Casting valve is cast into the valve, the general casting valve pressure grade is relatively low (such as PN16, PN25, PN40, but there are also high pressure, can be 1500Lb, 2500Lb), caliber most are more than DN50. Forged valve is forged out, generally used in high grade pipeline, caliber is relatively small, generally below DN50.

First, casting valve
1, casting: is to melt the metal into a liquid that meets certain requirements and cast into the mold, after cooling and solidification, cleaning treatment to get a predetermined shape, size and performance of the casting (parts or blank) process. Basic technology of modern machinery manufacturing industry.

2, casting production of low cost, for complex shape, especially with complex cavity parts, more can show its economy; At the same time, it has wider adaptability and better comprehensive mechanical properties.

3, but casting production required materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as metallurgical furnace, sand mixing machine, molding machine, core making machine, sand falling machine, shot blasting machine, cast iron plate, etc.) more, and will produce dust, harmful gas and noise and pollution of the environment.

4, casting is an early human grasp of a metal hot processing process, the development of casting speed is very fast, has developed nodular cast iron, malleable cast iron, ultra-low carbon stainless steel and aluminum copper, aluminum silicon, aluminum magnesium alloy, titanium, nickel base alloy and other casting metal materials, and a new process for gray cast iron breeding treatment. After 50′s, there appeared wet sand high pressure modeling, chemical hardening sand modeling and core making, negative pressure modeling and other special casting, shot blasting cleaning and other new technologies.

5, there are many kinds of casting, according to the modeling method is customarily divided into: (1) ordinary sand casting, including wet sand, dry sand and chemical hardening sand type 3. ② Special casting, Press molding materials and can be divided into natural mineral sand as the main special casting molding materials (e.g., investment casting, mold casting, shell mold casting foundry, negative pressure casting, mold casting, ceramic mold casting, etc.) and metal as the main mold material of special casting (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.).

6, casting process usually includes: (1) cast (containers) makes liquid metal solid casting, casting according to the materials can be divided into sand mold, metal, ceramic, mud, graphite, etc., can be divided by use disposable, semi permanent and permanent type, mold preparation quality are the main factors influencing the casting quality; (2) the melting and casting of casting metal, casting metal (casting alloy) are mainly cast iron, cast steel and cast non-ferrous alloy; Casting treatment and inspection, casting treatment including the removal of core and casting surface foreign bodies, removal of pouring riser, shovel grinding burr and seam and other protrusions and heat treatment, plastic, rust treatment and rough processing. Inlet pump valve

Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.

Major products: Butterfly Valve, Ball Valve,Gate Valve, Check Valve, Globe Vavlve,Y-Strainers, Electric Acurator , Pneumatic Acurators .