When the valve of the valve component of the pump valve is corroded, this time it is necessary to pay attention to the place where the metal surface treatment valve is connected. For the valve connection bolt in the valve component of the valve, zinc plating, chrome plating, and oxidation (blue) are commonly used. ) Treatment can improve the resistance to atmospheric and media corrosion. In addition to other fasteners used in the above methods, it should be treated according to the situation, such as phosphating.
When the valve of the pump valve fitting is corroded, if it is a sealing surface or a closed part with a small diameter, the surface process such as nitriding, boronizing, etc. is often used, which can also improve its corrosion resistance. With wear resistance, the valve disc made of 38CrMoAlA, nitrided layer ≥ 0.4mm.
When the valve of the pump valve fitting is corroded, if the valve stem is anti-corrosion, the surface treatment process such as nitriding, boronizing, chrome plating, and nickel plating will be used more widely. In this way, the corrosion resistance of the valve can be improved. , Corrosion resistance and abrasion resistance.
After that, we actually need to pay attention to the fact that when the valves of the pump and valve fittings are subjected to different surface treatments, they should be suitable for different valve stem materials and working environments. The valve stems that contact the atmosphere, steam media and asbestos fillers, At this time, hard chrome plating and gas nitridation processes should be used (stainless steel should not use ion nitriding process); the valve in the hydrogen sulphide atmosphere environment will use electroplated high-phosphorus nickel plating to have better protection performance; 38CrMoAlA uses ion and Gas nitriding can also be corrosion resistant, but hard chrome plating is not suitable.
For the valve treatment of the valve parts of the pump, it is resistant to ammonia corrosion after quenching and tempering of 2Cr13, carbon steel with gas nitriding also can resist the corrosion of ammonia, and is not resistant to ammonia corrosion for all phosphorus nickel plating; after gas nitrogen The 38CrMoAlA material has very good corrosion resistance and comprehensive properties, and it uses it to produce heavy valve stems for pump valves. For small-diameter bodies and handwheels, chrome plating is often used to improve their corrosion resistance and decorate the valve.http://www.pump-casting.com/