Swagelok SS-4H-V51 is a stainless steel bellows sealed valve designed to isolate system fluids and achieve reliable, leak-tight performance. Utilizing a packless design and a welded body seal, this valve is ideal for applications where a secure seal to the atmosphere is critical, such as in general or high-purity service environments.

Performance and Design

The valve features a straight (2-way) flow pattern and is manually actuated via a green aluminum knob handle. The internal bellows is constructed from 321 stainless steel, while the body is made from durable 316 stainless steel. It is equipped with 1/4 in. butt-welded female VCR metal gasket face seal connections for both ports.

Technical Specifications

Feature	Detail
Actuator Type	Manual
Bellows Material	321 Stainless Steel
Body Material	316 Stainless Steel
Body Seal	Welded
Cleaning Process	Special Cleaning and Packaging (SC-11)
Connection Size	1/4 in.
Connection Type	Butt-Welded Female VCR Metal Gasket Face Seal
Cv Maximum	0.28
Maximum Temperature	600°F (315°C)
Pressure Rating at Max Temp	600°F @ 1000 PSIG / 315°C @ 68.9 BAR
Room Temperature Pressure Rating	1000 PSIG @ 100°F / 68.9 BAR @ 37°C
Stem Tip Material	S17400 Stainless Steel
Stem Type	Conical
Testing	Helium leak testing according to SCS-00020

Safety and Selection

Proper installation, operation, and maintenance are critical for safe performance. System designers must consider material compatibility and adequate ratings. Swagelok components should not be mixed or interchanged with products from other manufacturers to ensure system integrity.