between the valve and the pipeline during installation via the nut. Compared to welded connections, threaded connections offer the advantage of easy assembly and disassembly, facilitating equipment maintenance, inspection, and replacement. Furthermore, compared to clamp connections, threaded connections demonstrate superior sealing reliability under certain operating conditions. The valve's centerline soft-sealing structural design ensures excellent sealing performance under both positive and negative pressure conditions. The sealing test pressure is typically set at 1.1 to 1.76 times the rated pressure, guaranteeing zero leakage under actual operating conditions.
3.3 Operation Modes and Actuator Configurations
The stainless steel sanitary threaded butterfly valve supports various operation modes to meet the diverse requirements of different application scenarios. Manual operation models are configured with round-head pull handles, square-head pull handles, or positioning handles. These mechanisms require minimal operating torque and allow for rapid opening and closing; typically, the valve position can be fixed at 15-degree increments within a 90-degree range, enabling precise regulation of flow rates. For pneumatic actuator models, users may select from normally open, normally closed, or double-acting configurations based on specific requirements. Operating on an air supply pressure typically ranging from 5 to 10 bar, these units offer rapid response speeds and are ideally suited for automated production lines requiring frequent cycling or remote control capabilities. Electric actuator models, conversely, support a variety of power supply configurations—including AC 110V, 220V, and 380V, as well as DC 24V—and accept 4–20 mA analog signals for flow modulation, thereby enabling seamless integration with industrial automation control systems.
IV. Applicable Media and Operating Parameters
The range of media suitable for the stainless steel sanitary threaded butterfly valve is extremely broad, essentially encompassing all types of fluids encountered in industrial production. Liquid media include water, pharmaceuticals, edible oils, steam, neutral gases or liquids, dairy products, organic solvents, acidic and alkaline solutions, and various other process fluids; gaseous media include clean compressed air, nitrogen, inert gases, and the like. Regarding special media, certain valve configurations equipped with specialized sealing materials can also be utilized for the control of powdery and granular substances. The typical technical parameter range for the valve is as follows: Nominal Diameter (DN) from 15 to 250 (or 1 inch to 6 inches), Nominal Pressure (PN) from 0.6 to 1.6 MPa, and Operating Temperature from -10°C to +150°C (depending on the selected sealing material). When selecting a valve, it is essential to choose the appropriate combination of valve body material and sealing material based on the specific characteristics of the media, the prevailing temperature and pressure conditions, and applicable sanitary requirements.
V. Key Points for Installation and Maintenance
Prior to installation, both the piping and the valve must be thoroughly cleaned to ensure that the sealing surfaces are free of scratches and contaminants; this prevents internal leakage and extends the product's service life. During installation, it is imperative to carefully verify that the valve's connection threads match the specifications of the piping. A sealing ring—compliant with relevant standards—must be installed at the junction between the valve and the pipe to ensure a reliable, leak-proof connection. The valve offers flexible installation options and can be mounted on either horizontal or vertical piping. Before introducing pressurized media and putting the valve into service, the handle should be rotated to both the fully open and fully closed positions to verify the integrity of both the internal and external seals. Should any leakage be detected, the condition of the sealing components must be re-examined, or the sealing ring replaced. If internal leakage persists when the valve is in the closed position during operation, it is typically necessary to replace the sealing ring and re-install the valve correctly. The valve's design, which facilitates rapid disassembly and assembly, makes routine maintenance and servicing highly convenient, thereby significantly reducing equipment downtime and enhancing production efficiency.
