API · ASME · DIN · EN standard industrial valves
Double Block and Bleed Ball Valves
Double block and bleed ball valves give two seating surfaces and a bleed port between them, so a single valve can isolate downstream and upstream pressure and verify cavity Vent — the isolation pattern metering, manifold and pigging service asks for instead of two valves plus a spool. The series spans 2" to 48" and Class 150 to Class 2500 across -196°C to 650°C, a range that reaches cryogenic and high-temperature service. Body, ball and seat grades are specified by ASTM (A105N, F316L, F51 duplex), with design per API 6D, BS 5351 and ASME B16.34, fire safety to API 607 and API 6A, flanging per ASME B16.5/B16.47 and testing per API 598 and API 6D.
Part of the Ball Valves family
Last updated: 2026-11
Family specifications
| size range | 2" to 48" |
|---|---|
| pressure class | Class 150 to Class 2500 |
| pressure class | Class150 to Class2500 |
| body materials | ASTM A105N, ASTM A182 F316L, A182 F51 |
| body materials | ASTM A105N |
| seat materials | ASTM A182 F316L |
| ball materials | ASTM A105N, ASTM A182 F316L, A182 F51 |
| stem materials | A182 F51 |
| end connections | ASME B16.5, ASME B16.47 |
| temperature range | -196°C to 650°C |
| design standards | API 6D, BS5351, ASME B16.34 |
| testing standards | API 598, API 6D |
| face to face | ASME B16.10, API 6D |
| fire safe design | API 607, API 6A |
| 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 |
| seat ring materials | A182 F51 |
| o ring | VITON |
| thrust washer | PTFE |
| bearing | PTFE+SS304 |
| gasket | SS304+Graphite |
| body cap | ASTM A105N |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What standards govern the design and testing of double block and bleed ball valves?
The published specification for this family lists API 6D, BS5351, ASME B16.34 as the design standards. Testing follows API 598, API 6D.
What sizes and pressure ratings are available for double block and bleed ball valves?
The published size range is 2" to 48", and the published pressure ratings are Class 150 to Class 2500. Availability of a specific size and rating is confirmed at quotation.
What materials are double block and bleed ball valves available in?
The published specification lists body materials: ASTM A105N, ASTM A182 F316L, A182 F51. Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do double block and bleed ball valves cover?
The published working temperature range is -196°C to 650°C. For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What end connections do double block and bleed ball valves support?
The published specification lists ASME B16.5, ASME B16.47 as the available end connections. The connection for a specific size is confirmed at quotation.
What should a quotation inquiry for double block and bleed ball valves include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
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