CHECK VALVE, INJECTION ASSEMBLY, AND BEVERAGE PREPARATION MACHINE

摘要

The present invention is directed to a check valve 10, an injection assembly 60, and a beverage preparation machine 100, which is integrated in the injection assembly 60. The check valve 10 of the present invention is made of a body with a first fluid outlet 21, and a plug member 30 that is movable inside the body 20. The plug member 30 has a fluid inlet 32 and a second fluid outlet 31 into a first cavity 11, wherein the fluid can exercise a pressure on a first surface 381 of the plug member 30 opposing the first fluid outlet 21. The fluid pressure can overcome the force of an elastic element 40, which biases the plug member 30 into a closed position. If the force of the elastic member 40 is overcome, the plug member 30 is moved into an open position. In the closed position a fluid path from the cavity 11 out of the first fluid outlet 21 is closed, whereas in the open position said fluid path is open. To move the plug member 30 from its initial closed position to its open position, a fluid pressure on the first surface has to be equal to or larger than a predetermined threshold.

主权项

1. Check valve comprising:
a body defining a cylindrical chamber presenting an upper wall and a lower wall, wherein: the upper wall comprises a central opening and the lower wall presents a shoulder around a bore, the end of the bore comprising a central opening and forming the seat of the check valve, a plug member housed inside the body chamber, the plug member comprising: a tube with a bore, the tube extending through the body chamber upper wall central opening, a cylindrical sealing element around the tube, the cylindrical sealing element dividing the body chamber in an upper cavity and lower cavity and sealing the cavities one from the other, the lower surface of the cylindrical sealing element facing the lower cavity presents a shoulder around a protruding part, the protruding part being configured to fit inside the bore of the body chamber lower wall to act as the valve member of the check valve, the bore inside the plug member tube extends through the plug member and emerges in the lower cavity of the body chamber, and an elastic element housed in the body upper cavity in order to press the plug member protruding part against the valve seat.