KDV Flow’s DN300 weir-type valve bonnets are engineered to meet the rigorous demands of systems handling corrosive or abrasive media. These bonnet assemblies are essential for maintaining pressure containment, ensuring long-term sealing performance, and supporting ease of maintenance within diaphragm valve configurations.
A frequent concern in process systems is bonnet wear caused by thermal expansion or chemical degradation. KDV addresses this through its use of chemically resistant linings and precision-engineered components. With extensive experience delivering diaphragm valve solutions across Europe, the company has earned recognition for quality and durability in the industrial valve market.
Specification Highlights for DN300 Bonnets
The DN300 bonnet assemblies are manufactured in line with EN 558-1 Series 1, ensuring dimensional consistency for valve body compatibility. Available with linings in ETFE, rubber, or glass, the bonnets are selected based on the chemical compatibility of the process media.
Pressure tolerance typically reaches PN10, and temperature resistance varies with lining type—ETFE, for instance, can accommodate applications up to 150°C. These units are built under ISO 9001-certified processes and comply with relevant PED regulations. Options to meet WRAS or FDA compliance are also available upon specification.
Application Fit Across Process Industries
The DN300 weir-type bonnets are particularly effective in systems used in chemical manufacturing, water treatment, and mineral processing. Their design supports integration into acid dosing systems, abrasive slurry lines, and brine-handling networks.
In water treatment plants, these bonnets pair effectively with weir-type rubber-lined valves, providing long-term corrosion resistance. They are equally suited for clean-in-place (CIP) systems in hygienic processing, where the weir design enables better control and drainage of media.
To understand their broader use across industries, you may refer to this overview on weir-type diaphragm valves in chemical processing.
Design and Material Advantages
The bonnet design features reinforced bolt points and precision sealing grooves that contribute to longevity under frequent actuation. Material choices such as ETFE or rubber provide enhanced protection against acids, caustics, and thermal cycling.
The weir-type structure promotes effective throttling and controlled closure, while simplifying the diaphragm replacement process. This supports operations in reducing system downtime during planned maintenance. When paired with spare diaphragms, these bonnets ensure dependable performance under varying conditions.
For a detailed explanation of how weir designs work and how they benefit valve performance, see this article from Diaval.
Installation and Maintenance Insights
Installation requires proper torque application and alignment with matching valve bodies, especially under automated actuation. KDV’s bonnets are compatible with manual and pneumatic actuators, and they align with operator options for weir valves.
Maintenance intervals typically range from 12 to 18 months, depending on media aggressiveness and duty cycle. Diaphragm wear and seal integrity should be reviewed during each maintenance cycle.
FAQs – DN300 Weir-Type Valve Bonnets
What makes this bonnet suitable for corrosive applications?
Its lining options—such as ETFE and glass—provide high chemical resistance, ideal for acidic and alkaline flows.
Can this bonnet be integrated into automated systems?
Yes, it supports electric and pneumatic actuation compatible with PLC systems.
How does this compare to older models?
This generation features improved sealing geometry and wider diaphragm compatibility.
Are replacement parts readily available?
Yes. Spare diaphragms, bolts, and linings are readily available through KDV’s authorised distributors.
What custom options are available?
Bonnet assemblies can be specified with alternative coatings, port additions, or specialised linings depending on application requirements.
Case Snapshot – Field Success in Germany
A DN300 weir-type bonnet from KDV was recently commissioned in a German municipal treatment plant. Integrated with automated actuators and PTFE diaphragms, the setup achieved a 22% reduction in system downtime within six months. Maintenance staff noted significant improvements in diaphragm longevity and ease of valve servicing.
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KDV Flow’s DN300 valve bonnets stand out for their reliability, chemical compatibility, and long service intervals. Download the technical datasheet or contact our team to request a tailored quote.
