Selecting the right industrial valve requires more than simply matching the valve size to the pipeline. Pressure, temperature, media, valve function, materials, and applicable standards should all be considered before making a selection.

1. Define the Valve Function

First, determine what the valve needs to do.

• Ball valves: Fast and reliable on/off isolation
• Gate valves: Isolation with low pressure drop when fully open
• Globe valves: Flow regulation and throttling
• Butterfly valves: Compact isolation and flow control
• Check valves: Prevention of reverse flow

The valve should be selected according to its intended function and operating conditions.

2. Consider the Medium

The process medium directly affects valve material and sealing design.

Consider whether the valve will handle water, oil, gas, steam, chemicals, slurry, or abrasive media.

For corrosive or abrasive service, special attention should be given to the body, trim, seat materials, and surface treatment.

3. Check Pressure and Temperature

Pressure and temperature are critical selection parameters.

The valve’s pressure-temperature rating must be suitable for the actual operating and design conditions. Common pressure classes include Class 150, 300, 600, 900, 1500 and 2500.

Do not select a valve based on pressure class alone. The material and operating temperature must also be considered.

4. Select the Right Seat Design

Seat design has a major influence on valve performance.

Soft-seated valves are commonly used for general services where temperature and media conditions permit.

Metal-seated valves are often selected for high-temperature, abrasive, or severe-service applications where greater resistance to wear and temperature is required.

For metal-seated valves, ball and seat machining accuracy, surface treatment, assembly, and leakage testing are particularly important.

5. Full Bore or Reduced Bore?

For ball valves, buyers should also determine whether a full-bore or reduced-bore design is required.

Full-bore valves are commonly selected when low pressure drop or pipeline pigging is important.

Reduced-bore valves can provide a more compact and economical solution when a full flow passage is not required.

6. Check Applicable Standards

The valve should be designed and tested according to the applicable product and project standards.

Common standards include:

• API 6D – Pipeline valves
• API 600 – Steel gate valves
• API 608 – Metal ball valves
• ASME B16.34 – Valves
• API 598 – Valve inspection and testing
• ISO 5208 – Pressure testing of metallic valves

The applicable standard should be clearly defined in the RFQ or purchase specification.

7. Define Testing and Documentation

For industrial B2B projects, buyers should also specify the required inspection and documentation, such as:

Hydrostatic testing, seat leakage testing, PMI, UT, PT, MT, VT, MTC, EN 10204 3.1/3.2 certificates and third-party inspection.

Clear requirements help prevent misunderstandings between the buyer and manufacturer.

The correct industrial valve should be selected based on function, medium, pressure, temperature, materials, sealing design, applicable standards, and inspection requirements.

Providing complete technical information in an RFQ allows the valve manufacturer to recommend the most suitable design for the application.