Swagelok SS-BNV51-O 316L stainless steel high purity bellows sealed valves use a packless design and a welded seal to isolate system fluids and achieve reliable, leak-tight performance. Bellows valves are ideal for applications where the seal to atmosphere is critical, offering multiple options for general and high-purity service. This model features a straight pattern (2-way) flow, a normally open pneumatic actuator, and 1/4 in. female Swagelok VCR metal gasket face seal fittings.

Specifications

Specification	Value
Actuator Operation Mode	Normally Open Spring Return
Actuator Type	Pneumatic
Bellows Material	321 Stainless Steel
Body Material	316L Stainless Steel
Body Seal	None
Cleaning Process	Special Cleaning and Packaging (SC-11)
Connection 1 Size	1/4 in.
Connection 1 Type	Face Seal (Metal Gasket) Female VCR
Connection 2 Size	1/4 in.
Connection 2 Type	Face Seal (Metal Gasket) Female VCR
CV Maximum	0.3
Flow Pattern	Straight (2-way)
Gasket	None
Maximum Temperature, °F (°C)	200 (93)
Max Temperature Pressure Rating	200°F @ 400 PSIG / 93°C @ 27.5 BAR
Minimum Temperature, °F (°C)	-40 (-40)
Room Temperature Pressure Rating	400 PSIG @ 100°F / 27.5 BAR @ 37°C
Service Class	General
Stem Tip Material	PCTFE
Stem Type	Conical
Surface Finish	Ra 20 μin
Testing	Helium leak testing according to SCS-00020
eClass (4.1)	37010201
eClass (5.1.4)	37010201
eClass (6.0)	37010201
eClass (6.1)	37010201
eClass (10.1)	37010201
UNSPSC (4.03)	40141600
UNSPSC (10.0)	40141609
UNSPSC (11.0501)	40141609
UNSPSC (13.0601)	40141609
UNSPSC (15.1)	40141609
UNSPSC (17.1001)	40141600

Interchangeability

Do not mix/interchange Swagelok products or components not governed by industrial design standards, including Swagelok tube fitting end connections, with those of other manufacturers.