Diaphragm seal and pressure measuring device having such a diaphragm seal

A diaphragm seal for hydraulic forwarding of a pressure, the diaphragm seal comprising:

• a metallic diaphragm seal body;
• a dividing diaphragm including a first side and a second side facing away from the first side, wherein the first side of the dividing diaphragm configured to be loaded with the pressure to be forwarded;
• a chamber, which is closed on a side by the dividing diaphragm, wherein the second side of the dividing diaphragm faces the chamber as to load the chamber with the pressure to be forwarded;
• a hydraulic channel in communication with the chamber as to transmit the pressure prevailing in the chamber, wherein the hydraulic channel and the chamber are filled with a transmission fluid, and wherein the hydraulic channel extends, at least in a section, through the diaphragm seal body;
• a filling channel in the diaphragm seal body, the filling channel in communication with the hydraulic channel;
• and
• a closure body configured to close the filling channel, wherein the closure body is disposed in the filling channel with a locating fit and is welded to the diaphragm seal body,
• wherein the diaphragm seal body comprises a first material with a first degree of hardness, and the closure body comprises a second material with a second degree of hardness, which differs from the first degree of hardness by at least 10% of the lower one of the first and second degree of hardness.