EP 0388498 B1 19930317 - HYDRAULIC VALVE SYSTEM FOR A PILE DRIVER HAMMER
Title (en)
HYDRAULIC VALVE SYSTEM FOR A PILE DRIVER HAMMER
Publication
Application
Priority
EP 89105202 A 19890323
Abstract (en)
[origin: EP0388498A1] The invention relates to a hydraulic valve system, in particular for activating a piston-cylinder unit (3, 4) for free-fall hammers, having an activating valve (27) which operates a hydraulic pilot valve which actuates the main valve, the pilot valve and the main valve having a common axially displaceable control spool (16), the control spool (16) being arranged in a control housing (31) and being designed as a sleeve, the inside of which is provided with functional areas of the pilot valve, and functional areas of the main valve are arranged on its outer surface. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
B25D 9/145 (2013.01); E02D 7/10 (2013.01)
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
EP 0388498 A1 19900926; EP 0388498 B1 19930317; DE 58903827 D1 19930422
DOCDB simple family (application)
EP 89105202 A 19890323; DE 58903827 T 19890323