Seal-less valves
A valve assembly including a valve body, an outer housing having rotating shaft containing magnets and being driven by a motor, an inner housing statically sealed to the valve body, and an actuation system enclosed within the inner housing, the actuation system having magnets that are induced by magnetic field created by the rotating shaft magnets.
1. A valve assembly, comprising:
a valve body comprising a stem;
an outer housing having a rotating shaft disposed therein, the rotating shaft including an outer magnetic rotor comprising a solid rotor, or a radial disc connected to a ring-shaped outer magnetic rotor ring, wherein the rotating shaft is driven by a motor;
a single piece inner housing, that does not comprise a fluid passageway therethrough, having a portion surrounding and extending adjacent to the stem and configured to allow rotary motion of the stem, the inner housing statically sealed to the valve body by a ring seal engaging an outer surface of the inner housing and a surface of the valve body, and the outer housing statically sealed to the inner housing, the inner housing extending within the outer housing; and
an actuation system substantially enclosed on all sides within the inner housing by the inner housing, the actuation system having magnets that are induced by magnetic field created by the magnets of the rotating shaft, the actuation system in communication with the stem, the stem having a valve closure element located at an end of the stem opposite the actuation system, the stem and the valve closure element being coaxial with the rotating shaft.
2. The valve assembly of claim 1 , wherein the stem is a rotary stem.
3. The valve assembly of claim 1 , wherein the valve body comprises an integrated, statically sealed bonnet coupled to the stem.
4. The valve assembly of claim 1 , wherein the actuation system comprises a rotary device.
5. The valve assembly of claim 1 , wherein the valve assembly comprises a control valve, on-off valve, or rotary valve assembly.
6. The valve assembly of claim 1 , wherein the rotating shaft is in contact with the motor.
7. The valve assembly of claim 6 , further comprising a gear box disposed between the rotating shaft and the motor.
8. The valve assembly of claim 1 , wherein at least one inner magnet is disposed within the inner housing, and the inner housing comprises an alloy housing.
9. The valve assembly of claim 8 , wherein the at least one inner magnet comprises a plurality of evenly circumferentially spaced individual magnet elements.
10. The valve assembly of claim 8 , wherein the at least one inner magnet faces an outer magnet on the rotating shaft.
11. A valve assembly, comprising:
a valve body comprising a stem;
an outer housing having a rotating shaft disposed therein, the rotating shaft containing at least one outer magnetic rotor comprising a plurality of evenly circumferentially-spaced individual magnet elements, wherein the rotating shaft is driven by a motor;
a single piece inner housing, that does not comprise a fluid passageway therethrough, having a portion surrounding and extending adjacent to the stem and configured to allow rotary motion of the stem, the inner housing statically sealed to the valve body by a ring seal engaging an outer surface of the inner housing and a surface of the valve body, and the outer housing statically sealed to the inner housing, the inner housing extending within the outer housing;
an actuation system substantially enclosed on all sides within the inner housing by the inner housing, the actuation system surrounded laterally by the outer housing, the actuation system having at least one inner magnet that is induced by magnetic field created by the at least one outer magnet of the rotating shaft, the actuation system being in communication with the stem, the stem having a closure element located at an end of the stem opposite the actuation system, the stem and the valve closure element being coaxial with the rotating shaft; and
a gear box disposed between the rotating shaft and the motor.
12. A valve assembly, comprising:
a valve body having an integrated, statically sealed bonnet coupled to a stem;
an outer housing having a rotating shaft disposed therein, the rotating shaft containing at least one outer magnet, wherein the rotating shaft is driven by a motor, wherein the rotating shaft includes an outer magnetic rotor, wherein at least one outer magnet is located on an inside face of the outer magnetic rotor;
a single piece inner housing, that does not comprise a fluid passageway therethrough, having a portion surrounding and extending adjacent to the stem and configured to allow rotary motion of the stem, the inner housing statically sealed to the valve body by a ring seal engaging an outer surface of the inner housing and a surface of the valve body, and the outer housing statically sealed to the inner housing, the inner housing extending within the outer housing, the at least one outer magnet of the rotating shaft located annularly between the inner housing and the outer housing;
an actuation system substantially enclosed on all sides within the inner housing by the inner housing, the actuation system surrounded laterally by the outer housing, the actuation system having at least one inner magnet that is induced by magnetic field created by the at least one outer magnet of the rotating shaft, the actuation system being in communication with the stem, the stem having a closure element located at an end of the stem opposite the actuation system, the stem and the valve closure element being coaxial with the rotating shaft; and
a gear box disposed between the rotating shaft and the motor.