Introduction of glass fiber reinforced polypropylene diaphragm valves
Glass fiber reinforced polypropylene diaphragm valve is a kind valve designed to be effective that point to the chemical production industry medium to severe corrosion of equipment and pipe. It has high strength, corrosion resistance, long service life, low price and other advantages. Over the last decade it has been widely use in national chemical industry, metallurgy, light industry, food, chemical fiber, medicine, water and other industrial productions, giving enterprises a good economic. Such non-metallic materials valve products are now made as standardization of corrosion-resistant valve series products. In the last century, our country had imported petrochemical, chemical, chemical fiber and other projects complete set of equipments, and import such valves, called as polypropylene valves and then after examination by the research department analysis, including glass fiber packings as reinforced material of polypropylene, it is also known as reinforced polypropylene diaphragm valves on the market, commonly referred to as RPP Diaphragm Valves (Reinforced polypropy ene diaphragm Value). To solve the rectification of names, in 1994 Nonmetal Chemical Equipment National Standardization Technical Committee meeting to review the chemical industry standards, officially known as the "Glass-fiber Reinforced polypropylene diaphrag Valve", has been included as Chemical Industry standard of Ministry of Chemical Industry, the standard number is HG / T 2643-1994.
As the reinforced polypropylene material properties, when design, under working conditions applicable temperature range and valve diameter and the working pressure has a close relationship with each other, shown in table 2. It is resistant to general acids, alkalis, salts and derivatives products, such as hydrochloric acid, sulfuric acid, dilute nitric acid, phosphoric acid, carbonic acid, chromic acid, hydrofluoric acid and some organic acids, as well as ammonium, sodium, potassium, calcium, magnesium , iron, nickel salts. Due to various chemical variety, the concentration varies in the chemical equipment and piping system selection, except working pressure, the corrosion of working temperature and medium to the valve material should be the first consideration. In particular, the concentration of the chemical media and its applicable temperature range. The data would divide its temperature into 25,50,80,100 ℃, chemical corrosion resistance is divided into non-corrosive (using good), generally non-corrosive (can be used), a slight corrosion (as the case may use), corrosive (no use). The corrosive resistance illustration that supplied by producing this product manufacturer can be refered, you also can read authoritative "Corrosion Data Manual," --- polypropylene corrosion data, more detailed and comprehensive, makes a reasonable selection of the valve.
