SYSTEM AND DEVICE FOR OVER-SPEED PROTECTION OF A TURBO-MACHINE

摘要

A system and device to prevent damage during over-speed condition in a turbo-machine. In one embodiment, the system includes a fluid circuit with a header, which couples to the turbo-machine, and a hydraulic circuit through which fluid evacuates the header to a drain during the over-speed condition. The hydraulic circuit includes a trip header manifold with a pilot element in flow connection with a drain valve element having an actuator to regulate flow of fluid from the header. For example, the pilot element uses a pair of solenoid valves to change pressure of a fluid in the drain valve element and maintains the actuator in a first position to prevent fluid evacuation during normal operating conditions. When over-speed condition is detected, the solenoid valves change state, reducing the pressure of the fluid, permitting the actuator to move to a second position placing the header in flow connection with the drain.

主权项

1. A device for preventing damage in a turbo-machine, said device comprising:
a pilot element comprising a first pilot valve and a second pilot valve in flow connection with the first pilot valve and an actuator element configured to allow fluid to flow through the first pilot valve and the second pilot valve in response to a signal indicative of an over-speed condition in the turbo-machine; and a drain valve element in flow connection with the pilot element, the drain valve element comprising an actuator with a first position to prevent fluid flow through the drain valve element and a second position to permit fluid flow through the drain valve element, wherein the drain valve element is configured to change from the first position to the second position in response to fluid flow across both of the first pilot valve and the second pilot valve, and wherein the drain valve element is configured to change from the first position to the second position to deactivate the turbo-machine to prevent damage to the turbo-machine.