Large diameter stainless steel butterfly valve electric fluorine lined switch valve Faden

Large caliber electric stainless steel butterfly valve Shandong electric fluorine lined switch valveIt is an execution device that uses electric energy as the driving force to drive valves. With its advantages of small size, light weight, reliable performance, and simple matching, it is widely used in industries such as food, environmental protection, light industry, petroleum, and chemical. The widely used method for wastewater biological treatment is aerobic biological treatment, which is traditionally divided into two categories: activated sludge method and biofilm method. The activated sludge process itself is a treatment unit with multiple operating modes.

Corrosion and Protection of Valve Stem

The main cause of valve stem corrosion is that the corrosion damage to the valve body is mainly caused by corrosive media, while the main problem of valve stem corrosion is the packing. Not only does the corrosive medium corrode and damage the valve stem, but steam and water can also cause spots at the contact between the valve stem and the packing. Especially for valves stored in warehouses, valve stem point corrosion can also occur. This is the electrochemical corrosion of the valve stem by the packing. The most commonly used filler nowadays is the packing based on asbestos, which contains a certain amount of chloride ions, as well as potassium, sodium, and magnesium ions, all of which are corrosive factors.

Precautions for valve stem corrosion prevention: Do not add packing during valve storage. Without packing, the electrochemical corrosion factor of the valve stem is lost, and it can be stored for a long time without being corroded. Surface treatment of valve stem. Such as chrome plating, nickel plating, nitriding, boronizing, zinc doping, etc. Reduce asbestos impurities. The method of washing with distilled water can reduce the chlorine content in asbestos, thereby reducing its corrosiveness. Add corrosion inhibitor to asbestos packing. This corrosion inhibitor can inhibit the corrosiveness of chloride ions. Add sacrificial metal to asbestos. This is a sacrifice made of a metal with a lower potential than the valve stem. In this way, the corrosion of chloride ions first occurs on the sacrificial metal, thereby protecting the valve stem. Zinc powder can be used as a sacrificial metal. Using polytetrafluoroethylene protection. Polytetrafluoroethylene has excellent chemical stability and dielectric properties, and current cannot pass through. If asbestos packing is impregnated with polytetrafluoroethylene, corrosion will be reduced. Alternatively, asbestos packing can be wrapped with PTFE tape and then packed into a stuffing box. Improving machining smoothness can also reduce electrochemical corrosion.

Our company'sLarge caliber electric stainless steel butterfly valve Shandong electric fluorine lined switch valveEffectively addressed the issue of valve stem corrosion.

• 【 Diameter 】: DN40-1200

• : PN10 PN16 PN25

• Suitable for flanges: PN10-PN16

• Sealing material and working temperature:

• EPDM: -35~+135 ℃

• Nitrile rubber NBR: -25~+90 ℃

• Polytetrafluoroethylene PTFE: -40~+200 ℃

• Fluororubber FPM: -29~+205 ℃

• Valve body material: aluminum alloy, ductile iron, carbon steel, stainless steel

• [Valve Plate Material]: Nylon coated ductile iron, electroplated ductile iron, stainless steel, aluminum bronze

• 【 Connection Method 】: Clamp, Multi hole Clamp, Flange, Single Flange, Double Flange

Characteristics of wastewater treatment technology

⑴ Fast reaction rate, generally industrial wastewater only takes half an hour to several hours;

⑵ Organic pollutants have a wide range of functions, such as difficult to remove and degrade organic substances containing even fluorine, carbon double bonds, nitro groups, and halogenated structures, which have good degradation effects;

⑶ The process flow is simple, the service life is long, the investment cost is low, the operation and maintenance are convenient, the operating cost is low, and the treatment effect is stable. Only a small amount of microelectrolyte filler is consumed during the processing. The filler only needs to be added regularly without replacement, and can be directly added when adding.

After microelectrolysis treatment, wastewater will form original ferrous or iron ions in the water, which have better coagulation effect than ordinary coagulants. There is no need to add coagulants such as iron salts, and the COD removal rate is high, without causing secondary pollution to the water;

⑸ It has good coagulation effect, high color and COD removal rates, and can greatly improve the biodegradability of wastewater with the same amount.

This method can achieve the effect of chemical precipitation for phosphorus removal and can also remove heavy metals through reduction;

For high concentration organic wastewater treatment projects that have been built but have not yet met the standards, using this technology as a pre-treatment for the wastewater of the existing projects can ensure stable and compliant discharge after wastewater treatment. Alternatively, the high concentration portion of the production wastewater can be separately extracted for microelectrolysis treatment. [3]

Each unit of this technology can be used as a separate treatment method or as a pre-treatment process for biological treatment, which is beneficial for sludge settling and biofilm formation.