Patent ID: 11970257
Assignee: HAWE HYDRAULIK SE
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 11:
12. A hydraulic power trim lift device for a marine propulsion system, comprising:
at least one lift cylinder having a lift piston chamber and a lift rod chamber separated from the lift piston chamber by a lift cylinder piston;
at least one pump connected to the lift rod chamber via a first line arrangement and connected to the lift piston chamber via a second line arrangement; and
a tank;
wherein:
the lift piston chamber is connected to the tank via the second line arrangement when the first line arrangement is pressurized;
the second line arrangement comprises a flow control device acting in a direction of flow to the tank;
the pump is a reversible pump;
the first line arrangement has a first spring-loaded and hydraulically openable check valve; and
the second line arrangement has a second spring-loaded and hydraulically openable check valve;
further comprising a selector valve selectively connecting the first line arrangement and the second line arrangement to the tank.