DBB (Double Block & Bleed) Ball Valves – to Class 2500
J-VALVES DBB ball valves combine two sealing surfaces with a bleed port in one compact body, providing double block and bleed function for critical isolation. Ranges cover small-bore high-pressure designs from 1/2" in A105, LF2 and F316,Duplex Stainless Steel,Titanium alloy, Inconel alloy, Monel alloy, bronze alloy and other special materials up to Class 2500, flanged or threaded, per API 6D - typical applications include manifold, metering and injection points where single-valve isolation is not allowed
Product Category
Contact Us
-
Nominal Size: 4x3″ (DN100xDN80)
Pressure Class: 900LB (PN150)
Body Material: ASTM A350 LF2
Temperature Range: -29℃ to +425℃
Body / Side Body: ASTM A350 LF2
Ball: A351 CF8 (304 stainless steel) / CF8M (316 stainless steel), with ENP electroless nickel plating (standard) or Stellite (STL) alloy coating (for abrasive service)
Stem: A276 304 / 316 / 17-4PH, high strength at low temperatures
Seat: RPTFE (standard) / PEEK / Nylon / CF8M with STL hardfacing (metal seal)
Packing: PTFE V-type assembly / flexible graphite / special low-temperature graphite
Bolts: ASTM A320 L7 / L7M (low-temperature high-strength bolts, qualified for -100℃ impact test)
Nuts: ASTM A194 Gr.7 / 7M
Gasket: Spiral-wound gasket (316L / flexible graphite filled) / Ring Type Joint (RTJ, recommended for ultra-high pressure)
Flange Dimensions: ASME B16.5 compliant
Face-to-Face Dimension: ASME B16.10 compliant
DBB Bleed Port: A 1/2" or 3/4" NPT bleed valve is provided at the top or bottom of the valve body cavity, equipped with a plug or ball-type bleed device.
Operation: Manual (worm gear / lever), pneumatic (scotch-yoke / rack-and-pinion), electric (multi-turn / quarter-turn, intelligent type), hydraulic
Design Standards: ASME B16.34, API 608, API 6D
Test Standards: API 6D, API 598Brand:J-VALVES -
Nominal Size: 0.75″ × 0.5″ × 0.5″ (DN20 × DN15 × DN15)
Pressure Class: 1500LB (PN260)
Temperature Range: -29℃ to +425℃
Body / End Caps: ASTM A182 F316 (316 stainless steel); upgrade options available: F316L (low-carbon grade, resistant to intergranular corrosion) or F51 (duplex stainless steel, higher strength)
Ball: Solid F316, or F316 with ENP (electroless nickel plating) / hard chrome plating / tungsten carbide hardfacing
Stem: F316, 17-4PH precipitation-hardening stainless steel, or Inconel 718 (high strength for ultra-high pressure)
Seat Seal:RPTFE (glass fiber reinforced PTFE, -50℃ ~ 180℃).PEEK (-60℃ ~ 260℃).Devlon / Viton (for special chemical service conditions)
Packing: PTFE V-rings or flexible graphite reinforced with Inconel wire
Gasket: Flexible graphite stainless steel spiral wound gasket or metal ring joint gasket
Bolts: ASTM A193 B8M (316 stainless steel) or B7 (alloy steel), cadmium-plated / zinc-plated
End Connection: NPT female threaded (ASME B1.20.1), SW socket-welded (ASME B16.11), BW butt-welded (ASME B16.25)
Operation: Manual (lever / wrench with locking device); optional pneumatic (small cylinder) or electric actuator
Design Standards: ASME B16.34, API 608, API 6D
Testing Standards: API 598, API 6D
DBB Certification: Complies with API 6D Annex H and ISO 14313 DBB requirements
Face-to-Face Dimensions: In accordance with ASME B16.10Brand:J-VALVES -
Nominal Size: 0.75" × 0.5" (DN20 × DN15), reduced bore design
Pressure Class: Class 600 (PN100)
Temperature Range: -29℃ to +425℃
Body: Forged ASTM A182 F51 (2205 duplex stainless steel)
Ball: F51, with HVOF tungsten carbide coating or Stellite alloy hardfacing
Stem: F51, F316, 17-4PH stainless steel
Seat: RPTFE, Devlon, PEEK, metal seat (Stellite alloy hardfacing)
Packing: PTFE V-rings, pure graphite, low-emission composite packing
Bolts: B8M (316) or Inconel 718, resistant to hydrogen embrittlement and galvanic corrosion
Handle / Actuator: Stainless steel or duplex steel
End Connection: Threaded (NPT / BSP), Socket Weld (SW), Butt Weld (BW)
Operation: Manual (handle / mini gearbox), pneumatic (mini double-acting / spring return), electric (mini on-off type)
Design Standards: API 6D, ASME B16.34, API 608
Test Standards: API 6D, API 598
Face-to-Face Dimensions: ASME B16.10Brand:J-VALVES -
Nominal Size: 0.75" × 0.5" (DN20 × DN15)
Pressure Class: Class 900 (PN150)
Temperature Range: -29℃ to +425℃
Body: Normalized forged carbon steel ASTM A105N
Ball: A105N + ENP (Electroless Nickel Plating), F304, F316 stainless steel
Stem: F6a, F304, F316 stainless steel
Seat: RPTFE, Devlon, PEEK, metal seat (Stellite hardfacing)
Packing: PTFE V-rings, pure graphite, low-emission combined packing
Bolts: B7M / L7M, resistant to hydrogen embrittlement and stress relaxation
Handle / Actuator: Stainless steel or galvanized carbon steel
End Connection: Threaded (NPT / BSP), Socket Weld (SW), Butt Weld (BW)
Operation: Manual (lever / mini gearbox), pneumatic (mini double-acting / spring return), electric (mini on-off type)
Design Standard: API 6D, ASME B16.34, API 608
Testing Standard: API 6D, API 598
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Nominal Size: 1/2" × 1/2" (DN15 × DN15)
Pressure Class: Class 600 (PN100)
Temperature Range: -29℃ to +425℃
Body: Normalized forged carbon steel ASTM A105N
Ball: A105N + ENP (Electroless Nickel Plating), F304, F316 Stainless Steel
Stem: F6a, F304, F316 Stainless Steel
Seat: RPTFE, Devlon, PEEK, Metal Seat (Stellite hardfacing)
Packing: PTFE V-rings, Pure Graphite, Low-Emission Combined Packing
Bolts: B7M / L7M, resistant to hydrogen embrittlement and stress relaxation
Lever / Actuator: Stainless steel or carbon steel with galvanized finish
End Connection: Threaded (NPT / BSP), Socket Weld (SW), Butt Weld (BW)
Operation: Manual (Lever / Mini Gearbox), Pneumatic (Mini Double-Acting / Spring-Return), Electric (Mini On-Off Type)
Design Standard: API 6D, ASME B16.34, API 608
Test Standard: API 6D, API 598
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Nominal Size: 0.5" × 0.5" (DN15 × DN15)
Pressure Class: Class 600 (PN100)
Temperature Range: -29℃ to +425℃
Body: Normalized forged carbon steel ASTM A105N
Ball: A105N + ENP (Electroless Nickel Plating), F304, F316 stainless steel
Stem: F6a, F304, F316 stainless steel
Seat: RPTFE, Devlon, PEEK, metal seat (Stellite hardfacing)
Packing: PTFE V-rings, pure graphite, low-emission combined packing
Bolts: B7M / L7M, hydrogen embrittlement and stress relaxation resistant
Lever / Actuator: Stainless steel or carbon steel with galvanized finish
End Connection: Threaded (NPT / BSP), Socket Weld (SW), Butt Weld (BW)
Operation: Manual (lever / mini gearbox), pneumatic (mini double-acting / spring-return), electric (mini on-off type)
Design Standard: API 6D, ASME B16.34, API 608
Test Standard: API 6D, API 598
Emission Class: ISO 15848-1 Class BH (zero leakage)
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Nominal Size: 6" (DN150)
Pressure Class: Class 600 (PN100)
Temperature Range: -29℃ to +425℃
Body: Normalized forged carbon steel ASTM A105N
Ball: A5215 alloy steel (or A182 F22/F11 chrome‑molybdenum steel), surface treated with HVOF tungsten carbide coating or Stellite alloy hardfacing, hardness ≥ 60 HRC
Stem: A5215 alloy steel (or F6a/F316), surface nitrided or hard chrome plated
Seat: RPTFE / Devlon / Vespel soft seal + Inconel alloy / Stellite alloy metal seal
Bearing: PTFE + stainless steel, RPTFE self-lubricating, metal bearing (for high-pressure service)
Packing: PTFE V-rings, pure graphite, Inconel wire-reinforced graphite, low-emission composite packing
Bolts: B7M / L7M, resistant to hydrogen embrittlement and stress relaxation
Gearbox / Actuator: Cast steel, ductile iron, with manual override
End Connection: Flanged (RF / RTJ) or Butt Weld (BW)
Operation: Manual (gearbox), pneumatic (double-acting / spring return), electric (on-off / modulating), hydraulic, electro-hydraulic, emergency shutdown (ESD)
Design Standards: API 6D, ASME B16.34, API 608
Test Standards: API 6D, API 598
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Nominal Size: 3" × 2" (DN80 × DN50)
Pressure Class: Class 600 (PN100)
Temperature Range: -29℃ to +425℃
Body: Forged stainless steel ASTM A182 F316
Ball: F316, surface treated with HVOF tungsten carbide coating or Stellite alloy hardfacing, hardness ≥ 60 HRC
Stem: F316, 17-4PH precipitation hardening stainless steel, Inconel 718
Seat: RPTFE / Devlon / Vespel soft seal + Inconel alloy / Stellite alloy metal seal
Bearing: PTFE + stainless steel, RPTFE self-lubricating, metal bearing (for high-pressure service)
Packing: PTFE V-rings, pure graphite, Inconel wire-reinforced graphite, low-emission composite packing
Bolts: B8M CL.2 (316), Inconel 718 available for hydrogen embrittlement resistance
Gearbox / Actuator: Cast steel, stainless steel, with manual override
End Connection: Flanged (RF / RTJ) or Butt Weld (BW)
Operation: Manual (handle / gearbox), pneumatic (double-acting / spring return), electric (on-off / modulating), hydraulic, electro-hydraulic, emergency shutdown (ESD)
Design Standards: API 6D, ASME B16.34, API 608
Test Standards: API 6D, API 598
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Size Range: 2" to 48" (DN50 to DN1200)
Pressure Class: Class 600, 900, 1500, 2500 (PN100, PN150, PN250, PN420)
Temperature Range: -29℃ to +425℃
Body: A105, LF2, F304, F316, F51 (2205 Duplex Stainless Steel), F53 (2507 Super Duplex Stainless Steel), Inconel (for highly corrosive environments)
Ball: F304, F316, F51, F53, with HVOF tungsten carbide coating or Stellite alloy hardfacing
Stem: F6a, F304, F316, 17-4PH, Inconel 718
Seat: Soft seal in RPTFE/Devlon/Vespel + metal seal in Inconel alloy/Stellite alloy
Bearing: PTFE + stainless steel, RPTFE self-lubricating, metal bearing (for high-pressure and high-temperature services)
Packing: Pure graphite, low-emission graphite + PTFE composite, Inconel wire-reinforced graphite
Gearbox/Actuator: Cast steel, ductile iron, with manual override
End Connection: Flanged (RF/RTJ) or Butt Welded (BW)
Operation: Manual (gearbox), pneumatic (double-acting / spring return), electric (on-off / modulating), hydraulic, electro-hydraulic, emergency shutdown (ESD)
Design Standard: API 6D, ASME B16.34
Inspection & Test Standard: API 6D, API 598
Face-to-Face Dimension: ASME B16.10Brand:J-VALVES -
Size Range: 1/2″ to 48″ (DN15 to DN1200)
Pressure Rating: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -46℃ to +200℃(it varies depending on the specific materialand working conditions)
Materials:
Valve Body: Forged Steel (e.g., ASTM A105), Stainless Steel (e.g., 304, 316), Alloy Steel
Valve Ball: Hardened Stainless Steel or Alloy Steel
Valve Stem: Stainless Steel or Alloy Steel
Sealing Material: PTFE, RPTFE, Metal Seat
Connection Type: Flanged Connection (RF), Butt Weld Connection (BW)
Operation Mode: Manual (Handwheel Operation), Pneumatic, Electric
Design Standards: API 6D, ASME B16.34
Testing Standard: API 598
End-to-End Dimensions: Compliant with ASME B16.10 StandardBrand:J-VALVES - Size Range: 2″ to 4″ (DN50 to DN100)
Pressure Rating: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -46℃ to +200℃(it varies depending on the specific materialand working conditions)
Materials:
Valve Body: Forged Steel (e.g., ASTM A105), Stainless Steel (e.g., 304, 316), Alloy Steel
Valve Ball: Hardened Stainless Steel or Alloy Steel
Valve Stem: Stainless Steel or Alloy Steel
Sealing Material: PTFE, RPTFE, Metal Seat
Connection Type: Flanged Connection (RF)
Operation Mode: Manual (Handwheel Operation), Pneumatic, Electric
Design Standards: API 6D, ASME B16.34, API 608
Testing Standards: API 598
End-to-End Dimensions: Compliant with ASME B16.10 StandardBrand:J-VALVES - Size Range: 1/2″ to 2″ (DN15 to DN50)
Pressure Rating: 150LB to 2500LB (PN20 to PN420)
Temperature Range: -46℃ to +200℃(it varies depending on the specific materialand working conditions)
Materials:
Valve Body: Forged Steel (e.g., ASTM A105), Stainless Steel (e.g., 304, 316), Alloy Steel
Valve Ball: Hardened Stainless Steel or Alloy Steel
Valve Stem: Stainless Steel or Alloy Steel
Sealing Material: PTFE, RPTFE, Metal Seat
Connection Type: Flanged Connection (RF), Threaded Connection (NPT)
Operation Mode: Manual (Handwheel Operation), Pneumatic, Electric
Design Standards: API 6D, ASME B16.34, API 608
Testing Standard: API 598
End-to-End Dimensions: Compliant with ASME B16.10 StandardBrand:J-VALVES
DBB ball valves FAQ
Q1 What does DBB mean in valves?
Double Block and Bleed - two independent sealing surfaces block pressure from both sides while a bleed port between them vents trapped medium, for safe maintenance isolation.
Q2 What pressure classes do J-VALVES DBB valves reach?
Q3 Which standards apply?
