Swagelok SS-3NBVCR4 is a stainless steel severe service union bonnet needle valve designed for demanding industrial applications requiring high pressure and temperature resistance. This valve features a 0.35 Cv flow coefficient and 1/4 inch male VCR metal gasket face seal connections on both the inlet and outlet. Constructed from 316 stainless steel, it utilizes a ball stem with a cobalt-based alloy tip for reliable shutoff and a straight-through flow pattern.

Specifications

Attribute	Value
Body Material	316 Stainless Steel
Connection 1/2 Size	1/4 in.
Connection 1/2 Type	Face Seal (Metal Gasket) Male VCR
Cv Maximum	0.35
Flow Pattern	Straight (2-way)
Handle Style	Aluminum Bar
Orifice	0.156 in (3.9 mm)
Stem Tip Material	Cobalt Based Alloy
Cleaning Process	Standard Cleaning and Packaging (SC-10)

Pressure and Temperature Ratings

Condition	Rating
Room Temperature Pressure Rating	6000 PSIG @ 100°F (413 BAR @ 37°C)
Maximum Temperature	450°F (232°C)
Max Temp Pressure Rating	4130 PSIG @ 450°F (284 BAR @ 232°C)
Minimum Temperature	-65°F (-53°C)

Design Features

Needle valves with union-bonnet construction are engineered for safety and durability in severe service. This design allows for working pressures up to 10000 psig (689 bar) and temperatures up to 1200°F (648°C) within the broader product family, depending on materials and configuration.

• Union-Bonnet Construction: Provides robust stem seal integrity.
• Ball Stem: Features a hard cobalt-based alloy tip for longevity.
• Straight Pattern: Ensures direct flow path for efficient operation.

System Safety

When selecting products, the total system design must be considered to ensure safe, trouble-free performance. Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user. Do not mix or interchange Swagelok products with those of other manufacturers.

Identification Codes

• UNSPSC (15.1): 40141602
• eClass (10.1): 37010203