Swagelok SS-4BG-TW stainless steel bellows-sealed valve with gasketed spherical stem tip, 1/4 in. TSW and 3/8 in. TBW connections. This straight-through, manual actuated valve features a packless design and welded seals, isolating system fluids for reliable, leak-tight performance. Bellows valves are ideal for applications where an atmospheric seal is critical, offering options for general and high-purity conditions.

Specifications

Specification	Value
Actuator Type	Manual
Bellows Material	321 Stainless Steel
Body Material	316 Stainless Steel
Body Seal	Gasket with metal seat
Cleaning Process	Standard Cleaning and Packaging (SC-10)
Connection 1 Size	1/4 in.
Connection 1 Type	Tube Socket Weld
Connection 2 Size	3/8 in.
Connection 2 Type	Tube Butt Weld
Max Cv	0.36
Flow Pattern	Straight (2-way)
Gasket	Silver-plated 316 Stainless Steel Gasket
Handle Color	Green
Handle Type	Phenolic Round Handle
Max Temperature, °F (°C)	600 (315)
Max Temp Pressure Rating	600°F @ 400 PSIG / 315°C @ 27.5 BAR
Min Temperature, °F (°C)	-20 (-28)
Room Temp Pressure Rating	1000 PSIG @ 100 °F / 68.9 BAR @ 37°C
Service Class	General
Stem Tip Material	Cobalt-based alloy
Stem Type	Spherical
Surface Finish	Standard
Testing	Helium leak test in accordance with 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)	40183101

Product Selection and Compatibility

To ensure safe product selection, the overall 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 or components not governed by industrial design standards, including Swagelok tube fitting end connections, with those of other manufacturers.