化工、氧化铝和造纸介质中的高硬度颗粒持续磨损阀腔与密封面，可能造成密封失效、阀体穿孔及阀杆结疤卡死。ERPC偏心旋转阀将结构改进与耐磨材料相结合，为恶劣工况提供系统方案。
三道耐磨防线
阀体硬化
采用HVOF超音速火焰喷涂和等离子堆焊，形成致密、结合牢固的耐磨层，抵抗大颗粒硬质介质持续切削。
实体WC内件
阀芯、阀座采用实体碳化钨镶嵌并硬化内件。整个工作面保持高硬度，即使长期磨损，露出的仍为硬质材料，避免仅靠薄涂层保护。
CFD流道优化
模拟介质流向，减少直角台阶和死区，抑制湍流与涡流，降低冲击、气蚀及磨损。
四项结构改进
- 流线型硬化内腔：降低直接冲刷，延长壳体寿命。
- 上下轴支撑：增加流通面积，适应含纤维和颗粒介质。
- 双填料及上轴套密封：减少介质沿阀杆渗透结晶，防止卡涩。
- 双偏心：启闭时迅速脱离阀座，降低密封面摩擦和转矩，有利于使用较小执行机构。
参数
温度−29°C至450°C，压力PN10–PN100或ANSI Class 150/300/600；修正等百分比流量特性；碳钢或不锈钢阀体，不锈钢阀芯阀座，可按工况配置WC镶嵌。口径DN25–DN300，泄漏等级IV，法兰或对夹连接。
ERPC从抗冲刷到防结疤，以组合设计提升耐用性和控制精度。地址：济南市经十东路16888号C3北；官网：http://www.e-lonfly.com.cn；电话：0531-88263858 / 88013051。
产品规格表
| 参数 | 原文规格 |
|---|
| 型号 | ERPC eccentric rotary control valve |
| 标准 | GB/T 4213-2024, effective July 1, 2025; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| 口径 | DN25–DN300 |
| 压力等级 | PN10–PN100; ANSI Class 150/300/600 |
| 温度范围 | −29°C to 450°C |
| 泄漏等级 | IV |
| 阀体 | 碳钢或不锈钢 |
| 阀芯与阀座 | Stainless steel; WC inserts available for specified duties |
| 流量特性 | 修正等百分比 |
| 连接 | 法兰或对夹 |
| 执行机构与附件 | Electric actuator, piston cylinder, electropneumatic or smart positioner, filter regulator |
In chemical, alumina and paper production, hard particles in the process medium act like countless small files, wearing the valve cavity and sealing faces. Conventional control valves may suffer rapid seal failure, erosion through the body or deposits that seize the stem.
The E-LONG ERPC eccentric rotary valve combines structural improvements with wear-resistant materials to address these problems as a system.
1. Three layers of wear protection
Body hardening: HVOF spraying and plasma overlay
The body has a large area in contact with the medium. The ERPC uses high-velocity oxy-fuel (HVOF) spraying and plasma overlay welding rather than relying solely on shallow surface treatment. High-velocity deposition produces a dense, strongly bonded wear-resistant layer intended to resist continued cutting by large, hard particles.
Solid tungsten-carbide components
The plug and seat experience especially severe throttling erosion. Solid WC inserts and hardening of the internal components provide protection beyond simple nitriding. Tungsten carbide offers high hardness and wear resistance. Because the working surface is solid hard material, wear continues to expose hard material rather than an underlying softer substrate, helping preserve the sealing pair over its service life.
CFD-informed flow passages
Hard materials are combined with flow-path improvement. Computational fluid dynamics is used to model the medium and develop a streamlined cavity without abrupt internal steps or dead spaces. Smoother flow reduces turbulence, vortices and direct impact associated with cavitation and erosion.
2. Four structural features
- Streamlined, hardened cavity: precision machining and hardening reduce direct erosion and help extend body life.
- Top-and-bottom shaft support: a stable dual-shaft arrangement increases the available flow area compared with cantilever support. It improves capacity and resistance to plugging with fibrous or particle-laden media.
- Double packing glands: sealing at the upper shaft bushing, together with double packing, limits upward penetration and crystallization along the stem, reducing the risk of seizure.
- Double-eccentric geometry: the plug disengages from the seat at the start of rotation, reducing mechanical friction and operating torque. This can allow a smaller actuator and lower purchase cost.
3. Technical specifications
| Parameter | Published specification |
|---|
| Model | ERPC eccentric rotary control valve |
| Standards | GB/T 4213-2024, effective July 1, 2025; HG/T 20592/20615-2009; ANSI/ASME B16.5-2009 |
| Nominal size | DN25–DN300 |
| Pressure rating | PN10–PN100; ANSI Class 150/300/600 |
| Temperature range | −29°C to 450°C |
| Leakage class | IV |
| Body | Carbon steel or stainless steel |
| Plug and seat | Stainless steel; WC inserts available for specified duties |
| Flow characteristic | Modified equal percentage |
| Connections | Flanged or wafer |
| Actuation and accessories | Electric actuator, piston cylinder, electropneumatic or smart positioner, filter regulator |
The published operating range is intended to cover varied industrial fluids, from cooler media to steam and thermal oil. Material and trim configurations are selected to suit the actual shut-off and regulating requirements.
A complete severe-service solution
From erosion control in the cavity to deposit prevention around the shaft, the ERPC is intended as more than an isolated control component. E-LONG Yilong Fluid aims to provide durable and accurate fluid-control systems for difficult service.
Address: North side of Building C3, No. 16888 Jingshi East Road, Jinan. Website: http://www.e-lonfly.com.cn Telephone: 0531-88263858 / 88013051.
