KF16/25/40/50 Aluminium Alloy Clamp

The KF16/25/40/50 Aluminium Alloy Clamp is engineered using a wide selection of over 60 material grades and more than 12 aluminum alloy systems, supporting the production of over 70 different component types. With a tooling base of 3500+ precision casting molds and 1000+ sand casting molds, we ensure dimensional accuracy and repeatability across both small and large-batch manufacturing.

Production capabilities cover a broad range—from single-piece custom castings of 50 kg up to 850 kg, enabled by multiple independent furnace lines. This ensures rapid alloy switching and controlled melt quality, critical for applications demanding metallurgical precision. The KF16/25/40/50 Aluminium Alloy Clamp supports tight-tolerance machining, with optional surface treatments and post-processing certificates provided for high-spec orders.

Each clamp is fully traceable, backed by a 3.1 Material Certificate for every furnace batch. Upon request, customers may commission third-party inspection to obtain EN 10204 3.2 certification. For high-precision components, a machining certificate can also be issued. With over 20 years of foundry expertise and continuous R&D since the 1980s, our production of KF16/25/40/50 Aluminium Alloy Clamp sets the benchmark for reliability in demanding industrial environments.

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.