| 摘要 |
A combustion turbine control valve comprising a fuel passage to a combustion chamber, a control valve assembly to meter fuel flow to the combustion chamber, the control valve assembly comprising a metering valve body having a valve seat, a metering valve plug movable relative to the body from an open to a closed position, a chamber separated from the flow passage by the plug, the plug having a first area exposed to the chamber, a second area exposed to the flow passage when in the open position and a third area exposed to the flow passage when in the closed position, the first area being greater than the third area and equal to or less than the second area, a passage connecting the chamber and the upstream side of the flow passage, and an actuator to actuate the body between the closed and open positions. |
| 主权项 |
1. A combustion turbine control valve comprising:
a fuel intake flow passage to a combustion chamber of a combustion turbine; a control valve assembly configured to meter fuel flow through said flow passage to said combustion chamber from an upstream side to a downstream side, said control valve assembly comprising:
a metering valve body having a valve seat defining an inlet port in said flow passage between said upstream side and said downstream side;a metering valve plug movable relative to said metering valve body from an open position to a closed seated position to control fuel flow through said inlet port from said upstream side to said downstream side;a chamber separated from said flow passage by said metering valve plug;said metering valve plug having a first pressure-affective area exposed to said chamber, a second pressure-affective area exposed to said flow passage when in said open position, and a third pressure-affective area exposed to said flow passage when in said closed seated position;said metering valve body and said metering valve plug configured and arranged such that said first pressure-affective area is greater than said third pressure-affective area; anda chamber passage connecting said chamber and said upstream side of said flow passage when said metering valve plug is in said closed seated position; and an actuator configured and arranged to actuate said metering valve body between said closed seated position and said open position;
wherein, when said metering valve body is in said closed seated position, pressure in said upstream side of said passage is transferred to said chamber and will urge said metering valve body to remain in said closed seated position. |
