Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

QZF-89 all-weather fire and explosion proof breathing valve
ZFQ explosion-proof flame arrester breathing valve
GFQ All‑Weather Breather Valve
HX and HXF-1 dual-nozzle breathing valve
HX2 and HXF2 dual-connection flame arrester breather valves
HX3 and HXF3 breathing valves with suction connection
HX-4 and HXF-4 flame arrester breathing valves with dual connection pipes
HX5 and HXF5 single exhaust valves
HX6 and HXF6 single exhaust valves
HX7 and HXF7 flame arrester single exhaust valves with pipe connection
HX8 and HXF8 flame arrester single intake valves with pipe connection
QHXF-89 all-weather breathing valve
GHF-1 Explosion-Proof Fire-Safe Breather Valve
FZT-1 flame arrester vent cap
XYXA breathing manhole
GTQ vent pipe
ZHQ-I gravel flame arrester
ZGB-II drawer type corrugated flame arrester
ZGB-III threaded flame arrester
ZGB-1 tank corrugated flame arrester
GZW-1 deflagration type pipeline flame arrester
HGS07 pipeline wire mesh flame arrester
FPB gas flame arrester
TGK type light-transmitting manhole
GRK type tank wall manhole
GLY-150 foot-operated gauging hatch
Air foam generator
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Phone：+86（577）6730 7899
Mobile：+86 1815 7711 652
Fax：+86（577）6738 7099
Email：merry@kaiweixi.com
Address：No. 1, Linxia Road, Oubei Street, Yongjia County, Wenzhou City, Zhejiang Province,china
Website：https://www.kaiweixi.com

Breathing valve

A breathing valve (also known as a pressure/vacuum relief valve) is a specialized safety valve installed on the top of storage tanks. Its core function is to automatically regulate the internal pressure of the tank, preventing damage caused by overpressure or vacuum, while significantly reducing medium evaporation losses. It requires no external energy source and operates solely on the pressure differential between the inside and outside of the tank.Internally, the breathing valve consists of two mechanisms: a pressure relief valve (exhalation) and a vacuum relief valve (inhalation). When the pressure inside the tank rises above the set point of the pressure relief valve, the pressure valve opens to discharge excess gas into the atmosphere. When the pressure inside the tank drops below the set point of the vacuum relief valve, the vacuum valve opens to allow external air into the tank for pressure compensation. Under normal conditions, both valves remain closed, effectively preventing medium evaporation and escape.Breathing valves are categorized into:All-weather type (with flame arrester to prevent lightning-induced fires)Pressure-only / vacuum-only type (provides either positive pressure or negative pressure protection)Type with connection pipe (directs exhaled gas to a recovery system)The breathing valves produced by Kaivex are widely used on various fixed-roof storage tanks in industries such as petroleum, chemical, and food. Selection must be based on the tank design pressure, medium characteristics (toxicity, corrosiveness), breathing capacity (gas flow rate caused by filling/emptying and thermal effects), and set pressure (typically 80% of the vessel design pressure).

QZF-89 all-weather fire and explosion proof breathing valve

Model：
QZF-89-6C/QZF-89-16C/QZF-89-6P/QZF-89-16P
Specification：
DN50-DN300
Pressure：
0.6MPA -1.6MPA
Material：
cast steel stainless steel

The QZF-89 all-weather fireproof and explosion-proof breather valve is a safety protection device installed on the top of fixed roof tanks containing flammable and explosive liquids, integrating pressure/vacuum automatic regulation, flame arrestor, and explosion-proof functions. When the tank pressure exceeds the set value, the pressure disc opens to release excess gas; when the tank vacuum reaches the set value, the vacuum disc opens to admit air; the built-in flame arrestor layer effectively prevents external flames from entering the tank, stopping fire spread. This valve is primarily used for breathing protection of flammable and explosive liquid storage tanks (such as gasoline, benzene, alcohols, etc.) in petroleum, chemical and other industries. Its core purpose is to automatically balance tank pressure while providing fire and explosion protection, ensuring safe tank operation and compliance with environmental and fire safety regulations.QZF-89 all-weather fire and explosion proof breathing valve product diagram

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ZFQ explosion-proof flame arrester breathing valve

Model：
ZFQ-6/ZFQ-16/ZFQ-6P/ZFQ-16P
Specification：
DN25-DN250
Pressure：
0.6MPA-1.6MPA
Material：
cast iron, aluminum alloy, stainless steel

ZFQ explosion-proof flame retardant breathing valve is a safety protection device installed on the top of a fixed top storage tank for flammable and explosive liquids, integrating pressure/vacuum automatic adjustment and flame retardant function. When the pressure or vacuum degree inside the tank exceeds the set value, the positive pressure valve disc or negative pressure valve disc automatically opens to balance the internal and external pressure difference; At the same time, the built-in fire-resistant layer can effectively prevent external flames from entering the tank and prevent the spread of fire. This valve is mainly used for respiratory protection of flammable and explosive liquid storage tanks (such as gasoline, benzene, alcohols, etc.) in industries such as petroleum and chemical. Its core purpose is to automatically adjust the tank pressure while blocking flame propagation, ensuring the safe operation of the tank and complying with explosion-proof and fire prevention regulations.Product Drawing of ZFQ explosion-proof flame arrester breathing valve

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GFQ All‑Weather Breather Valve

Model：
GFQ-6/ GFQ-10/ GFQ-16/GFQ-6P/ GFQ-10P/ GFQ-16P
Specification：
DN25-DN300
Pressure：
0.6Mpa-16Mpa
Material：
cast iron, aluminum alloy, stainless steel

GFQ all-weather breathing valve is an automatic pressure balancing device installed on the top of a fixed top storage tank. It achieves intelligent regulation of the pressure inside the tank and atmospheric pressure through the independent action of the positive pressure valve disc and negative pressure valve disc. When the pressure inside the tank rises to the set opening pressure, the positive pressure valve disc opens and releases excess gas outward; When the pressure inside the tank drops to the set vacuum pressure, the negative pressure valve disc opens and sucks in external air, effectively preventing the tank from deforming or breaking due to overpressure or excessive vacuum. The valve adopts an all-weather rainproof and dust-proof structure, suitable for respiratory protection of various liquid storage tanks.GFQ All‑Weather Breather Valve product diagram

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HX and HXF-1 dual-nozzle breathing valve

Model：
HX-6C/HX-20C/HXF-1-6C/HXF-1-20C/HX-6P/HX-20P/HXF-1-6P/HXF-1-20P
Specification：
DN25-DN250
Pressure：
0.6-2.0Mpa
Material：
cast steel, aluminum alloy, stainless steel

The HXF-1 two-nozzle flame arrestor breather valve is a two-way breather valve installed on the top of fixed roof tanks, featuring two external piping connections (two nozzles) and integrating pressure relief, vacuum intake, and flame arrestor functions. When the tank pressure exceeds the set value, the pressure disc opens to discharge volatile gases through the flame arrestor and one nozzle to a recovery or treatment system; when vacuum occurs inside the tank, the vacuum disc opens to introduce protective gas (e.g., nitrogen) or air through the other nozzle to maintain pressure balance. This valve is primarily used for tank blanketing and centralized venting systems. Its core purpose is to achieve controlled排放 of tank breather vapors and safe gas intake, while the built-in flame arrestor prevents external flame ingress, meeting environmental, safety, and explosion-proof code requirements.HX and HXF-1 dual-nozzle breathing valve product diagram

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HX2 and HXF2 dual-connection flame arrester breather valves

Model：
HX2-16/HX2-25/HX2-16P/HX2-25P/HXF2-16/HXF2-25/HXF2-16P/HXF2-25P
Specification：
DN40-DN400
Pressure：
1.6Mpa-2.5Mpa
Material：
cast steel,aluminium alloy, stainless steel

The HX double-nozzle breather valve is a two-way breather valve installed on the top of fixed roof tanks, featuring two external piping connections and integrating pressure relief, vacuum intake, and flame arrestor functions. When the tank pressure exceeds the set value, the pressure disc opens to discharge volatile gases through the flame arrestor and one nozzle to a recovery or treatment system; when vacuum occurs inside the tank, the vacuum disc opens to introduce protective gas (e.g., nitrogen) or air through the other nozzle to maintain pressure balance. This valve is primarily used for tank blanketing and centralized venting systems. Its core purpose is to achieve controlled排放 of tank breather vapors and safe gas intake, while preventing external flame ingress, meeting environmental, safety, and explosion-proof code requirements.HX2 and HXF2 dual-connection flame arrester breather valves product diagram

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HX3 and HXF3 breathing valves with suction connection

Model：
HX3-16C/HX3-25C/HX3-16P/HX3-25P/HXF3-16/HXF3-25/HXF3-16P/HXF3-25P
Specification：
DN50～DN500
Pressure：
1.6MPa～2.5MPa
Material：
cast steel, aluminum alloy, stainless steel

The HX3/HXF3 breathing valve with suction connection is a bidirectional breathing valve installed on the top of a fixed top storage tank. It is equipped with an independent suction connection (which can be connected to nitrogen or other protective gases) and an exhalation channel, integrating positive pressure exhalation, negative pressure safety air supply, and fire prevention functions. When the pressure inside the tank is higher than the set value, the positive pressure valve disc opens, and volatile gases are discharged into the atmosphere or recovery system through the flame retardant layer; When negative pressure is generated inside the tank, the negative pressure valve disc opens, and protective gas (such as nitrogen) or air is introduced through the suction pipe to quickly replenish the pressure inside the tank. This valve is mainly used for nitrogen sealing protection and safety ventilation system of storage tanks. Its core purpose is to automatically supplement dry inert gas through suction connection when the tank is discharged or the temperature drops sharply, preventing air from entering the tank and forming explosive mixtures. At the same time, it has overpressure relief and flame retardant functions, ensuring the safety of the storage tank and the quality of the medium.HX3 and HXF3 breathing valves with suction connection product diagram

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HX-4 and HXF-4 flame arrester breathing valves with dual connection pipes

Model：
HX4-16/HX4-25/HX4-16P/HX4-25P/HXF4-16/HXF4-25/HXF4-16P/HXF4-25P
Specification：
DN25-DN250
Pressure：
0.6Mpa-2.5Mpa
Material：
cast iron, aluminum alloy, stainless steel

HX-4 and HXF-4 models are equipped with double-tube (fire-resistant) breathing valves. is a one-way pressure-relief breather valve installed on the top of fixed roof tanks, integrating set-pressure relief and flame arrestor function with an external piping connection. When the tank pressure rises to the set opening pressure, the disc automatically opens to safely release excess gas through the flame arrestor layer to an external pipeline; when the pressure falls below the set value, the valve remains tightly closed, preventing external air or flame from entering. This valve is primarily used for controlled venting and safety protection of flammable, explosive, and toxic media (such as benzene, alcohols, oil vapors, etc.) in storage tanks. Its core purpose is to direct tank vapors through the connected piping to a recovery or treatment system while preventing external flame ingress, meeting both environmental emission and fire/explosion protection requirements.HX-4 and HXF-4 flame arrester breathing valves with dual connection pipes product diagram

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HX5 and HXF5 single exhaust valves

Model：
HX5-16/HX5-25/HX5-16P/HX5-25P/HXF5-16/HXF5-25/HXF5-16P/HXF5-25P
Specification：
DN50～DN500
Pressure：
1.6MPa～2.5MPa
Material：
cast iron, aluminum alloy, stainless steel

The HX5/HXF5 single breather valve is a one-way pressure-relief breather valve installed on the top of fixed roof tanks, allowing tank gas to vent outward only when overpressure occurs, while remaining tightly closed when the tank pressure is below the set value. This valve features standard flange connections for piping to a recovery system or direct atmospheric discharge, and an optional built-in flame arrestor is available. Its core purpose is to automatically release excess gas during tank filling or temperature rise to prevent overpressure deformation, while reducing media evaporation loss. It is suitable for tanks that are insensitive to vacuum or already equipped with independent gas intake devices (such as nitrogen blanketing systems).HX5 and HXF5 single exhaust valves product diagram

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HX6 and HXF6 single exhaust valves

Model：
HX6-16/HX6-25/HX6-16P/HX6-25P/HXF6-16/HXF6-25/HXF6-16P/HXF6-25P
Specification：
DN50～DN250
Pressure：
1.6MPa～2.5MPa
Material：
cast iron, aluminum alloy, stainless steel

The HX6/HXF6 single breather valve is a one-way pressure-relief breather valve installed on the top of fixed roof tanks, featuring a large flow path design optimized for high venting capacity requirements. When the tank pressure exceeds the set value, the pressure disc automatically opens to release excess gas; it reseals tightly when pressure returns to normal. The valve can be optionally equipped with a built-in flame arrestor and features standard flange connections for piping to a recovery system or direct atmospheric discharge. Its core purpose is to achieve efficient, set-pressure venting during rapid tank filling, high ambient temperature, or nitrogen purging conditions that generate large volumes of volatile gases, preventing overpressure deformation while reducing media evaporation loss. It is suitable for tanks that are insensitive to vacuum or already equipped with independent gas intake devices.HX6 and HXF6 single exhaust valves product diagram

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HX7 and HXF7 flame arrester single exhaust valves with pipe connection

Model：
HX7-16/HX7-25/HX7-16P/HX7-25P/HXF7-16/HXF7-25/HXF7-16P/HXF7-25P
Specification：
DN50-DN500
Pressure：
1.6MPa～2.5MPa
Material：
cast iron, aluminum alloy, stainless steel

The HXF7 nozzle flame arrestor single breather valve is a one-way pressure-relief breather valve installed on the top of fixed roof tanks, integrating set-pressure relief and flame arrestor function with an external piping connection. When the tank pressure rises to the set opening pressure, the disc automatically opens to safely release excess gas through the flame arrestor layer to an external pipeline; when the pressure falls below the set value, the valve remains tightly closed, preventing external air or flame from entering. This valve is primarily used for controlled venting and safety protection of flammable, explosive, and toxic media (such as benzene, alcohols, oil vapors, etc.) in storage tanks. Its core purpose is to direct tank vapors through the connected piping to a recovery or treatment system while preventing external flame ingress, meeting both environmental emission and fire/explosion protection requirements.HX7 and HXF7 flame arrester single exhaust valves with pipe connection product diagram

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HX8 and HXF8 flame arrester single intake valves with pipe connection

Model：
HX8-16/HX8-25/HX8-16P/HX8-25P/HXF8-16/HXF8-25/HXF8-16P/HXF8-25P
Specification：
DN50-DN250
Pressure：
1.6MPa～2.5MPa
Material：
cast iron, aluminum alloy, stainless steel

The HX8/HXF8 single intake valve with nozzle (flame arrestor) is a one-way vacuum-breaker breather valve installed on the top of fixed roof tanks, specifically designed for vacuum intake protection. This valve features an external piping connection (with nozzle). When the tank vacuum exceeds the set value, the vacuum disc automatically opens to introduce blanketing gas (such as nitrogen) or air through the nozzle, rapidly restoring tank pressure; the valve closes tightly when normal pressure returns. An optional built-in flame arrestor prevents external flame propagation. Its core purpose is to automatically and controllably admit gas during tank discharging, emptying, or sudden temperature drops to prevent tank collapse or deformation, while avoiding direct intake of moist air or contaminants. It is suitable for vacuum-sensitive tanks requiring centralized gas supply.HX8 and HXF8 flame arrester single intake valves with pipe connection product diagram

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QHXF-89 all-weather breathing valve

Model：
QHXF-89/QHXF-89C/QHXF-89P
Specification：
DN50-DN250
Pressure：
正压353Mpa-980Mpa
Material：
cast iron, aluminum alloy, stainless steel

The QHXF-89 all-weather breather valve is an automatic pressure balancing device installed on the top of fixed roof storage tanks. It independently operates the pressure disc and vacuum disc to intelligently regulate the pressure difference between the tank interior and the atmosphere. When the tank pressure rises to the set opening pressure, the pressure disc opens to release excess gas; when the tank vacuum reaches the set value, the vacuum disc opens to admit external air, effectively preventing tank deformation or rupture due to overpressure or excessive vacuum. This valve is primarily used for breathing protection of various liquid storage tanks (such as oil products, chemical solvents, water treatment, etc.) . Its core purpose is to automatically balance the pressure difference inside and outside the tank during filling, discharging, or ambient temperature changes, reducing media evaporation loss and ensuring tank structural safety and environmental compliance.QHXF-89 all-weather breathing valve product diagram

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GHF-1 Explosion-Proof Fire-Safe Breather Valve

Model：
GHF-1-6C/GHF-1-10C/GHF-1-16C
Specification：
DN80 ~ DN250
Pressure：
0.6Mpa-1.6Mpa
Material：
carbon steel

GHF-1 explosion-proof and fire-resistant breathing valve is a safety protection device installed on fixed top storage tanks for flammable and explosive liquids, integrating pressure/vacuum automatic adjustment and fire prevention functions. When the pressure or vacuum degree inside the tank exceeds the set value, the positive pressure valve disc or negative pressure valve disc automatically opens to balance the pressure difference inside and outside the tank; The built-in flame retardant layer (corrugated board flame retardant core) can effectively prevent external flames from entering the tank and prevent the spread of fire. This valve meets the requirements of explosion-proof and fire prevention regulations and is a key supporting equipment for ensuring safe operation and reducing medium volatilization loss in petroleum and chemical storage tank areas.GHF-1 Explosion-Proof Fire-Safe Breather Valve product diagram

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FZT-1 flame arrester vent cap

Model：
FZT-1-16P
Specification：
DN100-DN150
Pressure：
1.6MPA
Material：
stainless steel

The FZT-1 flame arrestor vent cap is an integrated flame arresting and venting device installed on the vent ports of small tanks, fuel oil tanks, or high points of pipelines. It features a built-in stainless steel corrugated plate flame arrestor element, allowing free gas flow in and out of the tank due to pressure changes (breathing) while effectively preventing external flame ingress. Its core purpose is to provide combined flame arrestor protection and atmospheric venting for small tanks in petroleum, chemical, gas stations, generator fuel tanks, small solvent storage tanks, and day tanks , maintaining tank pressure balance while preventing backfire explosions, suitable for venting applications with limited installation space requiring explosion protection. FZT-1 flame arrester vent cap product drawing

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XYXA breathing manhole

Model：
XYXA-500C/XYXA-600C/XYXA-500P/XYXA-600P
Specification：
DN500-DN600
Pressure：
0.6-2.0Mpa
Material：
cast steel, stainless steel

The XYXA breather manhole is an integrated device combining a manhole cover and a breather valve installed on the top of fixed roof tanks, integrating tank access, automatic pressure regulation, and flame arrestor functions. Under normal conditions, when the tank pressure exceeds the set value, the breather disc automatically opens to release excess gas; when vacuum occurs, it admits air to maintain pressure balance. Meanwhile, the manhole cover can be opened when needed to provide entry for operators to inspect or clean the tank. This device is primarily used for safe venting and personnel access in petroleum, chemical, and other industrial storage tanks. Its core purpose is to replace traditional separate breather valves and manholes, providing automatic tank pressure regulation to prevent overpressure/vacuum damage while offering safe and convenient access for tank entry operations, with built-in flame arrestor to prevent external flame ingress.XYXA breathing manhole product diagram

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GTQ vent pipe

Model：
GTQ-6P/GTQ-16P/GTQ-6C/GTQ-16C
Specification：
DN50-DN250
Pressure：
0.6～6.4MPa
Material：
cast steel, stainless steel

The GTQ type vent pipe is an air exchange device installed on the top of atmospheric or low-pressure storage tanks, allowing free flow between the tank vapor space and the atmosphere. When the tank is filled or emptied, or when pressure fluctuations occur due to ambient temperature changes, the vent pipe automatically balances the pressure difference between the tank interior and the atmosphere, preventing tank deformation or rupture due to overpressure or vacuum. This vent pipe is typically equipped with a rain cover, insect screen, or flame arrestor. Its core purpose is to provide safe and efficient venting for atmospheric storage tanks such as water tanks, oil tanks, chemical tanks, and food tanks, ensuring that the tank remains at atmospheric pressure during normal operation and environmental changes, thereby protecting tank structural integrity and media quality.Product Drawing of GTQ vent pipe

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ZHQ-I gravel flame arrester

Model：
HGS07-203-6C/HGS07-203-10C/HGS07-203-25C/HGS07-203-6P/HGS07-203-10P/HGS07-203-25P
Specification：
DN50-DN150
Pressure：
1.6Mpa
Material：
cast steel, stainless steel

The ZHQ-I gravel flame arrester is a flame arrestor safety device that uses gravel (quartz sand, ceramic balls, or metal balls) as the flame arresting medium. It is installed on tank breather piping, vent systems, or flammable gas pipelines. The interior is filled with a layer of gravel of a certain particle size, and the small gaps between the gravel particles form flame arresting channels. When flame passes through, heat is rapidly absorbed and dissipated, extinguishing the flame, thereby preventing external flame propagation into the tank or downstream equipment. This flame arrester features a simple structure, high corrosion resistance, and large flow capacity. Its core purpose is to provide reliable flame arrestor protection for breather valves and vent pipes in petrochemical storage tanks, oil depots, gas stations, etc., especially suitable for applications with particulate matter or easily polymerized media to prevent clogging of the gravel channels.

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ZGB-II drawer type corrugated flame arrester

Model：
ZGB-II-16/ZGB-II-16C/ZGB-II-16P
Specification：
DN50-DN500
Pressure：
1.6MPa
Material：
cast iron, cast steel, stainless steel

The ZGB-II drawer-type corrugated plate flame arrester is a flame arrestor safety device installed on tank vent piping, relief systems, or vapor recovery lines. It adopts a drawer-type structure in which the stainless steel corrugated plate flame arrestor element is modularly installed inside the housing. The element quenches flames through the narrow gaps of the corrugated channels, effectively preventing external flame propagation into the tank. The drawer design allows the entire flame arrestor element to be pulled out for cleaning, replacement, and maintenance without disassembling the housing. Its core purpose is to provide reliable flame arrestor protection for breather valves, single relief valves, and nitrogen blanketing systems in petrochemical storage tanks, while significantly reducing maintenance difficulty and downtime, meeting fire and explosion protection codes for tank farms.Product Drawing of ZGB-II drawer type corrugated flame arrester

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ZGB-III threaded flame arrester

Model：
ZGB-III-16/ZGB-III-25/ZGB-III-16C/ZGB-III-25C/ZGB-III-16P/ZGB-III-25P
Specification：
DN15-200
Pressure：
1.6-2.5MPa
Material：
cast iron, cast steel, stainless steel

The ZGB-III threaded flame arrester is a small-bore flame arrestor safety device with threaded connections, installed on flammable gas vent lines, instrument air piping, or small tank breather lines. It features an internal stainless steel corrugated plate flame arrestor element, utilizing the tiny gaps between the corrugated plates to quench flames, effectively preventing external flame propagation to upstream equipment or tanks. This flame arrester offers a compact structure and convenient installation. Its core purpose is to provide reliable flame arrestor protection for instrument vent systems, small storage tanks, gas pipeline branches, and laboratory gas lines, suitable for small-bore DN15 to DN50 pipelines requiring explosion-proof flame arresting.Product Drawing of ZGB-III threaded flame arrester

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ZGB-1 tank corrugated flame arrester

Model：
ZGB-1-6C/ZGB-1-64C/ZGB-1-6P/ZGB-1-64P
Specification：
DN50-DN250
Pressure：
0.6～PN6.4MPa
Material：
cast iron, cast steel, stainless steel

The ZGB-1 tank corrugated plate flame arrester is a flame arrestor safety device installed on the vent piping or breather valve outlet of flammable and explosive liquid storage tanks. It adopts stainless steel corrugated plate as the flame arrestor element, quenching flames through the narrow gaps of the corrugated channels to effectively prevent external flame propagation into the tank. This flame arrester features high flame arresting efficiency, low pressure drop, corrosion resistance, and easy maintenance. Its core purpose is to be installed on the inlet/outlet piping of tank breather valves, single relief valves, or nitrogen blanketing systems, preventing tank vapors from being ignited by lightning, static electricity, or external ignition sources, thereby ensuring the intrinsic safety of storage tanks during normal breathing and emergency relief, and meeting fire and explosion protection codes for petrochemical tank farms.Product Drawing of ZGB-1 tank corrugated flame arrester

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GZW-1 deflagration type pipeline flame arrester

Model：
GZW-64C/GZW-64P/GZW-16C/GZW-16P
Specification：
DN50-DN250
Pressure：
0.6～6.4MPa
Material：
carbon steel, stainless steel

The GZW-1 deflagration type pipeline flame arrester is a safety device installed on pipelines carrying flammable and explosive gases, specifically designed to prevent the propagation of subsonic flames (explosive combustion) within the pipeline. It employs a stainless steel corrugated plate flame-retardant core that utilizes the microporous gaps in the corrugated channels to quench the flame, confining it to one side of the pipeline and preventing its spread to downstream equipment or storage tanks. This extinguisher is suitable for applications where combustible gases may be present in the pipeline and the flame propagation speed is below the speed of sound. Its primary use is in oil vapor recovery lines, venting systems, fuel gas pipelines, or ventilation ducts; it blocks flame propagation during accidental combustion, safeguarding upstream and downstream equipment, personnel, and the environment while complying with fire and explosion prevention regulations in industries such as petrochemicals and gas transmission and distribution.Product Drawing of GZW-1 deflagration type pipeline flame arrester

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HGS07 pipeline wire mesh flame arrester

Model：
HGS07-25/HGS07-25/HGS07-25C/HGS07-40C/HGS07-25P/HGS07-40P
Specification：
DN50-DN250
Pressure：
0.6MPa～6.4MPa
Material：
cast steel, stainless steel

The HGS07 pipeline wire mesh flame arrester is a safety device installed on pipelines carrying flammable and explosive gases, specifically designed to prevent the propagation of subsonic flames (explosive combustion) within the pipeline. It employs a stainless steel corrugated plate flame-retardant core that utilizes the microporous gaps in the corrugated channels to quench the flame, confining it to one side of the pipeline and preventing its spread to downstream equipment or storage tanks. This extinguisher is suitable for applications where combustible gases may be present in the pipeline and the flame propagation speed is below the speed of sound. Its primary use is in oil vapor recovery lines, venting systems, fuel gas pipelines, or ventilation ducts; it blocks flame propagation during accidental combustion, safeguarding upstream and downstream equipment, personnel, and the environment while complying with fire and explosion prevention regulations in industries such as petrochemicals and gas transmission and distribution.Product Drawing of HGS07 pipeline wire mesh flame arrester

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FPB gas flame arrester

Model：
FPB-16P/FPB-32P/FPB-40P/FPB-16C/FPB-32C/FPB-40C
Specification：
DN15-DN200
Pressure：
1.6Mpa-4MPa
Material：
cast steel, stainless steel

The FPB gas flame arrester is a flame arrestor safety device installed on gas transmission and distribution pipelines, specifically designed to prevent flame propagation in combustible gas pipelines. It features an internal stainless steel corrugated plate flame arrestor element, utilizing the tiny gaps between the corrugated plates to quench flames, effectively preventing backfire explosions. This flame arrester can be configured as deflagration or detonation type to suit various pipeline lengths and installation locations. Its core purpose is to be installed on natural gas, LPG, coal gas pipelines at regulator station outlets, customer inlets, burner supply lines, and vent systems, blocking flame propagation during accidental backfire to protect downstream equipment, personnel, and the environment.Product Drawing of FPB gas flame arrester

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TGK type light-transmitting manhole

Model：
TGK-500A/TGK-500B/TGK-500C/TGK-500D
Specification：
DN500-DN750
Pressure：
1.6MPA
Material：
cast steel, stainless steel

The GRK tank wall manhole is a personnel access and inspection opening installed on the lower or middle sidewall of storage tanks. It features an elliptical or circular structure, with the flange welded directly to the tank shell. The manhole cover is equipped with a hinge, handwheels, and fastening devices, allowing quick opening when needed for operators to enter the tank for cleaning, inspection, maintenance, or replacement of internal equipment. Its core purpose is to provide a safe and convenient man-entry access for fixed roof tanks, floating roof tanks, and other large storage tanks in petroleum, chemical, and storage/transportation industries , while maintaining tight sealing after closure with gaskets and fasteners to prevent media leakage and ingress of external contaminants.TGK type light-transmitting manhole product drawing

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GRK type tank wall manhole

Model：
TGK-500A/TGK-500B/TGK-500C/TGK-500D
Specification：
DN500-DN750
Pressure：
1.6MPA
Material：
cast steel, stainless steel

The GRK tank wall manhole is a personnel access and inspection opening installed on the lower or middle sidewall of storage tanks. It features an elliptical or circular structure, with the flange welded directly to the tank shell. The manhole cover is equipped with a hinge, handwheels, and fastening devices, allowing quick opening when needed for operators to enter the tank for cleaning, inspection, maintenance, or replacement of internal equipment. Its core purpose is to provide a safe and convenient man-entry access for fixed roof tanks, floating roof tanks, and other large storage tanks in petroleum, chemical, and storage/transportation industries , while maintaining tight sealing after closure with gaskets and fasteners to prevent media leakage and ingress of external contaminants.GRK type tank wall manhole product drawing

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GLY-150 foot-operated gauging hatch

Model：
GLY-150P/GLY-150C
Specification：
DN100-DN150
Pressure：
1.6MPA
Material：
cast steel, stainless steel

The GLY-150 foot-operated dip hatch is a specialized measuring hatch installed on the top of storage tanks, featuring a foot-operated opening mechanism that allows operators to open the cover automatically by stepping on a foot lever or pedal for measuring liquid level, temperature, and taking oil samples. The product includes a dipping guide tube, sealing structure, and dust cover to effectively prevent vapor leakage and external contaminants from entering the tank. Its core purpose is to provide a convenient and safe access for liquid level measurement and sampling of storage tanks in industries such as petroleum, chemical, oil depots, and gas stations , reducing labor intensity of manual cover opening while preventing vapor loss and safety hazards associated with frequent manual opening. Product Drawing of GLY-150 foot-operated gauging hatch Rotary gauging hatch

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Air foam generator

Model：
PC4/PC8/PC16/PC25
Specification：
Φ130-Φ225
Pressure：
0.2～0.5MPa
Material：
cast iron, cast steel

The air foam maker is a fixed foam fire extinguishing device installed on storage tanks or oil pools. It draws in air and thoroughly mixes the foam concentrate solution with air to produce a certain expansion ratio of air foam, which is then discharged onto the burning liquid surface to achieve extinguishment by coverage. Its core purpose is to provide low or medium expansion foam fire protection for flammable liquid storage tanks (such as crude oil, gasoline, alcohols, chemical solvents, etc.) . During a fire, it rapidly generates a large volume of foam to cut off oxygen, suppress vaporization, cool the surface, prevent fire spread, and effectively extinguish tank fires.Product Drawing of Air foam generator

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Product classification of Kaiweixi

KAI WEI XI CHAN PIN FEN LEI

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GLY-150 foot-operated gauging hatch

Air foam generator

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