1. The lubrication of air pressure chamber can be omitted, and it adopts patented air valve, with excellent abrasion resistance. 2. Air pressure is anodized, and covered by epoxy coating, with good corrosion, and suitable for high pollution situation. 3. All parts can be replaced in the situation of not opening the liquid chamber. 4. The material of central axis is stainless steel, with good anti-corrosion. 5. The material of aluminum is anodized. 6. Low pressure, slowdown and no getting stuck. 7. Special material of valve ball, with perfect craft, and good self- priming ability. 8. The service life of diaphragm is 1 /3-1 /2 higher than other manufacturer. 9. One reversing valve is suitable for pumps with a variety of specification and easy to maintenance and replace. 10. The side discharge can avoid the corrosion of air valve caused by liquid drop. 1. Chemical industry: acid, alkali, solvent, sewage resin, latex, filter press, mixture. 2. Petrochemical industry: crude oil, heavy oil, grease, mud, sludge and so on. 3. Coating industry: resin, solvent, coloring agent, paint, coloring agent, alkyd resin. 4. Chemical industry: detergent, shampoo, lotion, emulsion, hand cream, surfactant 5. Ceramic industry: mud, clay, lime slurry, clay pulp. 6. Mining industry: coal slurry, magma, mud, mortar, explosive pulp, lubricants and so on. 7. Water treatment: lime slurry, soft precipitates, sewage, chemicals, wastewater. 8. Food industry: liquid semi-solid, chocolate, saltwater, vinegar, syrup, vegetable oil, soybean oil, honey, animal blood. 9. Beverage industry: yeast, syrup, concentrate, gas-liquid mixture, wine, fruit juice, corn steep liquor and so on. 10. Pharmaceutical industry: solvent, acid, alkali, plant refining oil, ointment, plasma and other pharmaceutical materials liquid. 11. Paper industry: adhesives, resins, paints, inks, pigments, hydrogen peroxide and so on 12. Electronic industry: solvent, plating solution, cleaning solution, sulfuric acid, nitric acid, waste acid, corrosive acid, acetone, polishing liquid 13. Textile industry: dye chemicals, resins, plastics and so on 14. Construction: cement slurry, ceramic tile adhesive, rock pulp, ceiling finish and so on 15. Automotive: Polishing emulsion, oil, coolant, car primer, oil emulsion, varnish, varnish additives, degreasing solution, paint, etc. 16. Furniture industry: adhesives, varnishes, dispersions, solvents, paints, white wood, epoxy, starch, etc. 17. Metallurgy, casting and dyeing industry: metal pulp, hydroxide and carbide pulp, dust, detergent, etc.