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柴油机新的排放要求使发动机设计者重新考虑气门杆密封套的作用。重型柴油机颗粒排放美国联邦标准起自1988年,最初是6g/kW·h,到1994年大幅度降低到1g/kW·h。减少颗粒排放、改善机油消耗和降低气门导管的磨损已成为重型柴油机市场的重要课题。而这三者全都与通过气门杆和气门导管配合间隙的机油量有关。试验台试验表明,在怠速和倒拖工况下,加强型气门杆密封套能使气缸盖部分机油耗降低99%,从而使颗粒排放降低75%,还大大减少增压发动机气门导管磨损和气门杆咬死的发生。
New diesel engine emission requirements allow the engine designer to reconsider the valve stem gland. Heavy-Duty Diesel Particulate Emissions Federal standards have since started in 1988, initially at 6 g / kW · h, drastically reduced to 1 g / kW · h by 1994. Reducing particulate emissions, improving oil consumption and reducing valve guide wear have become important topics in the heavy-duty diesel market. All three are related to the amount of oil that passes through the valve stem and the valve guide. Test bench tests showed that the enhanced valve stem gland reduced engine oil consumption by 99% at idle and towed conditions, resulting in a 75% reduction in particulate emissions and significantly reduced wear on the valve guides and valves of the supercharged engine Rod bite occurred.