DBB Valves Information

DBB valve is a "single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of venting/bleeding the cavity between the seating surfaces. double block and bleed valves (dbb’s) in accordance with ANSI/ASME B.16.34. Variations of these instrument double block and bleed valves include sampling probe and chemical injection.

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Technical Specifications:

♦ DBB valve size are Available: 1/2” up to 3”

♦ Ratings: ANSI 150-2500 lbs

♦ Bore size from 3/8'' up to 2″


♦ Reduced bore / full bore design

♦ Soft seated / Metal seated design

♦Side Entry / Top Entry / Welded body design

♦ Valve ends / Valve operators

♦ Floating / trunnion mounted design

♦ SPE / DPE / Body cavity relief features

♦ DBB / DIB / Extended bonnet / weld overlay

♦ Anti-static / Fire safe design / Sealant Injection

♦ Seat insert materials / O-rings / Lip seals

♦ Special Requirement for ESD Valve &

♦ Lifting & supporting requirements

General Specifications:

♦ DBB Valve design as per ASME B16.34. Individual 100% pressure testing ensures safety. If the DBB valves are to be used for gas, oxygen or any other special application, please give full details when ordering with temperature and pressure. Other metallic finish on request. Are also manufactured in stainless steel, Brass and other material upon request.

♦ Including NACE MR-01-75 (latest revision). 

Applicable Standards for DBB Valve:

♦ Design Std. – API 6D / ISO 14313 / BS EN 17292

♦ Testing Std. – API 6D / API 598 / BS 6755 Part I

♦ Fire testing – As per API 6FA, API 607, ISO 10497 or BS 6755 Part II.

♦ Dimensional Std. – ASME B16.10 / API 6D


Specifications/standards given in the following table are followed for threaded & Flanged end.


End Connection

Reference Specifications


ASME B1.20.1, SAE AS71051

 ISO/BSP Parallel

ISO 228

ISO/BSP Tapered

ISO 7, BS EN 10226-1

SAE (Unified)


Flanged End

ASME – B16.5, DIN and JIC flanges available.