In the safety protection system of large steam turbine generator sets, AST and OPC are crucial components, which ensure the rapid and safe shutdown of steam turbines under abnormal conditions. As a key component of this system, the solenoid valve coil 300AA00086A plays the role of executing control signals and driving hydraulic systems.

The solenoid valve coil 300AA00086A is designed for the AST/OPC system of steam turbines and is usually used in pair with plug-in hydraulic valves. When the control system detects dangerous conditions such as speed overrun or load abnormality, it immediately sends an electrical signal to the solenoid valve coil. The current passes through the coil to generate a magnetic field, attracting or releasing the built-in iron core, thereby changing the state of the hydraulic oil circuit. In AST applications, this action quickly opens or closes the oil circuit leading to important hydraulic actuators, triggering the emergency shutdown valve action, and realizing the rapid shutdown of the steam turbine. In the OPC system, it may be used to adjust the steam valve to reduce the load and avoid overload.

Due to its design features, such as fast response time, high reliability and good anti-pollution ability, the 300AA00086A coil can ensure almost instant action after receiving the control signal, which is crucial to prevent equipment damage and ensure personnel safety. Its compact design and optimized fluid dynamics make it work efficiently even under high flow and high pressure conditions, ensuring the accurate execution of emergency shutdown instructions.

Once it is found that the coil does not respond to the control signal, a detailed inspection should be carried out immediately, from the power supply, the coil itself, the oil circuit condition to the control system. Comprehensive inspection to restore the normal function of the system as soon as possible and ensure the safety and stability of the turbine operation.

1. Power supply problem: The most common cause of failure is that the coil does not receive enough power supply voltage or current, which may be caused by wiring errors, power line failure or fuse melting.

2. Coil damage: Long-term use or external physical damage may cause the coil to short or break internally, and cannot generate enough magnetic field to drive the valve core to move.

3. Electromagnetic iron core stuck: The iron core is stuck in the middle position due to foreign matter, wear or corrosion, and cannot move normally, resulting in the coil passing current but the valve does not move.

4. Oil circuit blockage or contamination: Impurities accumulated in the hydraulic system or oil deterioration may block the control oil circuit and affect the normal operation of the solenoid valve.

5. Control system failure: Software errors or hardware failures in the electronic control system that sends control signals may also cause the coil to fail to receive the correct start-up instructions.

6. Environmental factors: Extreme temperatures (too high or too low) may affect the performance of the coil material and cause it to not work properly.


Yoyik offers various types of valves and pumps and its spare parts for power plants:
directional solenoid valve 4WE10D33/CG220N9K4/V
unloading valve HGPCV-02-B10
Sealing components KHWJ10F 1.6P
BLADDER LNXQ-A-10/20 F Y
Shutoff valve F3-CG2V-6FW-10
emergency shut off valve KHWJ10F1.6P
Electro Magnetic Separator PDC-1212
Solenoid valve for hydraulic motor FRD.WJA3.002
oil pump 80LY-80
Moog servo valve G771K201
bladder accumulator hs code NXQ-AB-40 /20-LY
Butterfly Valve BDB-250/150
relief valve BXF-25
needle shut off valve SHV6.4
solenoid valve J-220VDC-DN6-PK/30B/102A
Mechanical Stop Electromagnet DF2025
gear pump suppliers 2CY-45/9-1A
Yx type seal ring d280
overflow valve YSF16-55*130KKJ