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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Nominal Size： 3/4 x 1/2 inch (DN20 x DN15), reduced bore
Pressure Class： ASME Class 600 / PN100, 102.1 bar at 38°C
Body Material： ASTM A182 F51 forged duplex, UNS S31803
PREN： Approximately 35
Ball： F51 with HVOF tungsten carbide or Stellite overlay
Stem： F51, SS316 or 17-4PH, blowout proof
Seat： RPTFE, Devlon, PEEK, or Stellite faced metal
Bolting： B8M Class 2, alloy 718, or B7M for sour service
End Connection： NPT, BSP, socket weld ASME B16.11, butt weld ASME B16.25
Bleed Port： Cavity bleed with plug or needle valve, lockable option
Service Temperature： -29°C to +300°C, seat dependent
Design Standard： API 6D, API 608, ASME B16.34
Test Standard： API 598, ISO 5208, cavity test through bleed port
Sour Service： NACE MR0175 availableBrand:J-VALVES -
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 -
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 -
Nominal Size： 1/2 inch x 1/2 inch (DN15 x DN15)
Pressure Class： ASME Class 600 (PN100), about 10.2 MPa at 38°C
Temperature Range： -29°C to +425°C
Body Material： ASTM A105N normalized forged carbon steel
Ball： A105N + ENP, F304 or F316
Seat： RPTFE, Devlon, PEEK, or metal seat with Stellite
Stem： F6a, F304 or F316, anti blowout
Packing： PTFE V rings or pure graphite, low emission
Bleed Port： 1/4 inch NPT plugged, or needle valve
End Connection： Threaded NPT / BSP, socket weld, butt weld to ASME B16.25
Design Standard： API 6D, ASME B16.34, API 608
Test Standard： API 6D, API 598, each seat tested separately
Emission Class： ISO 15848-1 Class BH
Operation： Lever, mini gearbox, mini pneumatic or electric actuatorBrand:J-VALVES -
A forged F316 three port valve at Class 1500 with a three quarter inch inlet and two half inch ports, and a bleed into the cavity that has to be proved by test rather than by description.Brand:J-VALVES -
A one piece forged A105N valve with a trunnion ball, two double piston effect seats and a bleed into the cavity, at a class held by two taper threads.Brand:J-VALVES -
A two ball trunnion valve from Class 600 to 2500 where the cavity between the balls is the working part, and the seats decide whether it can be used.Brand:J-VALVES -
A half inch Class 600 double block and bleed valve with two balls in one forged body, judged by what the order and the certificate actually cover.Brand:J-VALVES
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A three by two inch Class 600 stainless double block and bleed valve where the cavity count, not the seat count, is the specification.Brand: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?
