| 1 | Product Configuration | Confirm valve type, nominal size, pressure rating, connection standard, flow characteristic, fail position, and pneumatic actuator arrangement. | Specifications should clearly identify DN/NPS size, pressure class, body pattern, actuator type, and air-to-open or air-to-close operation. | 15% | __/5 |
| 2 | Pressure and Temperature Capability | Match the pressure-temperature envelope to the actual medium, operating pressure, design pressure, and minimum and maximum process temperatures. | Pressure-temperature ratings should be supported by applicable material tables and design requirements such as ASME B16.34 or EN 12516. | 15% | __/5 |
| 3 | Material Compatibility | Review body, trim, seat, stem, gasket, and actuator materials against corrosion, erosion, abrasion, gas composition, water content, and cleaning chemicals. | Typical material choices include carbon steel, stainless steel, alloy steel, PTFE, reinforced PTFE, PEEK, and metal seats; final selection must follow the process medium. | 12% | __/5 |
| 4 | Leakage and Shut-Off Performance | Request documented seat leakage results, test medium, test pressure, test duration, and allowable leakage class for each valve size. | Common references include IEC 60534-4, ANSI/FCI 70-2, and EN 12266-1. The required leakage class should be stated in the purchase specification. | 15% | __/5 |
| 5 | Flow Capacity and Control Accuracy | Check Cv/Kv data, required flow range, controllable turndown, cavitation risk, noise, flashing risk, and sizing calculations. | Sizing should use operating flow, differential pressure, specific gravity, viscosity, vapor pressure, and gas compressibility where applicable. | 12% | __/5 |
| 6 | Actuator and Instrumentation | Verify torque or thrust margin, supply-air pressure, air consumption, spring-return behavior, positioner compatibility, solenoid voltage, and feedback options. | Pneumatic accessories should be compatible with the buyer’s control system and environmental requirements; actuator sizing should include a documented safety factor. | 10% | __/5 |
| 7 | Quality Management and Traceability | Request quality certificates, heat-number traceability, inspection plans, calibration records, nonconformance procedures, and final inspection reports. | ISO 9001 certification is useful evidence of a quality management system, but it should not replace product-specific inspection and test documentation. | 10% | __/5 |
| 8 | Applicable Certifications and Compliance | Identify the destination-country requirements for pressure equipment, hazardous areas, emissions, materials, customs, and documentation. | Depending on the application, buyers may need evidence related to PED 2014/68/EU, ATEX 2014/34/EU, IECEx, UKCA, or other local regulations. | 8% | __/5 |
| 9 | Delivery Capability | Compare quoted lead time, production capacity, spare-parts availability, packaging method, export experience, and ability to support repeat orders. | Lead time should be confirmed in writing for the exact configuration, including engineering approval, testing, documentation, and shipping preparation. | 7% | __/5 |
| 10 | Commercial and Lifecycle Value | Evaluate purchase price together with maintenance cost, seal and seat replacement intervals, spare-part pricing, warranty terms, and technical support. | A total-cost-of-ownership comparison is more reliable than comparing the initial valve price alone. | 6% | __/5 |