CN102563201B - Device for eliminating leakage risk of gas gate valve online - Google Patents

Device for eliminating leakage risk of gas gate valve online Download PDF

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Publication number
CN102563201B
CN102563201B CN2012100334126A CN201210033412A CN102563201B CN 102563201 B CN102563201 B CN 102563201B CN 2012100334126 A CN2012100334126 A CN 2012100334126A CN 201210033412 A CN201210033412 A CN 201210033412A CN 102563201 B CN102563201 B CN 102563201B
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China
Prior art keywords
valve
valves
gas
pressure
nitrogen
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CN2012100334126A
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CN102563201A (en
Inventor
余洪勇
游同想
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SHANDONG HONGDA CHEMICAL CO Ltd
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SHANDONG HONGDA CHEMICAL CO Ltd
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Abstract

The invention relates to a device for eliminating leakage risk of a gas gate valve online. A nitrogen pipeline is connected on a pressure test port of the gas gate valve, and a three-valve group and a pressure gage are arranged on the nitrogen pipeline. The three-valve group consists of three valves, wherein the first valve is connected with the third valve in series; the second valve is connected between the first valve and the third valve through a three-way pipe; an inlet of the first valve is connected with the nitrogen pipeline; an outlet of the first valve is connected with the inlets of the second valve and the third valve; the outlet of the second valve is connected with the outside; the outlet of the third valve is connected with the pressure test port of the gas gate valve; and the pressure gage is connected between the first valve and the third valve through the three-way pipe. The invention has the beneficial effects that the device has simple structure, is convenient to use and is safe and reliable and as the pressure of the nitrogen is 0.2 Mpa, the device is 8000pa to 12000pa higher than gas pressure and is higher than the atmospheric pressure. If nitrogen is leaked to the direction of an opened device by a city gas fast opening-closing gate valve, employees cannot be harmed, and if the nitrogen is leaked to the direction where the gas comes by the city gas fast opening-closing gate valve, the gas cannot be damaged too much.

Description

The device of online elimination leakage risk of gas gate valve
Technical field
The invention belongs to the chemical industry equipment field, relate to a kind of device of online elimination leakage risk of gas gate valve.
Background technique
The MZ series " town gas fast opening and closing gate valve " that Yangquan Valves Co., Ltd. produces is the town gas special valve that develops with the unit consolidation such as Shanghai Gas Company, to fill up the blank new product of country, be the scientific and technological achievement that State Scientific and Technological Commission and former national Machinery Ministry are promoted to the whole nation, its technical performance is on the leading domestic level.
This series of valves is applicable to: the various dirty coal gas such as blast furnace gas, coke-stove gas, producer gas, water gas, oil gas reach the clean gas such as liquid gas, rock gas, mine gas.Be mainly used on the gas processed and City Gas Distribution pipe network of the industries such as coal gas, metallurgy, coking.The national market occupancy is more than 80%.
What but this product was carried out is the GB13027-92 standard, and gas allows leakage rate 30 * Dn mm3/s, and leakage rate is very important concerning the Large Diameter Pipeline valve, can be carcinogenic or poisoning because containing benzene, benzene DDGS, BaP and hydrogen sulfide etc. in coal gas.When the equipment on-line that is connected with this valve is uncapped oil removing or maintenance, can cause personal injury to the worker.
Summary of the invention
The present invention is in order to make up the deficiencies in the prior art, and a kind of device of online elimination leakage risk of gas gate valve simple in structure, esy to use, safe and reliable is provided.
The present invention is achieved through the following technical solutions:
The device of online elimination leakage risk of gas gate valve of the present invention, its special way is: the pressure testing mouth at gas gate valve connects nitrogen pipeline, three valve group and pressure gauges are installed on nitrogen pipeline, the valve group that three valve groups are comprised of three valves, wherein a valve is connected with three valves, two valves are connected between a valve and three valves by three-way pipe, one valve inlet connects nitrogen pipeline, one valve outlet port connects the entrance of two valves and three valves, two valve outlet ports connect extraneous, three valve outlet ports connect gas gate valve pressure testing mouth, and pressure gauge is connected between a valve and three valves by three-way pipe.
The invention has the beneficial effects as follows, simple in structure, esy to use, safe and reliable, because of nitrogen pressure 0.2 Mpa, higher than gas pressure 8000pa-12000pa and barometric pressure, if the town gas fast opening and closing gate valve leaks nitrogen to the device orientation of uncapping and can not damage the worker, if town gas fast opening and closing gate valve always coal gas direction leaks nitrogen and also can not cause much harm to coal gas, because of short leakage rate of time limited.
Description of drawings
Fig. 1 is structural representation of the present invention.
In figure, 1 one valves, 2 two valves, 3 three valves, 4 pressure gauges, 5 pressure testing mouths, 6 gas gate valves, 7 coke-stove gas imports, 8 coke-stove gas outlets, 9 double-flashboards, 10 nitrogen pipelines.
Embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.
The device of online elimination leakage risk of gas gate valve of the present invention, pressure testing mouth 5 at gas gate valve 6 connects nitrogen pipeline 10, three valve groups and pressure gauge 4 are installed on nitrogen pipeline, the valve group that three valve groups are comprised of three valves, wherein a valve 1 is connected with three valves 3, two valves 2 are connected between a valve and three valves by three-way pipe, one valve 1 entrance connects nitrogen pipeline 10, one valve outlet port connects the entrance of two valves 2 and three valves 3, two valve 2 outlets connect extraneous, three valve 3 outlets connect the pressure testing mouth 5 of gas gate valve 6, and pressure gauge 4 is connected between a valve and three valves by three-way pipe.
Generally gas pressure is 8000pa-12000pa; Factory's nitrogen pressure is generally 0.7Mpa; The flashboard of MZ series town gas fast opening and closing gate valve and the sealing between valve body are that (one of them flashboard is controlled coke-stove gas import 7 in double-flashboard 9 sealings, another flashboard is controlled coke-stove gas outlet 8), during the valve leak test, gas is inputted from the pressure testing mouth 5 between two flashboards, detected both sides sealing place and whether leak gas.
Pressure testing mouth at gate valve connects three valve group and pressure gauges, and three valve groups connect factory's nitrogen pipeline again, see accompanying drawing.
In three valve groups, valve 1 and valve 3 are normally closed, and valve 2 is often opened.
Operation is used: when the equipment that is connected when this gate valve will be taken off online lid and overhauls in short-term
A. this gas gate valve is closed;
B. slowly open a valve 1, allow nitrogen through a valve 1 and two valves 2 with pipeline in foreign material blow out, close two valves 2 after clean;
C. transfer a valve 1, make pressure gauge indication 0.2Mpa;
D. slowly open three valves 3;
If pressure drop E., then transfer a valve 1, make pressure gauge indication 0.2Mpa.
If the repair time is very long first by aforesaid operations (filling nitrogen between double-flashboard with), then town gas fast opening and closing gate valve and the 8 word blind plates of uncapping between Awaiting Overhaul equipment are extracted out, touched the pillow and insert and hold flange again.Finally nitrogen is shut.Awaiting Overhaul is over and will resumes production, and at first must extract 8 word blind plates out the insertion of touching the pillow again, for preventing gas leakage harm worker, and also by after aforesaid operations (filling nitrogen between double-flashboard with), the active 8 word blind plates of.

Claims (1)

1. the device of an online elimination leakage risk of gas gate valve, it is characterized in that: the pressure testing mouth at gas gate valve connects nitrogen pipeline, three valve group and pressure gauges are installed on nitrogen pipeline, the valve group that three valve groups are comprised of three valves, wherein a valve is connected with three valves, two valves are connected between a valve and three valves by three-way pipe, one valve inlet connects nitrogen pipeline, one valve outlet port connects the entrance of two valves and three valves, two valve outlet ports connect extraneous, three valve outlet ports connect gas gate valve pressure testing mouth, and pressure gauge is connected between a valve and three valves by three-way pipe;
The flashboard of gas gate valve and the sealing between valve body are the double-flashboard sealings, and one of them flashboard is controlled the coke-stove gas import, and another flashboard is controlled the coke-stove gas outlet;
In three valve groups, a valve and three valves are normally closed, and two valves are often opened;
Be exactly that nitrogen is inputted from the pressure testing mouth between two flashboards during leak test, detect both sides sealing place and whether leak gas;
When the equipment that is connected when this gas gate valve will be taken off online lid and overhauls in short-term, concrete steps were as follows:
A. this gas gate valve is closed;
B. slowly open a valve, allow nitrogen through a valve and two valves with pipeline in foreign material blow out, close two valves after clean;
C. transfer a valve, make pressure gauge indication 0.2MPa;
D. slowly open three valves;
If pressure drop E., then transfer a valve, make pressure gauge indication 0.2MPa.
CN2012100334126A 2012-02-15 2012-02-15 Device for eliminating leakage risk of gas gate valve online Active CN102563201B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012100334126A CN102563201B (en) 2012-02-15 2012-02-15 Device for eliminating leakage risk of gas gate valve online

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Application Number Priority Date Filing Date Title
CN2012100334126A CN102563201B (en) 2012-02-15 2012-02-15 Device for eliminating leakage risk of gas gate valve online

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CN102563201B true CN102563201B (en) 2013-11-13

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105674055A (en) * 2016-01-19 2016-06-15 康乃尔化学工业股份有限公司 Nitrogen valve group used for safety protection
CN107687535A (en) * 2016-11-10 2018-02-13 林之铠 A kind of gate valve for having hydraulic pressure indicator function

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2727508Y (en) * 2004-08-30 2005-09-21 邢台钢铁有限责任公司 Gas fan sealing device
CN2844860Y (en) * 2005-10-11 2006-12-06 济南钢铁股份有限公司 Online sweeping flowmeter pressure sampling tube device
CN2844888Y (en) * 2005-11-04 2006-12-06 攀枝花新钢钒股份有限公司 A kind of blast furnace gas dust sampling device
CN101550359A (en) * 2008-12-30 2009-10-07 湖北宜化化工股份有限公司 On-line valve pressurization method by steam
CN202469209U (en) * 2012-02-15 2012-10-03 山东洪达化工有限公司 Device for eliminating harm of leakage of gas gate valve on line

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2727508Y (en) * 2004-08-30 2005-09-21 邢台钢铁有限责任公司 Gas fan sealing device
CN2844860Y (en) * 2005-10-11 2006-12-06 济南钢铁股份有限公司 Online sweeping flowmeter pressure sampling tube device
CN2844888Y (en) * 2005-11-04 2006-12-06 攀枝花新钢钒股份有限公司 A kind of blast furnace gas dust sampling device
CN101550359A (en) * 2008-12-30 2009-10-07 湖北宜化化工股份有限公司 On-line valve pressurization method by steam
CN202469209U (en) * 2012-02-15 2012-10-03 山东洪达化工有限公司 Device for eliminating harm of leakage of gas gate valve on line

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