安全阀是锅炉、压力容器和其他受压力设备上重要的安全附件，应经常检查，使之安全可靠。其动作可靠性和性能好坏直接关系到设备和人身的安全，并与节能和环境保护紧密相关。而有的用户和设计部门在选型时，总是选错型号。为此本文对安全阀的选用加以分析
| （SV-B9L） BRONZE SAFETY RELIEF VALVE |
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| MODEL: | SV-B9A / SVP-B9A WITHOUT LEVER | | MODEL: | SV-B9L / SVP-B9L WITH LEVER | The features of low lift bronze safety valves for which the valve seat & disc are processed by lapping. The Disc can be replaced with PTFE for good effect of anti-leakage. （Model: SVP-B9A, SVP-B9L） When placing order, please indicate Working Pressure | Working Fluid : | Metal to Metal: Non-Corrosive Gas, Air, Steam. PTFE: l Non-corrosive Gas, Non-corrosive Liquid. l Air, Steam, Water, Oil. | | Working Temp: | -45℃～185℃ | | Working Pressure: | SV-B9A / SV-B9L : 0.3 ~ 10 Kgf/cm2 , 11 ~ 20 Kgf/cm2 SVP-B9A / SVP-B9L : 2 ~ 10 Kgf/cm2 , 11 ~ 20 Kgf/cm2（PTFE） | | Thread End: | BSPT （BS21）, NPT （ANSI B2.1） |
| MATERIAL: | | | No./ Parts | W/O Lever | SV-B9A SV-B9L | SVP-B9A SVP-B9L | | With Lever | | | Type : | METAL TO METAL | PTFE | | 1 | Valve Body | CAST BRONZE | CAST BRONZE | | 2 | Valve Seat | FORGE BRASS | FORGE BRASS | | 3 | Valve Disc | FORGE BRASS | FORGE BRASS | | 3-1 | Soft Seal | - | PTFE | | 4 | Spring | SWOSC-V | SWOSC-V | | 5 | Stem | BRASS | BRASS | | 6 | Cap | FORGE BRASS | FORGE BRASS | | 7 | Packing （B9A） | ASBESTOS | ASBESTOS | | 8 | Spring Seat | BsBM | BsBM | | 9 | Nut | BsBM | BsBM | | 10 | Adjusting Screw | BsBM | BsBM | | 11 | Handle （B9L） | STEEL | STEEL | |
