As a core component of fluid control systems, the molding process of electric valves directly impacts their performance, reliability, and service life. The manufacturing of electric valves involves multiple steps, including material selection, precision machining, and assembly. The molding process is crucial for ensuring the valve's structural strength and sealing properties.
The main body of an electric valve is typically formed using casting or forging. Casting is suitable for valve bodies with complex structures. Sand casting or precision casting techniques enable highly precise internal cavity and flow path design. However, castings may contain internal porosity or shrinkage defects, necessitating quality control through X-ray inspection or pressure testing. Forging is suitable for electric valves operating under high-pressure conditions. High-temperature forging densifies the metal grains, significantly improving the valve body's mechanical strength and fatigue resistance. Machining is required after forging to ensure the precise fit between the valve seat and valve core.
Sealing components, such as valve seats and seals, are often produced using injection molding or CNC machining. High-performance engineering plastics (such as PTFE) can be injection molded to create corrosion-resistant, low-friction sealing surfaces, while metal seals rely on precision turning or grinding to ensure leak-free contact with the valve core. Furthermore, the housing of electric actuators is often constructed from die-cast aluminum or welded sheet metal, balancing lightweighting with electromagnetic shielding requirements.
Finally, assembly of the valve body and actuator must be performed in a dust-free environment to ensure the reliability of the electrical and mechanical connections. Rigorous pressure testing and operating life testing ultimately verify the molding process's suitability. The molding process for electric valves must be carefully considered based on material properties and application scenarios, achieving a balance between high performance and cost-effectiveness through continuous optimization.
