Vacuum regulating valve

A vacuum regulating valve, comprising:

• a first main port;
• a second main port;
• a passage connecting the first and the second main port;
• a cylinder actuator provided with a piston;
• a valve chamber extending between the first and the second main port;
• a valve seat placed in the passage;
• a valve element placed in the valve chamber for opening and closing the valve seat;
• a valve stem having a first end and a second end;
• the second end of the valve stem connected to the piston of the cylinder actuator;
• a spring seat placed on the valve stem;
• a return spring placed on the spring seat to push the valve element in a valve closing direction;
• a connecting mechanism connecting the first end of the valve stem and the valve element;
• a cylindrical connecting member attached to the valve element, provided with diametrically opposite radial through holes;
• a cylindrical end part formed in the first end of the valve stem, provided with a diametrical through hole aligned with the radial through holes of the cylindrical connecting member and being fitted in the cylindrical connecting member;
• a connecting pin inserted into the radial through holes of the cylindrical connecting member and the diametrical through hole of the cylindrical end part of the valve stem;
• and
• clearances formed between the cylindrical connecting member and the cylindrical end part and between side surfaces of the diametrical through holes of the cylindrical end part and the connecting pin to permit the valve element to tilt relative to the valve stem.