초록 ▼

The invention provides an unbalanced, butterfly check valve including a hollow main body member having a frusto-conical valve seat disposed interiorly therein, and a valve closure member in the form of a generally circular plate having a frusto-conical periphery conforming to the valve seat; the val

The invention provides an unbalanced, butterfly check valve including a hollow main body member having a frusto-conical valve seat disposed interiorly therein, and a valve closure member in the form of a generally circular plate having a frusto-conical periphery conforming to the valve seat; the valve closure member is disposed for pivotal movement about an axis normal to the axis of the main body member and laterally offset from the center thereof. The center of gravity of the valve closure member biases the same to the closed position and is located such that the torque required to open the valve decreases as the closure member moves from its closed position to its open position. The closure member may be also fluid-dynamically profiled so as to remain open in response to a minimum flow condition and to rapidly become closed upon the occurrence in a change in flow direction.

대표청구항 ▼

A valve assembly comprising: a hollow, main body member disposed on a generally horizontal axis; a frusto-conical valve seat disposed interiorly of said main body member; and a circular closure member having a frusto-conical periphery conforming to said frusto-conical valve seat, said closure member

A valve assembly comprising: a hollow, main body member disposed on a generally horizontal axis; a frusto-conical valve seat disposed interiorly of said main body member; and a circular closure member having a frusto-conical periphery conforming to said frusto-conical valve seat, said closure member being journalized in said main body member for rotation about a horizontal axis normal to the direction of the axis of said valve seat, said axis of rotation being displaced from a diameter of said closure member a distance less than the radius of said member, said closure member having a weight distribution such that the center of gravity thereof remains on one side of a vertical plane including said axis of rotation throughout the entire range of movement of said member and acts through a progressively decreasing moment arm as said member rotates toward a horizontal open position so as to develop a correspondingly decreasing closing, biasing torque.