1.用途及特点：
用途：本阀适用于石油、化工、医药、能源、特殊液体等物料存储容器上，用以平衡容器内气压，防止容器内出现超高压或超真空，使容器遭受破坏，也有效防止容器内液体挥发、损耗。同时起到阻止外界火焰传入容器内，以免发生燃烧、爆炸的作用。

特点：
1．该阀集呼吸阀与阻火器于一体，安装本阀后无需再安装阻火器，保证使用性能同时节约成本。
2．性能可靠并有静电接地线，使阀与存储容器保持等电位，阻火装置位于呼吸阀入口处，彻底杜绝火源进入。
3．本阀结构紧凑、体积小、重量轻、通风量大、密封性能好、耐腐蚀。检修清洗方便。
2.性能规范：
环境温度（℃）：-30～+60
操作压力（Pa）: A级正压：355 Pa   负压：298 Pa
                B级正压：980 Pa   负压：295 Pa
                C级正压：1765 Pa  负压：295 Pa
防爆级别：BS5501：ⅡA、ⅡB、ⅡC
3. 执行标准：
SY 7511-87  《石油储罐呼吸阀》
GB5908-86  《石油储罐阻火性能和试验方法》
法兰执行标准： HG20592-97 

Use and features
  
Use: This valve is used for storage containers of material in the petroleum, chemical, pharmaceutical, energy sources, special liquid, etc., to balance the pressure in the container, prevent over high pressure or over high vacuum in the container, to damage the container, also effectively prevent liquid to volatilize and lose in the container. Meanwhile, stop flame outside to enter into the container, so as to avoid burning, explosion.
  
Features: 1. This valve integrate the respiration valve and flame arrester together, after the installation of the valve, no longer need to install flame arrester, guarantee the use of performance while cost saving.

2. Performance is reliable and with electrostatic grounding wire, keep the valve and storage container with equal potentials, flame arrester is located at inlet of respiration valve, stop the fire sources to enter thoroughly.

3. The structure of the valve is compact, small size, light weight, large ventilation volume, good sealing performance and corrosion resistance. Maintenance and cleaning are convenience.
Performance Specification

Environmental temperature（℃）：-30～+60
Operation pressure（Pa）:      Level A positive pressure：355 Pa   Negative pressure：298 Pa
                                                Level B positive pressure：980 Pa   Negative pressure：295 Pa
                                                Level C positive pressure：1765 Pa  Negative pressure：295 Pa

Anti-explosion level: BS5501：ⅡA、ⅡB、ⅡC
Implementation standards：

SY 7511-87 “Respiration valve of petroleum storage tank”

GB5908-86   “Flame resistant performance and test method of petroleum storage tank”

Flange implementation standards: HG20592-97