High speed injector with an improved steam valve

An apparatus for mixing a first fluid into a flow path of a second fluid, said apparatus comprising:

• a chamber, which encloses the flow path and which includes a first inlet for receiving the second fluid, a second inlet arranged downstream of the first inlet and receiving the first fluid, as well as an outlet arranged downstream of the second inlet for discharging a mixture of the first fluid and the second fluid, said flow path extending from the first inlet to the outlet and said second inlet opening into the flow path, a throttle body, which is pivotally arranged inside the chamber for controlling the flow area of the flow path;
• and pivoting means, for pivoting the throttle body for said controlling of the flow area, the pivoting means being adapted to pivot the throttle body, so that the flow area decreases with a decreasing flow rate of the second fluid and increases with an increasing flow rate of the second fluid in order to maintain a flow velocity of the second fluid at the second inlet within a predetermined range, wherein the throttle body is in the form of a flap that has a first end that is pivotally arranged in the chamber and a second end that is free, the free end being directly adjacent the second inlet so that the flap maintains the flow rate of the second fluid at the second inlet in a desired range,
• the second inlet including a valve comprising
• a valve spindle housing located in the side of the chamber and including a first fluid inlet and a first fluid outlet, and
• a cylinder open along a portion of a longitudinal axis of the cylinder and rotatably mounted in the valve spindle housing, the cylinder being positioned in one position so that the cylinder completely obstructs the valve spindle housing outlet, not allowing any fluid to pass around the cylinder, the cylinder walls being solid except for having openings through a portion of the cylinder, so that when rotated to a closed position, the solid portion of the cylinder fully obstructs the valve spindle housing outlet, and when rotated to an open position, the first fluid can pass into the inside of the cylinder and then through the openings and out of the valve spindle housing.