초록 ▼

A butterfly valve adapted for controlled variation in the area of the leading wing of the valve plate. The valve plate is comprised of two parallel plate-like members which are relatively translatable in mutually parallel directions. The relative translational movement further covers or uncovers an

A butterfly valve adapted for controlled variation in the area of the leading wing of the valve plate. The valve plate is comprised of two parallel plate-like members which are relatively translatable in mutually parallel directions. The relative translational movement further covers or uncovers an open area formed through one of the two members on the leading wing thereof. Movement of the valve plate occurs as either rotational movement of the entire valve plate or relative translational movement between the foresaid members. The type of movement depends on whether the force exerted on the members by a biasing mechanism is exceeded by the torque exerted on the valve plate by a conveyed fluid.

대표청구항 ▼

A butterfly valve comprising in combination: a mounting body forming a flow path extending therethrough; a shaft defining a longitudinal axis thereof that extends across the flow path, the shaft being supported by the mounting body for rotational movement about the axis, a valve plate disposed in th

A butterfly valve comprising in combination: a mounting body forming a flow path extending therethrough; a shaft defining a longitudinal axis thereof that extends across the flow path, the shaft being supported by the mounting body for rotational movement about the axis, a valve plate disposed in the flow path and oriented substantially parallel to the axis, the valve plate being supported by the shaft for rotational movement from a first rotational position maximally restricting flow along the path to a second rotational position maximally permitting flow, the valve plate comprising a first plate-like member having a hole formed therethrough and a second plate-like member secured to the first so as to permit translational movement of the second member in directions substantially parallel to the first member, the second member being variably movable from a first translational position at which the second member spans the hole to maximally restrict flow therethrough to a second translational position at which the second member maximally permits flow through the hole; converting means secured to the shaft and the second member for effecting the translational movement in response to relative rotational movement between the shaft and the valve plate; and biasing means, secured to the valve plate so as to be carried therewith during rotational movement thereof, for resisting the translational movement and urging the second member toward the position at which it spans the hole, whereby the converting means and biasing means are cooperative when the second member is between the first and second translational positions to alternatively effect the translational movement of the second member or the rotational movement of the valve plate in response to rotation of the shaft.