It can explain the three principles of steam trap work, density, temperature, phase change, and what

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.

Aqueous liquid phase. Ice solid phase.

Steam vapor phase.

The process of changing from one phase to another is called phase transition.

Reference: Encyclopedia.

Venturi. A steam trap is a type of steam trap that appears to be a new type of steam trap. It seems to be new to say that the basic principle is still thermodynamic orifice plate type (which has long been obsolete) hydrophobic.

The principle is: due to the change of the phase state of the medium with a fixed aperture, the flow velocity changes, and the change of flow velocity brings about the change of resistance, which plays a certain role in regulation. Obviously, this adjustment effect is very limited, and the pressure and flow rate of the steam system and equipment in practical application change greatly, and the venturi method is difficult to adapt to this change and cause steam leakage; The steam leakage generated by this hydrophobic method also has a great impact on the pressure change of the downstream hydrophobic system, which promotes the change of the system pressure difference, which reacts to the hydrophobic link and causes the overall system pressure disorder.

Therefore, this hydrophobic method is difficult to meet the needs of system operation and energy saving in most occasions.

Venturi steam traps, venturi traps have no moving parts or on/off cycles that do not exhibit the wear and failure inherent in mechanical traps. Venturi traps take advantage of the physical law of two-phase flow – the difference in density between steam and condensate – to discharge condensate continuously. As a result, venturi traps are used in most steam equipment and are not only extremely long-lasting, but also more energy-efficient than mechanical traps.

The Venturi trap is definitely not a new type of trap, but rather an improved version of an old trap, that is, an improved version of the orifice trap. In fact, the products of some foreign companies are not venturi curves according to their internal structure, and should belong to the orifice plate type. Don't be fooled by the idea of playing with something old and new.

Taking advantage of the density difference between steam and water, at the orifice of the trap, the high-density condensate squeezes out the low-density steam, preferentially discharges the trap, and generates flash steam at the other end of the valve, forming a reverse pressure, so as to ensure the balance of pressure at both ends of the valve, discharge the condensate and prevent steam loss.

Traps play a role in the steam heating system to block steam drainage, and choosing the right trap can make the steam heating equipment achieve the highest working efficiency. In order to achieve the best results, it is necessary to have a comprehensive understanding of the working performance and characteristics of various types of traps.

There are many types of traps, each with different properties. When choosing a trap, you should first choose its characteristics to meet the optimal operation of the steam heating equipment, and then consider other objective conditions, so that the choice of the trap you need is correct and effective.

Traps need to be able to "identify" steam and condensate in order to act as a steam barrier drain. The "identification" of steam and condensate is based on three principles: density difference, temperature difference, and phase transition.

Therefore, three types of traps are manufactured according to three principles: mechanical, thermostatic, and thermodynamic.

Change of state of matter. The mutual transformation between different phases is called "phase transition" or "change of state of matter". The vast majority of the various substances that exist in nature exist in three aggregate states: solid, liquid, and gas.

In order to describe the different aggregation states of matter, "phase" is used to represent the "phase" of the three forms of solid, liquid and gas of matter. Broadly speaking, phase refers to a homogeneous part of a material system with the same physical properties, which is separated from the other parts by a certain interface. For example, in a system consisting of water and ice, ice is one phase and water is another.

Iron, iron, and δ iron are the three phases of iron crystals. There are generally two types of mutual transitions between different phases, namely first-order phase transitions and second-order phase transitions. The phase change always occurs at a certain pressure and at a certain temperature.

Phase transition is a very common physical process, which is widely involved in production and scientific and technological work. In the process of mutual conversion of material forms, there must be inhalation or release of heat. The main differences between the three states of matter are the distance between their molecules, the magnitude of the interaction force between molecules, and the way in which heat moves.

Thus, under the right conditions, an object can change from one state to another. The transformation process is from quantitative change to qualitative change. For example, in the process of changing from a solid state to a liquid state, the solid substance continuously absorbs heat and the temperature gradually increases, which is a process of quantitative change; When the temperature rises to a certain level, that is, when the melting point is reached, and the heat supply continues, the solid state begins to transform to the liquid state, and then a qualitative change occurs.

Although the heat is continued, the temperature does not rise, but the solids and liquids coexist until they are completely melted.

This characteristic of PCMs can be used to store energy or control ambient temperature, and has applications in many fields. The nano-graphite phase change energy storage composite materials developed by this project under the support of the Shanghai Youth Science and Technology Rising Star Program, the National Natural Science ** and the Shanghai Nanotechnology Special Program have the advantages of high energy storage density, excellent thermal conductivity and heat exchange effect, safety and stability, flame retardant and environmental friendliness. Compared with the existing phase change energy storage materials, the thermal conductivity of nanographite-based phase change energy storage composites is increased by 1 2 orders of magnitude, the phase change temperature is continuously adjustable between -40 +70 °C, the energy storage density can reach about 150 200 J G, and the performance deterioration is less than 5% after 1000 cycles.

Phase change materials have a wide range of application fields, and have obvious application value in many fields such as building energy conservation, modern agricultural greenhouses, solar energy utilization, refrigeration and transportation of biomedical products and food, physical medicine (hyperthermia), heat dissipation of electronic equipment, athletes' cooling (warm) clothing, special temperature control clothing, aerospace science and technology, military infrared camouflage, power peak shaving applications, industrial waste heat storage and utilization, etc.

Phase change materials, Liwang new materials have 9002 9004 cooling phase change materials, phase change material energy storage density 80 180 J g, phase change temperature 5 120;

Traps are mainly used for condensate drainage in steam pipes, and they are able to drain water without venting. Save energy.