Shut-off rotary valve, particularly for gas turbine
A valve for use in a gas turbine. The valve includes at least one valve body, at least first, second and third fluid delivery pipes positioned on the valve body, at least one outlet pipe positioned on the valve body and a rotatable spherical shutter inside the valve body (and including first and second distribution channels formed within the shutter so as to allow the outlet pipe to be selectively connected to one of the delivery pipes during rotation of the shutter.
1. A valve for use in a turbine, the valve comprising:
a valve body;
at least first, second and third fluid delivery pipes positioned on the valve body;
at least one outlet pipe positioned on the valve body; and
a rotatable spherical shutter inside the valve body and comprising first and second distribution channels formed on the shutter such that:
in a first position of the shutter, the first distribution channel is configured to allow fluid communication between the first delivery pipe and the outlet pipe;
in a second position of the shutter, the first distribution channel is configured to allow fluid communication between the second delivery pipe and the outlet pipe; and
in a third position of the shutter, the second distribution channel is configured to allow fluid communication between the third delivery pipe and the outlet pipe,
wherein the first distribution channel of the shutter comprises a first portion that traverses the shutter for connection of the first delivery pipe and the outlet pipe in the first position of the shutter, and a second portion extending from the first portion and positioned on an external surface of the shutter for connection of the second delivery pipe and outlet pipe in the second position of the shutter.
2. The valve according to claim 1 , wherein the first portion comprises a cylindrical portion.
3. The valve according to claim 1 , wherein the valve body comprises a plurality of outlet pipes, the first and second distribution channels of the shutter being configured to allow supply to all the outlet pipes.
4. The valve according to claim 1 , wherein the first and second distribution channels are formed on the shutter by machining.
5. The valve according to claim 1 , wherein the first and second distribution channels of the shutter extend in separate planes to each other in order to avoid fluid communication between the channels.
6. The valve according to claim 1 , wherein the shutter is rotatable about a transverse axis relative to the delivery pipes and the outlet pipe.
7. The valve according to claim 1 , further comprising a cooling circuit located inside the valve body and configured to allow a cooling fluid to flow therein.
8. The valve according to claim 7 , wherein the cooling circuit surrounds the shutter.
9. The valve according to claim 1 , further comprising at least one evacuation drain extending from inside the valve body with an opening in a housing of the said valve body inside of which the shutter is fitted.
10. The valve according to claim 1 , wherein the valve body is spherical.
11. A supply system for a turbine, comprising the valve according to claim 1 .
12. The supply system according to claim 11 , wherein the first portion comprises a cylindrical portion.
13. The supply system according to claim 11 , wherein the second portion comprises a circumferential portion.
14. The valve according to claim 1 , wherein the second portion comprises a circumferential portion.