KF50 Aluminium Alloy Clamp

The KF50 Aluminium Alloy Clamp is purpose-built for large-diameter vacuum connections and heavy-duty system assemblies, offering high structural stability and excellent alloy integrity. Fabricated from a carefully selected range of 60+ industrial-grade materials and over a dozen precision-engineered aluminum alloys, it meets the dimensional and performance requirements of 70+ component variants across industrial, laboratory, and automation platforms.

Our production infrastructure includes 3500+ high-precision casting molds and 1000+ sand casting solutions, enabling flexible customization for large-format parts. Single-piece castings from 50 kg up to 850 kg are achievable using multiple dedicated furnaces, ensuring alloy purity and consistent thermal control—critical for the durability expected of the KF50 Aluminium Alloy Clamp in mission-critical applications.

With a production team led by senior engineers and foundry professionals with more than 20 years of hands-on experience—and roots in the industry going back to the 1980s—we ensure every clamp meets strict technical standards. Each KF50 Aluminium Alloy Clamp is delivered with complete traceability, including a 3.1 Material Certificate linked to its corresponding furnace batch. For enhanced compliance, customers may request 3.2 certification issued by accredited third-party testing bodies. Machined components can also be accompanied by a processing certificate, verifying surface precision and final dimensional accuracy.

Robust, verifiable, and scalable—the KF50 Aluminium Alloy Clamp is a top-tier solution for systems requiring maximum mechanical strength and full material transparency.

Leierwo’s advantages in casting precision castings in the valve casting industry

Leierwo has been deeply involved in the precision casting field for many years, particularly accumulating extensive experience in the manufacture of valve components. The company specializes in the production of precision castings made of carbon steel, alloy steel, and stainless steel—materials commonly used in the valve industry. By utilizing advanced technologies such as melt casting and silica sol processes, the company is able to achieve high-precision molding of complex structural parts, meeting the performance requirements of valves under high-temperature, high-pressure, and corrosion-resistant operating conditions. Furthermore, Leierwo emphasizes custom production based on customer drawings, enabling it to better match valve castings to specific customer needs, ensuring product sealing and structural stability.

Main material selection

Valve castings must withstand complex operating conditions such as pressure, temperature, and corrosion. Therefore, material selection should prioritize corrosion resistance, high-temperature strength, cavitation resistance, and good processability. Stainless steel is the preferred choice due to its excellent overall performance.

Common Materials:
Stainless Steel Series:
316/316L: The best choice, resistant to chloride ion corrosion, suitable for marine environments, chemical, and petroleum industries. 304/304L: An economical material suitable for general corrosive environments. 410: Martensitic stainless steel, with some corrosion resistance, suitable for high-temperature steam valves.
17-4PH: Precipitation-hardened stainless steel, with high strength and corrosion resistance, suitable for high-performance valves.

Carbon Steel Series:
WCB (carbon steel general material): Commonly used for general-purpose valves at room temperature.
4130: Suitable for high-temperature and high-pressure valve housings.
Specialty Alloy Series (for high-corrosion/high-temperature environments): 2205 duplex stainless steel: Excellent stress corrosion resistance, suitable for marine and chemical industries. Cobalt alloy (CoCr): such as Co6 and Co12, suitable for valve sealing surfaces with severe high temperature damage.

Key casting service options

Valves have stringent requirements for sealing and pressure resistance, and the choice of casting service directly impacts their functional reliability:

Investment casting: The preferred method for medium- and high-pressure valves. Components such as valve bodies and sealing seats often contain complex internal cavities (such as curved flow paths) and precise mating surfaces (e.g., sealing surface roughness must be ≤ Ra1.6µm). Investment casting can precisely replicate complex shapes, reduce casting defects (such as pores and shrinkage), and mitigate leakage risks. It is particularly suitable for high-pressure valves made of stainless steel and alloys.

Sand casting: Suitable for mass production of low-pressure, large-scale valves. For example, low-pressure gate valve bodies for municipal water supply have relatively simple shapes (mostly symmetrical structures), large production runs, and moderate precision requirements. Sand casting offers significant advantages in terms of low cost and high production capacity.

CNC machining: Focuses on critical mating areas. Valve flanges and stem shaft diameters must precisely align with the pipeline or actuator. After casting, CNC milling and grinding are performed to ensure flatness and perpendicularity tolerances of ≤0.02mm/m, ensuring a tight assembly.