There are some differences in design and application between the servo valve FRD.WJA5.021 used in the DEH control system of power plant steam turbines and other servo valves. DEH control system is a digital electro-hydraulic control system used for speed regulation and load control of steam turbines. Here are some possible differences:

1. Control principle: The turbine servo valve FRD.WJA5.021 adopts the principle of electro-hydraulic servo control, which regulates the output of the hydraulic system by controlling the movement of the hydraulic valve core through electrical signals. Other servo valves may adopt different control principles, such as electric servo, pneumatic servo, etc.

2. Control accuracy: The DEH control system requires high control accuracy for turbine speed regulation and load control to ensure stable system operation and precise load regulation. Therefore, the servo valve FRD.WJA5.021 has high control accuracy and stability.

3. System integration: The steam turbine DEH control system is an integrated control system that combines hydraulic control and electronic control, and achieves precise control and monitoring of the system through digital technology. Therefore, the servo valve FRD.WJA5.021 needs to be well integrated and coordinated with other components of the system.

4. System Safety: The DEH control system has high requirements for the safety of power plant steam turbines, so the servo valve FRD.WJA5.021 needs to have certain safety functions, such as overload protection, emergency shutdown, etc., to ensure that the system can safely shut down or switch to a backup system in case of a fault.

Yoyik can offer other hydraulic pumps or valves for power plants as below:
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Mechanical Seal-N.D.E L270/102