Regulatory valve of pressure with automatic unloading for circuits with accumulator La Mrqa is an automatic discharge valve for plate assembly. It is a specific valve for circuits with accumulator that optimizes the energy consumption of the pump when the accumulator has reached the pressure value expected. The Mrqa acts by downloading the entire scope of the pump in the tank upon reaching the pressure value set by the adjustment screw, until the pressure in the work line B drops to a percentage (63% or 75%, depending on the version) of the set pressure. After that, the flow from the pump to the circuit is restored by means of the incorporated non -return valve until the calibration pressure is reached. A remote reitera valve version is available (to be ordered separately). The absence of the accumulator, its incorrect pre-caric value or the incorrect calibration of the pressure value on the valve lead the valve to intervene continuously causing sudden changes of pressure in the circuit.