초록 ▼

A butterfly valve disk is rotatably mounted within a passageway formed in the valve body and an annular seal fitted in the valve body projects within the passageway. A peripheral annular bearing surface formed on the valve disk is applied against the annular seal in the closed position. The valve di

A butterfly valve disk is rotatably mounted within a passageway formed in the valve body and an annular seal fitted in the valve body projects within the passageway. A peripheral annular bearing surface formed on the valve disk is applied against the annular seal in the closed position. The valve disk carries a stop which is brought to bear on an internal surface of the valve in order to prevent rotational displacement of the valve disk beyond its normal position of closure.

대표청구항 ▼

In a butterfly valve comprising a valve body, a passageway within said body, a butterfly valve closure disk rotatably mounted within said passageway about an axis located at right angles to the axis of the passageway, an annular seal carried by the body and projecting within the interior of said pas

In a butterfly valve comprising a valve body, a passageway within said body, a butterfly valve closure disk rotatably mounted within said passageway about an axis located at right angles to the axis of the passageway, an annular seal carried by the body and projecting within the interior of said passageway, the valve disk being movable about said axis between an opening position and a closure position in which an annular bearing surface formed at the periphery of the valve disk bears on the seal, the annular bearing surface of the valve disk being a portion of the surface of a sphere the center of which is located substantially at the intersection of the axis of rotation of the valve disk and the axis of the passageway; the improvement in which the valve disk carries a stop which is so positioned as to be in abutment against an internal surface of the valve other than said annular seal when the valve disk is in the closure position.