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Brand: Swagelok
Swagelok SS-4CA-3 Adjustable Poppet Check Valve, 3-50 psig
Description
Check valve with a field-adjustable cracking pressure
The Swagelok SS-4CA-3 is a CA series poppet check valve in 316 stainless steel with 1/4 in. Swagelok tube fittings. Unlike the fixed-pressure C series, its cracking pressure is set with an adjusting screw over a range of 3 to 50 psig (0.21 to 3.5 bar), and a locking screw holds the setting. That makes one valve usable where the required back-flow protection differs from line to line or has to be tuned during commissioning.
The CA series is built from an inlet body, an insert and a centre body that contain the poppet and an adjustable spring, with PTFE-coated stainless steel gaskets at the inlet and outlet and a fully contained O-ring seal. Swagelok tests every adjustable valve at a low-pressure and a high-pressure setting before shipment, with a maximum seat leak rate of 1 std cm³/min nitrogen.
Technical specifications
| Parameter | Specification |
|---|---|
| Part number | SS-4CA-3 |
| Series | CA series, adjustable cracking pressure |
| Body material | 316 stainless steel |
| End connections | 1/4 in. Swagelok tube fitting at both ends |
| Cracking pressure range | 3 to 50 psig (0.21 to 3.5 bar) |
| Maximum flow coefficient (Cv) | 0.37 |
| Working pressure | 3000 psig (206 bar) at 100 °F (37 °C) |
| O-ring material | Fluorocarbon FKM (standard) |
| Length | 3.23 in. (82.0 mm) with nuts finger-tight |
| Cleaning and packaging | Standard cleaning and packaging (SC-10) |
Range designators in the CA series
| Designator | Cracking pressure range |
|---|---|
| -3 | 3 to 50 psi (0.21 to 3.5 bar) |
| -50 | 50 to 150 psi (3.5 to 10.4 bar) |
| -150 | 150 to 350 psi (10.4 to 24.2 bar) |
| -350 | 350 to 600 psi (24.2 to 41.4 bar) |
The designator is added to the basic number, so SS-4CA-50 uses a stiffer spring for the 50 to 150 psi range. Swagelok also offers 6 mm and 8 mm metric tube fitting versions, male NPT and VCR end connections, and the compact CPA series in brass or stainless steel. The sizing curves for air and water in the catalog show how the pressure drop changes with flow at each spring rating.
Selection and documents
Choose the spring range so that the cracking pressure sits comfortably above any expected back pressure and below the minimum available inlet pressure. Check valves control direction only and are never a substitute for a code safety relief device. For fixed-pressure service up to 6000 psig see the CH series check valve. The attached Swagelok catalog MS-01-176 includes ratings, flow data and ordering information. For a quotation, give the full part number, end connections and seal material. Related products are listed under Fittings and Valves.
Datasheets & Documents
- Catalog Swagelok check valves C, CA, CH, CP and CPA series catalog MS-01-176 (EN, rev. N) Download
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About brand
Two-ferrule tube fittings made Swagelok a familiar name on instrument air headers, impulse lines and analyzer sample systems. The company has made fluid system components since 1947 and is based in Solon, USA. Seven Star LLC sources and supplies Swagelok tube fittings, ball valves, needle valves, quick-connects, face seal fittings and pressure regulators for plants in Oman, checking every ordering number against the manufacturer's catalog before an offer is made.
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.
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Frequently Asked Questions
How is the cracking pressure set on the SS-4CA-3?
With an adjusting screw over 3 to 50 psig, held by a locking screw.
What do the other CA designators cover?
-50 covers 50 to 150 psi, -150 covers 150 to 350 psi and -350 covers 350 to 600 psi.
What is the maximum flow coefficient?
Cv is 0.37 according to the Swagelok product data.
What pressure rating applies?
3000 psig (206 bar) at 100 °F (37 °C) for this stainless steel valve.
How is each adjustable valve tested?
Each is tested at a low and a high pressure setting, with a seat leak limit of 1 std cm3/min nitrogen.
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