ROTARY PLUG, BALL, AND LABORATORY STOPCOCK VALVES WITH ARBITRARY MAPPING OF FLOW TO ROTATION ANGLE AND PROVISIONS FOR SERVO CONTROLS
A system for extending the adjustment range and flow control precision of the flow of materials in a rotary valve is described. The system includes a valve body, an input and an output port penetrating the valve body and providing couplable means to the outside of the valve body, a rotating member deposed in the valve body, and motor or servo connected to the rotating member. The rotating member has two elongated openings, the longer dimensions of the openings are aligned circumferentially and positioned so that they are diagonally opposite of each other on the circumference. A passageway through the rotating member connects the two elongated openings. A motor is coupled to the rotating member and controls the angular rotation within a first range of angular positions overlapping, at least in part, the two ports, and within a second range of angular positions wherein the two elongated opening so not overlap the two ports.
1 . A system for extending the adjustment range and flow control precision of the flow of materials in a rotary valve, the system comprising:
a hollow valve body comprising a at least one input port and one output port penetrating the valve body and providing couplable means to the outside of the valve body, and a rotating member deposed in and in contact with the internal surface of the chamber and the ports;
the rotating member having two elongated openings located on the surface of the rotating member and having their longer dimensions aligned on a circumference of the rotating member and positioned so that they are diagonally opposite of each other on the circumference;
a passageway through the rotating member connecting the two elongated openings thereby permitting a flow through the rotating member; and
a motor rotationally coupled to the rotating member for rotating the rotating member,
wherein the motor controls an angular position of the rotating member to position the two elongated openings of the rotating member within a first range of angular positions overlapping, at least in part, the two ports, and within a second range of angular positions wherein the two elongated opening so not overlap the two ports, and
wherein the system permits a flow of materials between the input port and the output port when the rotating member is positioned within the first range of angular positions and prevents a flow of materials between the ports when the rotating member is positioned within the second range of angular positions.
2 . The system of claim 1 wherein the rotating member is a sphere.
3 . The system of claim 1 wherein the rotating member is a conical plug.
4 . The system of claim 1 wherein the rotating member is a cylindrical plug.
5 . The system of claim 4 wherein the valve body is made of glass, and further wherein the valve body and rotating member form a laboratory glassware stopcock.
6 . The system of claim 1 wherein the valve body is part of an article of laboratory glassware.
7 . The system of claim 1 wherein motor is a servo.
8 . The system of claim 1 wherein motor is controlled by a computer.
9 . The system of claim 1 wherein the angular position of the rotating member is measured by a sensor.
10 . The system of claim 1 wherein the system is controlled by laboratory automation software.