Product Name: Customized Coated Sand Process Ductile Iron Green Molding Valve Body Sand Casting Certification: CE Standard: Customize Surface Roughness: Ra12.5 Surface Treatment: Sand Blast Material: Iron Machining: Pump Application: Hardware Sand Core Type: Resin Sand Core Casting Method: Directional Crystallization Type: Clay Wet Sand Size: Customerized Transport Package: Wooden Packing Specification: cast iron Origin: China Product Description The valve body is made of a wide variety of materials, suitable for various working conditions. Henan Chemical Machinery Manufacturing Co., Ltd. focuses on large castings. We can also cast large valve body castings, using resin sand production technology.Commonly used materials for valve bodies are:Gray cast iron, suitable for low pressure valves with working temperature between -15 and +200ºC and nominal pressure PN≤1.6MPa. Heat treatment of gray cast iron. In order to achieve different purposes, gray cast iron can undergo different heat treatments after casting. In the valve production, the heat treatment processes that are often used for gray cast iron valve bodies and other parts after casting include: heat aging to eliminate casting stress and high temperature annealing to eliminate free cementite. Thermal aging is a necessary process. High-temperature annealing is only used to replace thermal aging when there is primary cementite in the structure after casting due to improper control of the chemical composition and casting cooling rate during casting.