| 1 | Pressure-Test Compliance | GB/T 13927:2018 or the latest applicable edition, with the test method matched to the valve or gate design. | Pressure-test procedure, calibrated instrument records, test pressure, holding time, medium, and signed test report. | 15% | Confirms pressure-shell integrity and seat-test discipline. |
| 2 | Quality Management System | A valid ISO 9001 certificate issued by an accredited certification body, covering the relevant manufacturing scope. | Certificate number, scope, issuing body, validity dates, and successful certificate-verification result. | 12% | Assesses repeatability of design, purchasing, production, and corrective actions. |
| 3 | Leakage Performance | Specify the applicable leakage requirement using ISO 5208, EN 12266-1, or the project specification; do not treat “zero leakage” as a universal claim. | Seat-leakage test results identifying test direction, pressure, medium, duration, and allowable leakage rate or class. | 15% | Matches sealing performance with the actual water-control application. |
| 4 | Design Service Life | Require a project-specific service-life declaration; there is no single universal service-life value for every water-control gate. | Design-life statement, operating-cycle assumptions, corrosion allowance, maintenance intervals, and replacement-part plan. | 12% | Separates evidence-based durability from unsupported marketing figures. |
| 5 | Materials and Corrosion Resistance | Materials must be suitable for water chemistry, pressure, temperature, installation environment, and applicable project requirements. | Material certificates, coating system specification, coating thickness records, elastomer grade, and corrosion-protection procedure. | 10% | Reduces corrosion, swelling, abrasion, and premature seal deterioration. |
| 6 | Dimensional and Functional Interchangeability | Dimensions, end connections, face-to-face length, operating torque, and installation interfaces must comply with the approved drawings and applicable standards. | Approved dimensional drawings, tolerance records, torque calculations, and functional inspection report. | 10% | Prevents installation conflicts and excessive actuator loading. |
| 7 | Factory Acceptance Testing | Each finished unit should be traceable to documented dimensional, pressure, leakage, coating, and operation checks. | Inspection and test plan, final inspection checklist, nonconformance records, and release certificate. | 8% | Verifies that the supplied unit matches the approved technical specification. |
| 8 | Actuator and Control Compatibility | The actuator must provide sufficient thrust or torque, travel control, position indication, and environmental protection for the duty cycle. | Actuator sizing calculation, duty-cycle data, control wiring diagram, ingress-protection rating, and manual override details. | 6% | Ensures reliable operation and integration with the site control system. |
| 9 | Traceability and Documentation | Critical components and production stages should be traceable from purchase order through final delivery. | Serial-number register, material heat numbers, inspection records, drawings, manuals, spare-parts list, and document index. | 5% | Supports commissioning, audits, maintenance, and future replacement. |
| 10 | After-Sales Service and Spare Parts | Evaluate technical support, warranty terms, spare-parts availability, commissioning assistance, and response procedures. | Warranty conditions, service-level commitment, spare-parts lead time, maintenance instructions, and escalation contacts. | 7% | Measures lifecycle support rather than purchase price alone. |