Methods for controlling or regulating the volume flow rate of a substance to be sprayed and/or a gas from a nozzle suitable for spraying substances, particularly dispersions, emulsions or suspensions, wherein the nozzle has a nozzle body comprising a nozzle mouthpiece, wherein the nozzle body has an inner pipe, which is connected to a supply for the substance to be sprayed and has an inner wall and a discharge port, and an outer pipe, which is spaced from the inner pipe, is connected to a supply for a gas and has a discharge port, and the discharge port of the inner pipe and the discharge port of the outer pipe are arranged in the region of the nozzle mouthpiece.

A nozzle arrangement for use in expelling pressurized fluid includes a dead man control. The dead man control has a manually operable control part movable between a non-operating position, which prevents operation of the nozzle arrangement, and an operating position, and biased towards the non-operating position. The manually operable control part is pivotably coupled relative to a nozzle holder of the nozzle arrangement, which extends away from the pivotal coupling substantially towards a distal end of a nozzle part of the nozzle arrangement. The manually operable control part includes a handle part which in the operating position is substantially against and aligned with the nozzle part.