Thermal power generation and nuclear power generation are each categorized by their respective heat sources. Oil, coal, or natural gas in the former, or a nuclear reaction in the latter. Both generate electricity by rotating a turbine with high pressure and high temperature steam. Valves and fittings are used in regulating and distribute the steam and water cooling system.
Thermal Power Generation - Thermal power plants operate under conditions of high pressure and high temperature. The latest large scale coal-fired power plants operate at 538～566 °C. Operational steam pressure can reach 24 MPa. Therefore, operability under extreme conditions, material selection, adaptation to rapid temperature fluctuation, and maintaining air tightness are a few of the requirements for valves and fittings.
Nuclear Power Generation - High pressure and high temperature steam is generated in a nuclear reaction and is used to turn turbines in order to generate electricity. Valves help regulate the circulatory system, an important asset in nuclear power plants. Many valves are required for control over radioactive fluid, moderators, coolants, process steam, condensation, water supplies and cooling. Valves used in nuclear power generation plants undergo rigorous inspections, quality control, safety analysis, record checks and production checks for quality assurance.