EMERSON P144.R4

EMERSON P144.R4是艾默生Sempell P系列锻造高压蒸汽调节阀，配置多级降噪抗冲蚀阀内件与压力平衡阀芯，专为电站疏水、辅助蒸汽及小型旁路调压工况设计。

EMERSON P144.R4 is forged high-pressure steam control valve from Sempell P series, fitted with multi-stage low-noise anti-erosion trim and balanced plug for drain, auxiliary steam and small bypass regulation.

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采用压力密封阀盖、硬质合金堆焊阀座、可复紧石墨填料函，阀体为锻造材质，标准对焊端，适配气动或电动执行机构，适合高温高压、变负荷交变温度的蒸汽回路。

It features pressure seal bonnet, hardfaced seat, retightenable graphite packing and forged body with butt-weld ends, compatible with pneumatic or electric actuators for cyclic high-temperature high-pressure steam service.

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Main Specifications 技术参数

1. Product Series / 产品系列：Emerson Sempell P Series High Pressure Steam Valve
2. Part Numbers / 型号编码：P144.R4
3. Function Type / 类型：High Pressure Steam Control Valve 高压蒸汽调节阀
4. Key Features / 特性：Forged body, balanced plug, multi-stage trim, pressure seal bonnet, butt weld ends
5. Compatibility / 配套：Pneumatic / Electric Actuators, DVC Positioner, Drain & Auxiliary Steam Loop

Core Functions 核心功能

1. 多级节流阀内件逐级降压，降低流速噪音，抑制气蚀与介质冲蚀损伤。
Multi-stage trim for staged pressure drop, reducing throttling noise and resisting cavitation and erosion.
2. 压力平衡阀芯结构，降低执行机构推力需求，调节响应平稳灵敏。
Pressure balanced plug reduces actuator force requirement for stable and responsive regulation.
3. 压力密封阀盖，压力越高密封越紧密，有效控制高温蒸汽外泄漏。
Pressure seal bonnet delivers tighter sealing under higher steam pressure to minimize fugitive emission.
4. 阀座密封面堆焊硬质合金，耐高速蒸汽冲刷，延长阀门检修周期。
Hardfaced seating surface withstands high velocity steam flow for long service interval.
5. 石墨填料可现场紧固，适应机组启停热循环，维护简单便捷。
Graphite packing can be retightened on-site to accommodate thermal cycling during unit start and shutdown.

Application Scenarios 应用场景

1. 火电厂、联合循环机组锅炉疏水、放汽回路原有调节阀替换。
Replacement of control valves on boiler drain and vent circuits for thermal and combined cycle units.
2. 厂用辅助蒸汽管网压力、流量连续稳压调节。
Continuous pressure and flow stabilization for plant auxiliary steam distribution networks.
3. 小型汽轮机旁路、预热管路、连续排污系统压力控制。
Pressure control for small turbine bypass, pre-warming lines and continuous blowdown systems.
4. 炼化、化工自备电站蒸汽系统大修技改备件储备。
Spare inventory for overhaul and retrofits of captive power steam systems in refineries.
5. 出口备件供货，含水压试验、密封性检验、定位器联调测试。
Overseas spare supply with hydrostatic test, leak inspection and positioner commissioning.

FAQ 常见问答

Q: What is the difference between P144.R4 and P155.R2? / P144.R4和P155.R2有什么区别？

A: P144.R4 is mainly for drain, vent and small auxiliary steam loops; P155.R2 is designed for main boiler startup steam regulation.
P144.R4主打疏水、放汽、小流量辅助蒸汽回路；P155.R2多用于锅炉主启动蒸汽调压。

Q: Can it be fitted with Emerson digital valve positioner? / 是否支持艾默生数字定位器？

A: Yes, it supports Emerson DVC series digital positioners with full diagnostic capability.
支持配套艾默生DVC系列数字定位器，可实现阀门在线诊断功能。