Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: EN 1804-3:2006 /A1:2010
• Năm ban hành / Publication date: 2010
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 3: Hydraulic control systems
• Phạm vi áp dụng / Scope of standard: This document specifies the safety requirements for hydraulic control devices, including hydraulic valves and their control elements, valve combinations, control systems, pipes and hose assemblies, fittings, shut-off devices, measuring devices, filters, built-in pressure limiting and check valves in legs and rams and water spraying and dust suppression valves when used as specified by the manufacturer or his authorized representative. Excluded are electronic control devices, pressure generators, and internal valves of legs and rams (e.g. constant yield valves, see EN1804-2).