The test solenoid valve 22FDA-F5T-W110R-20/LV is a key component of the power plant steam turbine speed control system and lubricating oil control. Its design combines fluid dynamics and electromagnetic control technology, which can achieve precise regulation and safety protection of the turbine operation status. The following is a discussion on structure, function, working principle and optimization direction.

Structure and technical characteristics

The test solenoid valve 22FDA-F5T-W110R-20/LV adopts a modular design, and the core components include electromagnetic coils, valve cores, valve seats and seals. Its valve body supports quick installation, and can achieve normally closed or normally open configuration (such as AST or OPC type) by adjusting the position of the internal throttle hole. For example, the AST type solenoid valve is adapted to the external high-pressure oil supply, driven by an AC electromagnet, and remains normally open when power is lost; while the OPC type relies on the internal oil supply system, is equipped with a DC electromagnet, and automatically closes when power is lost. The valve body has been optimized for long-term operation under high temperature and high pressure environment, and the compatible media include lubricating oil, steam and hydraulic oil.

Function Implementation and Operation Mechanism

1. Load Control

By adjusting the opening of the steam inlet valve of the steam turbine, the steam flow and unit load are directly controlled. When the system needs to increase the load, the solenoid valve drives the steam inlet valve to increase the opening to increase the steam flux; otherwise, the opening is reduced to reduce the load. This process needs to cooperate with the feedback signal of the speed control system to achieve dynamic balance.

2. Exhaust Pressure Regulation

At the exhaust end, the solenoid valve controls the opening and closing amplitude of the exhaust valve to maintain the stability of the exhaust pressure and temperature. For example, when the exhaust pressure exceeds the threshold, the valve opening increases to release excess steam to prevent the last stage blades of the turbine from overloading.

3. Safety Protection Function

If faults such as overload, abnormal shaft temperature or excessive vibration are detected during the operation of the turbine, the solenoid valve can instantly cut off the gasoline inlet line and trigger an emergency shutdown (ETS). For example, the AST solenoid valve automatically opens the pressure relief channel after power failure, ensuring that the shutdown process is fast and reliable and avoiding mechanical damage caused by rotor inertia.

Performance advantages and technical challenges

1. Fast response and precise control

The test solenoid valve 22FDA-F5T-W110R-20/LV uses a high-sensitivity electromagnet with an action response time of less than 50ms, which can meet the millisecond-level regulation requirements of the turbine. Its valve core stroke is linearly related to the flow rate, supports 0-100% stepless regulation, and the accuracy error is ≤2%.

2. Environmental adaptability

The valve body material is made of corrosion-resistant alloy (such as 316L stainless steel), and the seal is made of polytetrafluoroethylene composite material, which can operate stably under 150℃ and 20MPa conditions. However, long-term high-pressure shock may cause wear of the seal, which needs to be replaced regularly.

3. System integration and maintenance

This type of solenoid valve is compatible with mainstream DCS systems and supports remote status monitoring and fault diagnosis. During maintenance, it is necessary to focus on the oil cleanliness (NAS level 8 or below) and the insulation performance of the electromagnetic coil to avoid malfunction due to impurity blockage or coil aging.

The test solenoid valve 22FDA-F5T-W110R-20/LV has become a core component of the steam turbine control system of a modern power plant due to its high reliability, fast response and multiple protection functions. As the power system’s requirements for unit flexibility increase, its technological iteration will further promote the improvement of power plant safety and economy.

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