Valve gun for a high-pressure cleaning appliance, comprising a housing and a valve which is arranged in the housing and has a closing body which in a closed position lies tight against a valve seat and is adapted to be acted upon by a valve plunger with an opening force for moving the closing body into an open position at a distance from the valve seat, and comprising a triggering lever mounted so as to be pivotable about a first pivot axis, the triggering lever being mechanically coupled to the valve plunger and manually pivotable from a rest position in which the closing body assumes its closed position to a release position in which the closing body assumes its open position, wherein the triggering lever is coupled to the valve plunger via a coupling lever mounted so as to be pivotable about a second pivot axis, the coupling lever having an actuating element via which the valve plunger is adapted to be acted upon with the opening force, and the coupling lever having a first and a second force receiving element, the first force receiving element being adapted to be acted upon first and the second force receiving element subsequently with a triggering force when the triggering lever is pivoted from the rest position to the release position, the first force receiving element being at a greater distance from the second pivot axis than the second force receiving element, wherein the triggering lever has a first and a second force application element, the first force receiving element being positionable on the first force application element, and the second force receiving element being positionable on the second force application element, wherein the first force receiving element and the first force application element form a first guide surface and a first contact element contacting the first guide surface and movable along the first guide surface, and wherein the second force receiving element and the second force application element form a second guide surface and a second contact element contacting the second guide surface and movable along the second guide surface, characterized in that the angle of inclination of the tangent of the first guide surface at the momentary contact point of the first contact element in relation to a first reference line oriented perpendicularly to a connecting line between the momentary contact point of the first contact element and the first pivot axis is smaller than the angle of inclination of the tangent of the second guide surface at the momentary contact point of the second contact element in relation to a second reference line oriented perpendicularly to a connecting line between the momentary contact point of the second contact element and the first pivot axis, wherein when the triggering lever is pivoted from the rest position to the release position, the first contact element first moves along the first guide surface, with the first contact element contacting the first guide surface, and via the first guide surface and the first contact element, a first triggering force being transferred from the triggering lever onto the coupling lever, and the second contact element subsequently moves along the second guide surface, with the second contact element contacting the second guide surface, and via the second guide surface and the second contact element, a second triggering force being transferred onto the coupling lever.