What is the function of the safety valve?

Relief valve. It is an important fluid control safety equipment in the industrial production process, so the selection of safety valve material is the basis of safety valve selection, if the material is not selected correctly, there is no way to talk about the safety of the safety valve, the following will be commonly used safety valve material selection to make an overview.

1. For low-pressure and normal temperature ordinary media with less than pressure, such as water, air, oil, etc., gray cast iron can be selected.

Brass, cast steel.

and other materials; 2. For the pressure of high-pressure and normal temperature ordinary media, such as water, air, oil, gas, etc., cast steel can be selected;

3. For high-pressure and normal temperature corrosive media of pressure, such as acetic acid.

Hydrochloric acid, sulfuric acid, etc., you can choose stainless steel materials;

Fourth, for the pressure of high pressure, high temperature and temperature ordinary media, such as water, air, oil, steam, etc., you can choose high temperature steel material.

1. For low-pressure and normal temperature ordinary media with a pressure of less than one megapascal, such as water, air, oil, etc., gray cast iron, brass, cast steel and other materials can be selected.

2. For high-pressure and normal temperature ordinary media with a pressure of 1.6 to 32 megapascals, such as water, air, oil, gas, etc., cast steel can be selected.

3. For high-pressure and normal temperature corrosive media with a pressure of 1.6 to 32 megapascals, such as acetic acid, hydrochloric acid, sulfuric acid, etc., stainless steel materials can be selected.

4. For high-pressure, high-temperature and high-temperature ordinary media with a pressure of 1.6 to 32 megapascals, such as water, air, oil, steam, etc., high-temperature steel materials can be selected.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.

There are cast iron, cast steel, stainless steel, copper.

Depending on what medium and temperature you use, choose which material.

Safety valves are generally brass!

The safety valve is a special valve that is normally closed under the action of external force of the opening and closing parts, and when the medium pressure in the equipment or pipeline rises to exceed the specified value, the medium in the pipeline or equipment is discharged to the outside of the system to prevent the medium pressure from exceeding the specified value. Safety valves belong to the automatic valve category, which are mainly used in boilers, pressure vessels and pipelines, and the control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation.

Technical term: nominal pressure: indicates the maximum allowable pressure of the safety valve at room temperature, and the safety valve for high-temperature equipment should not consider the reduction of the allowable stress of the material at high temperature. The safety valve is designed and manufactured according to the nominal pressure standard.

Opening pressure: also known as rated pressure or setting pressure, refers to the inlet pressure when the safety valve disc begins to rise under operating conditions, under which there is a measurable opening height and the medium is in a continuous discharge state that can be perceived by vision or hearing.

The function of the safety valve is to start or close automatically when the pressure system is too high when the pressure is too high when working, and is commonly used in installed and closed system equipment and pipelines to protect the safety of the system.

When the pressure in the equipment or pipeline where the safety valve is installed is greater than the preset pressure of the safety valve, it will automatically start to relieve the pressure to ensure that the medium pressure in the facility and pipeline is kept below the preset pressure, so as to protect the normal operation of the facility and pipeline and prevent accidents.

Safe Setup & Selection:

Safety valves on equipment or pipelines should generally be installed vertically and as close as possible to the equipment or pipeline to be protected. However, when the safety valve is closed in liquid pipes, heat exchangers or vessels, the pressure may rise due to thermal expansion when the valve is closed, and it can be installed horizontally.

Safety valves should generally be installed in a place that is easy to access and adjust, with sufficient working space around them. For example, the safety valve of the vertical container, below DN80, can be installed on the inside and outside of the platform; DN100 or more is installed on the platform outside the platform, with the help of which the valve can be repaired and overhauled.

It should not be installed at the dead end of a long horizontal pipe to avoid the accumulation of solids or liquids.

The nominal pressure of the safety valve is determined by the operating pressure, the operating temperature is determined by the operating temperature, the constant pressure value of the calculated safety valve is determined by the constant pressure scale of the tension spring or lever, and then the throat diameter of the safety valve is calculated according to the raw materials and structural type of the safety valve determined by the medium used, and then the throat diameter of the safety valve is calculated according to the discharge amount of the safety valve. The following are the general rules for the selection of safety valves.

Mechanism of the safety valve:

The safety valve is a kind of valve that protects the facilities from being damaged, it is often used in the pressure vessel and pipeline system, in order to prevent the pressure from being greater than the normal quota value, and the facility is damaged, when the pressure is greater than the normal quota value, the safety valve will transfer the excess medium to the low pressure system or the atmosphere, so as to achieve the pressure to the normal value.

Safety valves have many functions in the piping system, and almost all of the piping systems in urban cities and buildings now need safety valves. So what are the main functions of the safety valve? In fact, the safety valve is like a valve, which mainly plays the role of control and can realize the safety of the used fluid.

So what are the main functions of safety valves, let's take a look at the following specific introduction to increase our understanding of safety valves.

1.Controlling fluid usage and making industrial production more convenient is an important aspect of the role of safety valves. Especially in the chemical industry, if there is no control of the safety valve, then a lot of production work is difficult to carry out, if you rely on manual control alone, the production work is full of danger, and the accuracy of the control is also unstable.

With this safety valve, better control can be achieved and the risk of manual work can be reduced.

2.Control valves can also be used in buildings, whether it is a gas pipe or a water supply line, and safety valves are required to achieve overall control. The function of the safety valve is to realize the safety of use, and play a diversion role for these three-dimensional.

The fluid has a strong inertia, if there is no safety valve control, then there will be a lot of inconvenience in use, with the safety valve can achieve the control function, can achieve a good system control.

3.The safety valve can also play the function of safety assurance, and many of the functions of the safety valve are reflected in the effect of safety assurance. For example, for the control of the sewer system, if there is no safety valve, domestic sewage and domestic water are likely to mix, which will bring a lot of threats to our water safety.

The use of safety valves is to reduce such dangerous situations and increase the safety assurance of our lives.

4.The safety valve is also an important component to reduce the occurrence of danger, if there is a leak in the sewer, the leakage of sewage can be reduced by activating the safety valve, which can buy more time for rescue. The function of the safety valve is to prepare for the safety of life, with this component, our life can be more secure.

Safety valves are used in many fields, and there are many aspects of the role of safety valves. There are many types of safety valves, which can be used in different occasions. The safety valve seems to be an inconspicuous accessory, but in fact, it is used in many places in life and production, and it is a very important component.

Safety Pressure Relief Valve is a standard diaphragm safety pressure relief valve, which is mainly used in heating, air conditioning, thermal storage hot water system, irrigation system, control of cold and heat sources and system pressure. When the system pressure exceeds the set value of the safety valve, the safety valve automatically opens to release the system pressure into the atmosphere, and automatically closes when the pressure is lower than the safety value, so that the system with the safety valve can operate safely.

The safety valve is a kind of safety protection valve, mainly used in pipelines and various pressure-bearing equipment, when the working pressure of the medium exceeds the allowable pressure value, the safety valve automatically opens to discharge the medium, as the medium pressure decreases, the safety valve will be closed again, so as to prevent the danger of overpressure of the pipeline and equipment. Safety valves are divided into lever type, spring type and pulse type. Safety valves are suitable for use on the low pressure side of boiler room piping as well as in piping systems with different pressure levels.

Cast iron, mild steel, alloy steel, stainless steel and heat-resistant steel, special valve steel, copper alloy, aluminum alloy, nickel alloy, plastic, wood.

As long as it is not too luxurious (**** or something) or too hard (tool steel or something), it can be used as a valve body material.

Commonly used valve body materials can be divided into (refer to the division method of Vton in the United States):

1) Metal material valve: Its valve body and other parts are made of metal material. Such as cast iron valves, ductile iron valves, carbon steel valves, stainless steel valves, alloy steel valves, copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves, etc.

The common ones are Vton cast iron body butterfly valve, ductile iron body butterfly valve, carbon steel body material ball valve, stainless steel body material ball valve, Monel alloy body material globe valve, etc.;

3) Metal body lining valve: The shape of the valve body is metal, and the main surfaces inside that are in contact with the medium are lining, such as rubber lining valves, plastic lining valves, ceramic lining valves, etc. For example, the diaphragm valve made of carbon steel fluorine-lined valve body, the butterfly valve made of carbon steel fluorine-lined valve body, the fluorine-lined ball valve of stainless steel, the fluorine ball valve of carbon steel-lined valve body, etc.

The main body materials are: C carbon steel, I1Cr5Mo chromium-molybdenum steel, HCR13 series stainless steel, K malleable cast iron, L aluminum alloy, P0Cr18Ni9 series stainless steel, PL00Cr19Ni10 series stainless steel, Q ductile iron, R0Cr12Ni12Mo2 series stainless steel, RL00Cr17Ni14Mo2 series stainless steel, S plastic, T copper and copper alloy, Ti titanium and titanium alloy, V Chromium-molybdenum vanadium steel, Z gray cast iron.

The nominal pressure is quiet, indicating that the flange of the safety valve is suitable for connection with the pipe flange of the same nominal pressure.

The setting pressure is the opening pressure of the safety valve, which is the pressure at the inlet of the full valve of Anxingkai when the disc of the safety valve begins to move upward.

The discharge pressure is the pressure at the inlet of the safety valve after the disc is opened to the specified height (fully opened), and the pressure at the inlet of the safety valve is about the same as the setting pressure, because the jump of the safety valve from the specified height is a matter of an instant.

Common safety valves are generally as follows:

1. According to the overall structure and the form of the loading structure, it can be divided into three types: hammer lever safety valve, spring safety valve and control type. File Luck Call.

2. According to the ratio of the opening height of the disc type to the diameter of the valve flow, it can be divided into micro-opening type and full-opening safety valve.

3. According to the way of gas discharge of the safety valve, it can be divided into three types: fully enclosed, semi-enclosed and open.