Methods and apparatus for disseminating over the Internet product information produced and maintained by product manufacturers using existing universal product codes as access keys. The animal experiments demonstrated that this kind of chemicals shows remarkable physiological activities, which may be helpful in ameliorating mental impediment in adults and promoting the intelligence development in adolescent, even can be a clinical medicine for the patient of Alzheimer’s disease. Upon closing the adjustment element performs an additional overtravel corresponding to the idle stroke, when the valve body already rests with both its valve disks on the respective valve seats.