Swagelok SS-3HNRS4 is a 316 stainless steel severe service high pressure needle valve engineered for reliable performance in high-pressure instrumentation and process systems. This straight-pattern valve features a robust union-bonnet construction and a regulating stem, offering a flow coefficient (Cv) of 0.35 and a 0.156 in. (4.0 mm) orifice. Equipped with 1/4 in. Swagelok tube fitting end connections, it ensures a secure, leak-tight seal essential for severe service environments.

Technical Specifications

Feature	Specification
Body Material	316 Stainless Steel
Stem Tip Material	316 Stainless Steel
Flow Pattern	Straight (2-way)
Stem Type	Regulating
Orifice	0.156 in
Cv Maximum	0.35
Handle Style	Aluminum Bar
Cleaning	Standard Cleaning and Packaging (SC-10)

Pressure and Temperature Ratings

This needle valve is designed to maintain integrity under extreme operating conditions:

• Room Temperature Pressure Rating: 10000 PSIG @ 100°F (689 BAR @ 37°C)
• Maximum Temperature Pressure Rating: 450°F @ 7435 PSIG (232°C @ 512 BAR)
• Temperature Range: -65°F to 450°F (-53°C to 232°C)

INFO

While this specific model is rated to 450°F (232°C), needle valves with union-bonnet construction are generally available in materials supporting working pressures up to 10000 psig (689 bar) and temperatures up to 1200°F (648°C) depending on the configuration.

Safety and System Integration

Selecting the correct valve requires consideration of the total system design to ensure safe, trouble-free performance. The system designer and user are responsible for verifying function, material compatibility, adequate ratings, and proper installation.

WARNING

Do not mix or interchange Swagelok products or components with those of other manufacturers, including tube fitting end connections, to maintain system integrity and safety.