1、 The core function of phosphorus removal valve

The phosphorus removal valve is a key executing component of the high-pressure water descaling system, mainly used to remove the oxide scale (primary and secondary oxide scales) on the surface of steel billets during the steel rolling process. Its core functions include:

1. Accurate control of high-pressure water flow: intermittent spraying of high-pressure water onto the surface of steel billets is achieved through rapid opening/closing.

2. Adapt to complex working conditions: It needs to withstand high pressure (usually 10-40MPa, or even higher), high temperature (the surface temperature of the steel billet can reach over 1000 ℃), and high-frequency actions (dozens of times per minute).

3. Ensure system stability: Collaborate with pump units, accumulators, nozzles, and other components to ensure uniform and efficient descaling effect.

2、 Typical Structure and Working Principle

Taking the 125EFC7PY-320-00 injection valve and the utility model phosphorus removal injection valve as examples, their working principles can be divided into the following steps:

1. High pressure water inlet (A port)

The high-pressure water at the pump outlet flows into the upper chamber of the main valve core through port A, and at this time, port B (outlet) is closed, and the high-pressure water is cut off.

2. Pilot hydraulic control device activated

Two four-way electromagnetic directional valves are powered on, and 5MPa high-pressure oil enters the upper chamber of the hydraulic cylinder, pushing the piston to move the valve stem downwards.

Pre filling stage: When the valve stem descends, high-pressure water from the upper chamber of the main valve core enters the lower chamber through a small valve port to pre fill the pipeline and avoid water hammer effect.

3. Main valve core open

The valve stem continues to descend, the main valve core is fully opened, and high-pressure water flows into the descaling collection pipe through port B, and then sprays onto the surface of the steel billet at a certain angle through the nozzle.

Spray stage: High pressure water achieves descaling through cooling effect (difference in shrinkage rate between steel billet and oxide scale), rupture effect (water jet impact force), and flushing effect (removal of detached oxide scale).

4. Close and reset

The electromagnetic directional valve loses power, the pressure in the upper chamber of the hydraulic cylinder is released, the valve stem resets under the action of spring force, the main valve core closes, and the injection stops.

3、 Key design optimization and performance improvement

1. Simplification of Structure and Enhancement of Reliability

Cancel the bracket and connecting block: for example, the utility model phosphorus removal spray valve is directly connected to the valve stem through the cylinder component, shortening the overall height and facilitating on-site maintenance; At the same time, ensure the concentricity of the valve stem, avoid long-term use and strain, and extend the service life.

Modular design: Some valves are integrated with pre filled water valve groups, high-pressure filters, and other components to reduce system complexity and improve response speed.

2、材料与密封技术

耐磨材料：阀芯、阀座采用硬质合金或激光熔覆技术，抗高压水冲刷和氧化铁皮磨损。

密封圈优化：在阀芯与阀座间设置耐高温、高压的密封圈，防止内漏，确保喷射压力稳定。

3、控制逻辑优化

预填充阀常开策略：通过预填充阀替代热保护阀，在非除鳞阶段保持少量水流循环，带走泵组热量，同时减少系统扬程损失，节能约10%-15%。

与PLC联动：根据热金属检测器（HMD）信号自动控制阀门启闭，实现间歇式除鳞，避免水资源浪费。

四、应用场景与效果

1、热轧生产线

粗轧机除鳞：在钢坯进入粗轧机前，除磷阀门配合高压水（压力20-30MPa）清除表面氧化铁皮，防止轧制过程中压入钢坯，降低表面缺陷率（如麻点、凹坑）。

精轧机前除鳞：在精轧前再次除鳞，确保带钢表面质量达高端产品要求（如汽车板、家电板）。

2、中厚板轧机

大压下量轧制：除磷阀门需承受更高压力（40MPa以上），配合旋转喷嘴实现全覆盖除鳞，避免边部氧化皮残留导致板形缺陷。

3、冷轧生产线

酸洗前预除鳞：在冷轧前用高压水（10-15MPa）清除热轧卷表面氧化铁皮，减少酸洗液消耗，降低生产成本。

五、技术发展趋势

1、高压化与大流量化

系统压力从20MPa提升至40MPa，流量从200L/s增至500L/s，单次喷射可覆盖更宽钢坯，提高生产效率。

2、智能化控制

集成压力传感器、流量计和位移传感器，实时监测阀门状态，通过AI算法优化喷射参数（如压力、频率、角度），实现自适应除鳞。

3、节能与环保

采用变频泵组和能量回收装置，降低能耗；优化喷嘴设计减少水雾飞溅，改善工作环境。