Pros and Cons of Cast Valves

 

Pros and Cons of Forged Valves

There are many reasons why you may want a forged valve for your application instead of a cast valve. Forged valves do tend to be better for high temperature and high pressure applications. These types of valves are less prone to thermal fatigue because the walls are thinner compared to cast alternatives. Also, forged options have a higher mass, making them mechanically stronger. 

However, there are a few reasons why a forged valve may not be best for your application. First, the forging process does create limitations for valve size and shape. Forging generally works better for smaller valves and components. In addition, not every metal is suitable for forging, which limits your options for valve material. 

 

Pros and Cons of Cast Valves

Cast valves are a great option where you need quick turnaround and low cost valves, as they require less labor to produce. Also, the casting process allows for more complex shapes and valve manufacturing. You also have greater flexibility in material choice, as many types of metals are suitable for casting. 

While cast valves are quite strong and durable when you choose a high quality manufacturer, there are still some restrictions. For example, the solidification process can create small impurities in the metal. They also are less resistant to high temperatures and pressures compared to a forged ball valve. 

 

In comparison to castings, the structure of forgings ensures wall thickness and dimensional tolerances are uniform. High impact closed die press forces and a segregation free billet guarantees superior strength, uniformity, integrity and density. Casting issues include inter granular corrosion, stress weakness, fatigue, cracks, porosity, sand pockets, weld repairs, scars, etc. Another benefit of forgings is the directional flow lines structure.