What kind of gas source control should be used for pneumatic valves in gas pipelines?

For gas pipelines, pneumatically adjustable ball valves (DN80) and butterfly valves (DN100) are usually used.

The control form is: air source (compressed air) + signal source (4 20mA or 0 10V).

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 pneumatic valve of the gas pipeline should be controlled by compressed air as the air source.

Connect the air tank or air compressor. Give him air pressure so that he will go on the trip.

Ventilation. The method of heating, shaking the liquefied gas tank, and putting down the liquefied gas tank is not correct, and there are certain dangers. The correct way to deal with it is to replace the liquefied gas in time when the gas volume in the liquefied gas tank is insufficient, even if there is still some liquefied gas left in the liquefied gas tank, but it cannot be ignited, it is also necessary to consult a professional of liquefied gas to let the other party deal with it.

When the gas in the liquefied gas pipe is insufficient, what method should be used to obtain the gas and heat it in hot water.

Constantly shake the gas tank.

The practice is very dangerous, there will be potential safety hazards unfortunately, and it also has an impact on the service life of the bottle, it is best to change the air, now many gas stations are weighed, macromolecular liquefied gas is not easy to gasify in winter, but its weight is considerable, so the practice of weighing is still very fair, in addition to check your gas pipeline and gas stove, the pipeline is recommended to be replaced every year and a half, ** is not expensive, the air volume of the gas stove in winter can be properly adjusted, because the liquefied gas out of the molecular weight is relatively small, It is not the same as when it is hot.

Of course, it's better to ventilate.

Method A can only solve the problem for a while, C has little effect, and if the air pressure is insufficient, ventilation is the only way. I'm sure you must know the law of conservation, and you can only completely solve the problem by adding gas without gas.

A, C practice is very dangerous, make it unfortunate will have potential safety hazards, and also have an impact on the service life of the bottle, the best is to change the air, now many gas stations are weighed, macromolecular liquefied gas is not easy to gasify in winter, but its weight is considerable, so the practice of weighing is still very fair, in addition to check your gas pipeline and gas stove, the pipeline is recommended to be replaced every year and a half, ** is not expensive, in winter, the air volume of the gas stove can be properly adjusted, Because the liquefied gas that comes out is relatively small in molecular weight, it is different from the composition when it is hot.

The main components of liquefied gas, propane and butane, the combustion temperature is 400 500, the above three ways will not cause **, but attention should be paid to the damage of the cylinder.

The outdoor gas pipeline adopts corrosion-resistant sulfur-resistant material pipeline valves. The natural gas transported by the pipeline contains large amounts of hydrogen sulfide, a toxic and highly corrosive gas, prior to desulphurisation. Even natural gas that has been treated by processes such as desulfurization still has residual hydrogen sulfide.

Therefore, the selection of pipeline valves should be made of corrosion-resistant and sulfur-resistant materials.

Once the pipeline is put into operation, it is not allowed to stop operation for several years, there is no break for a moment, and there is no overhaul period. Once the pipeline valve connected in series on the pipeline fails, the consequences are unimaginable. Therefore, the wearing parts of pipeline valves require a long service life.

Controllers are generally in the station or control room, and they are required to have reliable control performance for the valve, and the valve itself is required to have protective and explosion-proof measures. In particular, the long-opening valve requires accurate cut-off in the sudden change of situation. Reliable control performance is therefore the focus.

For long-distance pipelines, ball valves are generally used, and the same is true for courtyard pipelines, and ordinary copper ball valves are generally used for standpipes and indoor valves in residential areas.

Gas globe valves, gas ball valves, eccentric butterfly valves, but depending on where you use them, there are many types.

Gas shut-off valve or gas ball valve, me.

The community is uniformly installed, generally installed at the upper and lower ends of the gas meter, if it is an outdoor gas meter, it is installed in the kitchen by the window, it seems that now it is necessary to install a gas detection valve, gas leakage will send out an alarm sound!

Code for the design of urban gas: gas inlet pipes shall not be laid in bedrooms, toilets, warehouses of flammable or explosive materials, rooms with corrosive media, power generation rooms, distribution rooms, substation rooms, air-conditioning rooms that do not use gas, ventilation rooms, computer rooms, cable trenches, heating ditches, flues and air inlet ducts, garbage ducts and other places.

2. Residential gas inlet pipes should be located in non-residential rooms that are easy to maintain, such as kitchens, corridors, and closed balconies connected to kitchens (balconies should be closed when transporting wet gas in cold areas). When it is difficult, it can be introduced from the stairwell, but metal pipes should be used and the entry pipe valve should be located outdoors.

3. The gas inlet pipe of commercial and industrial enterprises should be located in the room or gas meter room where the gas is used. 4. The gas inlet pipe should be introduced through the wall along the ground of the outer wall. The upper end of the outdoor exposed pipe section should be cleaned with tee and wire plug not less than DN15, and anti-corrosion treatment should be done.

Wet gas should be kept warm when transporting in cold areas.

The inlet pipe can be buried through the exterior wall of a building or the foundation into the interior. When the inlet pipe passes through the wall or foundation and enters the building, it should be out of the indoor ground within a short distance, and should not be laid horizontally under the indoor ground.

The community is uniformly installed, generally installed at the upper and lower ends of the gas meter, if it is an outdoor gas meter, it is installed in the kitchen window position, it seems that now it is necessary to install a gas detection valve, gas leakage will send out an alarm sound!

How many types of combustion gas sources are there? The combustion gas sources in life are roughly divided into three categories: liquefied petroleum gas (Y), artificial gas (R), and natural gas (T).

Liquefied petroleum gas (liquefied gas):

It is a kind of petroleum tail gas left in the process of refining gasoline, kerosene, diesel, heavy oil and other oil products, through a certain procedure, the petroleum tail gas is utilized, and pressurized measures are taken to make it become a liquid, which is packed in a pressurized container, and the name of liquefied gas comes from this. Its main components are ethylene, ethane, propylene, propane and butane, etc., which are liquid in the gas cylinder, and once they flow out, they will vaporize into combustible gas about 250 times larger than the original volume, and are very easy to diffuse, and will burn or ** when encountering an open flame. Therefore, special attention should also be paid to the use of liquefied gas.

Coal gas: It is prepared from solid raw materials such as coal or coke by dry distillation or vaporization, and its main components are carbon monoxide, methane and hydrogen. Therefore, the gas is toxic and easy for the air to form a ** mixture, which should be used with great attention.

Natural gas: A broad term for naturally occurring gases buried in formation. Natural gas stores a kind of combustible gas rich in hydrocarbons, the main component of natural gas is methane, which is an important energy source, widely used as city gas and industrial fuel, and is an important chemical raw material.

Natural gas, water gas, liquefied gas.

There is natural gas, coal gas, liquefied gas!

Answer]: a, c

When the gas pipeline is connected with threads, it is simple to judge the disturbance, and the gas pipe can be filled with thick white paint and PTFE film filler. Punching.

Answer]: a, b, e

The valve handwheel shall not be downward, and the hail shall not be done by avoiding the back-facing manipulation; Under the premise that the process source is allowed, the valve handwheel should be located at chest height to facilitate the opening of the valve.

Answer]: A The test point involved in this question is the hail loss of the valve position on the underground gas pipeline. In order to ensure the safety and convenience of the pipeline network, the valves on the silver slide of the underground gas pipeline are generally set at the valve well.