Valve Parts: Important components of industrial valves

Overview of Valve Parts

Valve parts can be categorized into primary components and auxiliary parts. The primary components directly affect the valve's mechanical function and sealing performance, while auxiliary parts serve to enhance operational efficiency, safety, and maintenance.

Primary Components:

Auxiliary Components:

Material selection for valve parts is driven by the application's pressure, temperature, and fluid media requirements. Below is a comparison of common materials used for valve components:

Expert Insights:

• For aggressive media (e.g., acids, seawater), Hastelloy and Monel are the go-to choices due to their superior corrosion resistance.

• 17-4 PH stainless steel stems offer high strength and excellent corrosion resistance for high-pressure applications.

• Cryogenic valves typically utilize PTFE seats combined with stainless steel discs for optimal sealing at low temperatures.

The performance of valve parts is highly dependent on the manufacturing process. The three main processes in valve part production are:

Investment Casting

Widely used for complex valve bodies and trim components due to its ability to produce near-net shape parts with high surface finish quality.

• Tolerance: ±0.1 mm

• Common Materials: Stainless Steel, Duplex Steel

• Applications: High-precision valve bodies, valve seats

  
  

Hot Forging

Ideal for high-strength components like valve stems and discs. Hot forging improves the mechanical properties of metal by refining the grain structure.

• Tolerance: ±0.3 mm

• Common Materials: Carbon Steel, Alloy Steel, Stainless Steel

• Applications: High-pressure valve stems, heavy-duty discs

Precision Machining

CNC machining is used to achieve final dimensions and surface finishes for critical components like valve seats, stems, and custom trim.

• Tolerance: ±0.01 mm

• Applications: Custom valve trim, high-performance seats

The selection, manufacturing, and quality control of valve parts directly impact the performance and lifespan of industrial valves. Understanding the interplay between material properties, production methods, and testing standards enables manufacturers and end users to select the most suitable components for each application.

In 2025, the demand for customized valve components will continue to grow, especially in sectors requiring corrosion resistance, extreme temperature performance, and high-pressure applications. Partnering with experienced manufacturers who offer investment casting, hot forging, and precision machining capabilities will ensure both quality and reliability in industrial valve assemblies.