Overview
The Swagelok SS-3NBS4-G is a high-pressure needle valve engineered for severe-service applications requiring precise flow control. This 6000 PSI rated valve combines robust 316 stainless steel construction with a union bonnet design, delivering exceptional durability in demanding industrial environments. The ball-stem design and Grafoil packing ensure reliable, long-cycle operation across a wide temperature range from −65°F to +100°F.
Key Features
- 316 stainless steel body and bonnet resists corrosion and contamination
- Union bonnet construction enables quick maintenance and stem replacement
- Ball stem with Grafoil packing for repeatable throttling and minimal seat wear
- 1/4 inch Swagelok tube fitting connection (OD compression)
- Flow coefficient (Cv) of 0.35 for controlled, precise metering
- Compatible with fuel, oil, water, and compressed air media
Technical Specifications
| Part Number | SS-3NBS4-G |
| Manufacturer | Swagelok (Whitey Brand) |
| Maximum Working Pressure | 6000 psi |
| Body Material | 316 Stainless Steel |
| Bonnet Type | Union |
| Stem Type | Ball |
| Packing Material | Grafoil |
| Connection Type | 1/4″ Tube OD Compression |
| Flow Coefficient (Cv) | 0.35 |
| Temperature Range | −65°F to +100°F |
| Compatible Media | Fuel, Oil, Water, Air |
| Valve Operation | Manual |
Typical Applications
- Hydraulic system test points and instrumentation connections
- Pneumatic system flow control and pressure regulation
- High-pressure pump discharge lines
- Chemical injection and metering systems
- Fuel cell and specialty gas systems requiring precise throttling
Compatibility & Replacements
Compatible With
- Swagelok 1/4″ tube fittings and systems
- High-pressure fluid power circuits (hydraulic, pneumatic)
- Laboratory test benches and instrumentation manifolds
- Industrial gas and liquid metering applications
- OEM fluid systems rated for 6000 psi service
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The SS-3NBS4-G is a specific Swagelok model; cross-reference with legacy Whitey part numbers or equivalent severe-service union bonnet needle valves through Swagelok technical support.
Works With
- Swagelok brass, stainless steel, and exotic alloy tube fittings
- Swagelok manifold blocks and fluid system subplates
- Industrial pressure transducers and gauges (NPT adapters available)
- Standard hydraulic and pneumatic hose and tubing assemblies
