Magnetically actuated pipe valve with torque-limiting clutch and position indication
A valve includes a magnetic actuation mechanism providing torque-limiting capabilities and valve stem position indication. A drive shaft of the valve is surrounded by a first annular magnetic array within a fully sealed pressure vessel. A second annular magnetic array is positioned outside of the pressure vessel and surrounds the fully sealed pressure vessel. Each of the first annular magnetic array and the second annular magnetic array include magnets having alternating polarity, allowing the first annular magnetic array and the second annular magnetic array to form a first order coupling mechanism. When the second, outside annular magnetic array is rotated, the first annular magnetic array is caused to move, actuating the valve. Importantly, the valve includes a position indication system able to determine a position of the valve stem and includes an automatic feedback mechanism for comparing an actual position of the valve with an expected position of the valve.
1 . A magnetically actuated valve with a magnetic clutch, comprising:
an actuator stem, rotation of which is configured to actuate the valve, causing the valve to move between an open position, a closed position, and one or more semi-open positions;
a magnetic clutch, wherein the magnetic clutch includes an outer magnetic array, wherein the outer magnetic array includes a plurality of constituent magnets or a plurality of distinct magnetic domains, surrounding a segment of the actuator stem;
a valve housing, defining a pressure vessel of the valve, encapsulating the actuator stem, wherein the outer magnetic array surrounds a section of the valve housing; and
a position indicator attached to an outside surface of the valve housing configured to detect a configuration of the valve;
wherein the plurality of constituent magnets or the plurality of distinct magnetic domains in the outer magnetic array are organized as a Halbach array;
wherein the magnetic clutch is configured to slip without breaking the actuator stem;
wherein the magnetic clutch is configured to automatically reset and realign after slipping due to tight spacing of the plurality of constituent magnets or the plurality of distinct magnetic domains;
wherein actuation of the outer magnetic array applies torque, thereby actuating the actuator stem.
2 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein the valve housing includes at least one transparent or translucent window providing for visualization of the configuration of the valve.
3 . The magnetically actuated valve with a magnetic clutch of claim 1 , further comprising at least one digital display connected to the valve housing configured to receive data from the position indicator and to display the configuration of the valve.
4 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein the valve is a quarter turn valve or a rising stem valve.
5 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein the valve includes an inner magnetic array and/or a plurality of ferromagnetic metal elements on which torque is able to be applied by the outer magnetic array.
6 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein the position indicator includes at least one magnetic sensor.
7 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein a plurality of radially spaced apart ferrous elements are embedded in a wall of the valve housing proximate to the outer magnetic array.
8 . The magnetically actuated valve with a magnetic clutch of claim 1 , wherein the outer magnetic array is connected to at least one actuator, and wherein the at least one actuator receives commands wirelessly via a remote user device.