特殊系列調節閥                                                                                                         Special series regulating valve

DC1629D 先導式雙層套筒調節閥（可用于蒸汽放空）                                                 DC1629D Pilot Double cage Control Valve（Steam vent valve）

DC1629D先導式低噪音調節閥（可用于蒸汽放空）的基本型為直通式閥體、先導平衡式閥芯、低噪音或多級降壓低噪音的套筒調節閥，應用于非常嚴酷的工況。流體主要由特殊鉆孔的套筒調節，套筒為閥芯提供全行程連續導向。流關式結構在閥門關閉時依靠流體流關產生的不平衡力保證閥芯密封實現嚴密切斷。特殊設計的先導平衡式閥芯僅需很小的推力即可打開閥門。設計的全金屬導向環以及金屬硬密封能夠保證566℃高溫工況下可滿足GB/T4213泄漏等級V級，并無實際使用的溫度限制。

除了先導式閥內件外，其余零件都能和DC1624系列調節閥互換。

The DC1629Dpilot 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.