1. The valve body shall be made of nodular cast iron, cast steel, stainless steel and 316L, and the brand and physical and chemical test data of cast iron shall be indicated.
2. The material of valve rod shall be stainless steel valve rod (2CR13) as much as possible. Large-diameter valves shall also be stainless steel embedded valve rod.
3. The nut is made of cast aluminum brass or cast aluminum bronze, and its hardness and strength are greater than the valve rod.
4. The hardness and strength of the valve rod bushing shall not be greater than that of the valve rod, and it shall not form electrochemical corrosion with the valve rod and valve body under the condition of water immersion.
5. Material of sealing surface
① The types of resilient seat sealing gate valves are different, and the requirements for sealing methods and materials are different;
② The material, fixing method and grinding method of common wedge gate valve and copper ring shall be described;
③ Physical, chemical and sanitary test data of rubber lining materials of resilient seat sealing gate valve and valve plate;
6. Valve shaft packing
① Because the resilient seat seal gate valve in the pipe network is usually opened and closed infrequently, the packing is required to be inactive for several years, and the packing is not aging, and the sealing effect is maintained for a long time;
② The valve shaft packing shall also bear the good sealing effect during frequent opening and closing;
③ In view of the above requirements, the valve shaft packing shall not be replaced for life or more than ten years;
④ If the packing needs to be replaced, the pneumatic valve design should consider the measures to replace it under the condition of water pressure

Fengbao valve factory is an entity factory with professional production experience and professional manufacturing technology. The company adheres to the business philosophy of "customer-oriented, quality-oriented, attentive service", integrates all kinds of professional advantage resources, and creates cost- effective products. The company has an excellent R & D team, dedicated to creating trustworthy products. Seek new development and create new brand.

The core team has gathered professionals with experience in product R & D, production and operation. The company attaches great importance to the growth of its employees while growing up, and has long been committed to the cohesion and improvement of their sense of responsibility, technical level and professional knowledge. The company provides development opportunities and platforms for every excellent employee, provides standardized system training and promotion mechanism, and helps employees to improve and grow in their own work field.

The company's products are mainly featured by appropriate price, excellent quality and high cost performance. Company independent research and development, production, unique production, in order to achieve the first- class quality, and favored by the majority of customers!