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雙阻塞排放球閥（Double Block and Bleed）
雙阻塞排放球閥提供兩道閥座密封面及兩者之間的排放口，單一閥門即可隔斷下游與上游壓力並驗證腔體排空——這是計量、歧管與清管（pigging）作業所需的隔斷型式，可取代兩顆閥門加一段短管。系列涵蓋 2" 至 48"、Class 150 至 Class 2500，溫度範圍 -196°C 至 650°C，觸及低溫深冷與高溫用途。閥體、球體與閥座等級依 ASTM 指定（A105N、F316L、F51 雙相鋼），設計依 API 6D、BS 5351 與 ASME B16.34，防火依 API 607 與 API 6A，法蘭依 ASME B16.5/B16.47，測試依 API 598 與 API 6D。
屬於 球閥 系列
最後更新： 2026-11
系列規格
| Nominal valve connection size | 2" to 48" |
|---|---|
| Pressure class / nominal rating designation | Class 150 to Class 2500 |
| Pressure class / nominal rating designation | Class150 to Class2500 |
| Valve body material | ASTM A105N, ASTM A182 F316L, A182 F51 |
| Seat material | ASTM A182 F316L |
| Ball material | ASTM A105N, ASTM A182 F316L, A182 F51 |
| Stem material | A182 F51 |
| Service temperature range | -196°C to 650°C |
| Design standards | API 6D, BS5351, ASME B16.34 |
| Inspection and pressure-test standards | API 598, API 6D |
| Face-to-face dimensional standard | ASME B16.10, API 6D |
| Fire Safe Design | API 607, API 6A |
| End-flange dimensional standard | ASME B16.5, ASME B16.47 |
| forged dbb size range | 1/2" to 16" (DN15-DN400) |
| forged dbb pressure rating | 150LB to 2500LB |
| forged dbb connection ends | Flange, Butt Weld, Socket Weld |
| forged dbb operators | Lever, Gear, Electric, Pneumatic |
| forged dbb body materials | A105 (N), LF2, F304, F316, F51, F55 |
| forged dbb ball materials | A105 with ENP coating, F304, F304L, F316, F316L, F51, nickel-chromium alloy |
| forged dbb stem materials | 17-4PH, XM-19, F304, F316, F51 |
| forged dbb seat materials | PTFE, RPTFE, reinforced nylon (polyamide), nylon, PEEK |
| forged dbb design standards | API 6D, ASME B16.34, API 608, BS EN ISO 17292, ISO 14313 |
| forged dbb pressure temp standard | ASME B16.34 |
| forged dbb testing standards | API 598 |
| forged dbb flange ends | ASME B16.5 |
| forged dbb buttweld ends | ASME B16.25 |
| forged dbb socketweld ends | ASME B16.11 |
| forged dbb thread ends | ASME B1.20.1 |
| forged dbb fire safe design | API 607 |
| forged dbb design features | Full Bore or Reduced Bore, Emergency Sealant Injection, Cavity Pressure Self Relief, Blow-out Proof Stem, Anti-static Device |
| trunnion dbb structure standard | ISO 17292 |
| trunnion dbb variant temp range | -29°C to 150°C |
| trunnion dbb variant port | full bore |
| trunnion dbb optional materials | carbon steel ASTM A105, low temperature steel A350 Gr. LF2, Cr-Mo steel A182 Gr. F11, F22, stainless steel A182 Gr. F304, F304L, F316, F316L, F321, F347, alloy steel Alloy 20, super duplex A182 Gr. F51, F53, F55, aluminum bronze B148 C95500, C95600, C95800, nickel-copper alloy K400, K500, nickel-chromium alloy 600, nickel-molybdenum alloy B, C276, nickel-iron-chromium alloy 825, 625 |
| trunnion dbb leakage rate | ≤5×10^-10 Pa·m³/s |
| trunnion dbb sealing standard | API 598 Class IV |
| trunnion dbb pressure ratings | 150LB to 2500LB (PN16-PN420), 42MPa max for Class 2500 |
| trunnion dbb body ball materials | A182 F304, F316 stainless steel, F316L (low-carbon), F347 |
| trunnion dbb seat materials | RPTFE (reinforced PTFE), PEEK |
| trunnion dbb stem materials | A182 F6NM (martensitic stainless steel), nickel-chromium superalloy 718 |
| trunnion dbb body temp range | -29℃ to 427℃ |
| trunnion dbb seat temp range | -40℃ to 260℃ |
| trunnion dbb stem temp range | -196℃ to 650℃ |
| twin ball dbb size range | 2 to 36 Inch (DN50-DN900) |
| twin ball dbb pressure range | 150 LBS to 1500 LBS (PN16-PN240) |
| twin ball dbb design standards | API 6D, ASME B16.34, DIN 3357, EN 13709, GB/T 12237, BS 5351 |
| twin ball dbb face to face | API 6D, ASME B16.10, EN 558-1, DIN 3202, JIS B2002 |
| twin ball dbb flange ends | ASME B16.5 (2-24 Inch), ASME B16.47 Series A / B (26 Inch and above), EN 1092-1, BS 4504, DIN 2501 |
| twin ball dbb testing standards | API 598, API 6D, EN 12266-1, EN 1074-1, ISO 5208 |
| twin ball dbb body design | three-piece, split body, side entry design, cavity pressure self-relief, Reduced Port or Full Bore, Forged Steel or Cast Steel |
| twin ball dbb clamp hub ends | Clamp / Hub ends on request |
| api6d dbb design standard | API 6D, ASME B16.5 |
| api6d dbb size range | 24" (DN600) |
| api6d dbb pressure rating | Class 2500 |
| api6d dbb temp range | -46°C to +210°C |
| api6d dbb connection types | RF, RTJ, BW, SW |
| api6d dbb testing standards | API 6D, API 598, API 6FA, ISO 10497 |
| buttweld end | ASME B16.25 |
| fire safety | API607, API6A |
| Bonnet material | ASTM A105N |
| seat ring materials | A182 F51 |
| o ring | VITON |
| thrust washer | PTFE |
| bearing | PTFE+SS304 |
| gasket | SS304+Graphite |
| body cap | ASTM A105N |
訂購與文件
文件
請在詢問時一併說明您需要的文件組合——此結構的常見項目（材質證明、按所列檢驗標準的測試報告、尺寸圖）將於報價時確認並隨附供應。
報價
可直接報價的詢問應說明：公稱口徑與壓力額定、閥體與閥座材質偏好、端部連接、操作方式，以及含溫度的使用介質。本頁的典型值為基準參考範圍；具有約束力的數值於報價時確認。
樣品與供應
供應條件、訂購數量與交期按訂單議定——請在詢問時說明目的地國家與所需時程。
儲存與運輸
閥門儲存時應保護閥座與密封件免受紫外線、臭氧與變形影響，安裝前保留端面保護蓋；彈性體或 PTFE 閥座結構應避免長期戶外存放——閥座材料在陽光直射與冰凍條件下老化最快。
常見問題
雙阻塞排放球閥（double block and bleed）的報價詢問應包含哪些內容？
執行標準與壓力等級、公稱口徑、閥體與閥座材質、介質及溫度、目的地——缺失的資訊會在報價過程中確認。
雙阻塞排放球閥（double block and bleed）提供哪些口徑與壓力等級？
本頁面尚未公布該閥門經驗證的口徑與壓力等級範圍——適用於您工況的口徑與壓力等級會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。
雙阻塞排放球閥（double block and bleed）提供哪些閥體材質？
本頁面尚未公布該閥門經驗證的閥體材質範圍——適用於您工況的閥體材質會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。
請求雙阻塞排放球閥（Double Block and Bleed）報價
在此提交需求——可直接報價的詢問應說明適用標準與等級、口徑、材質、介質、溫度與目的地.
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準備提出較大量或非標準需求？ 雙阻塞排放球閥（Double Block and Bleed）詢價指南 說明應包含的內容、標準範圍與客製選項，以及應附上的文件。