초록 ▼

A butterfly-type check valve (30) employs a secondary check valve (38) that is carried on the valve plate (36). The valve plate (36) is revolvable and translatable relative to the pivot shaft (34). In operation, the check valve (30) opens in response to a change in aerodynamic forces which act on th

A butterfly-type check valve (30) employs a secondary check valve (38) that is carried on the valve plate (36). The valve plate (36) is revolvable and translatable relative to the pivot shaft (34). In operation, the check valve (30) opens in response to a change in aerodynamic forces which act on the valve plate (36), the change being effected as a response to the opening of the secondary check valve (38). As the valve plate (36) rotates to an open position, its revolutionary movement relative to the shaft (34) changes the location of pivot points (40) relative to the surface (62) of the plate. This changes the areas (42, 44) of the surface (62) on both sides of the pivot points (40) so that the aerodynamic forces cause the valve (30) to open still further.

대표청구항 ▼

A butterfly-type check valve, comprising: a duct defining an elongate flow path for fluid a shaft supported across said duct and extending transversely across said flow path, said shaft defining a longitudinal axis: a plate-like valve member having a hole formed therethrough; said member being dispo

A butterfly-type check valve, comprising: a duct defining an elongate flow path for fluid a shaft supported across said duct and extending transversely across said flow path, said shaft defining a longitudinal axis: a plate-like valve member having a hole formed therethrough; said member being disposed in said flow path substantially parallel to said shaft: said member being secured to said shaft such that said member is capable of both revolutionary and translational movement relative to said axis; and gating means secured to said member and cooperable therewith for forming a secondary check valve that is operable to permit flow through said hole in one direction and to substantially prevent flow through said hole in an opposite direction.