Ejector having an actuation mechanism with a pilot valve and an equalization passage between two cylinder chambers

An ejector comprising

• a primary inlet;
• a secondary inlet;
• and an outlet;
• a nozzle for jetting fluid supplied at the primary inlet into a mixing portion for sucking fluid supplied at the secondary inlet into the mixing portion);
• a needle and a needle seat, wherein the needle seat is arranged downstream of the primary inlet and upstream of the nozzle;
• and
• an actuating mechanism for moving the needle between an opened position, in which the needle is lifted from the needle seat for allowing fluid flow past the needle seat, and a closed position, in which the needle abuts the needle seat and blocks fluid flow past the needle seat, wherein the actuating mechanism comprises:
• a cylinder with a piston connected to the needle, wherein a first cylinder chamber is maximized when the needle is in its opened position and a second cylinder chamber is maximized when the needle is in its closed position, wherein the first cylinder chamber is in fluid communication with the primary inlet via a chamber inlet, and wherein the second cylinder chamber is in fluid communication with the first cylinder chamber, and
• a drain passage with a pilot valve, wherein the second cylinder chamber is in fluid communication with the secondary inlet and/or the outlet via the drain passage when the pilot valve is in an open state,
• wherein the fluid communication of the second cylinder chamber with the first cylinder chamber is provided by an equalization passage, wherein a flow cross-section of the equalization passage is larger than a flow cross-section of the drain passage.