Maximum working pressure difference: refers to the difference between the primary pressure and the secondary pressure allowed on the work. When the secondary pressure is 0 MPa, the figure of the highest working pressure difference is equal to the upper limit of the supply pressure. For example, the solenoid valve with the highest differential pressure of 0.4 MPa can be used when the primary side is 0.4 MPa and the secondary side is 0 MPa. Primary side: 0.5MPa, secondary side: 0MPa cannot be used. When the maximum working pressure is 0.4MPa, the working pressure should be below 0.4MPa.

Minimum working pressure difference: It is the necessary pressure difference for the main valve to work stably (the difference between the primary pressure and the secondary pressure). Such as: the highest use of pressure difference 0.6MPa, the lowest working pressure 0.02MPa solenoid valve, primary side: 0.6MPa secondary side: 0MPa available; primary side: 0.02MPa secondary side: 0MPa available; primary side: 0.3MPa secondary Side: 0.29Mpa is not available because the pressure difference is only 0.01MPa for the minimum operating pressure difference of 0.02MPa or more.