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Weinan, Hanzhong, Ankang, Shangluo, Yulin, Xingping, Hancheng, Huayin, Gansu, Lanzhou, Tianshui, Pingliang, Jiuquan, Jiayuguan, Jinchang, Baiyin, Wuwei, Zhangye, Qingyang, Dingxi, Weinan, Yumen, Dunhuang Linxia, ​​cooperation, Qinghai, Xining, Golmud, Delingha, Jiangxi, Nanchang, Jiujiang, Zhuozhou, Ji'an, Yingtan, Shangrao, Pingxiang, Jingdezhen, Xinyu, Yichun, Fuzhou, Leping, Ruichang, Guixi, Ruijin, South Kang. Jinggangshan, Fengcheng, Yushu, Gaoan, Dexing, Taipei, Taichung, Keelung, Kaohsiung, Tainan, Hsinchu . Chiayi, Banqiao, Yilan, Zhubei, Taoyuan, Miaoli, Fengyuan, Changhua, Nantou, Taibao, Douliu, Xinying, Fengshan, Pingtung. * : Shell test does not include diaphragm, top cover Main parts materials [ Gas pressure reducing valve ] Dimensions Speciality Silica,Specialty Silica,Absorbent Powder And Thickening Agent,Prevent Caking With Long Storage Time Henan Minmetals East New Materials CO. LTD. , https://www.east-silicones.comSpeciality Silica
[ Gas pressure reducing valve ] function
[ Gas Pressure Reducing Valve] consists of a main valve and a pilot valve . The main valve consists of a valve seat / main valve disc / piston / spring and other components. The pilot valve is mainly composed of valve seat / valve / diaphragm / spring / adjustment spring. [ Gas Pressure Reducing Valve] Set the outlet pressure by adjusting the spring pressure , using the diaphragm to sense the outlet pressure change , and using the pilot valve to open and close the drive piston to adjust the size of the over-flow area of ​​the throttle valve of the main valve to realize the function of decompression and voltage regulation. .
Gas classification by source
Gas can usually be divided into natural gas, artificial gas, liquefied petroleum gas, and biomass gas.
natural gas
Natural gas is mainly a mixture of low-molecular hydrocarbons. According to the sources of natural gas, it can be generally divided into five types: gas field gas (or natural gas), associated gas, condensate gas field, coal bed methane, and shale gas.
Oil Associated Gas
The low hydrocarbon gas that comes with oil is called oil-associated gas. The methane content of petroleum associated gas is approximately 80%, the content of ethane, propane and butane is approximately 15%, and the low calorific value is approximately 45 MJ/m.
Gas condensate gas field
Gas condensate gas is a gas containing petroleum light fractions. In addition to large amounts of methane, condensate gas fields also contain 2% to 5% pentane and other hydrocarbons, with a low calorific value of approximately 48 MJ/m.
 Artificial gas
Artificial gas refers to the combustible gas that is obtained by converting solids and liquids (including coal, heavy oil, light oil, etc.) as raw materials, and meets the quality requirements of the current standard "artificial gas" GB/T13612. According to the difference of raw materials and processing methods, various types of artificial gas can be produced.
Solid fuel dry distillation gas
The gas obtained by dry distillation of coal using a coke oven, a continuous upright carbonization furnace, or the like is referred to as a dry distillation gas.
The production of gas by dry distillation can produce gas of 300-400 m per ton of coal. The content of methane and hydrogen in this type of gas is relatively high, with a low calorific value of approximately 17 MJ/m. The long production history of retorted gas is an important source of gas in some cities and towns in China.
Solid fuel gasification
Pressure gasification gas, water gas, producer gas and so on are all examples.
(1) Pressurized gasification is performed under a pressure of 2.0 to 3.0 MPa using coal as a raw material and pure oxygen and steam as a gasifying agent to obtain high-pressure gasification gas. Its main components are hydrogen and methane, with a low calorific value of about 15 MJ/m. If there are lignite or long-flame coal resources near the town, Lurgi furnaces can be used to produce pressure gasified gas. This set of equipment can be built near the coal mine (generally known as pit gasification) without the need for additional pressure-feed equipment. The gas is sent to more distant towns for use as town gas.
(2) The main components of water gas and producer gas are carbon monoxide and hydrogen. The low calorific value of water gas is about 10 MJ/m, and the low calorific value of the producer gas is about 6 MJ/m. Because these two gasses have low calorific value and are toxic, they cannot be used alone as gas sources for town gas, but they can be used to heat coke ovens and continuous vertical carbonization furnaces to replace the retorted gas with higher calorific value and increase the supply of towns. The gas volume can also be blended with dry distillation gas and heavy oil heat storage cracking gas.
Oil gas
Oil-producing gas refers to the use of heavy oil (remaining oil after the refinery extracts gasoline, kerosene, and diesel oil) to obtain town gas. According to different preparation methods, it can be divided into two types: heavy oil thermal storage pyrolysis gas and heavy oil thermal storage catalytic cracking gas. Heavy heat storage heat pyrolysis gas is mainly composed of methane, ethylene and propylene, and the low calorific value is about 41 MJ/m. The gas production per ton of heavy oil is about 500-550 m. The heavy oil heat storage catalytic pyrolysis gas contains a large amount of hydrogen, also contains methane and carbon monoxide. The low calorific value is about 17 MJ/m. Using a three-cylinder catalytic cracker, the gas production per ton of heavy oil is about 1200 to 1300 m.
Compared with other gas production methods, the device for producing oil gas is simple, the investment is saved, the area is small, the construction speed is fast, the management staff is small, and the startup and shutdown furnaces are flexible. Oil gas can be used as the basic gas source for town gas, and it can also be used as the gas source for urban gas.
Naphtha and naphtha gas plants can also use naphtha (naphtha) as raw materials for gas production. Compared with heavy oil, naphtha has the following advantages: It contains less sulfur, does not generate tar, smoke and sewage, and has high gasification efficiency.
Blast furnace gas
Blast furnace gas is an auxiliary gas produced by iron and steel companies. The main components are carbon monoxide and nitrogen, and the low calorific value is about 4 MJ/m. Blast furnace gas can be used as heating gas for coke ovens to make more coke oven gas available to towns. Blast furnace gas is also commonly used as a fuel for boilers or blended with coke oven gas for industrial gas sources.
Liquefied gas
Liquefied petroleum gas is a portion of hydrocarbons obtained as a by-product during the extraction and refining of petroleum.
At present, the domestically produced liquefied petroleum gas mainly comes from the catalytic cracking unit of a refinery. Liquefied petroleum gas production usually accounts for about 7% to 8% of the catalytic cracker throughput. The main components of liquefied petroleum gas are propane, propylene, butane and butene, which are also commonly referred to as C3 and C4. That is, they are expressed only by the number of carbon atoms of hydrocarbons. These hydrocarbons are gaseous at normal temperature and pressure, and can easily be converted into a liquid state when the pressure is increased or the temperature is lowered. From gas to liquid, its volume is reduced by approximately 250 times. The low calorific value of gaseous liquefied petroleum gas is approximately 100 MJ/m. The low calorific value of liquid LPG is about 46 MJ/kg.
[ Gas pressure reducing valve ] Pressure adjustment step
Follow the steps below to slowly turn the adjustment screw to complete the setting. Improper adjustment operations may create water hammers or squeaks and may cause damage to the pressure reducing valve or other equipment.
(1) Closing the valve before and after closing the pressure reducing valve. Under the condition that the safety valve does not jump, open the bypass pipeline cut-off valve and keep enough time to complete the use of the circulating medium to purify the foreign matter or rust layer in the pipeline. . After the purge is complete, close the bypass line shut-off valve.
(2) Slowly open the cut-off valve installed in front of the pressure reducing valve, adjust the opening degree of the cut-off valve after adjusting the pressure reducing valve, and maintain a small flow rate through the pipeline.
(3) Loosen the lock nut, slowly turn the adjustment screw, and observe the pressure gauge behind the valve until the desired setting is reached (clockwise rotation pressure rise, counterclockwise rotation pressure drop). For models with handles, since the handle is in the self-locking position under normal conditions, when adjusting the pressure, first press the handle, release the self-locking, slowly turn the adjustment screw, and observe the pressure gauge near the valve until the request. The setting of the device until (clockwise rotation of the handle, the valve pressure increases; counterclockwise rotation of the handle, the pressure drop after the valve.
(4) Slowly open the pressure reducing valve and cut off the valve, and follow step (3) to further adjust the pressure of the valve until the desired setting is reached.
(5) After completing the adjustment, tighten the lock nut. For models with a handle, pull out the handle and lock it with the internal device; if the handle is not locked, turn the handle left and right to complete the self-locking action.
[ Gas pressure reducing valve ] basic performance
The reducing valve uses the opening degree of the opening and closing member in the control valve body to regulate the flow of the medium, reduces the pressure of the medium, and at the same time regulates the opening degree of the opening and closing part by means of the pressure behind the valve, so that the pressure behind the valve Keeping within a certain range, maintaining the pressure of the outlet within the set range under the constant change of import pressure,
(1) Pressure regulation range: It refers to the adjustable range of the pressure relief valve output pressure P2. Within this range, the required accuracy is required. The pressure regulation range is mainly related to the stiffness of the pressure regulating spring.
(2) Pressure characteristics: It refers to the characteristic that the output pressure fluctuates due to input pressure fluctuation when the flow g is constant. The smaller the output pressure fluctuations, the better the relief valve characteristics. The output pressure must be lower than the input pressure - the set value does not change substantially with the input pressure.
(3) Flow characteristics: It refers to the input pressure - timing, output pressure changes with the change in the output flow g. When the flow g changes, the smaller the output pressure change, the better. The lower the general output pressure, the smaller it will fluctuate with the change in output flow. Pressure adjustment procedure
Follow the steps below to slowly turn the adjustment screw to complete the setting. Improper adjustment operations may create water hammers or squeaks and may cause damage to the pressure reducing valve or other equipment.
(1) Closing the valve before and after closing the pressure reducing valve. Under the condition that the safety valve does not jump, open the bypass pipeline cut-off valve and keep enough time to complete the use of the circulating medium to purify the foreign matter or rust layer in the pipeline. . After the purge is complete, close the bypass line shut-off valve.
(2) Slowly open the cut-off valve installed in front of the pressure reducing valve, adjust the opening degree of the cut-off valve after adjusting the pressure reducing valve, and maintain a small flow rate through the pipeline.
(3) Loosen the lock nut, slowly turn the adjustment screw, and observe the pressure gauge behind the valve until the desired setting is reached (clockwise rotation pressure rise, counterclockwise rotation pressure drop). For models with handles, since the handle is in the self-locking position under normal conditions, when adjusting the pressure, first press the handle, release the self-locking, slowly turn the adjustment screw, and observe the pressure gauge near the valve until the request. The setting of the device until (clockwise rotation of the handle, the valve pressure increases; counterclockwise rotation of the handle, the pressure drop after the valve).
(4) Slowly open the pressure reducing valve and cut off the valve, and follow step (3) to further adjust the pressure of the valve until the desired setting is reached.
(5) After completing the adjustment, tighten the lock nut. For models with a handle, pull out the handle and lock it with the internal device; if the handle is not locked, turn the handle left and right to complete the self-locking action.
Pressure relief valve basic performance
The reducing valve uses the opening degree of the opening and closing member in the control valve body to regulate the flow of the medium, reduces the pressure of the medium, and at the same time regulates the opening degree of the opening and closing part by means of the pressure behind the valve, so that the pressure behind the valve Keeping within a certain range, maintaining the pressure of the outlet within the set range under the constant change of import pressure,
(1) Pressure regulation range: It refers to the adjustable range of the pressure relief valve output pressure P2. Within this range, the required accuracy is required. The pressure regulation range is mainly related to the stiffness of the pressure regulating spring.
(2) Pressure characteristics: It refers to the characteristic that the output pressure fluctuates due to input pressure fluctuation when the flow g is constant. The smaller the output pressure fluctuations, the better the relief valve characteristics. The output pressure must be lower than the input pressure - the set value does not change substantially with the input pressure.
(3) Flow characteristics: It refers to the input pressure - timing, output pressure changes with the change in the output flow g. When the flow g changes, the smaller the output pressure change, the better. The lower the general output pressure, the smaller it will fluctuate with the change in output flow.
[ Gas pressure reducing valve ] main technical parameters and performance indicators
Nominal pressure (Mpa)
1.6
2.5
4.0
6.4
10.0
16.0
Shell test pressure (Mpa)*
2.4
3.75
6.0
9.6
15.0
twenty four
Seal test pressure (Mpa)
1.6
2.5
4.0
6.4
10.0
16.0
High import pressure (Mpa)
1.6
2.5
4.0
6.4
10.0
16.0
Outlet pressure range (Mpa)
0.1-1.0
0.1-1.6
0.1-2.5
0.5-3.5
0.5-3.5
0.5-4.5
Pressure characteristic deviation (Mpa) â–³ P2P
GB12246-1989
Flow characteristic deviation (Mpa) P2G
GB12246-1989
Small pressure difference (Mpa)
0.15
0.15
0.2
0.4
0.8
1.0
Leakage
X/F ( polytetrafluoroethylene / rubber ) : OY ( hard seal ) : GB12245-1989
[ Gas pressure reducing valve ] Flow coefficient (Cv)
DN
15
20
25
32
40
50
65
80
100
125
150
200
250
300
350
400
500
Cv
1
2.5
4
6.5
9
16
25
36
64
100
140
250
400
570
780
1020
1500
Part Name
Part material
Valve body cover bottom cover
WCB/FCB*
Valve seat plate
2Cr13/304*
Cylinder liner
2Cr13/25 ( hard chrome plating )/304*
piston
2Cr13/ Copper Alloy / Copper Alloy *
Piston ring
Alloy Cast Iron / Parabene *
Pilot seat guide stem
2Cr13/304*
Diaphragm
1Cr18Ni9Ti
Main valve guide spring
50CrVA
Adjusting spring
60Si2Mn
Sealing pad (X/F model )
Rubber / Teflon
Pilot body pilot valve cover
25/304*
Nominal diameter DN
Shaped outer dimensions
L
H
Hl
1.6/2.5MPa
4.0MPa
15
160
180
290
90
20
160
180
300
98
25
180
200
300
110
32
200
220
300
110
40
220
240
320
125
50
250
270
320
125
65
280
300
325
130
80
310
330
365
160
100
350
380
365
170
125
400
450
475
200
150
450
500
475
210
200
500
550
515
240
250
650
560
290
300
800
705
335
350
850
745
375
400
900
780
405
450
900
730
455
500
950
835