What safety devices should a commercial electric pressure cooker have?

Please verify the following points and require itemized written supplier responses:（commercial electric pressure cooker pressure-cooker-safety） Common devices include lid interlocks, pressure limiting valves, relief valves, overheat protection, dry-burn protection and pressure indicators, depending on the model. Inspect seals, float valves, relief paths and lid locks before use and stop using damaged units. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.