Forged steel gate valve advantages and disadvantages of forged steel gate valve

First, the advantages of forged steel gate valves.

1. Low fluid resistance.

2. The external force required for opening and closing is small.

3. The flow direction of the medium is not restricted.

4. When fully opened, the erosion of the sealing surface by the working medium is smaller than that of the globe valve.

5. The body shape is relatively simple, and the casting process is good.

Second, the shortcomings of forged steel gate valves.

1. The overall size and opening height are large. The installation requires a large amount of space.

2. In the process of opening and closing, there is relative friction between the sealing surfaces, which is easy to cause abrasions.

3. Forged steel gate valves generally have two sealing surfaces, which add some difficulties to processing, grinding and maintenance.

Forged steel valves have the following advantages over castings:

The hot forgings of forged steel valves improve recrystallization and grain refinement, resulting in the maximum possible strength and homogenization of the material.

The grains surround the contours of the valve body, reducing metal fatigue.

The forged body eliminates internal defects and unifies the metal construction for optimal performance.

External pressure is the biggest problem with inter-grain impact, but forging significantly reduces the occurrence of this problem and significantly improves the life of forged steel valves.

Forged steel valves, closed die forging, dimensional consistency control, no defects caused by the displacement of castings.

The ability to forge steel to fully meet the needs of most designs is the most important advantage. Reference.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Abstract:Forged steel gate valve refers to the valve in which the shut-off part (ram) moves in the vertical direction along the center line of the channel, and is mainly used for shut-off in the pipeline. So what are the classifications of forged steel gate valves?

Forged steel gate valves have a variety of classification methods, if according to the connection method of the valve, it can be divided into flange gate valve, welded gate valve, threaded gate valve. The advantages of forged steel gate valves are that the fluid resistance is small and the flow direction of the medium is not restricted, and the disadvantage is that the external dimensions and opening height are larger. Let's take a look at the relevant knowledge of forged steel gate valves.

Forged steel gate valve classification.

1. According to the pressure level of the valve, it is divided into: high-pressure gate valve and low-pressure (medium) pressure gate valve.

2. According to the driving mode of the valve, it is divided into: electric gate valve, pneumatic gate valve, and manual gate valve.

3. According to the standards of different countries, it is divided into: national standard gate valve, Zheng Xian American standard gate valve, German standard gate valve, and Japanese standard gate valve.

4. According to the connection mode of the valve, it is divided into: flange gate valve, welded gate valve, and threaded gate valve (also divided into internal thread and external thread).

Advantages of forged steel gate valves.

1. The fluid resistance of the forged steel gate valve is small, and the sealing surface is less brushed and eroded by the medium.

2. Forged steel gate valve is suitable for small-diameter pipelines with class150 2500 and working temperature -29 425 (carbon steel) or -29 500 (stainless steel) for cutting off or connecting the medium in the pipeline.

3. The medium flow direction of socket welded forged steel gate valve is not restricted, and it does not disturb the flow and does not reduce the differential pressure grip force. The sealing performance is very good, and the sealing surface is less eroded when fully opened.

4. The ram is placed vertically in the valve body, and the valve disc of the globe valve is placed horizontally in the valve body, so the structural length is shorter than that of the globe valve. 5.The internal medium channel of the forged steel gate valve body is straight, and the medium does not change its flow direction when it flows through the gate valve, so the fluid resistance is small.

5. The butt welded forged steel gate valve has a simple shape, short structural length, good manufacturing process, and a wide range of applications.

6. The movement direction of the forged steel gate valve is perpendicular to the fluid direction, and it can be fully opened and closed. Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

Disadvantages of forged steel gate valves.

1. The overall size and opening height are large. The installation requires a large amount of space.

2. In the process of opening and closing, there is relative friction between the sealing surfaces, which is easy to cause abrasions.

3. Forged steel gate valves generally have two sealing surfaces, which add some difficulties to the cleaning, grinding and maintenance of the Xucong cong.

Forged steel gate valve is a kind of gate valve widely used in pipelines, which plays the key role of connecting and breaking the medium of dust destroyer. It is not suitable to adjust the total flow of the medium, but the total flow can be judged according to the design elevation of the forged steel gate valve and the high-pressure gate valve (for example, the elastic seat gate valve for fire protection is equipped with an opening and closing scale). Compared with other gate brother digging valves, the application range of working pressure, environmental temperature, specifications and models and other factors is widespread.

Cast steel gate valve is a general term for all gate valves that are processed with metal steel cast parts. The sealing surface of the cast steel gate valve is divided into two kinds: automatic and forced sealing, when the sealing surface is formed by the pressure of the medium, it is automatic sealing, and relying on external force is forced sealing, although relying on the medium is different, but the sealing effect of the two is almost the same. Cast steel gate valves are used as interception devices in tap water, petroleum, chemical and other pipelines.

Next, I will introduce to you the classification of cast steel gate valve and its advantages and disadvantages.

Classification

Cast steel gate valve: according to the material, there are carbon steel gate valves, stainless steel gate valves, low-alloy steel gate valves (high-temperature resistant chromium-molybdenum steel belongs to this category), low-temperature steel gate valves, etc.

Under all kinds of cast steel gate valves, there are various specific steel grades commonly used as follows:

1. The casting grades of carbon steel gate valve are: WCA, WCB, WCC, LCB, etc.; Applicable temperature: -46 degrees Celsius and 425 degrees Celsius.

2. Stainless steel gate valve casting grade: 301 stainless steel, CF8 stainless steel (corresponding to 304 stainless steel forgings), CF8M stainless steel (corresponding to 316 stainless steel forgings), etc.; Applicable temperature: -198 degrees Celsius and 816 degrees Celsius.

3. Low-alloy steel is divided into high-temperature alloy steel and high-strength low-alloy steel, of which high-temperature alloy steel is often referred to as chromium-molybdenum steel.

Casting grades of chromium-molybdenum steel gate valves: ZG1Cr5MO, ZG15CR1MOV, ZG20CRMOV, WC6, WC9, C12A, etc. The applicable temperature is 550 degrees Celsius and 750 degrees Celsius.

The applicable temperature of each specific grade material is different, depending on the actual operating conditions.

According to the stem lifting points

Gate valves can be divided into open rod gate valves and dark rod gate valves according to whether the valve stem is raised or lower. The valve stem is lifted and lowered while rotating, and it is an open rod gate valve; The stem will only rotate and will not rise or fall, which is a dark stem gate valve.

If the gate plate of the open rod gate valve moves in a straight line with the valve stem, it is called the lifting rod gate valve (also called the open rod gate valve).

Pros and cons:

1. The advantages of cast steel gate valve: low fluid resistance, small brushing and erosion of the sealing surface by the medium. Less effort to open and close.

The flow direction of the medium is not restricted, and there is no turbulence or pressure reduction. The structure is simple, the structure length is short, the manufacturing process is good, the high temperature and high pressure resistance can be selected, and the application range is wide.

2. The disadvantages of cast steel gate valves: erosion and abrasion are easy to cause between the sealing surfaces, and it is difficult to maintain. The overall size is large, and a certain amount of space is required for opening, and the opening and closing time is long.

The above is the classification of cast steel gate valve and its advantages and disadvantages introduced to you today. Cast steel gate valves of different materials are suitable for different places, and the advantages of cast steel gate valves are many, so the scope of application is very wide, but because it will be more troublesome to maintain, so when choosing a gate valve, it is necessary to consider whether the choice of cast steel gate valve meets the needs in combination with its advantages and disadvantages and the place of use. The function of cast steel gate valve is not only to intercept the flow, but also to control the flow of liquid, so cast steel gate valve will be used in many places.

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The carbon steel gate valve is a cast steel gate valve, which is represented as Z41H-16C from the valve model

Carbon steel is carbon steel, including cast carbon steel, rolled carbon steel, forged carbon steel, etc.; Cast steel is a variety of cast steel parts obtained through casting methods, including cast carbon steel, cast alloy steel, etc.

The so-called cast steel and carbon steel are just the names produced by the different classifications of steel.

Many people will think that carbon steel gate valve and cast steel gate valve are 2 kinds of material valves, the following by Wenzhou Boyuan valve to analyze:

Cast steel check valve and carbon steel check valve are check valves of the same material, both of which are made of WCB A216 carbon steel.

Cast steel check valve, because the WCB material of the valve body, the blank are cast, so the name is Siyi, it is called cast steel check valve.

Carbon steel check valve, because the main material of WCB material is carbon steel, so it is named carbon steel check valve.

Forged steel ball valve and cast steel are mainly the forging process of steel, and the processing form is different:

Cast steel: The steel used to cast castings. A type of cast alloy. Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast special steel.

Cast steel refers to a kind of steel casting produced by casting method. Cast steel is mainly used to manufacture some parts with complex shapes, difficult to forge or cut and form, and require high strength and plasticity.

Forged steel ball valve: Forged steel ball valve refers to a variety of forgings and forgings produced by forging methods. The quality of forged steel ball valves is higher than that of steel castings, and can withstand large impact forces, and the mechanical properties of plasticity, toughness and other aspects are also higher than those of steel castings, so all important machine parts should use forged steel ball valves.

Casting is liquid molding, and forging is a plastic deformation process, forging workpieces can improve the internal structure of the organization, good mechanical properties, uniform grains, important workpieces must be forged, casting will cause tissue segregation, tissue defects, of course, casting has his benefits, forming complex workpieces forging is not easy to open the mold, so take casting.

Cast steel gate valves have the following advantages:

The fluid resistance is small, and the sealing surface is less affected by the medium and erosion.

Less effort to open and close.

The flow direction of the medium is not restricted, and there is no turbulence or pressure reduction.

The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.

The disadvantages of cast steel gate valves are as follows:

It is easy to cause erosion and abrasion between the sealing surfaces, and it is difficult to repair.

The overall size is large, and a certain amount of space is required for opening, and the opening and closing time is long.

The structure is more complex.

Types of cast steel gate valves.

According to the sealing surface configuration, it can be divided into wedge gate valve and parallel gate valve, and wedge gate valve can be divided into:

Single gate, double ram and elastic ram; Parallel ram type gate valves can be divided into single ram type and double ram type. According to the thread position of the stem, it can be divided into two types: open rod gate valve and dark rod gate valve.

Main uses of cast steel gate valves:

Control of pipeline flow, pressure and temperature in various industrial automation productions. For example: electric power, metallurgy, petrochemical, environmental protection, energy management, fire protection system, etc.