特殊系列调节阀 Special series regulating valve
DC1629D 先导式双层套筒调节阀（可用于蒸汽放空） DC1629D Pilot Double cage Control Valve（Steam vent valve）
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.