Patent ID: 8091583
Filing Date: 2012-01-10
Classification: F02M,F16K,Y10T

Abstract:
1. A valve, comprising: a housing formed with a downstream port and an upstream port; an axially displaceable plunger biased into sealing engagement of a major flow path extending between said downstream port and said upstream port for admitting flow only in an upstream direction; said plunger comprising a tubular portion sealed at a lower end thereof by an end portion, the plunger being formed with a normally closed flow path of a minor check valve for admitting flow only in a downstream direction, and a laterally projecting annular portion; the minor check valve having one or more axial apertures formed in the end portion of the plunger, and a deformable resilient sealing member forming a normally flat-shaped cover layer fitted on the plunger and configured to normally seal the one or more axial apertures; the laterally projecting annular portion of the plunger bearing against a support shoulder of the housing with a portion of the deformable resilient sealing member extending therebetween to ensure tight sealing therebetween; the end portion having a central extension axially projecting in a direction away from the tubular portion, the central extension extending through an opening formed in the deformable resilient sealing member; wherein when the minor check valve is sealed, a peripheral end of the sealing member bears against the end portion, and an inner end of the sealing member bears against the central extension, thereby sealing the apertures, and wherein when the minor check valve is opened, a peripheral end of the sealing member bears against the end portion, and an inner end of the sealing member is deformed away from the central extension, thereby forming fluid communication from the upstream port towards the downstream port through the apertures and in between the deformed sealing member and the central extension.