Device and method for adjusting a flow rate of an injection valve

The invention relates to a device for adjusting a flow rate of an injection valve (1) with a receptacle (10) for receiving and holding the injection valve (1) to be adjusted, an adjusting element (4) for adjusting an adjustment mechanism of the injection valve for adjusting the flow rate, a fluid reservoir for a test fluid, a pump (8) for generating a pressure of the test fluid in the fluid reservoir, and a measuring device (11) for determining the pressure in the fluid reservoir. A compensating piston (5) coupled to the adjusting element (4) is provided, by means of which a change in volume of the fluid reservoir caused by a movement of the adjusting element (4) can be compensated. The invention further relates to a method for adjusting a flow rate of an injection valve.