Patent ID: 9593780
Date: 2017-03-14
CPC Classifications: F16K,H01M,Y02E,Y10T

Claim:
1. A forward check valve comprising: a valve housing; a diaphragm defining a valve chamber in the valve housing, the diaphragm being displaced by pressure of a fluid in the valve chamber; and a valve portion arranged to block or allow the fluid to flow into the valve chamber due to displacement of the diaphragm; wherein the valve housing includes an inflow hole, an outflow hole, an opening, and a valve seat arranged such that the fluid flows into the valve chamber via the inflow hole, the outflow hole is connected to a pump and the fluid flows out from the valve chamber via the outflow hole by suction pressure of the fluid generated by the pump, the opening is connected to the inflow hole and accommodating the valve portion as a result of fitting the valve portion to the opening, and the valve seat is positioned around a periphery of the inflow hole; the valve portion includes a valve body, a supporting portion, and an annular fixation portion arranged such that the valve body contacts the valve seat when the valve portion is accommodated in the opening, the supporting portion supports the valve body so that the valve body is movable in directions in which the valve body moves towards and away from the valve seat, and the annular fixation portion contacts a peripheral surface defining the opening of the valve housing to fix the supporting portion when the valve portion is accommodated in the opening; and the fixation portion includes a plurality of protruding portions that protrude from an opening-side surface of the valve housing when the valve portion is accommodated in the opening.