What do you know about the atmospheric safety valves of steam turbines?
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Structure and principle of the turbine’s atmospheric safety valve: flow of gas and water. Seeking advice?
When the exhaust pressure of the turbine exceeds atmospheric pressure and the weight of the safety valve stem, it pushes the safety valve open. This type of safety door closes due to its own weight; in order to prevent air leakage when the valve core does not close properly, a path for condensed water is provided for sealing. The function of the handwheel is to manually break the vacuum in case of an emergency shutdown. This type of safety door is not very good, as it requires a high level of precision in grinding the valve core.
How is this water sealed inside? Thank you
The safety valve’s disc and seat achieve sealing through the contact of their polished sealing surfaces, but leakage still occurs. Therefore, water is added to these sealing surfaces to isolate them from air. A small amount of water leaks into the vacuum system through the sealing surfaces, while most of it overflows outside. A continuous water supply valve is provided to replenish the water.