LUCAS, Nathan, J.,SWICK, William, C.,GORDON, Matthew
申请号：
USUS2014/037259
公开号：
WO2014/186201A1
申请日:
2014.05.08
申请国别(地区):
WO
年份:
2014
代理人:
摘要：
The present disclosure relates to a valve arrangement (60) for a boom control system (30) or for other control systems for work machine (10) components that may be lowered under gravity. The problem addressed is the prevention of the boom (13) or other work machine (10) component from dropping uncontrollably under a hose burst condition. The disclosure provides a valve arrangement (60) for a hydraulic system (30) for raising and lowering a component of a work machine (10). The valve arrangement (60) comprises an inlet (61) and an outlet (62). A pilot operated load control valve (63) is fluidly connected between the inlet (61) and the outlet (62), the load control valve (63) having an energised unidirectional state allowing hydraulic fluid to pass from the outlet (62) to the inlet (61) and a de-energised unidirectional state allowing hydraulic fluid to pass from the inlet (61) to the outlet (62). A pilot conduit (65) is configured to direct pilot hydraulic fluid to actuate the load control valve (63). A connecting conduit (67) fluidly connects the pilot conduit (65) to the inlet (61), the connecting conduit (67) comprising a flow restriction (68) and a check valve (69) configured to allow hydraulic fluid to flow only in a direction from the pilot conduit (65) towards the inlet (61).La présente invention concerne un agencement (60) de valve destiné à un système (30) de commande de flèche ou à dautres systèmes de commande pour composants de machine (10) de travail qui peuvent être abaissés sous leffet de la pesanteur. Le problème abordé par la présente invention est dempêcher que la flèche (13) ou quun autre composant de machine (10) de travail ne tombe de manière non contrôlée en cas déclatement dun tuyau. Linvention concerne un agencement (60) de valve destiné à un système hydraulique (30) permettant de monter et dabaisser un composant dune machine (10) de travail. Lagencement (60) de valve comprend une entrée (61) et une sortie (62). Une valve (63) de commande de ch
