GB 5135.2-2025 Automatic sprinkler system—Part 2: Wet system alarm valves; retard chamber and water motor alarm English, Anglais, Englisch, Inglés, えいご
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ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB 5135.2-2025
Replaces GB 5135.2-2003
Automatic sprinkler system - Part 2: Wet system alarm valves, retard chamber and 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
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Model Designation
5 Requirements
5.1 General Requirements
5.2 Technical Requirements
6 Test Methods
6.1 Sampling and Temperature Treatment
6.2 Freezing Point
6.3 Freeze-Thaw Stability
6.4 Viscosity
6.5 pH Value
6.6 Corrosion Rate
6.7 Surface Tension
6.8 Wetting Ability
6.9 Expansion Ratio and 25% Drainage Time
6.10 Thermal Protection Performance
6.11 Class A Fire Extinguishing Performance
7 Inspection Rules
8 Marking, Packaging, Transportation and Storage
Appendix A (Normative) Standard Compressed Air Foam System Operation Method
1 Scope
This document defines the terms and definitions of wet system alarm valves, retard chambers, and water motor alarms in automatic sprinkler systems. It specifies the classification, model designation, requirements, inspection rules, marking, instruction manuals, packaging, transportation, and storage for wet system alarm valves, retard chambers, and water motor alarms, and describes the corresponding test methods.
This document applies to the design, manufacture, and inspection of wet system alarm valves, retard chambers, and water motor alarms in automatic sprinkler systems.
2 Normative References
The contents of the following documents, through normative references in this text, constitute essential provisions of this document. For dated references, only the edition cited applies; for undated references, the latest version (including all amendments) applies.
GB 5135.11 Automatic sprinkler systems—Part 11: Grooved pipe fittings
GB/T 7306 (all parts) 55° sealing pipe threads
GB/T 9124.1 Steel pipe flanges—Part 1: PN series
GB/T 9124.2 Steel pipe flanges—Part 2: Class series
GB/T 9969 General principles for instruction manuals of industrial products
GB/T 17241.1 Cast iron pipe flanges—Part 1: PN series
GB/T 17241.2 Cast iron pipe flanges—Part 2: Class series
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Wet system alarm valve
A one-way valve that allows water to flow into a wet fire protection system and drives the associated alarm components at specified pressure and flow rates.
3.2 Sealing assembly
The main movable sealing component in a wet system alarm valve that prevents backflow of water.
3.3 Compensator
An auxiliary component that minimizes false actuation of the wet system alarm valve due to water source pressure fluctuations or surges.
3.4 Retard chamber
A volumetric device that minimizes false alarms caused by water source pressure fluctuations or surges.
3.5 Water motor alarm
A hydraulically driven alarm device that produces audible signals.
3.6 Ready condition
The state where the wet system alarm valve is installed in the piping system, supplied with stable water pressure from the water source, and no water flows from any outlet on the system side.
3.7 Rated working pressure
The maximum working pressure allowed for the wet system alarm valve, retard chamber, and water motor alarm in the ready condition (3.6) or operating state.
3.8 Service pressure
The static water pressure at the inlet of the valve when the wet system alarm valve is in the ready condition (3.6).
3.9 System pressure
The static water pressure at the outlet of the valve when the wet system alarm valve is in the ready condition (3.6).
3.10 Retard time
The time difference between the wet system alarm valve with and without a retard chamber, from the moment water is released from the system side until the alarm device emits a continuous alarm.
4 Classification and Designation
4.1 Classification by structural form:
a) Butterfly-type wet system alarm valve, designated as "D";
b) Flap-type wet system alarm valve, no designation.
4.2 Classification by connection form:
a) Grooved connection, designated as "G";
b) Threaded connection, designated as "L";
c) Flanged connection, no designation.
5 Model Designation
5.1 Model designation for wet system alarm valves
The model designation for wet system alarm valves shall comply with the following rules:
Example: ZSFZD 100-1.2-G indicates a butterfly-type wet system alarm valve with a grooved connection, a rated working pressure of 1.2 MPa, and a nominal diameter of 100 mm.
5.2 Model designation for retard chambers and water motor alarms
The model designation for retard chambers and water motor alarms shall comply with the provisions of Appendix A.
6 Requirements
6.1 Appearance and Marking
6.1.1 Appearance
Wet system alarm valves, retard chambers, and water motor alarms shall have a smooth surface, no processing defects or impact damage, uniform coating, and complete markings.
6.1.2 Marking
Wet system alarm valves shall be clearly marked, and the following information shall be permanently and legibly indicated in a prominent position:
a) Product name and model;
b) Name or trademark of the manufacturer;
c) Rated working pressure;
d) Applicable standard;
e) Date of manufacture and product serial number;
f) Water flow direction for installation.
6.2 Specifications
The nominal diameters of the inlet and outlet of wet system alarm valves shall be 50 mm, 65 mm, 80 mm, 100 mm, 125 mm, 150 mm, 200 mm, and 250 mm.
6.3 Rated working pressure
