Swagelok SS-1RS4 Integral Bonnet Needle Valve
Overview
The Swagelok SS-1RS4 is a stainless steel integral-bonnet needle valve from Swagelok’s widely specified O, 1, 18, 20, 26, and D series, built for precise on/off shutoff and fine flow regulation in instrumentation, sampling, and process control tubing systems. With a 0.37 Cv regulating-stem trim and 1/4 in Swagelok tube fitting end connections, the SS-1RS4 is one of the most commonly stocked needle valves on instrumentation panels, sample systems, and analyzer skids across process plants worldwide, valued for a live-loaded packing design that maintains a reliable seal through repeated cycling.
As the official trusted supplier and regional supplier for Swagelok, Seven Star LLC proudly supplies the SS-1RS4 integral-bonnet needle valve to instrumentation engineers, EPC contractors, and plant maintenance teams across the Sultanate of Oman and the wider GCC. Every valve we supply is specified with the applicable material certification and cleaning specification, giving process and instrumentation teams confidence when the valve is installed into a certified sample system or analyzer loop.
Operating Principle
The SS-1RS4 uses an integral bonnet design, meaning the valve body and bonnet are machined from a single piece of bar stock rather than assembled from separate components joined by a seal, which eliminates a potential leak path found in screwed-bonnet or union-bonnet valve designs. Flow is controlled by a regulating-stem needle that advances into a matched orifice as the handle is turned, giving the operator fine, repeatable control over flow rate rather than the abrupt open/closed behavior of a ball or gate valve, which is exactly what a Swagelok SS-1RS4-equipped sample conditioning system or calibration gas panel needs when a precise, stable flow is required.
A live-loaded packing system maintains constant compressive load on the stem seal as the packing wears or as temperature cycling causes minor dimensional changes, which is what allows the Swagelok SS-1RS4 to be cycled thousands of times in a sampling or control application without developing a stem leak. Because there is no separate bonnet gasket or seal ring in the primary pressure boundary, the Swagelok SS-1RS4 is well suited to hazardous, toxic, or high-value process media where an external leak point is simply not acceptable.
Engineering Design of the Swagelok SS-1RS4
The Swagelok SS-1RS4 body and bonnet are machined from 316 stainless steel bar stock, giving the valve broad chemical compatibility and the corrosion resistance needed for both onshore process plant and coastal GCC installations exposed to humid, saline air. The valve terminates in 1/4 in Swagelok tube fittings on both ports, allowing it to be installed directly into a Swagelok tube fitting system without adapters, and the regulating stem trim is specifically profiled for fine flow adjustment rather than tight shutoff precision, which is the correct trim selection for metering and throttling duty as opposed to bubble-tight isolation.
The valve is rated across a temperature range of -65°F to 600°F (-53°C to 315°C) and a pressure range up to 6,000 psig depending on configuration, and it is available with alternative stem types including vee-stem for closer-to-shutoff throttling and soft-seat trim where bubble-tight sealing is required. Standard cleaning (SC-10) is applied to the Swagelok SS-1RS4 as shipped, with special cleaning (SC-11) available for oxygen, semiconductor, or other high-purity service on request.
Key Features
The Swagelok SS-1RS4 integral-bonnet needle valve delivers the following characteristics to instrumentation and process engineers:
- Integral bonnet construction machined from a single piece of 316 stainless steel bar stock, eliminating a bonnet-to-body leak path.
- Live-loaded packing system that maintains stem seal integrity through repeated cycling and temperature variation.
- 0.37 Cv regulating-stem trim for fine, repeatable flow adjustment on sampling and calibration systems.
- 1/4 in Swagelok tube fitting end connections for direct installation into an existing tube fitting network.
- Pressure rating to 6,000 psig and temperature rating from -65°F to 600°F across the design envelope.
- Alternative vee-stem and soft-seat trims available for closer-to-shutoff or bubble-tight sealing needs.
- Standard SC-10 cleaning with SC-11 special cleaning available for oxygen and high-purity service.
- Compact straight-pattern body suitable for dense panel-mounted instrumentation layouts.
Industrial Applications
The Swagelok SS-1RS4 is specified throughout analyzer sample systems, gas and liquid chromatograph sample conditioning skids, calibration gas panels, and instrumentation tubing runs on oil and gas production facilities, refineries, and petrochemical plants across the region. Its fine flow control and leak-tight integral bonnet design make it the standard choice wherever an instrumentation technician needs to throttle a small process or utility flow precisely without introducing a bonnet seal that could leak hazardous or high-value sample fluid to atmosphere.
In Oman and the GCC, Seven Star LLC supplies Swagelok SS-1RS4 needle valves to instrumentation contractors, EPC firms, and plant maintenance departments across Muscat, the Sohar refining and petrochemical complex, and the Salalah free zone, supporting both new sample system fabrication and spares replacement on existing analyzer houses. Contact Seven Star LLC for a quotation and current lead time for the Swagelok SS-1RS4 Integral Bonnet Needle Valve.
Technical Specifications
Representative specifications for the Swagelok SS-1RS4 integral-bonnet needle valve are summarized below; alternative stem types, cleaning levels, and end connections are available within the O, 1, 18, 20, 26, and D series.
| Parameter | Specification |
|---|---|
| Model | Swagelok SS-1RS4 Integral Bonnet Needle Valve |
| Body/Bonnet Material | 316 stainless steel, integral bar-stock construction |
| End Connections | 1/4 in Swagelok tube fitting (both ports) |
| Flow Coefficient (Cv) | 0.37 |
| Stem Type | Regulating stem (vee-stem and soft-seat also available) |
| Pressure Rating | Up to 6,000 psig, configuration dependent |
| Temperature Rating | -65°F to 600°F (-53°C to 315°C) |
| Cleaning | SC-10 standard; SC-11 special cleaning available |
| Typical Applications | Analyzer sample systems, calibration panels, instrumentation tubing |
Request a Quote for Swagelok SS-1RS4
Seven Star LLC supplies the Swagelok SS-1RS4 needle valve and the wider O, 1, 18, 20, 26, and D series on request, and supports formal RFQs, sample system bill-of-material quotations, and urgent spares enquiries for customers in Oman. Contact our instrumentation division for the current SS-1RS4 specification sheet, stem-type selection assistance, or a quotation against a specific cleaning and end-connection requirement. In Oman and the GCC, Seven Star LLC supplies the SS-1RS4 needle valve on request, with material certification requirements and lead time confirmed at quotation.
Browse the full Swagelok range or see more Fittings & Valves products supplied by Seven Star LLC in Oman and the GCC.
Swagelok product families listed here
The items on this page cover the small-bore components an instrument technician handles most often. Swagelok tube fittings join metric and fractional tubing without threading or welding. Swagelok ball valves are represented by the 40 series, the 40G series one-piece instrumentation ball valve (for example SS-43GS4) and the three-way pattern listed as 40GX. The SS-1RS4 is an integral bonnet needle valve from the 1 series. VCR metal gasket face seal fittings serve high-purity and vacuum lines, QC series quick-connects are used where lines are coupled and uncoupled often, and the KPR series is a pressure-reducing regulator.Where Swagelok components are used
Typical duties are transmitter hook-ups, manifolds and impulse tubing, analyzer shelters and sample conditioning panels, chemical injection skids, gas cylinder panels in laboratories, and test benches. In oil and gas service across the GCC, the usual questions are material grade, pressure rating at temperature and, for sour service, whether the manufacturer offers the item to NACE MR0175 requirements.Ordering Swagelok fittings and valves: what we need
A Swagelok ordering number carries most of the specification. In SS-43GS4, SS is 316 stainless steel, 43G identifies the valve series and size, and S4 is a 1/4 in. Swagelok tube fitting end connection. Send the complete ordering number including any suffix for handle, seat or cleaning option. If you do not have it, give us the tube outside diameter and wall thickness, body material, end connections on each port, working pressure and temperature, and the fluid. For a KPR regulator we also need inlet pressure, the outlet control range and the port configuration.Browse Swagelok products by category: Pipes & Fittings, Regulators, Fittings & Valves.
Reviews
There are no reviews yet.