GB5135.7-2018
Automatic sprinkler systems—Part 7: Water flow indicators
自动喷水灭火系统 第7部分：水流指示器
GB 5135.7-2018 is a current mandatory Chinese national standard for Automatic sprinkler systems—Part 7: Water flow indicators. It appears in the Environment compliance cluster with a product safety focus and has an implementation date of Jan 1, 2019.
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 5135.7-2018 applies to vane-type water flow indicators used within automatic sprinkler systems. It covers the classification, model designation, requirements, and testing methods for these fire protection devices. This standard is mandatory for manufacturers producing water flow indicators for the Chinese market, while other types of flow indicators may refer to it for guidance.
Technical requirements
This standard specifies comprehensive technical requirements for water flow indicators, focusing on structural integrity and operational reliability. The core requirements mandate a minimum rated working pressure of 1.2 MPa and strict guidelines for various connection types, including flanged, grooved, and threaded connections. Manufacturers must ensure components like the vane and sealing assemblies meet stringent material and environmental stress criteria. The standard defines critical operational parameters such as sensitivity and delay functions. It sets specific flow rate thresholds at which the indicator must or must not trigger an alarm signal, alongside a maximum reset time. For delay-type indicators, the retard time must be adjustable within a specified range. Compliance with these sensitivity parameters is essential for accurate fire alarm signaling. Additionally, the standard outlines rigorous durability and safety requirements. This includes overload performance, water pressure resistance, and electrical safety metrics like withstand voltage and insulation resistance. The indicator must also withstand mechanical impacts, water shocks, and corrosion without compromising its functional sensitivity. These durability tests ensure long-term reliability in harsh environments.
Testing methods
The standard mandates a series of rigorous evaluation procedures to verify compliance. Key tests include the sensitivity test, which measures flow rate thresholds and reset times, and the working cycle test, which evaluates operational longevity. Manufacturers must also conduct environmental and endurance tests, such as the warm water aging test for sealing components and the blade bending test for mechanical durability. Additionally, electrical safety is verified through withstand voltage and insulation resistance tests, while structural integrity is assessed via water shock and external impact tests.
FAQs
What products are regulated under GB 5135.7-2018?
This standard applies specifically to vane-type water flow indicators used in automatic sprinkler systems. Other types of water flow indicators may refer to this standard for guidance, but they are not the primary regulatory focus.
Are there any updates from the previous version of GB 5135.7?
The 2018 version introduces new requirements for classification, model designation, connection methods, vane specifications, sealing components, and signal output parts. It also adds reset time requirements for sensitivity and specific mechanical strength criteria for saddle-type indicators.
How does GB 5135.7-2018 relate to international standards?
The standard references several Chinese national standards for connections and testing, such as GB/T 7306 for threads and GB 5135.11 for grooved couplings. Manufacturers must ensure their products meet these specific Chinese dimensional and testing protocols rather than solely relying on ISO equivalents.
The summary above provides a high-level overview of GB 5135.7-2018. To ensure complete compliance for your 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 5135.7-2018 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- C84
- ICS
- 13.220.10
- Competent department
- National Fire and Rescue Administration
- Technical committee
- National Technical Committee on Fire Protection of Standardization Administration of China
Relationships
Replaces:GB 5135.7-2003