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
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Size Range： 2 to 24 inch (DN50 to DN600)
Pressure Class： ASME Class 150, 300, 600, 900, 1500, 2500
Isolation Grade： DBB, DIB-1 (two DPE seats), DIB-2 (one DPE, one SPE)
Body Style： Two piece, three piece, fully welded
Bleed Connection： 1/2 or 3/4 inch NPT with needle valve and pressure gauge
Cavity Relief： Thermal relief valve, drain port, or relieving seat carrier
Body Material： WCB, LCC, CF8M, A105, F316
Ball： A105 with ENP, or F316 hard chrome
Seat： RPTFE, PEEK, nylon; DPE or SPE; metal seated available
End Connection： Flanged RF / RTJ, butt weld
Design Standard： API 6D, ISO 14313, ASME B16.34
Fire Safe： API 607 / API 6FA available
Operation： Lever, gear, pneumatic, electricBrand:J-VALVES -
Size Range： 1/2 to 24 inch (DN15 to DN600)
Pressure Class： ASME Class 150 to 2500 / PN20 to PN420
Configuration： DBB, DIB-1 or DIB-2, stated on the order
Seat Arrangement： Single piston upstream, double piston downstream for DBB; double piston both seats for DIB-2
Bleed Port： 1/2 inch NPT standard, 1/4 inch NPT on instrument sizes
Body Material： WCB, WCC, CF8M, F316, F51 duplex, LF2
Ball: F316 / CF8M, hard chrome or ENP plated
Seat: PTFE, RPTFE, PEEK or metal seated
Design Standard： API 6D, ASME B16.34, ISO 14313
Test Standard： API 598 / API 6D seat test, ISO 5208 rate A
Fire Safe： API 607 and API 6FA available
Sour Service： NACE MR0175 on request, 22 HRC maximum
Operation： Lever, gear, pneumatic or electricBrand: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: 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: 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?
