电厂除灰与煤化工水煤浆系统中，灰水、黑水、渣水等高速含硬颗粒介质，对阀内件产生强烈冲击。普通阀门可能很快磨穿，频繁更换不仅昂贵，还造成非计划停机。山东龙飞以表面硬化技术提供耐磨阀门方案。
三种硬化技术
- PTA等离子堆焊：在金属表面熔覆硬质合金，形成牢固结合。
- HVOF超音速火焰喷涂：致密高硬度涂层抵御大颗粒冲刷。
- WC粉末冶金烧结：整体烧结碳化钨内件应对严重磨损。
恶劣工况偏心旋转阀
阀腔采用HVOF或等离子堆焊，阀芯阀座可选整体WC；CFD设计流线型通道，降低直接冲刷；支持60°及90°转角，适应大口径高磨损应用。
文丘里耐磨角阀
文丘里阀体配导套刮刀减少阀杆积垢凝结；大推力执行机构应对粘稠浆料阻力；快拆结构缩短维修时间。
技术范围
温度−45°C至560°C，含高温散热型；最高压力可选ANSI Class 900或PN100；泄漏等级V。以上为不同配置的范围，不代表全部条件可任意组合。
用HVOF与整体WC等技术应对磨损，目标是提高密封稳定性、延长寿命并减少维护成本。
产品规格表
| 参数 | 原文范围 |
|---|
| 温度 | −45°C to 560°C, including the high-temperature heat-dissipating configuration |
| 压力等级 | Up to ANSI Class 900 / PN100, according to configuration |
| 泄漏等级 | V |
In power-plant ash-handling systems and coal-chemical slurry processes, valves face severe wear and erosion. Grey water, black water, coal-water slurry and slag water contain hard particles moving at high speed, striking the internal components with considerable force. Conventional valves can wear through rapidly, causing leakage, repeated replacement and unplanned shutdowns.
Shandong Longfei’s wear-resistant valve range uses surface-hardening technology to address these severe duties.
1. Surface-hardening technologies
The solution includes material engineering as well as valve construction. Three principal treatments are selected according to the degree of wear:
- PTA plasma overlay welding: a hard-alloy layer is fused onto the metal surface to provide a strong metallurgical bond.
- HVOF high-velocity oxy-fuel spraying: a dense, hard coating resists erosion from large particles.
- Tungsten-carbide powder metallurgy: solid sintered WC internal components are used for particularly severe wear.
2. Valves for severe service
Wear-resistant eccentric rotary valve
- Erosion resistance: HVOF spraying or plasma overlay protects the internal cavity; solid sintered WC plugs and seats are available.
- Flow optimization: CFD-informed streamlined passages reduce direct impingement on the body.
- Application flexibility: 60° and 90° rotation options suit large-diameter and highly abrasive duties.
Venturi wear-resistant angle valve
- Slurry handling: a Venturi body and guide-sleeve scraper arrangement help prevent buildup and solidification on the stem.
- High-thrust actuation: an actuator with sufficient thrust is specified for viscous slurry and high operating resistance.
- Quick-disassembly construction: maintenance access reduces repair time.
3. Published operating envelope
| Parameter | Range stated in the article |
|---|
| Temperature | −45°C to 560°C, including the high-temperature heat-dissipating configuration |
| Pressure rating | Up to ANSI Class 900 / PN100, according to configuration |
| Leakage class | V |
The article presents these as the available range across the severe-service solutions, rather than a single configuration suitable for every combination.
Durability in abrasive service
Repeatedly accepting wear carries a cost. HVOF coatings and solid sintered WC trim are intended to help maintain reliable sealing and extend service life in demanding industrial applications.
