In the steam turbine system of modern power plants, the AST (Auto Stop Trip) solenoid valve is one of the key components to ensure the safe operation of the steam turbine. Among them, the AST solenoid valve 165.31.56G03 is widely used in the control systems of various steam turbines due to its excellent performance and reliable protection function.

AST solenoid valve 165.31.56G03 is an electromagnetic control valve. Its core function is to control the movement of the valve core by energizing and de-energizing the electromagnetic coil, thereby realizing the on-off of the hydraulic oil circuit. In the control system of the steam turbine, the on-off of the hydraulic oil circuit is directly related to the opening and closing of the steam inlet valve of the steam turbine, which in turn affects the operating state of the steam turbine. When the electromagnetic coil is energized, the electromagnetic force generated overcomes the elastic force of the spring, sucks up the valve core, and makes the hydraulic oil circuit conductive; when the electromagnetic coil is de-energized, the elastic force of the spring pushes the valve core back to its original position, cutting off the hydraulic oil circuit. This fast response feature enables the AST solenoid valve to achieve precise and rapid control functions in the control system of the steam turbine.

AST solenoid valve 165.31.56G03 plays a vital role in the protection system of the steam turbine. During the operation of the steam turbine, various abnormal conditions may be encountered, such as overspeed, excessive shaft vibration, low lubricating oil pressure, etc., which may cause serious damage to the steam turbine and even cause safety accidents. When the monitoring system of the steam turbine detects the above abnormal conditions, it will quickly send a signal to de-energize the AST solenoid valve and cut off the hydraulic oil circuit, causing the steam inlet valve of the steam turbine to close quickly, cutting off the steam supply and causing the steam turbine to shut down urgently. This fast response protection mechanism can effectively prevent the steam turbine from being damaged due to abnormal conditions, ensure the safe operation of the steam turbine, and reduce equipment maintenance costs and downtime.

In addition to the protective role in emergency situations, AST solenoid valve 165.31.56G03 also plays an important role in the startup and normal operation of the steam turbine. When the steam turbine is started, it is necessary to establish hydraulic oil pressure through the AST solenoid valve to provide power for the steam inlet valve of the steam turbine to open. When the control system issues a start command, the AST solenoid valve is energized, the hydraulic oil circuit is connected, and the hydraulic oil enters the control cylinder of the steam inlet valve, pushing the valve open, allowing steam to enter the steam turbine and drive the turbine to rotate. This process requires precise control to ensure the smooth start of the steam turbine and avoid turbine vibration or other abnormal conditions caused by excessive or insufficient steam flow. During the normal operation of the steam turbine, the AST solenoid valve maintains the pressure stability of the hydraulic oil system to ensure that the turbine speed control system can accurately control the speed of the steam turbine so that it can operate stably at the rated speed.

AST solenoid valve 165.31.56G03 has many advanced technical features and significant advantages, enabling it to adapt to complex industrial environments and ensure long-term stable operation. First of all, the solenoid valve uses high-quality electromagnetic coils and sealing materials to ensure reliability and durability in long-term operation. Its sealing form is a soft seal type, which can effectively prevent hydraulic oil leakage and ensure the sealing performance of the system. Secondly, the AST solenoid valve has a fast response speed. It can complete the power-on and power-off operation of the electromagnetic coil in a short time, realize the rapid on and off of the hydraulic oil circuit, and meet the requirements of the steam turbine control system for rapid response. In addition, the nominal diameter of the solenoid valve is 6mm, which can adapt to the requirements of hydraulic oil circuits with different flow rates and ensure the stable operation of the steam turbine under different working conditions.

AST solenoid valve 165.31.56G03 plays an irreplaceable role in the operation of steam turbines in power plants. It is not only a key executive component of emergency shutdown in the protection system of the steam turbine, but can quickly cut off the steam supply under abnormal conditions to ensure the safety of the steam turbine; it also ensures the smooth start and stable operation of the steam turbine by accurately controlling the on and off of the hydraulic oil circuit during the start-up and normal operation of the steam turbine. Its high reliability, rapid response and precise control characteristics make it an indispensable and important component in the steam turbine control system, providing a strong guarantee for the safe and efficient operation of the power plant.

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