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/Forging vs Casting Valves
All valves are indispensable parts of any industrial system, but not all valves are created in the same way. For example, some valves are forged and other valves are cast. So what are the differences between forging vs casting valves and which type of valve is best for your specific application?
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Forging and casting are two of the most common ways to create high-quality valves. The biggest difference between forging vs casting valve methods is how they're carried out.
Forged valves are created using a forging method that involves shaping metals and alloys while they're in their solid form. Heat and industrial-size tools deliver compressive forces to bend the metals and alloys, and dies are used to cut and shape the materials to create specific valves. Forging can be performed in most temperatures depending on the metals used.
Forging valves presents many benefits for industrial companies. For example, companies don't have to worry about wasted materials. Since forged valves are shaped into one solid piece, little effort is needed to rework the material to achieve the proper shape and size.
Forged valves have a reputation for being strong, which make them ideal for handling high-pressure and high-temperature systems. During the forging process, the metal's grain structure becomes more refined. This leads to an increase in impact and overall strength. Also, forging boosts its resistance to common issues such as cracks, shrinkage, and porosity.
On top of that, forging can create valves with less wall thickness. This helps to reduce the likelihood of thermal fatigue during valve operation. This also means that forged valves can be heated and cooled more quickly, which allows them to adequately handle the stresses of systems that continuously cycle through start-up and phase-down processes.
Unlike forging, casting uses the liquid form of metal to create valves. These metals are melted into a molten liquid and poured into various molds. Once the liquid cools and solidifies, it's broken out of or ejected from the mold.
One of the biggest benefits of casting is that it can create valves with complex shapes, patterns, and sizes. Using a mold to manufacture these devices gives you more freedom to make different types valves with more intricate parts.
Casting valves are also a great cost-effective solution for many companies. It allows you to make valves using more types of metals and alloys. Plus, since it doesn't require as much labor as forging valves, casting helps to reduce machining costs, especially when creating valves of complex shapes.
Most importantly, casting valves provides an easier and less time-consuming way to make replacement parts when a system's current valves break down and deteriorate.
For more information about forging vs casting valves, contact CPV Manufacturing.
Cast Versus Forged Valves
Valves are indispensable parts of any industrial system, but they are not all made the same way. Of all the methods, the most popular for making high-quality industrial valves are casting and forging. Thus, it is common to have engineers and product designers deliberating on which of these two will be suitable for an application. In this article, we explore the advantages of each of them, as well as compare the features of cast versus forged valves.
The manufacturing of cast valves involves smelting metal and pouring it into a mold. Once it cools and solidifies, it is broken or ejected from the mold. Utilizing this method for valve manufacturing is beneficial in several ways including:
There are different methods of casting for valve production, but this section reviews the most common which are sand and investment casting.
Sand casting is the most common method of casting, especially for making steel valves. It entails fitting the molded design for the valve to the bottom of the sandboxes. Then boxes packed with sand are forcefully pushed into the molds, such that the mold leaves an impression on the sand.
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Subsequently, the boxes are flipped upside down to remove the molded designs. Next, two parts of the sandbox fit on top of each other and bolted together. As molten steel pours on top of the sandboxes, it seeps through the holes in the top of the bolted boxes, and the sandbox cools. After cooling, unbolting and removal of the sandboxes reveal the valve component. Surface finishing occurs to meet roughness requirements. Sand casting is ideal for making larger valve components but is a more expensive casting method.
Investment casting is the go-to method for producing smaller, more accurate valve components. It is also a more cost-effective method than sand casting. The process involves making a first mold using hard wax, lost wax, lost foam, or similar material. Then, dipping this wax mold in a thick layer of wet ceramic slurry. After curing, the wax melts, leaving the ceramic mold behind. Subsequently, the ceramic mold heats to about ' to remove any leftover wax or moisture, before the pouring of molten metal. Usually, this method can create valve parts weighing up to 100 kg and a maximum length of 1.6m.
Unlike cast valves, making forged valves entails shaping metals or alloys while in solid form. To achieve this, industrial tools provide compressive pressure to bend the material, while dies usually serve in shaping and cutting into specific valve components. When forging valves, it is necessary to exceed the elasticity limit of the material but not exceed its strength limit. Therefore, only ductile materials, which have these two limits sufficiently far apart, are suitable for this process. The benefits of manufacturing valves using this process include:
The methods of forging valves are classified either according to the temperature at which forging occurs or on the method used in shaping the components. Methods of forging in line with temperature requirements include:
As for classification according to the method of shaping, the methods include:
Making the choice between using cast versus forged valves depends on the application and several factors, which the following table highlights.
Parameter Cast Valves Forged Valves Strength and Durability The process of solidifying cast valves sometimes leads to impurities such as voids and cracks in the valve. This results in lesser mechanical properties, so this valve type is not ideal for high-pressure and high-temperature applications. The forging process aligns the metal's grain structure, thus producing a more resilient material. So, they are the go-to option for handling harsh chemicals, extreme temperatures, and high pressures without failing. Size and Versatility Effective in producing a variety of valve sizes and intricate shapes. Ideal for smaller valve sizes, generally below DN50. Can serve for larger sizes but will need to be developed in parts and connected by welding or flanges. This increases the risk of leakage. Cost and Production Labor costs are a lot less and valves can be manufactured in large batches, which is cost-effective. However, many materials and equipment are required for casting, and the process produces substances that can pollute the environment. The manufacture of forged valves is cost and energy intensive. Labor costs take up a huge chunk of the expenses as the valve parts undergo significant machining. In addition, they are made in smaller batches in comparison to cast valves. Surface Finish The forging process aligns the metal's grain structure, thus producing a more resilient material. So, they are the go-to option for handling harsh chemicals, extreme temperatures, and high pressures without failing. The forging process produces a more refined surface finish, so there is less need for extensive post-forging machining. Lead Time Cast valves are the preferable option when time is a critical factor. Although they have better performance, production time is longer. Cast Vs Forged Valves ComparisonContact us to discuss your requirements of stainless steel valve pump body casting factory. Our experienced sales team can help you identify the options that best suit your needs.