Fitting with maintenance opening

A fitting for blocking off and/or regulating material streams, for use in pressure ranges above 50 bar, the fitting comprising:

• a housing body having a maintenance opening;
• a flange connection;
• a self-sealing lid closure connected to the housing body by clamping screws and a bracing ring;
• and
• a valve disk;
• wherein the flange connection serves for installation of a drive apparatus for the valve disk;
• wherein the maintenance opening is arranged spaced apart from the flange connection;
• wherein the maintenance opening is closed off in pressure-tight manner at pressure ranges above 50 bar via the self-sealing lid closure;
• wherein the self-sealing lid closure has a seal that self-seals as pressure increases;
• wherein the seal, a pressure ring, and a clamping ring are arranged between the bracing ring and the self-sealing lid closure;
• wherein the self-sealing lid closure, the clamping ring, the seal, the pressure ring, and the bracing ring have a rectangular structure;
• and
• wherein the maintenance opening has a rectangular cross-section.