Pneumatic device with sealing means and method therefor

A method for preventing fluid from entering a pressurized part (16) of a brake valve (1) in an inflow direction (R2), the brake valve having at least one venting path (10), the venting path (10) including a first volume (12), through which a flow can pass, a first compressed-air passage (14) pneumatically connecting the first volume (12) to a pressurized part (16) of the brake valve (1), and a sealing mechanism (18);

• wherein the method comprises:
• providing fluid (F) above a threshold value(S) in the first volume (12) and/or in the first compressed-air passage (14) of the brake valve (1);
• bringing the sealing mechanism (18) from a normal state (Z1) into a sealing state (Z2);
• wherein in the normal state (Z2) a flow passes through the first compressed-air passage (14), which pneumatically connects the first volume (12) to the pressurized part (16) of the brake valve (1), both in the inflow direction (R2) and in an oppositely directed outflow direction (R1);
• and wherein in the sealing state (Z2) a flow passes through the first compressed-air passage (14) only in the outflow direction (R1).