Knowledge of forged steel globe valve

Knowledge of forged steel globe valve

Forged steel globe valve usually has only one sealing surface on the valve body and valve flap, so the manufacturing process is better and easier to maintain.

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The most obvious advantages of forged steel globe valves are

In the opening and closing process, because the friction between the valve flap and the sealing surface of the valve body is smaller than that of the gate valve, and therefore wear-resistant. The opening height is generally only 1/4 of the diameter of the valve seat channel, so it is much smaller than the gate valve. Forged steel globe valve usually has only one sealing surface on the valve body and valve flap, so the manufacturing process is better and easier to maintain.

Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K Nominal diameter or caliber: DN10 ~ 500, NPS 1/2 ~ 36" Connection: flange, butt welding, threaded, etc. Applicable temperature: -196 ℃ ~ 700 ℃ Drive: manual, bevel gear drive, pneumatic, electric, hydraulic, gas-hydraulic Linkage, electro-hydraulic linkage valve Body materialls: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8(304), CF3(304L), CF8M(316), CF3M(316L), Ti.

Choose different materials, can be applied to a variety of media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc. respectively.

Forged steel globe valve fluid resistance, applicable pressure, temperature range, media flow direction is not restricted, good sealing performance.

Forged steel globe valve stem axis and seat sealing surface perpendicular. Stem opening or closing stroke is relatively short, and has a very reliable cut-off action, making t****s valve is very suitable for use as a medium cut-off or regulation and throttling.

(1), installation location, height, import and export direction must meet the design requirements, the connection should be solid and tight.

(2), all types of manual valves installed in the insulation pipeline, the handle shall not be down.

(3), the valve must be installed before the appearance of inspection, the valve nameplate should comply with the current national standard "General Valve Marking" GB provisions. For working pressure greater than 1.0 MPa and in the main pipe to play a cutting role in the valve, the strength and tightness test should be conducted before installation, after passing before use. Strength test, the test pressure for the nominal pressure of 1.5 times the duration of not less than 5min, the valve shell, packing should be no leakage for qualified. Tightness test, the test pressure is 1.1 times the nominal pressure; test pressure in the test duration should be in line with the GB standard requirements, to the valve sealing surface no leakage as qualified.

Forged steel globe valve stem axis and seat sealing surface perpendicular. Stem opening or closing stroke is relatively short, and has a very reliable cut-off action, making t****s valve is very suitable for use as a medium cut-off or regulation and throttling.

Forged steel globe valve once the valve flap is in the open condition, it is no longer in contact between the valve seat and flap sealing surface, and has a very reliable cut-off action, making t****s valve is very suitable for cutting off or regulating the medium and throttling use.

Forged steel globe valve once in the open state, it is no longer in contact between the seat and valve sealing surface, so its sealing surface mechanical wear is small, as most of the globe valve seat and valve valve is relatively easy to repair or replace the sealing element without removing the entire valve from the pipeline, w****ch is very suitable for the valve and the pipeline welded into one occasion. The flow direction of the medium through such valves changes, so the flow resistance of the shut-off valve is ****gher than other valves.

When comparing forged vs cast valves, forged steel valves typically offer greater strength, reliability, and durability under extreme pressure and temperature. On the other hand, cast steel valves are ideal for complex shapes and cost-sensitive applications. Choosing between them depends on your project’s performance needs and design requirements.

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This article breaks down the key differences between forged and cast valves, covering their manufacturing processes, pros and cons, and best-use scenarios. If you’re trying to decide between a forged valve body and a cast one, we’ve got you covered with everything you need to know.

What Are Forged and Cast Steel Valves?

What Is a Forged Steel Valve?

A forged steel valve is made by shaping solid metal using compressive forces under high heat. This technique aligns and refines the grain structure of the metal, increasing its strength and toughness. The result is a forged valve with excellent mechanical properties and minimal internal defects.

Key Takeaways:

• Forged valves are made from solid metal using heat and pressure.
• They are stronger and more reliable in high-pressure environments.
• Commonly used for critical, high-performance applications.

What Is a Cast Steel Valve?

Cast steel valves are made by melting metal into liquid form and pouring it into a mold. Once the metal cools and solidifies, the valve body is removed and machined into shape. This process enables the creation of valve castings with intricate geometries and lower production costs.

Key Takeaways:

• Casting or pouring molten metal into molds forms complex valve shapes.
• Ideal for low-to-moderate pressure applications.
• Easier and more cost-effective to produce at scale.

Both options add value to industrial operations but in different ways. To understand which is better for your needs, let’s explore their core differences.

Forged vs Cast Valves: A Comparison

1. Manufacturing Process

• Forged Valves

The process starts with raw solid metals (known as “forgings for valve components”) heated until they’re malleable. Then, industrial tools shape them using compressive forces. Techniques such as open-die forging or closed-die forging are used to achieve the desired structure. This method refines the grain structure and enhances metal density.

• Cast Valves

Valve casting involves heating metals to a molten state and pouring the liquid into molds. Once solidified, the valve is removed, cleaned up, and polished for use. Sand casting and investment casting are popular forms of this process. Casting allows the creation of intricate designs and larger valve bodies.

2. Advantages

Forged Valves Advantages:

• Strength and Durability: The forging process enhances material strength, making forged valve bodies resistant to high pressure and temperature stresses.
• Less Wastage: Since molded from a single solid mass, forged valves produce minimal material waste.
• Precision Engineering: With a consistent grain structure, they maintain an excellent seal and ensure leak-proof performance.
• Lightweight Walls: Thinner walls mean reduced thermal fatigue and faster cooling and heating.

Cast Valves Advantages:

• Cost-Efficiency: Casting requires less effort and is budget-friendly, particularly for mass production.
• Design Flexibility: Cast valves can accommodate unique shapes, patterns, and sizes that forging cannot achieve.
• Material Variety: Casting supports a broader range of alloys, meaning more metal options for specific applications.
• Simpler Repairs: Quick and cost-effective valve replacements are possible due to lower production complexity.

3. Disadvantages

Forged Valves Disadvantages:

• Higher Cost: Forging is labor-intensive and requires specific tools, which makes it pricier compared to casting.
• Limited Intricate Designs: Because materials are worked in their solid forms, creating complex shapes is challenging.

Cast Valves Disadvantages:

• Weaker Material: Cast valves lack the same structural integrity as forged valves; they’re more prone to porosity, cracks, or shrinkage.
• Thicker Walls Needed: To achieve strength, cast valves often need heavier walls. This can introduce stress and heat fatigue during operations.
• Higher Risk of Defects: Gas voids or cavities can form during the casting or solidification process.

4. Applications

When to Use Forged Valves:

Forged steel valves are better for high-stress, high-temperature, and high-pressure environments. Industries that rely on forged valve components include:

• Oil and Gas: Pipelines, refineries, and high-pressure wells.
• Power Plants: Steam and nuclear systems where heat levels are extreme.
• Aerospace and Defense: Applications that demand robust valves capable of resisting stress and fatigue.

When to Use Cast Valves:

Cast valves excel in low to moderate-pressure systems, where design flexibility is key. Typical applications include:

• Water Systems: Water treatment plants need corrosion-resistant designs.
• Chemical Plants: Intricate geometries to manage chemical flow and purification.
• HVAC Systems: Efficiency-focused heating and cooling systems in buildings.

Why is Forged Steel Better Than Cast?

This is a common question with a straightforward answer. Forged steel is better than cast steel when the operational demands involve handling extreme pressures and temperatures. Its superior strength, low levels of porosity, and ability to resist wear make it the ideal choice for high-stakes environments.

However, if cost and complex design are priorities, cast steel valves may still be your better option. It always depends on what you need the valve to do.

Key Differences at a Glance

Summary: Forged vs Cast Valves—Which Is Better?

So, why is forged steel better than cast in many industrial applications? Forged steel valves offer unmatched structural integrity and pressure performance, especially in high-stress systems. Their dense grain structure, low defect rate, and fatigue resistance make them the preferred choice for mission-critical operations.

However, that doesn’t mean cast valves don’t have their place. For standard systems, complex designs, or cost-sensitive projects, casting or investment-cast components can deliver excellent results.

At PANS VALVE, we offer a full range of forged valve options engineered for performance, durability, and compliance with global standards.

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