Patent ID: 9279511
Filing Date: 2016-03-08
CPC Classification: B60H,F16K,Y10T

Claim Text:
1. A flapper relief valve, comprising: a flapper pivotally mounted to a housing via a connection means such that the flapper is movable between a first position and a second position, wherein a protrusion extends from a first surface of the flapper; a biasing mechanism having a non-rotatable pin and positioned near a first end of the flapper, the biasing mechanism being arranged around the connection means configured to apply a biasing force to a first surface of the flapper; the non-rotatable pin having an axis parallel to an axis of the biasing mechanism; and a drag link configured to pivot about the non-rotatable pin, the drag link including a retaining feature and being substantially aligned with the protrusion on the flapper such that when the flapper rotates to the second position the retaining feature engages the protrusion to retain the flapper in the second position.