GB 5135.4-2025 Automatic sprinkler system—Part4: Dry pipe valves and accelerator 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 5135.4-2025
Replaces GB 5135.4-2003
Automatic sprinkler system - Part4: Dry pipe valves and accelerator
自动喷水灭火系统 第4部分：干式报警阀、加速器
Issue date: 2025-10-31 Implementation date: 2026-11-01
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
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Designation
5 Model Designation
5.1 Model Designation for Dry Pipe Valves
5.2 Model Designation for Accelerators
6 Requirements
6.1 Appearance and Marking
6.2 Specifications
6.3 Rated Working Pressure
6.4 Corrosion Resistance of Materials
6.5 Structure, Clearance, and Drainage
6.6 Connection Methods
6.7 Rigid Non-metallic Parts
6.8 Valve Disc Seals
6.9 Operating Cycle
6.10 Strength
6.11 Leakage and Deformation
6.12 Hydraulic Friction
6.13 Function
6.14 Anti-reset
6.15 Impact Resistance
6.16 Accelerator Balance Time
6.17 Fire Resistance Requirements
7 Test Methods
8 Inspection Rules
8.1 Inspection Categories
8.2 Inspection Procedures
8.3 Inspection Result Judgment
9 Marking and Instruction Manual
9.1 Marking
9.2 Instruction Manual
10 Packaging, Transportation, and Storage
10.1 Packaging
10.2 Transportation
10.3 Storage
1 Scope
This document defines the terms and definitions for dry pipe valves and accelerators in automatic sprinkler systems, and specifies the classification, model designation, requirements, inspection rules, marking, instruction manuals, and packaging, transport, and storage requirements for dry pipe valves and accelerators. It also describes the corresponding test methods.
This document applies to the design, manufacture, and inspection of dry pipe valves and accelerators in automatic sprinkler systems.
2 Normative References
The contents of the following documents, through normative reference 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 DefinitionsThe following terms and definitions apply to this document.
3.1 Dry pipe valve
A one-way control valve for automatic fire sprinkler systems, filled with gas at a predetermined pressure on the system side, which allows water to flow into the system and initiates an alarm when the system-side gas pressure falls below a specified value.
3.2 Differential-type dry pipe valve
A dry pipe valve (3.1) with a predetermined gas pressure on the system side, where the gas acts directly or indirectly on the sealing assembly to keep the valve in the closed position.
3.3 Mechanical-type dry pipe valveA dry pipe valve (3.1) with a predetermined gas pressure on the system side, where the gas does not act on the sealing assembly, but is kept in the closed position by a mechanical amplification mechanism.
3.4 Ready condition
The state of the alarm valve when it is installed in the system: the system side is filled with gas at a predetermined pressure, the supply side is filled with stable water pressure, and no water flow passes through.
3.5 Anti-reset latch
A latching mechanism that prevents the sealing assembly of the dry pipe valve (3.1) from returning to its set position after activation.
3.6 Automatic drain valve
A valve that automatically drains water from the intermediate chamber and vents it to the atmosphere when the dry pipe valve (3.1) is in the ready condition, and automatically closes after the dry pipe valve operates.
3.7 Leak point
The moment during the opening process of a dry pipe valve (3.1), under a certain supply water pressure, when water starts to discharge from the intermediate chamber or the automatic drain valve (3.6) from the system side. The system-side air pressure measured at this moment is the leak point pressure.
3.8 Trip point
The moment during the opening process of a dry pipe valve (3.1), under a certain supply water pressure, when water begins to flow to the system side. The system-side air pressure measured at this moment is the trip point pressure.
3.9 Differential
Under a certain supply water pressure, the ratio of the supply water pressure to the system-side air pressure when the dry pipe valve (3.1) is at the trip point.
3.10 Intermediate chamber
The space within a dry pipe valve (3.1) that separates the air seal and the water seal. Note: When the dry pipe valve (3.1) is in the ready condition, the pressure in this space is atmospheric pressure. 3.11 Priming waterThe water used to seal the air-closed components and prevent the adhesion of moving parts.
3.12 Service pressure
The static water pressure at the inlet of the valve when the dry pipe valve (3.1) is in the ready condition.
3.13 System pressure
The static water pressure at the outlet of the valve when the dry pipe valve (3.1) is in the ready condition.
3.14 System air pressure
The static air pressure in the outlet pipeline of the valve when the dry pipe valve (3.1) is in the ready condition.
3.15 Rated working pressure
The maximum working pressure permitted for the dry pipe valve (3.1) or accelerantor in the ready condition or operating state.
3.16 Accelerator
A quick-opening device using a mechanical means to reduce the opening time of the dry pipe valve (3.1).
3.17 Accelerator booster chamber
The part in an accelerantor that guides the piston/expansion device, increases air flow velocity, and generates required pressure.
3.18 Supply air pressure
The minimum static air pressure required for the accelerantor to operate reliably under specified conditions.
3.19 Supply valve
A small solenoid valve (or air pilot valve) in an accelerantor that controls air flow to achieve the predetermined quick-opening function.
4 Classification and Designation
4.1 Classification by structural form:a) Mechanical-type dry pipe valve, designation "J"; b) Differential-type dry pipe valve, no designation.
4.2 Classification by connection form:a) Threaded connection, designation "L"; b) Grooved connection, designation "G"; c) Flanged connection, no designation.
4.3 Classification by accelerantor installation:a) Dry pipe valve installed with accelerantor, designation "A"; b) Dry pipe valve not installed with accelerantor, no designation.
5 Model Designation
5.1 Model designations for dry pipe valvesThe model designations for dry pipe valves shall conform to the following rules. Example: ZSFCJ 100-1.2-G-A indicates a mechanical-type dry pipe valve installed with an accelerantor, with grooved connection, rated working pressure of 1.2 MPa, nominal diameter of 100 mm.
5.2 Model designations for accelerantorsThe model designation for an accelerantor shall consist of its name designation and inlet connection diameter. Example: A-25 indicates an accelerantor with an inlet connection size of 25 mm.
6 Requirements
6.1 Appearances and Marking
