Ball valve with orifice

Claim 2

A ball valve comprising a valve housing, a fluid flow passage communicated with said valve housing on the opposite sides thereof, a ball having a first through hole for rough control of fluid flow rotatably provided in said valve housing, said ball being rotatable about an axis extending through the center thereof and extending at a right angle with respect to the first through hole and said fluid flow passage, said first through hole being brought into communication with said fluid flow passage by the revolution of the ball, a means for revolving said ball about said axis, a second through hole of smaller diameter than said first through hole extending through said ball at a certain angle with said first through hole in a plane including said through hole and extending perpendicular to said axis of revolution, and an interchangeable orifice for fine control of fluid flow removably mounted in said second through hole whereby rough or fine control of fluid flow is selectively conducted by selectively bringing one of said through holes into communication with said fluid flow passage, said orifice comprising an orifice plate having an orifice opening and an orifice holding member screwed into said fluid passage to hold said orifice plate in the fluid passage, and said valve housing being provided with a removable cover on one side thereof so that the orifice can be interchanged with a different orifice.

Claim 3

A ball valve comprising a valve housing, a fluid flow passage communicated with said valve housing on the opposite sides thereof, a ball having a first through hole for rough control of fluid flow rotatably provided in said valve housing, said ball being rotatable about an axis extending through the center thereof and extending at a right angle with respect to the first through hole and said fluid flow passage, said first through hole being brought into communication with said fluid flow passage by the revolution of the ball, a means for revolving said ball about said axis, a second through hole of smaller diameter than said first through hole extending through said ball at a certain angle with said first through hole in a plane including said through hole and extending perpendicular to said axis of revolution, and interchangeable orifice for fine control of fluid flow removably mounted in said second through hole whereby rough or fine control of fluid flow is selectively conducted by selectively bringing one of said through holes into communication with said fluid flow passage, said orifice comprising an orifice plate having an orifice opening and an orifice holding member screwed into said fluid passage to hold said orifice plate in the fluid passage, and further comprising a third through hole extending through said ball at a different angle from said certain angle with respect to said first through hole in said plane, and a second orifice provided in said third through hole.

Claim 4

A ball valve comprising a valve housing, a fluid flow passage communicated with said valve housing on the opposite sides thereof, a ball having a first through hole for rough control of fluid flow rotatably provided in said valve housing, said ball being rotatable about an axis extending through the center thereof and extending at a right angle with respect to the first through hole and said fluid flow passage, said first through hole being brought into communication with said fluid flow passage by the revolution of the ball, a means for revolving said ball about said axis, a second through hole of smaller diameter than said first through hole extending through said ball at a certain angle with said first through hole in a plane including said through hole and extending perpendicular to said axis of revolution, and interchangeable orifice for fine control of fluid flow removably mounted in said second through hole whereby rough or fine control of fluid flow is selectively conducted by selectively bringing one of said through holes into communication with said fluid flow passage, said orifice comprising an orifice plate having an orifice opening and an orifice holding member screwed into said fluid passage to hold said orifice plate in the fluid passage, and further comprising a third through hole extending through said ball at a different angle from said certain angle with respect to said first through hole in said plane, and a second orifice provided in said third through hole.