特殊系列调节阀 Special series regulating valve
DC1629导式低噪音套筒调节阀（可用于蒸汽放空） DC1629L Pilot operated low noise control valve
DC1629导式低噪音调节阀（可用于蒸汽放空）的基本型为直通式阀体、先导平衡式阀芯、低噪音或多级降压低噪音的套筒调节阀，应用于非常严酷的工况。流体主要由特殊钻孔的套筒调节，套筒为阀芯提供全行程连续导向。流关式结构在阀门关闭时依靠流体流关产生的不平衡力保证阀芯密封实现严密切断。特殊设计的先导平衡式阀芯仅需很小的推力即可打开阀门。设计的全金属导向环以及金属硬密封能够保证566℃高温工况下可满足GB/T4213泄漏等级V级，并无实际使用的温度限制。
除了先导式阀内件外，其余零件都能和DC1624系列调节阀互换。
The DC1629L pilot low noise control valve (steam vent valve) is a straight-through valve body, pilot balanced spool, low noise and multi-stage step-down sleeve regulator for very severe service conditions. The fluid is mainly adjusted by a special bored sleeve, which provides a full stroke continuous guide for the spool. The flow-closed structure relies on the unbalanced force generated by the fluid flow when the valve is closed to ensure that the valve core seal is tightly closed. The specially designed pilot balanced spool opens the valve with a small thrust. The patented all-metal guide ring and pure metal hard seal can guarantee the GB/T4213 leakage level V under 566 °C high temperature conditions, and there is no practical temperature limit.
Except for the pilot valve trim, the remaining parts can be interchanged with the DC1624 series regulator.
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