Trip And Throttle Valve

In a typical steam turbine installation, this is the valve in the steam supply line ahead of the governor valve. This valve is the activating element for overspeed protection and serves as a manual throttle valve, which can be used for testing and startup. It is designed to run full open in normal machine operation and can close very quickly. Typically, it is activated by hydraulic oil pressure. When oil pressure is lost, the valve will fail closed and when oil pressure is normal, the valve can be operated manually.