Valve device for pressure control in a combustion engine, and a method for such pressure control

An engine arrangement comprising:

• an engine with a crankcase (11) and a connection for ventilating crankcase gases from the crankcase (11) to a suction pipe (9) via a connection (35) which can be opened;
• a valve device (15) configured to detect the current pressure in said crankcase (11) and for opening and closing, respectively, a connection (35) between said crankcase (11) and a suction pipe (9) of the engine depending on said detected pressure;
• and
• said valve device (15) comprising:
• a first valve (19) that assumes a configuration between a first, opened position and a second, closed position depending on detected pressure in the crankcase (11), and a second valve (20) that assumes a condition between a first, opened position and a second, closed position depending on the condition of said first valve (19), and said second valve (20) opens said connection (35) when the first valve (19) assumes a closed position, and said second valve (20) closes said connection (35) when the first valve (19) assumes an opened position.

A method for pressure control in a combustion engine (1), said method comprising:

• feeding crankcase gases during operation of the engine from a crankcase (11) forming part of the engine;
• detecting the current pressure in said crankcase (11) and opening and closing a connection (35) between the crankcase (11) and a suction pipe (9) of the engine depending on the detected pressure;
• controlling a first valve (19) between a first, opened position and a second, closed position depending on said detected pressure in the crankcase (11);
• controlling a second valve (20) between a first, opened position and a second, closed position depending on the condition of said first valve (19);
• and
• opening said connection (35) when the first valve (19) assumes a closed position and closing said connection (35) when the first valve (19) assumes an opened position.