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排气阀受高温作用和热应力及周期应力等大的应力作用。因此,必须选择能承受各种应力的气阀合金。排气阀是密封高温气体的,所以废气和固体燃料产物必然会腐蚀和磨损气阀。 这些变化的因素和其它与工作条件有关的因素相结合,能造成两种主要型式的气阀损坏——烧蚀和断裂。烧蚀是由于气阀和阀座的研配面漏气造成废气冲刷、侵蚀或融化阀座表面而引起的,这是气阀损坏的主要型式。气阀座变形和积炭是引起烧蚀的最普通原因。
Exhaust valve by the role of high temperature and thermal stress and periodic stress and other large stress. Therefore, you must choose the valve can withstand a variety of stress alloy. Exhaust valve is sealed high temperature gas, so exhaust and solid fuel products will inevitably corrode and wear valve. These changing factors combined with other factors related to working conditions can cause two major types of gas valve damage - ablation and rupture. Ablation is caused by gas leaks on the seating surfaces of the valve and seat causing erosion, erosion or thawing of the seat surface. This is the main type of valve damage. Gas valve seat deformation and carbon deposition is the most common cause of ablation.