GB5135.2-2003
Automatic sprinkler system--Part 2:Wet system alarm valves，retard chamber，water motor alarm
自动喷水灭火系统 第2部分: 湿式报警阀、延迟器、水力警铃
GB 5135.2-2003 is a current mandatory Chinese national standard for Automatic sprinkler system--Part 2:Wet system alarm valves，retard chamber，water motor alarm. It appears in the Construction compliance cluster with a product safety focus and has an implementation date of May 1, 2004.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
GB 5135.2-2003 applies to wet alarm valves, retard chambers, and water motor alarms used in automatic sprinkler systems. This standard is mandatory for manufacturers producing these fire protection components for the Chinese market. It replaces the previous GB 797-1989 standard and is not applicable to dry, deluge, or pre-action alarm valves.
Technical requirements
The standard specifies comprehensive requirements for the structural integrity and operational reliability of the valves. Key areas include material corrosion resistance, where valve bodies must be made of materials like cast iron or bronze, and specific clearance dimensions between moving parts to prevent debris blockage. Manufacturers must ensure components can withstand rigorous aging and wear conditions without functional degradation. It defines strict parameters for strength and leak resistance, requiring the valve body to endure hydrostatic pressure testing at multiples of the rated working pressure without macro-deformation or leakage. The standard also outlines hydraulic friction limits, dictating that pressure loss at a specific flow velocity must not exceed prescribed thresholds, ensuring system efficiency. For alarm functionality, the standard sets precise sensitivity thresholds, detailing the exact flow rates and inlet pressures at which the pressure switch and water motor alarm must activate or remain silent. The alarm delay time and pressure ratio during valve disc opening are strictly regulated to prevent false alarms. Additionally, the water motor alarm must meet specific sound pressure level (loudness) requirements to ensure audibility.
Testing methods
The standard mandates a series of rigorous evaluation procedures, including air and warm water aging tests for non-metallic components, and hydrostatic strength and leak tests for valve bodies. Functional tests are required to verify alarm activation thresholds, delay times, and pressure ratios under various simulated operating conditions. Furthermore, it specifies procedures for hydraulic friction measurement, water motor alarm loudness testing, and an 800°C fire resistance test for metallic and non-metallic valve bodies.
FAQs
What products are regulated under GB 5135.2-2003?
This standard regulates wet alarm valves, retard chambers, and water motor alarms used in automatic sprinkler systems. It is mandatory for all manufacturers producing these specific fire protection components for the Chinese market. GB 797-1989 was the previously replaced version.
Are there any major updates from the previous version of GB 5135.2-2003?
The updated version significantly expanded the rated working pressure grades and nominal diameter ranges for wet alarm valves. It also introduced new requirements for alarm test line devices, valve clearances, water motor alarm water resistance, and pressure switch specifications, aligning closely with ISO/WD 6182.2.
How does GB 5135.2-2003 differ from ISO standards?
The standard was primarily drafted with reference to ISO/WD 6182.2. However, it incorporates specific Chinese national compliance requirements, such as referencing GB/T 9112 for flange connections and GA 29 for pressure switches, ensuring comprehensive localization for the Chinese market.
The summary above provides a high-level overview of GB 5135.2-2003. To ensure complete compliance for your fire protection products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 5135.2-2003 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C83
- ICS
- 13.220.20
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China