Because of the unique non-return feature of a check valve, it is common in several industrial applications as the following sections highlight.

Industry sector

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Information industry

This sector, also called service industry, includes industries that, while producing no tangible goods, provide services or intangible gains or generate wealth. In free market and mixed economies this sector generally has a mix of private and government enterprise.

The primary function of a check valve performs in a system is to prevent backflow. The onset of backflow could be detrimental to industrial systems in several ways. For example, backflow causes the impellers of pumps and compressors to reverse, which may cause burnout.

Outline of industry

Water pollution is the release of substances into natural bodies of water that interfere with the functioning of ecosystems and human use of the water.

In certain compressor systems, there could be a need to keep some parts pressurized while others are depressurized. Achieving this is possible by strategically locating check valves to ensure air that enters pressurized sections cannot leave.

In practice, the names check valve and non-return valve are used interchangeably because of the similarities they share. Both valves allow flow in only one direction; however, there is a fundamental difference between them. A non-return valve takes up either a fully open or fully closed position depending on the inlet pressure of the fluid. Whereas the check valve offers a range of flow rates depending on the inlet pressure of the fluid. Thus, it is safe to say that a check valve is a subset of non-return valves that offers flow regulation.

industry sector中文

The genetic industries include agriculture, forestry, and livestock management and fishing—all of which are subject to scientific and technological improvement of renewable resources. The extractive industries include the mining of mineral ores, the quarrying of stone, and the extraction of mineral fuels.

Ball check valves are one of the most important components when controlling water flow from the feed pump to the boiler. As boiler pressure increases beyond the pump pressure, these valves prevent backflow from the boiler to the pump. Also, they prevent backflow when the feed pump is not in operation.

In an industrial setting, this equipment is quite expensive, so a check valve serves as a protective device. Also, backflow could result in the undesirable mixing of media or the contamination of upstream media. For instance, in a water treatment plant, check valves ensure that treated water does not return to the untreated water reservoir.

A check valve performs several functions in water pumps and water distribution systems in general. To ensure that there is always water in the pump for safe starting, check valves are always located at the pump entrance and exit lines. The presence of check valves at a pump isolates it from backflow and the harmful effects of water hammer. In water treatment facilities, it is common to find check valves in a series, so that wastewater cannot reenter the system. Also, check valves prevent elements from the environment from contaminating clean water.

Industry LIST

Another important use of a check valve is to avoid the occurrence of a water hammer. Water hammer happens when there is a rapid change in the velocity of a fluid. Generally, this occurs if moving fluid suddenly meets an obstacle, such as a valve closing rapidly. As a result, the fluid pulsates throughout the system with a significant pressure increase that may lead to pipe or equipment damage.

Textile mills generate one-fifth of the world’s industrial water pollution and use 20,000 chemicals, many of them carcinogenic, to make clothes.

Secondary industry may be divided into heavy, or large-scale, and light, or small-scale, industry. Large-scale industry generally requires heavy capital investment in plants and machinery, serves a large and diverse market including other manufacturing industries, has a complex industrial organization and frequently a skilled specialized labour force, and generates a large volume of output. Examples would include petroleum refining, steel and iron manufacturing, motor vehicle and heavy machinery manufacture, cement production, nonferrous metal refining, meat-packing, and hydroelectric power generation.

Light, or small-scale, industry may be characterized by the nondurability of manufactured products and a smaller capital investment in plants and equipment, and it may involve nonstandard products, such as customized or craft work. The labour force may be either low skilled, as in textile work and clothing manufacture, food processing, and plastics manufacture, or highly skilled, as in electronics and computer hardware manufacture, precision instrument manufacture, gemstone cutting, and craft work.

The damage may occur instantaneously or over time due to fatigue if the occurrence of water hammer is frequent. The design of non-slam check valves alongside an end damper is effective in preventing this phenomenon, especially in vertical tubing.

Industry example

Type of industry

The major functions of a check valve in flow systems include prevention of backflow, avoiding water hammer, fugitive emissions control, and pressure balance and relief.

A check valve also functions effectively as a pressure relief valve to prevent excessive pressure levels in a pipe section or vessel. The check valve in such an application would vent the gas in the section into the environment or another vessel when the pressure reaches a threshold. Then, when the pressure falls below the threshold, the valve shuts the exit.

The industries of this sector include banking, finance, insurance, investment, and real estate services; wholesale, retail, and resale trade; transportation, information, and communications services; professional, consulting, legal, and personal services; tourism, hotels, restaurants, and entertainment; repair and maintenance services; education and teaching; and health, social welfare, administrative, police, security, and defense services.

Primary industry tends to dominate the economies of undeveloped and developing nations, but as secondary and tertiary industries are developed, its share of the economic output tends to decrease.

As environmental laws become more restrictive, it is important to have valves qualified according to industry standards against leakage of gasses. A dual-plate check valve functions to prevent fugitive emissions, especially when the pressure boundary is without threaded plugs. Also, this dual plate design is effective against water hammer, easier to maintain, and has a longer life span.

While we have experienced environmental challenges, 50 years of progress has shown us what we can do when we pull together.

This sector of a nation’s economy includes agriculture, forestry, fishing, mining, quarrying, and the extraction of minerals. It may be divided into two categories: genetic industry, including the production of raw materials that may be increased by human intervention in the production process; and extractive industry, including the production of exhaustible raw materials that cannot be augmented through cultivation.

You may know all about what happens to water aboveground, but what do you know about groundwater? Test your knowledge with this quiz.

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A check valve is common in control applications to ensure that the flow of liquid or gas is in only one direction. To achieve this function, check valves usually have two ports; one for fluid to enter, while the other is for the exit of fluid. In this article, we review the key functions of a check valve in industry, its application in various types of systems, and functionality vs a non-return valve.

industries翻译

This sector, also called manufacturing industry, (1) takes the raw materials supplied by primary industries and processes them into consumer goods, or (2) further processes goods that other secondary industries have transformed into products, or (3) builds capital goods used to manufacture consumer and nonconsumer goods. Secondary industry also includes energy-producing industries (e.g., hydroelectric industries) as well as the construction industry.

Industry, a group of productive enterprises or organizations that produce or supply goods, services, or sources of income. In economics, industries are customarily classified as primary, secondary, and tertiary; secondary industries are further classified as heavy and light.