A band of muscles at the opening of the stomach called the Cardiac (due to its proximity to the heart) Sphincter.
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The cardiac sphincter is located at the top of the stomach and controls the direction of food passing through the esophagus so that no food will re enter the esophagus. The Pyloric sphincter stops bile and digested food from entering the stomach, this valve is located at the bottom of the stomach.
Its called the atrioventricular valve or just AV valve
the right AV valve
damber valve
tricuspid valve