P155.R2

Emerson P155.R2为艾默生Sempell系列高压低噪音蒸汽减压阀，采用多级节流阀内件结构，专门针对电站锅炉启动蒸汽与工艺蒸汽调压工况开发，适配高温高压蒸汽管线。

Emerson P155.R2 is a Sempell high-pressure low-noise steam reducing valve with multi-stage throttling trim, built for boiler startup and process steam regulation on high-temperature high-pressure steam piping.

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配备压力密封阀盖、可紧固纯石墨填料函、压力平衡阀芯，阀座与导向部位堆焊硬化处理，标准对接焊连接方式，可搭配各类电动、气动执行机构，是火电蒸汽系统核心调节阀备件。

It features pressure seal bonnet, retightenable graphite packing and pressure balanced plug with hardfaced seating. Butt-weld ends as standard, compatible with all common electric and pneumatic actuator types for thermal steam loops.

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Main Specifications 技术参数

1. Product Series / 产品系列：Emerson Sempell High Pressure Steam Valve Series
2. Part Numbers / 型号编码：P155.R2
3. Function Type / 类型：Low Noise High Pressure Steam Reducing Valve 低噪高压蒸汽减压阀
4. Key Features / 特性：Multi-stage trim, pressure seal bonnet, butt weld ends, graphite packing
5. Compatibility / 配套：Electric / Pneumatic Actuators, Power Boiler Steam Loop

Core Functions 核心功能

1. 多级阀内件逐级降压，降低蒸汽节流噪音，抑制气蚀与冲蚀损伤。
Multi-stage trim reduces pressure step by step, cutting steam noise and resisting erosion/cavitation.
2. 压力平衡阀芯设计，降低执行机构推力需求，调压稳定灵敏。
Pressure balanced plug reduces actuator force requirement for stable and responsive pressure regulation.
3. 压力密封阀盖结构，在高温高压工况下实现可靠密封，减少外漏风险。
Pressure seal bonnet maintains tight sealing under extreme high temperature and pressure steam conditions.
4. 纯石墨填料函，可现场重新紧固，长期运行维护量低。
Pure graphite packing gland, retightenable on-site for low maintenance in continuous operation.
5. 预热、排水螺柱接口，适配锅炉启停工况，保护阀内件免受热冲击。
Pre-warming and drain studs mitigate thermal shock during boiler start and stop cycles.

Application Scenarios 应用场景

1. 火电厂锅炉启动蒸汽回路原有Sempell减压阀更换。
Replacement of failed Sempell reducing valves on boiler startup steam circuits in thermal power plants.
2. 电站工艺蒸汽管网压力连续调节、稳压控制。
Continuous pressure regulation and stabilization for power plant process steam distribution networks.
3. 燃气-蒸汽联合循环机组高温高压蒸汽管路改造维保。
Retrofit and maintenance for high-pressure steam piping in combined cycle power units.
4. 化工、炼化自备电站高压蒸汽系统备件储备。
Spare inventory for high-pressure steam systems of chemical and refinery captive power stations.
5. 阀门备件出口，含水压试验、密封性检测、执行机构联调。
Overseas valve spare supply with hydrostatic test, leak tightness inspection and actuator commissioning.

FAQ 常见问答

Q: What is the difference between P155.R2 and standard Model 155? / P155.R2和标准155型有什么区别？

A: P155.R2 is a revised variant of Sempell Model 155 with optimized trim and material specification for specific boiler startup service.
P155.R2属于Sempell 155系列改版型号，阀内件和材质规格针对锅炉启动工况优化。

Q: What connection form does this valve adopt? / 阀门采用什么连接形式？

A: Standard butt weld ends complying with ASME B16.25 for high pressure steam piping.
标准对接焊连接，符合ASME B16.25规范，适配高压蒸汽管道焊接安装。