KF40 Aluminium Alloy Clamp

Engineered for medium-scale vacuum systems and precision assemblies, the KF40 Aluminium Alloy Clamp combines structural integrity with versatile manufacturing capabilities. Manufactured using a robust library of over 60 certified material types and dozens of specialized aluminum alloy formulas, it ensures compatibility across 70+ standardized components in demanding technical environments.

With access to 3500+ precision casting molds and 1000+ sand casting dies, we support rapid development and flexible batch production—from one-off 50 kg prototypes to consistent output of components up to 850 kg. Whether for standalone or modular integration, the KF40 Aluminium Alloy Clamp maintains excellent surface quality and mechanical stability, essential for vacuum sealing and high-precision positioning.

Backed by 20+ years of continuous metallurgical expertise, our production process is led by industry veterans who began their craft in the early 1980s, ensuring not only manufacturing precision but also engineering foresight. Every KF40 Aluminium Alloy Clamp is fully traceable, with a 3.1 Material Certificate issued for each melt batch. Upon client request, we offer coordination with independent third-party agencies to obtain EN 10204 3.2 certification, adding another layer of quality assurance. For high-tolerance machined versions, a dedicated processing certificate is also provided.

El KF40 Aluminium Alloy Clamp offers the ideal balance between scalability, durability, and technical compliance—an optimal solution for critical systems where performance and documentation go hand in hand.

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.