The Difference between Forged Valve and Cast Valve

The Difference between Forged Valve and Cast Valve

Sep 02, 2020

Forged valves:
Forged valves are forged, which are generally used in high-grade pipelines. The diameter ratio is small, which is generally below DN50.

1. Forging:
It is a processing method that uses forging machinery to exert pressure on metal blank to produce plastic deformation to obtain forgings with certain mechanical properties, shapes and sizes.

2. The forging materials are mainly carbon steel and alloy steel with various compositions, followed by aluminum, magnesium, titanium, copper and their alloys. The original state of the material includes bar, ingot, metal powder and liquid metal. The ratio of metal cross section  before deformation to cross section after deformation is called forging ratio. Choosing correct forging ratio has a great relationship with improving product quality and reducing cost.

Cast valves:
Cast valves are valves made by casting. Generally, the pressure grades of cast valves are relatively low (such as PN16, PN25 and PN40, but there are also high pressures, which can reach 1500LB, 2500LB), and most of them have diameters above DN50.

1. Casting: refers to the technological process of melting metal into liquid meeting certain requirements, pouring it into a casting mold, cooling, solidifying and cleaning to obtain castings (parts or blanks) with predetermined shapes, sizes and properties. This is basic technology of modern machinery manufacturing industry.

2. The blank produced by casting has low cost. For parts with complex shape, especially with complex inner cavity, it can show its economy better; at the same time, it has wide adaptability and good comprehensive mechanical properties.

3. However, there are many materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as metallurgical furnace, sand mixer, molding machine, core making machine, sand dropping machine, shot blasting machine, cast iron plate, etc.) required for casting production, which will produce dust, harmful gas and noise that pollute the environment.



Next: The Characteristics of Forging Workshop—Part One

Previous: Risky Factors and Main Reasons of Forging Production


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Launched in 1988, Topper Forged Valve Company is engaged in manufacturing forged steel valves. Our products cover Forged Steel Ball Valve, Gate Valve, Check Valve, Globe Valve, According to API, BS, DIN, JIS GB Standards.
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