Hydraulic actuator for internal combustion engine gas changeover valve

摘要

The actuator has a pin (21) moving in a cylinder (22) for opening the valve (1) with an electrically operated hydraulic valve supplied with hydraulic medium via a line with a high pressure pump (12). The medium is fed away from the pin-cylinder unit via an outlet line when the valve is subsequently closed. Both delivery (13) and outlet (15) lines contain a hydraulic valve (14a,14b). The valve in the delivery line is closed with no current and the outlet line valve is open with no current