The application of automatic control valves in the power industry (including thermal power, nuclear power, hydropower, new energy, etc.) is mainly concentrated in media control, system protection, energy efficiency optimization, etc. Since the power industry involves high temperature and high pressure, corrosive media, high reliability requirements and other characteristics, the selection and use of automatic control valves must strictly comply with industry standards. The following is a detailed application analysis:

1. Main application scenarios
(1) Thermal power generation (coal-fired, gas-fired)
● Boiler system:

- Feedwater regulating valve: Control the boiler feedwater flow and maintain the stability of the drum water level (to prevent dry burning or full water).

- Main steam valve: Resistant to high temperature and high pressure (up to 600℃, 25MPa), used for opening and closing and regulating the main steam pipeline.

- Safety valve/pressure relief valve: Prevent boiler overpressure explosion (such as spring-loaded safety valve).

● Desulfurization and denitrification (FGD/SCR):

- Corrosion-resistant butterfly valve/rubber-lined valve: Handle flue gas containing SO₂ and NOₓ to prevent acid corrosion.

(2) Nuclear power plant
● Primary circuit system:

- Nuclear-grade gate valve/stop valve: used for coolant (boric acid water) control, the material must be radiation-resistant (such as Z2CN18-10 stainless steel).

- Regulator safety valve: release under abnormal pressure to ensure reactor safety.

● Secondary circuit system:

- Turbine bypass valve: quickly adjust steam flow to avoid turbine overspeed (such as hydraulic fast closing valve).

(3) Hydropower generation
● Turbine control system:

- Guide vane regulating valve: control the flow of water entering the turbine and adjust the power generation.

- Ball valve/butterfly valve: used for pressure pipe maintenance isolation to prevent water hammer effect.

(4) New energy (solar thermal, biomass)
● Solar thermal power generation:

- Molten salt valve: resistant to high temperature (550℃) and molten salt corrosion (such as Inconel 625 material), used in heat transfer system.

● Biomass power generation:

- Wear-resistant ball valve: handles combustion exhaust gas or ash containing particles.

2. Special requirements of the power industry
● High temperature and high pressure tolerance:

- Thermal power valves need to adapt to steam above 540℃, and nuclear power plant valves need to meet ASME III nuclear grade certification.

● High reliability:

- The valve MTBF (mean time between failures) requirements are extremely high, and nuclear power valves need to be **fail-safe (Fail-Safe)** designed.

● Fast response:

- The turbine bypass valve needs to act within 1-2 seconds to prevent the unit from overspeeding.

● Anti-corrosion/anti-scaling:

- Desulfurization valves need to be resistant to Cl⁻ and SO₄²⁻ corrosion, and seawater cooling system valves need to prevent biological attachment.

Summary
Automatic valves are key components for safe and efficient operation of power systems. Their selection needs to comprehensively consider medium parameters, operating conditions severity and reliability requirements. As the power industry transitions to clean energy, valves that are resistant to extreme conditions and intelligent will become the direction of technological development.