GB25974.4-2026
Powered support for coal mine—Part 4:Specification for electro-hydraulic control system
煤矿用液压支架 第4部分：电液控制系统技术条件
GB 25974.4-2026 is an upcoming mandatory Chinese national standard for Powered support for coal mine—Part 4:Specification for electro-hydraulic control system. It appears in the Machinery compliance cluster with a product safety focus and has an implementation date of Mar 1, 2027.
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
This standard applies to the design, manufacture, transportation, use, and maintenance of electro-hydraulic control systems used in powered supports for coal mines. It is mandatory for all manufacturers and operators involved in coal mine hydraulic support systems. It does not apply to purely hydraulic control systems without electro-hydraulic components, which are covered under GB/T 25974.3.
Technical requirements
The standard specifies comprehensive requirements for electro-hydraulic control systems, focusing on safety, reliability, and automation. Key areas include environmental conditions (temperature, humidity, explosive gas environments) and power supply adaptability. The system must feature critical safety functions, including emergency stop, lock-on, and action stop capabilities, with emergency stop having the highest priority. Manufacturers must ensure the system supports automatic pressure compensation and various control modes such as adjacent control, spaced control, and shearer tracking control. Furthermore, the standard outlines strict electromagnetic compatibility (EMC) requirements and explosion-proof performance criteria in accordance with KA25-2025. The system must also maintain a maximum monitoring capacity of at least 250 nodes and provide precise response times for valve operations and emergency stops.
Testing methods
The standard details rigorous testing procedures to verify compliance. This includes system function tests for data acquisition, safety stops, and automatic pressure compensation. Technical indicator tests measure response times for valve operations, remote control, and emergency stops, alongside acoustic and optical alarm verification. Engineers must also conduct continuous stability testing for 7 days and comprehensive EMC immunity tests (electrostatic discharge, radiated susceptibility, surges, etc.) based on the GB/T 17626 series. Finally, explosion-proof performance must be validated according to relevant mining safety standards.
FAQs
What products are regulated under GB 25974.4-2026?
It regulates electro-hydraulic control systems specifically designed for powered supports in coal mines, including control devices, sensors, and electro-hydraulic directional control valves.
What are the key safety functions required by this standard?
The standard mandates emergency stop, lock-on, and action stop functions. The emergency stop function must have the highest priority, immediately cutting off power and stopping all actions across the working face.
Does GB 25974.4-2026 specify EMC requirements?
Yes, it includes strict electromagnetic compatibility (EMC) requirements. The system must pass various immunity tests outlined in the GB/T 17626 series, covering electrostatic discharge, surges, and voltage dips.
The summary above provides a high-level overview of GB 25974.4-2026. To ensure complete compliance for your electro-hydraulic control systems entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 25974.4-2026 today to access all detailed parameters, testing procedures, and compliance tables.
Applicability hints
- Type
- Product
- CCS
- D97
- ICS
- 73.100
- Competent department
- National Mine Safety Administration
- Technical committee
- National Mine Safety Administration