What are the characteristics and structures of high temperature gate valves?

How about the national standard gate valve? This question cannot be generalized and should be analyzed according to your specific situation. Here is a brief introduction to the characteristics of the national standard gate valve for your reference.

Light weight: The body is made of high-grade ductile black cast iron, which is about 20% 30% lighter than the traditional gate valve, and is easy to install and maintain. Flat-bottomed gate:

The traditional gate valve is often accumulated in the groove at the bottom of the valve due to foreign objects such as stones, wood, cement, iron filings, sundries, etc., which is easy to cause water leakage phenomenon due to the inability to close tightly. Overall rubberization: The ram is made of high-quality rubber for the overall inner and outer rubber, and the first-class rubber vulcanization technology in Europe makes the vulcanized ram able to ensure accurate geometric rulers

The opening and closing parts of the high-temperature gate valve are the ram, the direction of movement of the ram is perpendicular to the direction of the fluid, and the gate valve can only be fully opened and closed, and can not be adjusted and throttled. The ram has two sealing surfaces, and the most commonly used mode gate valve has two sealing surfaces forming a wedge, and the wedge angle varies with the valve parameters, usually 2°52 when the medium temperature is not high' 。The gate plate of the wedge gate valve can be made into a whole, which is called a rigid gate; It can also be made into a ram that can produce a slight amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle in the processing process, which is called the elastic ram.

The types of gate valves can be divided into wedge gate valve and parallel gate valve according to the sealing surface configuration, and the wedge gate valve can be divided into: single gate type, double gate type and elastic gate type; 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.

When the high-temperature gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, the sealing surface of the ram plate is pressed to the valve seat on the other side by relying on the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the ram should be forced to the valve seat by external force to ensure the tightness of the sealing surface.

If the gate plate of the high-temperature gate valve moves in a straight line with the valve stem, it is called the lifting rod gate valve (also known as the open rod gate valve). Usually there is a trapezoidal thread on the lifting rod, through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust.

When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation. In actual use, it is marked by the apex of the valve stem, that is, the position that cannot be opened, as its fully open position.

In order to account for the lock-up phenomenon of temperature changes, it is usually opened to the apex position, and then reverted back to 1 2 1 turns, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the ram (i.e. the stroke).

Some gate valves, the stem nut is located on the gate, and the handwheel rotates to drive the valve stem to rotate, and the gate is lifted, this valve is called the rotary rod gate valve or the dark rod gate valve.

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.

The characteristics of the high temperature and high shot let the pressure gate valve be explained.

The high-pressure gate valve is flanged and is an integral direct-cast valve, which is mainly used for pipelines with water, steam, oil and other pressures below the pressure, and the middle part is connected by bonnet, even if it works in a high temperature and high pressure environment, the sealing function is still very superior. The upper part of the sealing surface is surfacing cemented carbide, and the pure gold layer after processing is 3, which has the advantages of wear resistance, high temperature resistance, Zen punch corrosion resistance, and durability.

The structure of the high-temperature and high-pressure gate valve.

The seat sealing surface is made of iron-based chromium-nickel stainless steel surfacing process, which has good wear resistance. The surface of the stem is treated with corrosion-resistant nitriding treatment, which has good corrosion resistance and scratch resistance.

High temperature and high pressure gate valve is a kind of valve widely used in petroleum, chemical, electric power and other industries, its characteristics and structure are as follows:

Features: 1) It is suitable for fluid control in high temperature and high pressure environment, and has good sealing performance and corrosion resistance.

2) It has a high pressure-bearing capacity and high temperature resistance of the bucket pin, and can operate stably in a high temperature and high pressure environment.

3) The structure is simple, easy to operate, and the maintenance cost is low.

Structure: 1) Valve body: Usually made of cast steel, with high strength and corrosion resistance.

2) Valve core: Usually made of stainless steel and other materials, with high hardness and wear resistance.

3) Sealing structure pinning: usually using metal sealing structure or elastic sealing structure, which can maintain good sealing performance in high temperature and high pressure environment.

4) Operating mechanism: usually manual operation or electric operation, which can realize switch control and remote control.

"Gate valve for high-temperature and high-pressure power station", also known as special valve for power station, is mainly used for cutting off or connecting pipeline medium on the pipelines of various systems of thermal power stations. Applicable medium: non-corrosive media such as water celery, steam, etc.

Compared with other valves, the characteristics of power station valves are high temperature and high pressure, unique self-sealing design, the higher the pressure, the more reliable the sealing. Due to the special performance, technical characteristics and working conditions, the product has also formed a characteristic that cannot be replaced by other products. This type of valve should generally be installed horizontally in the pipeline.

The insulation gate valve is mainly used in petroleum, chemical, metallurgy, pharmaceutical and other systems, the jacket of the valve is welded between the two flanges of the valve, the side and bottom of the valve are provided with the connecting port of the jacket, and the steam or other hot insulation medium can flow freely in the jacket to ensure that the viscous medium can flow smoothly through the valve.

The fluid resistance is small, and the sealing surface is scoured and eroded by the medium is small.

Less effort to open and close.

The flow direction of the medium is not restricted, and the flow is not disturbed and the pressure is not reduced.

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

The opening and closing parts of the cryogenic gate valve are the ram, the direction of movement of the ram is perpendicular to the fluid direction, and the gate valve can only be fully opened and closed, and can not be adjusted and throttled. The ram has two sealing surfaces, and the most commonly used mode gate valve has two sealing surfaces forming a wedge, and the wedge angle varies with the valve parameters, usually 50, and 2°52 when the medium temperature is not high' 。The gate plate of the wedge gate valve can be made into a whole, which is called a rigid gate; It can also be made into a ram that can produce a slight amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle in the processing process, which is called the elastic ram.

The performance of the high temperature valve is as follows:

2。There is less tendency to temper brittleness.

3。The high-temperature valve has good machinability and is beautiful after processing.

4。Good weldability.

5。The shock absorption performance is good, and the hammer will be smashed with the best feeling, and the advantages of the high-temperature valve cannot be violently destroyed.

1).Good processability.

2).Good shock absorption.

3).Welding is easy.

Element symbol: cr-mo