| Valve Material | Unplasticized polyvinyl chloride (UPVC/PVC-U) body and components suitable for the intended service. | Material grade clearly identified, with traceable raw-material documentation and suitability for potable water, irrigation, chemical, or industrial applications. | Material quality affects chemical resistance, pressure performance, service life, and regulatory acceptance. | Material datasheet, technical declaration, batch traceability, and application-specific compatibility chart. |
| Nominal Size Range | Common plastic ball valves are available in small and medium pipe sizes, depending on the connection system. | Confirm availability in the required DN/NPS range, including consistent dimensions across the complete product series. | A complete size range simplifies sourcing, installation, and spare-parts management. | Dimensional catalogue, product drawings, and size-by-size availability list. |
| Pressure Rating | Pressure capability varies by size, temperature, valve design, and applicable standard. | Compare pressure ratings at the actual operating temperature rather than relying only on a maximum rating at room temperature. | UPVC pressure resistance decreases as temperature increases; incorrect selection can cause leakage or failure. | Pressure-temperature curve, design pressure, test pressure, and operating limitations. |
| Connection Type | Solvent-socket, threaded, flanged, or union-end configurations are commonly used. | Select connection dimensions that match the project piping standard, such as ISO, DIN, ASTM, or NPT requirements. | Incompatible dimensions can lead to installation delays, adapters, or joint failures. | Connection standards, detailed drawings, thread specifications, and compatibility declarations. |
| Seal and O-Ring Materials | Common elastomers include EPDM, FKM, and NBR, selected according to the medium and temperature. | Require the seal material to be specified for each model and verified against the conveyed fluid. | The seal often determines chemical compatibility and leakage resistance. | Bill of materials, elastomer specifications, temperature range, and chemical-resistance information. |
| Operating Temperature | UPVC is generally intended for moderate-temperature service and should not be treated as a high-temperature material. | Verify the continuous and peak temperature limits for the complete valve assembly, including seals and fittings. | Temperature affects pressure capacity, dimensional stability, and seal performance. | Temperature rating, derating chart, and installation limitations. |
| Chemical Compatibility | UPVC provides useful resistance to many acids, alkalis, salts, and water-treatment chemicals, but not to every chemical. | Evaluate the valve against chemical concentration, temperature, exposure time, and seal material before approval. | A generally corrosion-resistant material may still be unsuitable for a specific chemical service. | Chemical compatibility chart, application references, and written technical recommendation. |
| Valve Design | Two-piece and three-piece designs are common; union-end designs can simplify maintenance. | Compare body construction, serviceability, flow passage, handle design, and availability of replacement seals. | Design influences maintenance time, pressure loss, installation flexibility, and total ownership cost. | Exploded view, spare-parts list, maintenance instructions, and sectional drawings. |
| Flow Characteristics | A full-bore or reduced-bore ball passage may be used depending on the valve design. | Compare internal passage diameter, pressure drop, and flow coefficient where system efficiency is important. | Flow geometry affects pumping energy, velocity, and system capacity. | Flow coefficient data, pressure-loss curves, and internal-diameter drawings. |
| Leak-Tightness Performance | Ball valves are designed for tight shutoff when correctly manufactured, assembled, and operated. | Require documented shell and seat leakage testing for production batches. | Reliable shutoff reduces fluid loss, contamination risk, and maintenance requirements. | Factory test procedure, acceptance criteria, inspection records, and sample test reports. |
| Applicable Standards | Relevant requirements may cover valve dimensions, plastic piping systems, pressure testing, potable-water contact, or threaded connections. | Match the product documentation to the destination market and project specification instead of accepting general compliance claims. | Standards determine testing, dimensions, materials, marking, and acceptance criteria. | Exact standard numbers, declarations of conformity, certificates, and test reports issued by competent bodies. |
| Potable-Water Suitability | Products for drinking-water systems may require specific material and migration approvals. | Confirm approval for the exact valve model, material formulation, seals, and target country or region. | Industrial or irrigation suitability does not automatically qualify a product for drinking-water use. | Valid potable-water certificate, scope of approval, testing laboratory details, and expiry information. |
| Quality-Control System | Manufacturers may operate quality systems covering incoming materials, moulding, assembly, testing, and final inspection. | Prioritize documented process controls, calibrated inspection equipment, nonconformance handling, and batch traceability. | Consistent process control is more meaningful than appearance or a single sample inspection. | Quality manual, inspection plan, calibration records, audit reports, and batch-release procedure. |
| Product Marking and Traceability | Valve bodies commonly identify size, material, pressure class, flow direction where applicable, and production information. | Require permanent or durable marking that links the product to a model, batch, and technical documentation. | Traceability supports installation verification, recalls, warranty claims, and compliance audits. | Marking samples, coding system, label artwork, and traceability procedure. |
| Customization Capability | Possible options include connection type, seal material, actuator interface, handle color, packaging, and documentation language. | Assess whether modifications are supported without compromising standardization, testing, or regulatory status. | Customization can improve project fit but may increase tooling, validation, and lead-time requirements. | Engineering-change process, minimum order quantity, tooling terms, prototype policy, and revised drawings. |
| Production and Supply Capacity | Capacity depends on moulding equipment, assembly lines, testing resources, and supply-chain stability. | Evaluate realistic monthly capacity, confirmed lead time, peak-season planning, and continuity of critical raw materials. | A competitive unit price is not useful if deliveries are inconsistent or incomplete. | Capacity statement, production schedule, lead-time commitment, and business-continuity plan. |
| Packaging and Export Readiness | Valves should be protected from impact, contamination, moisture, and deformation during storage and transport. | Confirm export packaging, carton markings, pallet configuration, loading method, and documentation for the destination country. | Proper packaging reduces transit damage and customs or warehouse handling problems. | Packaging specification, packing photos, carton dimensions, shipping marks, and export-document checklist. |
| Warranty and Technical Support | Support commonly covers installation guidance, product defects, replacement parts, and complaint handling. | Compare warranty duration, exclusions, response time, spare-parts availability, and multilingual technical support. | Responsive support lowers downtime and improves the long-term value of the purchase. | Written warranty terms, service-level commitment, spare-parts policy, and escalation procedure. |
| Total Cost of Ownership | Purchase price is only one component; freight, installation, maintenance, replacement, and failure costs also apply. | Compare landed cost, expected service life, maintenance requirements, spare-parts cost, and delivery reliability. | The lowest quotation may not provide the lowest lifecycle cost. | Itemized quotation, freight assumptions, replacement-part pricing, warranty coverage, and lifecycle-service information. |
