BS EN 1804-3:2020 pdf free.Machines for underground mines一Safety requirements for hydraulic powered roof supports一Hydraulic and electro hydraulic control systems.
BS EN 1804-3 This document specifies the safety requirements for hydraulic and electro hydraulic control devices, including hydraulic valves and their control elements, valve combinations, control systems, pipes and hose assemblies, measuring devices, built-in pressure limiting and check valves in legs and rams and, as well emergency stop, start warning, blocking- and control unit when used as specified by the manufacturer or his authorized representative. Excluded are pressure generators, and internal valves of legs and rams (e.g. leg bottom valves, see EN 1804- 2:2020].A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020], legs and  support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020].Each part of this multipart document addresses the safety requirements of the components mentioned in the scopes of the respective parts of this multipart series.  This document is not applicable to hydraulic and electro hydraulic control systems manufactured before the date of its publication.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 853:2015, Rubber hoses and hose assemblies一Wire braid reinforced hydraulic type一Specification EN 854:2015, Rubber hoses and hose assemblies一Textile reinforced hydraulic type一Specification EN 856:2015+AC:2019, Rubber hoses and hose assemblies- Rubber-covered spiral wire reinforced hydraulic type一Specification.Hydraulic and electro hydraulic control devices shall be designed and positioned so that it is not necessary for personnel to be located in the area of the operated support units (e.g. by operating with adjacent control system according to 3.5.1) excluding operation of the rear caving door in a top coal caving application with a second conveyor behind the roof support.Hydraulic and electro hydraulic control devices shall be designed and located so that they cannot be operated unintentionally from the walkway. They shall not restrict the walkway (see EN 1804- 1:2020, 4.1.2). nformation and warning devices (e.g symbols, pressure indicators) shall be arranged so that they are clearly visible from the walkway.BS EN 1804-3 pdf download.