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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...

BS EN 1804-2:2020 pdf free.Machines for underground mines - Safety requirements for hydraulic powered roof supports. BS EN 1804-2 This document stipulates the safety requirements for use of legs and rams as intended by the manufacturer. These include legs, support rams and rams, including the mechanical extensions, the inner valves and safety devices, seals, the hydraulic connections (up to the...