Hydraulic load control valve device

E - Fixed Constructions – 02 – F

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E02F 9/22 (2006.01) F15B 13/01 (2006.01)

Patent

CA 2686808

A hydraulic load control valve (10) accommodated between a hand valve (H) and a hydraulic engine (D) has got at least one proportional load control valve (E), controlled by the pump pressure independent of the flow of hydraulic fluid to the engine. The flow to the engine (D) flows via a non-return valve (12), that is prestressed to open at a pump pressure above the upper limit before a given pressure interval, within which the load control valve (E) is adjusted between completely closed and com- pletely open position of the pump pressure.

La présente invention concerne une vanne de commande de charge hydraulique (10), installée entre une vanne à commande manuelle (H) et un moteur hydraulique (D), qui comprend au moins une vanne de commande de charge proportionnelle (E) commandée par la pression de la pompe indépendamment du flux du fluide hydraulique vers le moteur. Le flux dirigé vers le moteur (D) s'écoule par un clapet antiretour (12) qui est précontraint pour s'ouvrir lorsque la pression d'une pompe est supérieure à une limite supérieure avant un intervalle de pression donné, et dans lequel la vanne de commande de charge (E) est ajustée entre une position complètement fermée et une position complètement ouverte de la pression de la pompe.

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