A nozzle holder, especially for an agricultural sprayer, comprising: - a body (10a, 10b, 10c) housing a liquid inlet duct configured to be supplied with liquid by a liquid supply line; - a peripheral dispensing chamber of the body (10a, 10b, 10c) supplied with liquid by the inlet duct and communicating with a plurality of liquid outlet ducts, the interfaces between the dispensing chamber and each of the liquid outlet ducts delimiting liquid through ports of the dispensing chamber, each of said outlet ducts leading to a spray head; - a plurality of valves partially arranged in the dispensing chamber, each of said valves being movable between a sealed closing position of the corresponding liquid through port of the dispensing chamber and an opening position of said through port of the dispensing chamber; - a circular plate rotationally movable relative to the body (10a, 10b, 10c) and housed in a mechanism compartment of the body (10a, 10b, 10c) having a peripheral edge in contact with a first end contact surface of each valve to control movement of said valve between the closing position and the opening position; - an actuator attached to the body to rotationally drive the plate; the nozzle holder being characterized in that the peripheral edge of the plate have high edge portions and low edge portions connected by sloping portions, such that in the opening position of a valve of the plurality of valves, the first end contact surface of said valve is in contact with a first plate edge portion among a high edge portion and a low edge portion, and in the closing position of said valve, the first end contact surface of the valve is in contact with a second plate edge among a high edge portion and a low edge portion, the second edge being different from the first edge, the rotational drive of the plate moving the contact between the first end contact surface and the peripheral edge, from the first edge to the second edge or from the second edge to the first edge passing through a sloping portion. - a body (10a, 10b, 10c) housing a liquid inlet duct configured to be supplied with liquid by a liquid supply line; - a peripheral dispensing chamber of the body (10a, 10b, 10c) supplied with liquid by the inlet duct and communicating with a plurality of liquid outlet ducts, the interfaces between the dispensing chamber and each of the liquid outlet ducts delimiting liquid through ports of the dispensing chamber, each of said outlet ducts leading to a spray head; - a plurality of valves partially arranged in the dispensing chamber, each of said valves being movable between a sealed closing position of the corresponding liquid through port of the dispensing chamber and an opening position of said through port of the dispensing chamber; - a circular plate rotationally movable relative to the body (10a, 10b, 10c) and housed in a mechanism compartment of the body (10a, 10b, 10c) having a peripheral edge in contact with a first end contact surface of each valve to control movement of said valve between the closing position and the opening position; - an actuator attached to the body to rotationally drive the plate; the nozzle holder being characterized in that the peripheral edge of the plate have high edge portions and low edge portions connected by sloping portions, such that in the opening position of a valve of the plurality of valves, the first end contact surface of said valve is in contact with a first plate edge portion among a high edge portion and a low edge portion, and in the closing position of said valve, the first end contact surface of the valve is in contact with a second plate edge among a high edge portion and a low edge portion, the second edge being different from the first edge, the rotational drive of the plate moving the contact between the first end contact surface and the peripheral edge, from the first edge to the second edge or from the second edge to the first edge passing through a sloping portion.