Only clear specifications, type, working pressure pneumatic valve when you meet the procurement requirements of the procurement practices in the current economic environment, the market is imperfect. Because under the pneumatic valve manufacturer for the product competitive Z641F pneumatic valve manufacturers, each pneumatic valve were unified design concept, with different innovations, formed their own corporate standards and product personality. Therefore, when the pneumatic valve procurement more detailed technical requirements, coordinating with manufacturers to reach a consensus, as an annex to the pneumatic valve procurement contracts is essential. 2.1 standard quality pneumatic valve pneumatic valve body material should be ductile iron, steel, stainless steel valves, Shandong, 316L-based, and indicate the grade and cast actual physical and chemical test data. 2.2 stem material, and strive to stainless steel stem (2CR13), large diameter valves should also be embedded in the package of stainless steel stem. 2.3 nut material, cast brass or aluminum bronze, and the hardness and strength are greater than the stem. 2.4 stem bushing material, its hardness and strength shall be not greater than the stem, and is immersed in water conditions and valve body is not the formation of electrochemical corrosion. Shandong Z641F pneumatic valve | pneumatic valve | Valve Model Everbright Everbright Limited provided by Shandong valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) strong, credible, Shandong Weifang ball industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Everbright valve into the brilliant and you work for a better future!