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Process Interface Valves (DBB)

Swagelok® Process Interface Valves (DBB)

Swagelok process interface valves enable a smooth transition from the process piping system to instrumentation in a single configuration, providing fewer potential leak points, lower installed weight, and a smaller space envelope.

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process interface valves dbb

Commonly used in the oil and gas, chemical and refining, and power generation markets, Swagelok process interface valves (double block and bleed valves) can be found at process piping installation points, in vents or drains, at chemical injection and sampling points, directly mounted to instruments, providing close coupling of instruments, providing double block and bleed isolation, or in extreme service applications.

Swagelok process valves have up to 75% lower installed weights and smaller footprints compared to assemblies featuring multiple valves and fittings, and they have fewer potential leak points. They also provide reduced installation time, reduced vibration stress, and reduced fugitive emissions (low emissions options per API 641, API 624, ISO 15848-1, ISO 15848-2 available), as are designs featuring materials listed in accordance with NACE MR0175/ISO 15156 for sour gas service. Integral Swagelok tube fitting connection options are also available.

The Swagelok family of process interface valves includes:

  • One-piece forged body valves (VB04 and VS04 series)
  • Three-piece bolted body valves (VS03 series)
  • Process monoflanges (MS series)
  • All-needle valves (VN01 series)

Double block and bleed valves are required for critical applications, such as oil, gas, and chemical refining industries. In addition to DBB valves and assemblies, single block and bleed, and block combinations are available. Block and bleed globe valve module options are also available.


Working PressuresClass 150 to class 2500, up to working temperatures listed below, in accordance with ASME B16.5: refer to product catalog for specific pressure ratings.
Working Temperatures –58 to 400°F (–50 to 204°C) for stainless steel and duplex valve assemblies
Refer to product catalog for specific temperature ratings
Sizes Available Include1, 1 1/2, and 2 in. (25, 38, and 50 mm) bore size—VS03 series
3/8 in. (9.5 mm) bore size—VS04 series
1/2 and 3/4 in. (14 and 20 mm) bore size—VB04 series

Process Interface Valves Catalogs

Locate detailed product information, including materials of construction, pressure and temperature ratings, options, and accessories.

Swagelok flow coefficient (C<sub>v</sub>) calculator for valves

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