Exclusive steam turbine AST Solenoid Valve HQ16.17Z

Date:2020/11/17 15:39:03 Visits: Author:Dongfang YOYIK Engineering Co; Ltd,

Exclusive steam turbine AST Solenoid Valve HQ16.17Z

AST system is the automatic stop trip system in steam turbine control. In the AST solenoid valve HQ16.17Z, the control oil passes through an orifice inside the unloading valve and acts on the upper part of the cup-shaped slide valve of the unloading valve. The force of the control oil is combined with the spring force of the small spring inside the unloading valve to press the cup-shaped spool valve of the unloading valve on the valve seat, sealing the oil return channel at the bottom of the main steam valve actuator.


When the unloading valve adjusting rod is rotated out in the reverse direction, or when the AST solenoid valve is de-energized and opened, the AST control oil is connected to the non-pressure return oil, so that the slide valve operates under the action of oil pressure to open the pressure Oil return channel. In this way, the main steam valves are quickly closed under the action of the spring force of the operating seat.



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