ZBA21系列外螺纹微启式安全阀
Spring Low Lift External Thread Safety Valve for small pressure equipment and pipelines requiring compact overpressure protection. Key selection data include DN15-DN25, PN16, PN25, PN40, PN64 and PN100 for A21H/W; PN16, PN25 and PN40 for A21F, A21H/W: up to 200 deg C; A21F: up to 80 deg C, materials, connection standard and set pressure.
最终整定压力、认证泄放量、材质代号及连接标准须以经批准的参数表为准，并在采购前予以确认。.
- 口径范围：DN15-DN25
- 压力等级：A21H/W 为 PN16、PN25、PN40、PN64 和 PN100；A21F 为 PN16、PN25 和 PN40
- 温度：A21H/W：最高 200°C；A21F：最高 80°C
- 连接：外螺纹进口/出口
- 介质：空气、氨气、石油气、腐蚀性气体或液体、液化气体及石油气，取决于 H/W/F 配置
- 图纸、测试记录和材质文件均按所订购配置确认。.
技术参数与选型数据
产品型号
ZBA21H/ZBA21W-16/25/40/64/100 C/P/R；ZBA21F-16/25/40 C/P/R
尺寸范围
DN15-DN25
压力等级
A21H/W 适用 PN16、PN25、PN40、PN64 和 PN100；A21F 适用 PN16、PN25 和 PN40
温度范围
A21H/W：最高 200°C；A21F：最高 80°C
适用介质
空气、氨气、石油气、腐蚀性气体或液体、液化气及石油气，具体取决于 H/W/F 配置
连接类型
外螺纹进口/出口
标准与合规
安全阀设计、性能及试验参考遵循 GB/T 12241、GB/T 12242 和 GB/T 12243；适用时，型号编制遵循 JB/T 308 阀门型号编制方法。.
工程解析：型号逻辑与应用边界
型号代码： A21 = 外螺纹连接、微启式弹簧结构安全阀。H/W/F 表示密封面或材料配置；压力数字表示 PN 压力等级；C/P/R 表示阀体材料代码。.
典型应用： 需要紧凑型超压保护的小型压力设备及管道
排量审查： 主要连接尺寸列于源目录页面。排量及流道尺寸应根据整定压力、介质、温度及适用规范进行确认。.
本产品系列不应仅依据型号、公称尺寸或压力等级进行选型。请确认泄放工况、所需泄放量、整定压力、操作裕量、温度、背压及实际连接标准。.
尺寸与选型指南
The table below is transcribed from catalog page 15. Verify critical dimensions against the approved order drawing before fabrication or piping release.
| 型号 | 公称通径（DN） | do | d | DO | M | d1 | D1 | L | L1 | Approx. H |
|---|---|---|---|---|---|---|---|---|---|---|
| A21H/W/F-16/25/40C/P/R | 15 | 12 | 15 | 20 | M27x1.5 | G1/2" | 30 | 35 | 74 | |
| A21H/W/F-16/25/40C/P/R | 20 | 16 | 20 | 25 | M33x1.5 | G3/4" | 34 | 40 | 87 | |
| A21H/W/F-16/25/40C/P/R | 25 | 18 | 25 | 31 | M39x1.5 | G1" | 44 | 52 | 100 | 105 |
| A21Y/W-64/100C/P/R | 15 | 10 | 15 | 25 | M36x1.5 | G1" | 44 | 52 | 100 | 105 |
| A21Y/W-64/100C/P/R | 20 | 10 | 20 | 31 | M39x1.5 | G1" | 44 | 52 | 100 | 105 |
| A21Y/W-64/100C/P/R | 25 | 12 | 25 | 31 | M42x1.5 | G1" | 44 | 52 | 100 | 105 |
RFQ checklist
询价清单：型号或阀门类型、DN/NPS、PN/Class、整定压力、泄放介质、工作温度、阀体及内件材质、进出口连接标准、阀帽/杠杆/先导选项、数量、图纸、证书及检验要求。.
Failure Analysis, Manufacturing Evidence and Quality Control
Common misapplication risks: incorrect thread or connection standard, insufficient certified relieving capacity, unsuitable body or trim material, operating pressure too close to set pressure, unreviewed back pressure, and installation loads transferred to the valve.
Material review: body materials: WCB carbon steel, ZG15Cr1Mo alloy steel, ZG15Cr1Mo1V/ZG20Cr1Mo1V high-temperature alloy steel, CF8/304, CF8M/316 or CF3M/316L according to model body code and service. Trim and internals: 20Cr13, 304, 316, 316L or alloy trim according to body code and medium; corrosive or high-temperature service can use stainless or alloy internals. Spring and stem: 50CrVA spring for standard service; stainless or coated fluoroplastic/304 spring options for corrosive service where specified.
Testing and inspection: Set pressure calibration, shell strength test, seat tightness/leakage test, reseating/blowdown check, dimensional inspection and material verification can be supplied according to the confirmed standard and order requirements.
Source and scope: product data is based on Zobai Safety Valve Product Catalog.pdf, catalog page 15. Project compliance remains subject to the approved datasheet, drawing, calculation and controlled certificates for the ordered configuration.
Review material traceability, type-test scope 和 project certificate requirements.
Related Products
常见问题
Safety Valve FAQs
本ZBA21外螺纹微启式安全阀页面涵盖哪些型号？
ZBA21H/ZBA21W-16/25/40/64/100 C/P/R；ZBA21F-16/25/40 C/P/R
应确认哪些尺寸、压力和温度数据？
规格：DN15-DN25。压力：A21H/W 为 PN16、PN25、PN40、PN64 和 PN100；A21F 为 PN16、PN25 和 PN40。温度：A21H/W：最高 200°C；A21F：最高 80°C。请确认所选型号的确切组合。.
该产品系列可处理哪些介质？
根据 H/W/F 配置的不同，适用于空气、氨、石油气、腐蚀性气体或液体、液化气体及石油气。实际流体成分和温度需审查材料及密封相容性。.
产品目录中的尺寸表能否用于最终制造？
仅用于初步审查。在管道或设备制造前，请根据批准的订单图纸确认关键尺寸、连接细节和方向。.
询价单（RFQ）中应包含哪些内容？
询价清单：型号或阀门类型、DN/NPS、PN/Class、整定压力、泄放介质、工作温度、阀体及内件材质、进出口连接标准、阀帽/杠杆/先导选项、数量、图纸、证书及检验要求。.