The nozzle and pump are completely independent devices. They don't adjust their flow rates just because the other part exists. They don't 'care' nor do they 'know' that the other part is there. The flow through the nozzle depends only on what pressure it has on the inlet. If there's 40 psi on the inlet, it will flow 0.5 L/min, no more, no less. It doesn't matter if there's a pump upstream or a reservoir of water. All the nozzle cares about is what the pressure is. If the pressure increases to 60 psi, the flow will increase to 0.7 L/min. Again, it doesn't matter if there's a pump upstream, or an enormous dam with an infinite amount of water. It will flow 0.7 L/min when 60 psi is at the inlet.
The pump doesn't know what the nozzle is doing either. The pump doesn't care. If you turn it on, it produces some amount of flow. If this is a diaphragm machine, the flow rate won't change much when you change the pressure. So if you try to pump into a sealed volume, the pump will try to put 2 L/min into that volume regardless of what pressure it is. But if there's no place for the water to go, the pressure will rapidly rise. Almost instantly in fact. As pressure rises, the diaphragm in the pump has to push harder so the motor has to work harder. But the motor can only produce so much torque. As pressure goes up, the motor will stop because it won't be able to turn the crankshaft with so much force on the piston.
That's what's going to happen when you try to use this pump to pump water or other liquid through this nozzle is that the nozzle will only produce some relatively small amount of flow compared to the flow of the pump and pressure will rapidly increase. When pressure gets to some point, the motor will stop and your electrical current will increase dramatically. It will probably blow a circuit breaker at that point or just burn the motor out.