What is China Cast Steel Gate Valve and Why Do We Use Them?

The Advantages and Disadvantages of Cast Steel Gate Valves

The China Cast Steel Gate Valve is a type of valve that's widely used across multiple industries due to its specific design and performance benefits. Discover more about its distinct features and why it remains a popular choice in various applications.

Cast Steel Gate Valve Design Features

Typically, conventional valves tend to leak or rust over extensive usage periods. To counteract these issues, the manufacturing process of cast steel gate valves incorporates advanced rubber and elastic seat sealing technologies. These enhancements address typical failures in gate sealing and rust, ensuring durability and reliability. The valve seat, designed with an elastic disc, compensates through elastic deformation, resulting in efficient sealing. Thus, the valve is easy to operate, guarantees a reliable seal, and has a long service life. This adaptability allows its usage in industries such as water supply, sewage, construction, petroleum, chemicals, food and beverage, pharmaceuticals, textiles, electricity, marine, metallurgy, and energy systems.

The Advantages of Cast Steel Gate Valve

• Low fluid resistance
• Effortless opening and closing mechanisms
• No flow direction limitations; flow remains undisturbed and pressure stays constant
• Simple design, short structure, efficient manufacturing process, and widespread applicability

The Disadvantages of Cast Steel Gate Valve

• Susceptible to sealing surface erosion and wear, making maintenance challenging
• Requires ample space due to large external dimensions for opening and closing
• Complex structure

Gate valves can be classified based on the configuration of the sealing surface. There are wedge gate valves, which include single gate, double gate, and flexible gate types, and parallel gate valves, divided into single gate and double gate types. Depending on the stem thread position, they are categorized as rising stem gate valves and non-rising stem gate valves.

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Cast Steel Gate Valve vs Stainless Steel Gate Valve

The assumption that a "cast steel gate valve is a gate valve made of stainless steel" is misleading. It’s a narrow interpretation based on terminology. In reality, significant differences exist between the two. Cast steel gate valves encompass all gate valves crafted from metallic steel materials cast into forms. Hence, such valves, whether made from carbon steel, stainless steel, low alloy steel, etc., fall under cast steel gate valves. On the other hand, stainless steel gate valves alone are valves made from stainless steel, which can be either cast or forged.

It's elucidated that cast steel gate valves and stainless steel gate valves vary in aspects such as material and manufacturing process. Cast steel gate valves might be crafted from stainless steel, carbon steel, or alloy steel, unlike stainless steel gate valves that are exclusively stainless.

Each cast steel gate valve corresponds to specific grades of steel marked on the valve body. Common grades include:

1. Carbon steel: WCA, WCB, WCC, LCB, suitable for temperatures -46°C to 425°C
2. Stainless steel: 301 stainless steel, CF8 (304 stainless), CF8M (316 stainless), suitable for -198°C to 816°C

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High-temperature alloy steel, often known as chromium-molybdenum steel, falls under low-alloy steel. Chosen grades include ZG1Cr5Mo, ZG15Cr1MoV, ZG20CrMoV, and more, suitable for temperatures 550°C to 750°C. The specific operational conditions dictate the preferred material grade. When distinguishing between cast and forged steel gate valves, material grades offer clear differentiation. Cast steel valves are typically marked CF3 or CF8 for stainless steel castings, while forged equivalents might be marked directly as 304. The selection between cast steel and forged steel gate valves hinges on the medium conditions, caliber, and pressure requirements.

TH Valve is renowned for manufacturing a diverse range of valves, including butterfly, gate, check, globe, knife gate, and ball valves, adhering to standards like API, JIS, and DIN. Their products are utilized in industries like oil, gas, marine, water supply, fire fighting, and more.

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