Patent ID: 9097356
Filing Date: 2015-08-04
Classification: B60K,F02M,F16K,Y10T

Abstract:
1. A check valve capable of being mounted on a fuel tank, the check valve comprising: a casing including: a positive pressure valve seat formed in the valve chamber at a side of the first end; a positive pressure valve slidably disposed in the valve chamber, the positive pressure valve including: a positive pressure valve spring disposed in the casing to urge the positive pressure valve so as to be brought into contact with the positive pressure valve seat; a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat of the positive pressure valve; and a negative pressure valve spring disposed in the positive pressure valve to urge the negative pressure valve so as to be brought into contact with the negative pressure valve seat, wherein the positive pressure valve spring is disposed between an inner circumference of the casing and an outer circumference of the outer cylinder, such that one end of the positive pressure valve spring is supported by the casing while the other end of the positive pressure valve spring is supported by the outer cylinder, wherein the negative pressure valve spring is disposed in the inner cylinder, and wherein the negative pressure valve seat is defined on an outer surface of the inner cylinder of the positive pressure valve.