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GTQ vent cap

GTQ vent cap

  • Model: GTQ-6P/GTQ-16P/GTQ-6C/GTQ-16C
  • Specification:DN50-DN250
  • Temperature:≤60ºC
  • Medium:automatic
  • Pressure:0.6~6.4MPa
  • Connection method:Flange
  • Driving method:automatic
  • Material:cast steel, stainless stee
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GTQ vent capOverview

The GTQ vent pipe/vent cap is an air exchange device installed on the vent nozzle of atmospheric or low‑pressure storage tanks. It consists of a rain cover, an insect screen, and a straight or elbow‑type housing, allowing free gas flow in/out of the tank due to liquid transfer or temperature changes, automatically balancing the pressure difference between the tank and the atmosphere, and preventing deformation or rupture caused by overpressure or vacuum. Its core purpose is to provide safe and efficient venting for atmospheric tanks such as water tanks, oil tanks, chemical tanks, and food tanks, with an optional flame arrestor layer to meet fire and explosion protection requirements.

Product Drawing of GTQ vent cap

GTQ vent capCharacteristic

1. Free venting for automatic pressure balance: Straight or elbow structure provides an unobstructed gas passage, automatically balancing tank pressure without moving parts, ensuring high reliability.

2. Rain and dust protection design: Top rain cover prevents rain, dust, and debris from entering the tank; optional insect screen prevents insects and birds from entering.

3. Optional flame arrestor function: Can be equipped with a stainless steel corrugated flame arrestor layer to prevent external flames from entering the tank through the vent pipe, meeting fire protection codes.

4. Large venting capacity with low pressure drop: Large flow cross‑sectional area minimizes gas flow resistance, meeting venting requirements during rapid filling and discharging.

5. Multiple corrosion‑resistant materials: Housing available in carbon steel, stainless steel, aluminum alloy, or plastic (UPVC/PP) to suit various media such as water, oil, chemicals, and outdoor environments.

6. Simple structure with easy installation and maintenance: Standard flange or threaded connections for easy installation; removable rain cover and insect screen for convenient cleaning, low maintenance cost.

7. Wide application range: Suitable for vent piping of atmospheric tanks in water treatment, petrochemical, food and beverage, environmental protection, and other industries.

8. Compliant with relevant standards: Designed and manufactured according to SH/T 3007 “Design specification for tank farm of petrochemical storage and transportation system” and other standards.

GTQ vent capstructure principle

Structure Diagram of GTQ vent cap

Component name and material


阀体材料 (Valve Body Material)Carbon steel WCB, stainless steel 304,316
阻火芯件材料 (Fire Retardant Core Material)Stainless steel explosion-proof and fire-resistant corrugated plate
密封件材料 (Sealing Component Material)PTFEOil-resistant asbestos rubber, PTFE
环境温度℃ (Ambient Temperature ℃)≤480
公称压力(MPa) (Nominal Pressure (MPa))0.6~5.0
防爆级别 (Explosion-proof Grade)BS5501:ⅡA、ⅡB、ⅡC


GTQ vent captechnology parameter

Performance Specification Table

项目 Item技术参数 Specification
产品型号
Model
GTQ type tank top flame arrester breather
公称通径
Nominal DN
DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN350, DN400, DN500
公称压力
Nominal Pressure
PN0.6MPa, PN1.0MPa, PN1.6MPa
设计压力
Design Pressure
Atmospheric venting, opening pressure: ±300 Pa; pressure test: 0.2 MPa hydraulic test without leakage
适用介质
Working Medium
Crude oil, gasoline, diesel, kerosene, various light/heavy oils, and volatile chemical media
工作温度
Working Temp
-35℃ ~ +480℃
连接方式
Connection
Flange connection (HG/GB standard flanges), butt welding optional
执行标准
Standard
SY/T0525.4, GB50160 Petrochemical Fire Protection Design Code
产品用途
Function
Tank pressure-associated venting, flameproofing and explosion suppression, tank pressure balancing, and reduction of oil evaporation loss. Adapted for installation on the tops of fixed-roof or internal floating-roof tanks; can be used independently or in conjunction with breathing valves.
阻火性能
Fire Resistance
The flame arrestor element is burn-rated and explosion-proof, complying with fire safety specifications for petroleum storage tanks.


GTQ vent capstandard size

GTQ vent cap of Outline Drawing

Outline dimension table

GB、JB国标法兰连接外形尺寸:


规格model尺 寸size
HLDD1D2nd
DN100273280ф205ф170ф145418
DN150367390ф260ф225ф200818
DN200472510ф315ф280ф255818
DN250572628ф370ф335ф3101218
DN300635660ф395ф435ф4051218

Due to the rapid R&D iteration speed of valve products from China kaiweixi Valve Group Co., Ltd., the above technical parameters and specification documents, including product overview, features, parts materials, outline dimension charts, CAD drawings, and product instruction manuals, are for your reference only. For actual applications, please contact our valve sales engineers to obtain the support you need for free. Thank you!