초록 ▼

A ball valve for controlling upstream to downstream fluid flow, for example, from an apertured tank bottom, has a housing body for bolted-on mounting. The housing has a flow passageway therethrough that angles between its upstream and downstream portions and that is controlled by a valve ball rotata

A ball valve for controlling upstream to downstream fluid flow, for example, from an apertured tank bottom, has a housing body for bolted-on mounting. The housing has a flow passageway therethrough that angles between its upstream and downstream portions and that is controlled by a valve ball rotatably positioned in and sealed-off within its upstream portion. A resilient, L or ladle-shaped annular gasket is positioned upstream at the joint between the valve housing and the tank bottom and in engagement with the ball adjacent an upstream end portion of its open-end flow passage and, in such a manner as to maintain the flow area of such passage. A rigid annular back-up ring fits and outwardly abuts within and against the gasket in such a manner as to provide a three-way pressure seal of the gasket in which the ball is sealed off with respect to the flow-passageway, the housing is sealed-off with respect to the ring, and the ring is sealed-off with respect to the tank bottom when the housing is bolt-secured to project from the tank bottom. An operating stem for the ball is provided with a key-like, operating end portion to axially receive a complementary bore of an operating handle.

대표청구항 ▼

In an improved ball valve having a housing with upstream and downstream opening-defining end portions and a through passageway therebetween for cooperative aligned mounting one of its end portions on an apertured member, a resilient annular gasket adapted to be positioned between the one end portion

In an improved ball valve having a housing with upstream and downstream opening-defining end portions and a through passageway therebetween for cooperative aligned mounting one of its end portions on an apertured member, a resilient annular gasket adapted to be positioned between the one end portion of said housing and the apertured member, said gasket having a base portion defining an open passageway between the apertured member and the housing, a valve ball having spheroid and elliptical shaped outer wall portions and a flow-passageway therethrough, means rotatably mounting said ball for movement within the housing into and out of fluid flow-through relation between the upstream and downstream end portions of the housing, and said means also being adapted to move said elliptical shaped wall portion of said ball into non-sealing alignment with said gasket when its flow-passageway is in a flow-through relation and to move said spheroid-shaped wall portion of said ball into alignment with and into a full fluid-flow sealing-off relation with said gasket when the flow-passageway of the ball is fully closed.